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1387 lines
41 KiB
PHP
1387 lines
41 KiB
PHP
<?php
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/**
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+-------------------------------------------------------------------------+
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| Engine of the Enigma Plugin |
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| Copyright (C) 2010-2016 The Roundcube Dev Team |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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+-------------------------------------------------------------------------+
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-------------------------------------------------------------------------+
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*/
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/**
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* Enigma plugin engine.
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*
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* RFC2440: OpenPGP Message Format
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* RFC3156: MIME Security with OpenPGP
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* RFC3851: S/MIME
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*/
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class enigma_engine
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{
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private $rc;
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private $enigma;
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private $pgp_driver;
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private $smime_driver;
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private $password_time;
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public $decryptions = array();
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public $signatures = array();
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public $encrypted_parts = array();
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const ENCRYPTED_PARTIALLY = 100;
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const SIGN_MODE_BODY = 1;
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const SIGN_MODE_SEPARATE = 2;
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const SIGN_MODE_MIME = 4;
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const ENCRYPT_MODE_BODY = 1;
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const ENCRYPT_MODE_MIME = 2;
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const ENCRYPT_MODE_SIGN = 4;
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/**
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* Plugin initialization.
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*/
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function __construct($enigma)
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{
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$this->rc = rcmail::get_instance();
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$this->enigma = $enigma;
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$this->password_time = $this->rc->config->get('enigma_password_time') * 60;
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// this will remove passwords from session after some time
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if ($this->password_time) {
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$this->get_passwords();
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}
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}
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/**
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* PGP driver initialization.
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*/
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function load_pgp_driver()
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{
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if ($this->pgp_driver) {
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return;
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}
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$driver = 'enigma_driver_' . $this->rc->config->get('enigma_pgp_driver', 'gnupg');
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$username = $this->rc->user->get_username();
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// Load driver
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$this->pgp_driver = new $driver($username);
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if (!$this->pgp_driver) {
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rcube::raise_error(array(
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'code' => 600, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Enigma plugin: Unable to load PGP driver: $driver"
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), true, true);
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}
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// Initialise driver
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$result = $this->pgp_driver->init();
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if ($result instanceof enigma_error) {
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self::raise_error($result, __LINE__, true);
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}
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}
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/**
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* S/MIME driver initialization.
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*/
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function load_smime_driver()
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{
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if ($this->smime_driver) {
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return;
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}
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$driver = 'enigma_driver_' . $this->rc->config->get('enigma_smime_driver', 'phpssl');
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$username = $this->rc->user->get_username();
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// Load driver
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$this->smime_driver = new $driver($username);
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if (!$this->smime_driver) {
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rcube::raise_error(array(
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'code' => 600, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => "Enigma plugin: Unable to load S/MIME driver: $driver"
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), true, true);
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}
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// Initialise driver
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$result = $this->smime_driver->init();
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if ($result instanceof enigma_error) {
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self::raise_error($result, __LINE__, true);
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}
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}
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/**
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* Handler for message signing
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*
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* @param Mail_mime Original message
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* @param int Encryption mode
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*
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* @return enigma_error On error returns error object
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*/
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function sign_message(&$message, $mode = null)
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{
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$mime = new enigma_mime_message($message, enigma_mime_message::PGP_SIGNED);
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$from = $mime->getFromAddress();
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// find private key
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$key = $this->find_key($from, true);
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if (empty($key)) {
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return new enigma_error(enigma_error::KEYNOTFOUND);
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}
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// check if we have password for this key
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$passwords = $this->get_passwords();
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$pass = $passwords[$key->id];
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if ($pass === null) {
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// ask for password
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$error = array('missing' => array($key->id => $key->name));
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return new enigma_error(enigma_error::BADPASS, '', $error);
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}
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$key->password = $pass;
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// select mode
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switch ($mode) {
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case self::SIGN_MODE_BODY:
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$pgp_mode = Crypt_GPG::SIGN_MODE_CLEAR;
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break;
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case self::SIGN_MODE_MIME:
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$pgp_mode = Crypt_GPG::SIGN_MODE_DETACHED;
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break;
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default:
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if ($mime->isMultipart()) {
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$pgp_mode = Crypt_GPG::SIGN_MODE_DETACHED;
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}
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else {
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$pgp_mode = Crypt_GPG::SIGN_MODE_CLEAR;
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}
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}
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// get message body
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if ($pgp_mode == Crypt_GPG::SIGN_MODE_CLEAR) {
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// in this mode we'll replace text part
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// with the one containing signature
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$body = $message->getTXTBody();
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$text_charset = $message->getParam('text_charset');
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$line_length = $this->rc->config->get('line_length', 72);
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// We can't use format=flowed for signed messages
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if (strpos($text_charset, 'format=flowed')) {
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list($charset, $params) = explode(';', $text_charset);
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$body = rcube_mime::unfold_flowed($body);
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$body = rcube_mime::wordwrap($body, $line_length, "\r\n", false, $charset);
