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enigma_driver_gnupg.php
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enigma_driver_gnupg.php
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<?php
/*
+-------------------------------------------------------------------------+
| GnuPG (PGP) driver for the Enigma Plugin |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License version 2 |
| as published by the Free Software Foundation. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License along |
| with this program; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| |
+-------------------------------------------------------------------------+
| Author: Aleksander Machniak <alec@alec.pl> |
+-------------------------------------------------------------------------+
*/
require_once 'Crypt/GPG.php';
class enigma_driver_gnupg extends enigma_driver
{
private $rc;
private $gpg;
private $homedir;
private $user;
function __construct($user)
{
$rcmail = rcmail::get_instance();
$this->rc = $rcmail;
$this->user = $user;
}
/**
* Driver initialization and environment checking.
* Should only return critical errors.
*
* @return mixed NULL on success, enigma_error on failure
*/
function init()
{
$homedir = $this->rc->config->get('enigma_pgp_homedir', INSTALL_PATH . '/plugins/enigma/home');
if (!$homedir)
return new enigma_error(enigma_error::E_INTERNAL,
"Option 'enigma_pgp_homedir' not specified");
// check if homedir exists (create it if not) and is readable
if (!file_exists($homedir))
return new enigma_error(enigma_error::E_INTERNAL,
"Keys directory doesn't exists: $homedir");
if (!is_writable($homedir))
return new enigma_error(enigma_error::E_INTERNAL,
"Keys directory isn't writeable: $homedir");
$homedir = $homedir . '/' . $this->user;
// check if user's homedir exists (create it if not) and is readable
if (!file_exists($homedir))
mkdir($homedir, 0700);
if (!file_exists($homedir))
return new enigma_error(enigma_error::E_INTERNAL,
"Unable to create keys directory: $homedir");
if (!is_writable($homedir))
return new enigma_error(enigma_error::E_INTERNAL,
"Unable to write to keys directory: $homedir");
$this->homedir = $homedir;
// Create Crypt_GPG object
try {
$this->gpg = new Crypt_GPG(array(
'homedir' => $this->homedir,
// 'debug' => true,
));
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
function encrypt($text, $keys)
{
/*
foreach ($keys as $key) {
$this->gpg->addEncryptKey($key);
}
$enc = $this->gpg->encrypt($text);
return $enc;
*/
}
function decrypt($text, $key, $passwd)
{
// $this->gpg->addDecryptKey($key, $passwd);
try {
$dec = $this->gpg->decrypt($text);
return $dec;
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
function sign($text, $key, $passwd)
{
/*
$this->gpg->addSignKey($key, $passwd);
$signed = $this->gpg->sign($text, Crypt_GPG::SIGN_MODE_DETACHED);
return $signed;
*/
}
function verify($text, $signature)
{
try {
$verified = $this->gpg->verify($text, $signature);
return $this->parse_signature($verified[0]);
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
public function import($content, $isfile=false)
{
try {
if ($isfile)
return $this->gpg->importKeyFile($content);
else
return $this->gpg->importKey($content);
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
public function list_keys($pattern='')
{
try {
$keys = $this->gpg->getKeys($pattern);
$result = array();
//print_r($keys);
foreach ($keys as $idx => $key) {
$result[] = $this->parse_key($key);
unset($keys[$idx]);
}
//print_r($result);
return $result;
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
public function get_key($keyid)
{
$list = $this->list_keys($keyid);
if (is_array($list))
return array_shift($list);
// error
return $list;
}
public function gen_key($data)
{
}
public function del_key($keyid)
{
// $this->get_key($keyid);
}
public function del_privkey($keyid)
{
try {
$this->gpg->deletePrivateKey($keyid);
return true;
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
public function del_pubkey($keyid)
{
try {
$this->gpg->deletePublicKey($keyid);
return true;
}
catch (Exception $e) {
return $this->get_error_from_exception($e);
}
}
/**
* Converts Crypt_GPG exception into Enigma's error object
*
* @param mixed Exception object
*
* @return enigma_error Error object
*/
private function get_error_from_exception($e)
{
$data = array();
if ($e instanceof Crypt_GPG_KeyNotFoundException) {
$error = enigma_error::E_KEYNOTFOUND;
$data['id'] = $e->getKeyId();
}
else if ($e instanceof Crypt_GPG_BadPassphraseException) {
$error = enigma_error::E_BADPASS;
$data['bad'] = $e->getBadPassphrases();
$data['missing'] = $e->getMissingPassphrases();
}
else if ($e instanceof Crypt_GPG_NoDataException)
$error = enigma_error::E_NODATA;
else if ($e instanceof Crypt_GPG_DeletePrivateKeyException)
$error = enigma_error::E_DELKEY;
else
$error = enigma_error::E_INTERNAL;
$msg = $e->getMessage();
return new enigma_error($error, $msg, $data);
}
/**
* Converts Crypt_GPG_Signature object into Enigma's signature object
*
* @param Crypt_GPG_Signature Signature object
*
* @return enigma_signature Signature object
*/
private function parse_signature($sig)
{
$user = $sig->getUserId();
$data = new enigma_signature();
$data->id = $sig->getId();
$data->valid = $sig->isValid();
$data->fingerprint = $sig->getKeyFingerprint();
$data->created = $sig->getCreationDate();
$data->expires = $sig->getExpirationDate();
$data->name = $user->getName();
$data->comment = $user->getComment();
$data->email = $user->getEmail();
return $data;
}
/**
* Converts Crypt_GPG_Key object into Enigma's key object
*
* @param Crypt_GPG_Key Key object
*
* @return enigma_key Key object
*/
private function parse_key($key)
{
$ekey = new enigma_key();
foreach ($key->getUserIds() as $idx => $user) {
$id = new enigma_userid();
$id->name = $user->getName();
$id->comment = $user->getComment();
$id->email = $user->getEmail();
$id->valid = $user->isValid();
$id->revoked = $user->isRevoked();
$ekey->users[$idx] = $id;
}
$ekey->name = trim($ekey->users[0]->name . ' <' . $ekey->users[0]->email . '>');
foreach ($key->getSubKeys() as $idx => $subkey) {
$skey = new enigma_subkey();
$skey->id = $subkey->getId();
$skey->revoked = $subkey->isRevoked();
$skey->created = $subkey->getCreationDate();
$skey->expires = $subkey->getExpirationDate();
$skey->fingerprint = $subkey->getFingerprint();
$skey->has_private = $subkey->hasPrivate();
$skey->can_sign = $subkey->canSign();
$skey->can_encrypt = $subkey->canEncrypt();
$ekey->subkeys[$idx] = $skey;
};
$ekey->id = $ekey->subkeys[0]->id;
return $ekey;
}
}

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