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$text_charset = str_replace(";\r\n format=flowed", '', $text_charset);
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}
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}
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else {
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// here we'll build PGP/MIME message
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$body = $mime->getOrigBody();
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}
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// sign the body
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$result = $this->pgp_sign($body, $key, $pgp_mode);
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if ($result !== true) {
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if ($result->getCode() == enigma_error::BADPASS) {
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// ask for password
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$error = array('bad' => array($key->id => $key->name));
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return new enigma_error(enigma_error::BADPASS, '', $error);
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}
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return $result;
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}
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// replace message body
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if ($pgp_mode == Crypt_GPG::SIGN_MODE_CLEAR) {
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$message->setTXTBody($body);
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$message->setParam('text_charset', $text_charset);
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}
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else {
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$mime->addPGPSignature($body, $this->pgp_driver->signature_algorithm());
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$message = $mime;
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}
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}
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/**
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* Handler for message encryption
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*
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* @param Mail_mime Original message
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* @param int Encryption mode
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* @param bool Is draft-save action - use only sender's key for encryption
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*
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* @return enigma_error On error returns error object
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*/
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function encrypt_message(&$message, $mode = null, $is_draft = false)
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{
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$mime = new enigma_mime_message($message, enigma_mime_message::PGP_ENCRYPTED);
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// always use sender's key
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$from = $mime->getFromAddress();
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// check senders key for signing
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if ($mode & self::ENCRYPT_MODE_SIGN) {
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$sign_key = $this->find_key($from, true);
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if (empty($sign_key)) {
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return new enigma_error(enigma_error::KEYNOTFOUND);
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}
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// check if we have password for this key
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$passwords = $this->get_passwords();
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$sign_pass = $passwords[$sign_key->id];
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if ($sign_pass === null) {
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// ask for password
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$error = array('missing' => array($sign_key->id => $sign_key->name));
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return new enigma_error(enigma_error::BADPASS, '', $error);
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}
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$sign_key->password = $sign_pass;
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}
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$recipients = array($from);
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// if it's not a draft we add all recipients' keys
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if (!$is_draft) {
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$recipients = array_merge($recipients, $mime->getRecipients());
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}
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if (empty($recipients)) {
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return new enigma_error(enigma_error::KEYNOTFOUND);
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}
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$recipients = array_unique($recipients);
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// find recipient public keys
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foreach ((array) $recipients as $email) {
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if ($email == $from && $sign_key) {
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$key = $sign_key;
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}
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else {
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$key = $this->find_key($email);
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}
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if (empty($key)) {
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return new enigma_error(enigma_error::KEYNOTFOUND, '', array(
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'missing' => $email
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));
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}
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$keys[] = $key;
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}
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// select mode
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if ($mode & self::ENCRYPT_MODE_BODY) {
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$encrypt_mode = $mode;
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}
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else if ($mode & self::ENCRYPT_MODE_MIME) {
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$encrypt_mode = $mode;
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}
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else {
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$encrypt_mode = $mime->isMultipart() ? self::ENCRYPT_MODE_MIME : self::ENCRYPT_MODE_BODY;
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}
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// get message body
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if ($encrypt_mode == self::ENCRYPT_MODE_BODY) {
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// in this mode we'll replace text part
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// with the one containing encrypted message
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$body = $message->getTXTBody();
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}
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else {
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// here we'll build PGP/MIME message
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$body = $mime->getOrigBody();
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}
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// sign the body
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$result = $this->pgp_encrypt($body, $keys, $sign_key);
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if ($result !== true) {
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if ($result->getCode() == enigma_error::BADPASS) {
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// ask for password
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$error = array('bad' => array($sign_key->id => $sign_key->name));
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return new enigma_error(enigma_error::BADPASS, '', $error);
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}
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return $result;
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}
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// replace message body
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if ($encrypt_mode == self::ENCRYPT_MODE_BODY) {
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$message->setTXTBody($body);
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}
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else {
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$mime->setPGPEncryptedBody($body);
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$message = $mime;
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}
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}
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/**
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* Handler for attaching public key to a message
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*
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* @param Mail_mime Original message
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*
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* @return bool True on success, False on failure
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*/
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function attach_public_key(&$message)
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{
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$headers = $message->headers();
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$from = rcube_mime::decode_address_list($headers['From'], 1, false, null, true);
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$from = $from[1];
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// find my key
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if ($from && ($key = $this->find_key($from))) {
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$pubkey_armor = $this->export_key($key->id);
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if (!$pubkey_armor instanceof enigma_error) {
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$pubkey_name = '0x' . enigma_key::format_id($key->id) . '.asc';
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$message->addAttachment($pubkey_armor, 'application/pgp-keys', $pubkey_name, false, '7bit');
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return true;
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}
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}
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return false;
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}
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/**
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* Handler for message_part_structure hook.
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* Called for every part of the message.
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*
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* @param array Original parameters
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* @param string Part body (will be set if used internally)
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*
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* @return array Modified parameters
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*/
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function part_structure($p, $body = null)
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{
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if ($p['mimetype'] == 'text/plain' || $p['mimetype'] == 'application/pgp') {
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$this->parse_plain($p, $body);
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}
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else if ($p['mimetype'] == 'multipart/signed') {
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$this->parse_signed($p, $body);
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}
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else if ($p['mimetype'] == 'multipart/encrypted') {
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$this->parse_encrypted($p);
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}
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else if ($p['mimetype'] == 'application/pkcs7-mime') {
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$this->parse_encrypted($p);
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}
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return $p;
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}
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/**
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* Handler for message_part_body hook.
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*
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* @param array Original parameters
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*
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* @return array Modified parameters
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*/
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function part_body($p)
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{
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// encrypted attachment, see parse_plain_encrypted()
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if ($p['part']->need_decryption && $p['part']->body === null) {
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$this->load_pgp_driver();
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$storage = $this->rc->get_storage();
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$body = $storage->get_message_part($p['object']->uid, $p['part']->mime_id, $p['part'], null, null, true, 0, false);
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$result = $this->pgp_decrypt($body);
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// @TODO: what to do on error?
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if ($result === true) {
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$p['part']->body = $body;
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$p['part']->size = strlen($body);
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$p['part']->body_modified = true;
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}
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}
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return $p;
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}
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/**
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* Handler for plain/text message.
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*
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* @param array Reference to hook's parameters
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* @param string Part body (will be set if used internally)
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*/
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function parse_plain(&$p, $body = null)
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{
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$part = $p['structure'];
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// Get message body from IMAP server
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if ($body === null) {
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$body = $this->get_part_body($p['object'], $part);
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}
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// In this way we can use fgets on string as on file handle
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// Don't use php://temp for security (body may come from an encrypted part)
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$fd = fopen('php://memory', 'r+');
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if (!$fd) {
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return;
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}
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fwrite($fd, $body);
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rewind($fd);
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$body = '';
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$prefix = '';
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$mode = '';
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$tokens = array(
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'BEGIN PGP SIGNED MESSAGE' => 'signed-start',
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'END PGP SIGNATURE' => 'signed-end',
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'BEGIN PGP MESSAGE' => 'encrypted-start',
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'END PGP MESSAGE' => 'encrypted-end',
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);
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$regexp = '/^-----(' . implode('|', array_keys($tokens)) . ')-----[\r\n]*/';
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|
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while (($line = fgets($fd)) !== false) {
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if ($line[0] === '-' && $line[4] === '-' && preg_match($regexp, $line, $m)) {
|
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switch ($tokens[$m[1]]) {
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case 'signed-start':
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$body = $line;
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$mode = 'signed';
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break;
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case 'signed-end':
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if ($mode === 'signed') {
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$body .= $line;
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}
|
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break 2; // ignore anything after this line
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case 'encrypted-start':
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$body = $line;
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$mode = 'encrypted';
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break;
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|
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case 'encrypted-end':
|
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if ($mode === 'encrypted') {
|
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$body .= $line;
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}
|
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break 2; // ignore anything after this line
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}
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continue;
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}
|
|
|
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if ($mode === 'signed') {
|
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$body .= $line;
|
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}
|
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else if ($mode === 'encrypted') {
|
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$body .= $line;
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}
|
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else {
|
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$prefix .= $line;
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}
|
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}
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|
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fclose($fd);
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if ($mode === 'signed') {
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$this->parse_plain_signed($p, $body, $prefix);
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}
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else if ($mode === 'encrypted') {
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$this->parse_plain_encrypted($p, $body, $prefix);
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}
|
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}
|
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|
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/**
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* Handler for multipart/signed message.
|
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*
|
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* @param array Reference to hook's parameters
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* @param string Part body (will be set if used internally)
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*/
|
|
function parse_signed(&$p, $body = null)
|
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{
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$struct = $p['structure'];
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// S/MIME
|
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if ($struct->parts[1] && $struct->parts[1]->mimetype == 'application/pkcs7-signature') {
|
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$this->parse_smime_signed($p, $body);
|
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}
|
|
// PGP/MIME: RFC3156
|
|
// The multipart/signed body MUST consist of exactly two parts.
|
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// The first part contains the signed data in MIME canonical format,
|
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// including a set of appropriate content headers describing the data.
|
|
// The second body MUST contain the PGP digital signature. It MUST be
|
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// labeled with a content type of "application/pgp-signature".
|
|
else if (count($struct->parts) == 2
|
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&& $struct->parts[1] && $struct->parts[1]->mimetype == 'application/pgp-signature'
|
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) {
|
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$this->parse_pgp_signed($p, $body);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for multipart/encrypted message.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
*/
|
|
function parse_encrypted(&$p)
|
|
{
|
|
$struct = $p['structure'];
|
|
|
|
// S/MIME
|
|
if ($p['mimetype'] == 'application/pkcs7-mime') {
|
|
$this->parse_smime_encrypted($p);
|
|
}
|
|
// PGP/MIME: RFC3156
|
|
// The multipart/encrypted MUST consist of exactly two parts. The first
|
|
// MIME body part must have a content type of "application/pgp-encrypted".
|
|
// This body contains the control information.
|
|
// The second MIME body part MUST contain the actual encrypted data. It
|
|
// must be labeled with a content type of "application/octet-stream".
|
|
else if (count($struct->parts) == 2
|
|
&& $struct->parts[0] && $struct->parts[0]->mimetype == 'application/pgp-encrypted'
|
|
&& $struct->parts[1] && $struct->parts[1]->mimetype == 'application/octet-stream'
|
|
) {
|
|
$this->parse_pgp_encrypted($p);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for plain signed message.
|
|
* Excludes message and signature bodies and verifies signature.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
* @param string Message (part) body
|
|
* @param string Body prefix (additional text before the encrypted block)
|
|
*/
|
|
private function parse_plain_signed(&$p, $body, $prefix = '')
|
|
{
|
|
if (!$this->rc->config->get('enigma_signatures', true)) {
|
|
return;
|
|
}
|
|
|
|
$this->load_pgp_driver();
|
|
$part = $p['structure'];
|
|
|
|
// Verify signature
|
|
if ($this->rc->action == 'show' || $this->rc->action == 'preview' || $this->rc->action == 'print') {
|
|
$sig = $this->pgp_verify($body);
|
|
}
|
|
|
|
// In this way we can use fgets on string as on file handle
|
|
// Don't use php://temp for security (body may come from an encrypted part)
|
|
$fd = fopen('php://memory', 'r+');
|
|
if (!$fd) {
|
|
return;
|
|
}
|
|
|
|
fwrite($fd, $body);
|
|
rewind($fd);
|
|
|
|
$body = $part->body = null;
|
|
$part->body_modified = true;
|
|
|
|
// Extract body (and signature?)
|
|
while (($line = fgets($fd, 1024)) !== false) {
|
|
if ($part->body === null)
|
|
$part->body = '';
|
|
else if (preg_match('/^-----BEGIN PGP SIGNATURE-----/', $line))
|
|
break;
|
|
else
|
|
$part->body .= $line;
|
|
}
|
|
|
|
fclose($fd);
|
|
|
|
// Remove "Hash" Armor Headers
|
|
$part->body = preg_replace('/^.*\r*\n\r*\n/', '', $part->body);
|
|
// de-Dash-Escape (RFC2440)
|
|
$part->body = preg_replace('/(^|\n)- -/', '\\1-', $part->body);
|
|
|
|
if ($prefix) {
|
|
$part->body = $prefix . $part->body;
|
|
}
|
|
|
|
// Store signature data for display
|
|
if (!empty($sig)) {
|
|
$sig->partial = !empty($prefix);
|
|
$this->signatures[$part->mime_id] = $sig;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for PGP/MIME signed message.
|
|
* Verifies signature.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
* @param string Part body (will be set if used internally)
|
|
*/
|
|
private function parse_pgp_signed(&$p, $body = null)
|
|
{
|
|
if (!$this->rc->config->get('enigma_signatures', true)) {
|
|
return;
|
|
}
|
|
|
|
if ($this->rc->action != 'show' && $this->rc->action != 'preview' && $this->rc->action != 'print') {
|
|
return;
|
|
}
|
|
|
|
$this->load_pgp_driver();
|
|
$struct = $p['structure'];
|
|
|
|
$msg_part = $struct->parts[0];
|
|
$sig_part = $struct->parts[1];
|
|
|
|
// Get bodies
|
|
if ($body === null) {
|
|
if (!$struct->body_modified) {
|
|
$body = $this->get_part_body($p['object'], $struct);
|
|
}
|
|
}
|
|
|
|
$boundary = $struct->ctype_parameters['boundary'];
|
|
|
|
// when it is a signed message forwarded as attachment
|
|
// ctype_parameters property will not be set
|
|
if (!$boundary && $struct->headers['content-type']
|
|
&& preg_match('/boundary="?([a-zA-Z0-9\'()+_,-.\/:=?]+)"?/', $struct->headers['content-type'], $m)
|
|
) {
|
|
$boundary = $m[1];
|
|
}
|
|
|
|
// set signed part body
|
|
list($msg_body, $sig_body) = $this->explode_signed_body($body, $boundary);
|
|
|
|
// Verify
|
|
if ($sig_body && $msg_body) {
|
|
$sig = $this->pgp_verify($msg_body, $sig_body);
|
|
|
|
// Store signature data for display
|
|
$this->signatures[$struct->mime_id] = $sig;
|
|
$this->signatures[$msg_part->mime_id] = $sig;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for S/MIME signed message.
|
|
* Verifies signature.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
* @param string Part body (will be set if used internally)
|
|
*/
|
|
private function parse_smime_signed(&$p, $body = null)
|
|
{
|
|
if (!$this->rc->config->get('enigma_signatures', true)) {
|
|
return;
|
|
}
|
|
|
|
// @TODO
|
|
}
|
|
|
|
/**
|
|
* Handler for plain encrypted message.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
* @param string Message (part) body
|
|
* @param string Body prefix (additional text before the encrypted block)
|
|
*/
|
|
private function parse_plain_encrypted(&$p, $body, $prefix = '')
|
|
{
|
|
if (!$this->rc->config->get('enigma_decryption', true)) {
|
|
return;
|
|
}
|
|
|
|
$this->load_pgp_driver();
|
|
$part = $p['structure'];
|
|
|
|
// Decrypt
|
|
$result = $this->pgp_decrypt($body, $signature);
|
|
|
|
// Store decryption status
|
|
$this->decryptions[$part->mime_id] = $result;
|
|
|
|
// Store signature data for display
|
|
if ($signature) {
|
|
$this->signatures[$part->mime_id] = $signature;
|
|
}
|
|
|
|
// find parent part ID
|
|
if (strpos($part->mime_id, '.')) {
|
|
$items = explode('.', $part->mime_id);
|
|
array_pop($items);
|
|
$parent = implode('.', $items);
|
|
}
|
|
else {
|
|
$parent = 0;
|
|
}
|
|
|
|
// Parse decrypted message
|
|
if ($result === true) {
|
|
$part->body = $prefix . $body;
|
|
$part->body_modified = true;
|
|
|
|
// it maybe PGP signed inside, verify signature
|
|
$this->parse_plain($p, $body);
|
|
|
|
// Remember it was decrypted
|
|
$this->encrypted_parts[] = $part->mime_id;
|
|
|
|
// Inform the user that only a part of the body was encrypted
|
|
if ($prefix) {
|
|
$this->decryptions[$part->mime_id] = self::ENCRYPTED_PARTIALLY;
|
|
}
|
|
|
|
// Encrypted plain message may contain encrypted attachments
|
|
// in such case attachments have .pgp extension and type application/octet-stream.
|
|
// This is what happens when you select "Encrypt each attachment separately
|
|
// and send the message using inline PGP" in Thunderbird's Enigmail.
|
|
|
|
if ($p['object']->mime_parts[$parent]) {
|
|
foreach ((array)$p['object']->mime_parts[$parent]->parts as $p) {
|
|
if ($p->disposition == 'attachment' && $p->mimetype == 'application/octet-stream'
|
|
&& preg_match('/^(.*)\.pgp$/i', $p->filename, $m)
|
|
) {
|
|
// modify filename
|
|
$p->filename = $m[1];
|
|
// flag the part, it will be decrypted when needed
|
|
$p->need_decryption = true;
|
|
// disable caching
|
|
$p->body_modified = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// decryption failed, but the message may have already
|
|
// been cached with the modified parts (see above),
|
|
// let's bring the original state back
|
|
else if ($p['object']->mime_parts[$parent]) {
|
|
foreach ((array)$p['object']->mime_parts[$parent]->parts as $p) {
|
|
if ($p->need_decryption && !preg_match('/^(.*)\.pgp$/i', $p->filename, $m)) {
|
|
// modify filename
|
|
$p->filename .= '.pgp';
|
|
// flag the part, it will be decrypted when needed
|
|
unset($p->need_decryption);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for PGP/MIME encrypted message.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
*/
|
|
private function parse_pgp_encrypted(&$p)
|
|
{
|
|
if (!$this->rc->config->get('enigma_decryption', true)) {
|
|
return;
|
|
}
|
|
|
|
$this->load_pgp_driver();
|
|
|
|
$struct = $p['structure'];
|
|
$part = $struct->parts[1];
|
|
|
|
// Get body
|
|
$body = $this->get_part_body($p['object'], $part);
|
|
|
|
// Decrypt
|
|
$result = $this->pgp_decrypt($body, $signature);
|
|
|
|
if ($result === true) {
|
|
// Parse decrypted message
|
|
$struct = $this->parse_body($body);
|
|
|
|
// Modify original message structure
|
|
$this->modify_structure($p, $struct, strlen($body));
|
|
|
|
// Parse the structure (there may be encrypted/signed parts inside
|
|
$this->part_structure(array(
|
|
'object' => $p['object'],
|
|
'structure' => $struct,
|
|
'mimetype' => $struct->mimetype
|
|
), $body);
|
|
|
|
// Attach the decryption message to all parts
|
|
$this->decryptions[$struct->mime_id] = $result;
|
|
foreach ((array) $struct->parts as $sp) {
|
|
$this->decryptions[$sp->mime_id] = $result;
|
|
if ($signature) {
|
|
$this->signatures[$sp->mime_id] = $signature;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
$this->decryptions[$part->mime_id] = $result;
|
|
|
|
// Make sure decryption status message will be displayed
|
|
$part->type = 'content';
|
|
$p['object']->parts[] = $part;
|
|
|
|
// don't show encrypted part on attachments list
|
|
// don't show "cannot display encrypted message" text
|
|
$p['abort'] = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for S/MIME encrypted message.
|
|
*
|
|
* @param array Reference to hook's parameters
|
|
*/
|
|
private function parse_smime_encrypted(&$p)
|
|
{
|
|
if (!$this->rc->config->get('enigma_decryption', true)) {
|
|
return;
|
|
}
|
|
|
|
// @TODO
|
|
}
|
|
|
|
/**
|
|
* PGP signature verification.
|
|
*
|
|
* @param mixed Message body
|
|
* @param mixed Signature body (for MIME messages)
|
|
*
|
|
* @return mixed enigma_signature or enigma_error
|
|
*/
|
|
private function pgp_verify(&$msg_body, $sig_body = null)
|
|
{
|
|
// @TODO: Handle big bodies using (temp) files
|
|
$sig = $this->pgp_driver->verify($msg_body, $sig_body);
|
|
|
|
if (($sig instanceof enigma_error) && $sig->getCode() != enigma_error::KEYNOTFOUND) {
|
|
self::raise_error($sig, __LINE__);
|
|
}
|
|
|
|
return $sig;
|
|
}
|
|
|
|
/**
|
|
* PGP message decryption.
|
|
*
|
|
* @param mixed &$msg_body Message body
|
|
* @param enigma_signature &$signature Signature verification result
|
|
*
|
|
* @return mixed True or enigma_error
|
|
*/
|
|
private function pgp_decrypt(&$msg_body, &$signature = null)
|
|
{
|
|
// @TODO: Handle big bodies using (temp) files
|
|
$keys = $this->get_passwords();
|
|
$result = $this->pgp_driver->decrypt($msg_body, $keys, $signature);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
if ($result->getCode() != enigma_error::KEYNOTFOUND) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
$msg_body = $result;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* PGP message signing
|
|
*
|
|
* @param mixed Message body
|
|
* @param enigma_key The key (with passphrase)
|
|
* @param int Signing mode
|
|
*
|
|
* @return mixed True or enigma_error
|
|
*/
|
|
private function pgp_sign(&$msg_body, $key, $mode = null)
|
|
{
|
|
// @TODO: Handle big bodies using (temp) files
|
|
$result = $this->pgp_driver->sign($msg_body, $key, $mode);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
if ($result->getCode() != enigma_error::KEYNOTFOUND) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
$msg_body = $result;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* PGP message encrypting
|
|
*
|
|
* @param mixed Message body
|
|
* @param array Keys (array of enigma_key objects)
|
|
* @param string Optional signing Key ID
|
|
* @param string Optional signing Key password
|
|
*
|
|
* @return mixed True or enigma_error
|
|
*/
|
|
private function pgp_encrypt(&$msg_body, $keys, $sign_key = null, $sign_pass = null)
|
|
{
|
|
// @TODO: Handle big bodies using (temp) files
|
|
$result = $this->pgp_driver->encrypt($msg_body, $keys, $sign_key, $sign_pass);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
if ($result->getCode() != enigma_error::KEYNOTFOUND) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
$msg_body = $result;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* PGP keys listing.
|
|
*
|
|
* @param mixed Key ID/Name pattern
|
|
*
|
|
* @return mixed Array of keys or enigma_error
|
|
*/
|
|
function list_keys($pattern = '')
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->list_keys($pattern);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Find PGP private/public key
|
|
*
|
|
* @param string E-mail address
|
|
* @param bool Need a key for signing?
|
|
*
|
|
* @return enigma_key The key
|
|
*/
|
|
function find_key($email, $can_sign = false)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->list_keys($email);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
return;
|
|
}
|
|
|
|
$mode = $can_sign ? enigma_key::CAN_SIGN : enigma_key::CAN_ENCRYPT;
|
|
|
|
// check key validity and type
|
|
foreach ($result as $key) {
|
|
if ($subkey = $key->find_subkey($email, $mode)) {
|
|
return $key;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* PGP key details.
|
|
*
|
|
* @param mixed Key ID
|
|
*
|
|
* @return mixed enigma_key or enigma_error
|
|
*/
|
|
function get_key($keyid)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->get_key($keyid);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* PGP key delete.
|
|
*
|
|
* @param string Key ID
|
|
*
|
|
* @return enigma_error|bool True on success
|
|
*/
|
|
function delete_key($keyid)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->delete_key($keyid);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* PGP keys pair generation.
|
|
*
|
|
* @param array Key pair parameters
|
|
*
|
|
* @return mixed enigma_key or enigma_error
|
|
*/
|
|
function generate_key($data)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->gen_key($data);
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* PGP keys/certs import.
|
|
*
|
|
* @param mixed Import file name or content
|
|
* @param boolean True if first argument is a filename
|
|
*
|
|
* @return mixed Import status data array or enigma_error
|
|
*/
|
|
function import_key($content, $isfile = false)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->import($content, $isfile, $this->get_passwords());
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
}
|
|
else {
|
|
$result['imported'] = $result['public_imported'] + $result['private_imported'];
|
|
$result['unchanged'] = $result['public_unchanged'] + $result['private_unchanged'];
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* PGP keys/certs export.
|
|
*
|
|
* @param string Key ID
|
|
* @param resource Optional output stream
|
|
* @param bool Include private key
|
|
*
|
|
* @return mixed Key content or enigma_error
|
|
*/
|
|
function export_key($key, $fp = null, $include_private = false)
|
|
{
|
|
$this->load_pgp_driver();
|
|
$result = $this->pgp_driver->export($key, $include_private, $this->get_passwords());
|
|
|
|
if ($result instanceof enigma_error) {
|
|
self::raise_error($result, __LINE__);
|
|
return $result;
|
|
}
|
|
|
|
if ($fp) {
|
|
fwrite($fp, $result);
|
|
}
|
|
else {
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Registers password for specified key/cert sent by the password prompt.
|
|
*/
|
|
function password_handler()
|
|
{
|
|
$keyid = rcube_utils::get_input_value('_keyid', rcube_utils::INPUT_POST);
|
|
$passwd = rcube_utils::get_input_value('_passwd', rcube_utils::INPUT_POST, true);
|
|
|
|
if ($keyid && $passwd !== null && strlen($passwd)) {
|
|
$this->save_password(strtoupper($keyid), $passwd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Saves key/cert password in user session
|
|
*/
|
|
function save_password($keyid, $password)
|
|
{
|
|
// we store passwords in session for specified time
|
|
if ($config = $_SESSION['enigma_pass']) {
|
|
$config = $this->rc->decrypt($config);
|
|
$config = @unserialize($config);
|
|
}
|
|
|
|
$config[$keyid] = array($password, time());
|
|
|
|
$_SESSION['enigma_pass'] = $this->rc->encrypt(serialize($config));
|
|
}
|
|
|
|
/**
|
|
* Returns currently stored passwords
|
|
*/
|
|
function get_passwords()
|
|
{
|
|
if ($config = $_SESSION['enigma_pass']) {
|
|
$config = $this->rc->decrypt($config);
|
|
$config = @unserialize($config);
|
|
}
|
|
|
|
$threshold = $this->password_time ? time() - $this->password_time : 0;
|
|
$keys = array();
|
|
|
|
// delete expired passwords
|
|
foreach ((array) $config as $key => $value) {
|
|
if ($threshold && $value[1] < $threshold) {
|
|
unset($config[$key]);
|
|
$modified = true;
|
|
}
|
|
else {
|
|
$keys[$key] = $value[0];
|
|
}
|
|
}
|
|
|
|
if ($modified) {
|
|
$_SESSION['enigma_pass'] = $this->rc->encrypt(serialize($config));
|
|
}
|
|
|
|
return $keys;
|
|
}
|
|
|
|
/**
|
|
* Get message part body.
|
|
*
|
|
* @param rcube_message Message object
|
|
* @param rcube_message_part Message part
|
|
*/
|
|
private function get_part_body($msg, $part)
|
|
{
|
|
// @TODO: Handle big bodies using file handles
|
|
|
|
// This is a special case when we want to get the whole body
|
|
// using direct IMAP access, in other cases we prefer
|
|
// rcube_message::get_part_body() as the body may be already in memory
|
|
if (!$part->mime_id) {
|
|
// fake the size which may be empty for multipart/* parts
|
|
// otherwise get_message_part() below will fail
|
|
if (!$part->size) {
|
|
$reset = true;
|
|
$part->size = 1;
|
|
}
|
|
|
|
$storage = $this->rc->get_storage();
|
|
$body = $storage->get_message_part($msg->uid, $part->mime_id, $part,
|
|
null, null, true, 0, false);
|
|
|
|
if ($reset) {
|
|
$part->size = 0;
|
|
}
|
|
}
|
|
else {
|
|
$body = $msg->get_part_body($part->mime_id, false);
|
|
}
|
|
|
|
return $body;
|
|
}
|
|
|
|
/**
|
|
* Parse decrypted message body into structure
|
|
*
|
|
* @param string Message body
|
|
*
|
|
* @return array Message structure
|
|
*/
|
|
private function parse_body(&$body)
|
|
{
|
|
// Mail_mimeDecode need \r\n end-line, but gpg may return \n
|
|
$body = preg_replace('/\r?\n/', "\r\n", $body);
|
|
|
|
// parse the body into structure
|
|
$struct = rcube_mime::parse_message($body);
|
|
|
|
return $struct;
|
|
}
|
|
|
|
/**
|
|
* Replace message encrypted structure with decrypted message structure
|
|
*
|
|
* @param array Hook arguments
|
|
* @param rcube_message_part Part structure
|
|
* @param int Part size
|
|
*/
|
|
private function modify_structure(&$p, $struct, $size = 0)
|
|
{
|
|
// modify mime_parts property of the message object
|
|
$old_id = $p['structure']->mime_id;
|
|
|
|
foreach (array_keys($p['object']->mime_parts) as $idx) {
|
|
if (!$old_id || $idx == $old_id || strpos($idx, $old_id . '.') === 0) {
|
|
unset($p['object']->mime_parts[$idx]);
|
|
}
|
|
}
|
|
|
|
// set some part params used by Roundcube core
|
|
$struct->headers = array_merge($p['structure']->headers, $struct->headers);
|
|
$struct->size = $size;
|
|
$struct->filename = $p['structure']->filename;
|
|
|
|
// modify the new structure to be correctly handled by Roundcube
|
|
$this->modify_structure_part($struct, $p['object'], $old_id);
|
|
|
|
// replace old structure with the new one
|
|
$p['structure'] = $struct;
|
|
$p['mimetype'] = $struct->mimetype;
|
|
}
|
|
|
|
/**
|
|
* Modify decrypted message part
|
|
*
|
|
* @param rcube_message_part
|
|
* @param rcube_message
|
|
*/
|
|
private function modify_structure_part($part, $msg, $old_id)
|
|
{
|
|
// never cache the body
|
|
$part->body_modified = true;
|
|
$part->encoding = 'stream';
|
|
|
|
// modify part identifier
|
|
if ($old_id) {
|
|
$part->mime_id = !$part->mime_id ? $old_id : ($old_id . '.' . $part->mime_id);
|
|
}
|
|
|
|
// Cache the fact it was decrypted
|
|
$this->encrypted_parts[] = $part->mime_id;
|
|
$msg->mime_parts[$part->mime_id] = $part;
|
|
|
|
// modify sub-parts
|
|
foreach ((array) $part->parts as $p) {
|
|
$this->modify_structure_part($p, $msg, $old_id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Extracts body and signature of multipart/signed message body
|
|
*/
|
|
private function explode_signed_body($body, $boundary)
|
|
{
|
|
if (!$body) {
|
|
return array();
|
|
}
|
|
|
|
$boundary = '--' . $boundary;
|
|
$boundary_len = strlen($boundary) + 2;
|
|
|
|
// Find boundaries
|
|
$start = strpos($body, $boundary) + $boundary_len;
|
|
$end = strpos($body, $boundary, $start);
|
|
|
|
// Get signed body and signature
|
|
$sig = substr($body, $end + $boundary_len);
|
|
$body = substr($body, $start, $end - $start - 2);
|
|
|
|
// Cleanup signature
|
|
$sig = substr($sig, strpos($sig, "\r\n\r\n") + 4);
|
|
$sig = substr($sig, 0, strpos($sig, $boundary));
|
|
|
|
return array($body, $sig);
|
|
}
|
|
|
|
/**
|
|
* Checks if specified message part is a PGP-key or S/MIME cert data
|
|
*
|
|
* @param rcube_message_part Part object
|
|
*
|
|
* @return boolean True if part is a key/cert
|
|
*/
|
|
public function is_keys_part($part)
|
|
{
|
|
// @TODO: S/MIME
|
|
return (
|
|
// Content-Type: application/pgp-keys
|
|
$part->mimetype == 'application/pgp-keys'
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Removes all user keys and assigned data
|
|
*
|
|
* @param string Username
|
|
*
|
|
* @return bool True on success, False on failure
|
|
*/
|
|
public function delete_user_data($username)
|
|
{
|
|
$homedir = $this->rc->config->get('enigma_pgp_homedir', INSTALL_PATH . 'plugins/enigma/home');
|
|
$homedir .= DIRECTORY_SEPARATOR . $username;
|
|
|
|
return file_exists($homedir) ? self::delete_dir($homedir) : true;
|
|
}
|
|
|
|
/**
|
|
* Recursive method to remove directory with its content
|
|
*
|
|
* @param string Directory
|
|
*/
|
|
public static function delete_dir($dir)
|
|
{
|
|
// This code can be executed from command line, make sure
|
|
// we have permissions to delete keys directory
|
|
if (!is_writable($dir)) {
|
|
rcube::raise_error("Unable to delete $dir", false, true);
|
|
return false;
|
|
}
|
|
|
|
if ($content = scandir($dir)) {
|
|
foreach ($content as $filename) {
|
|
if ($filename != '.' && $filename != '..') {
|
|
$filename = $dir . DIRECTORY_SEPARATOR . $filename;
|
|
|
|
if (is_dir($filename)) {
|
|
self::delete_dir($filename);
|
|
}
|
|
else {
|
|
unlink($filename);
|
|
}
|
|
}
|
|
}
|
|
|
|
rmdir($dir);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Raise/log (relevant) errors
|
|
*/
|
|
protected static function raise_error($result, $line, $abort = false)
|
|
{
|
|
if ($result->getCode() != enigma_error::BADPASS) {
|
|
rcube::raise_error(array(
|
|
'code' => 600,
|
|
'file' => __FILE__,
|
|
'line' => $line,
|
|
'message' => "Enigma plugin: " . $result->getMessage()
|
|
), true, $abort);
|
|
}
|
|
}
|
|
}
|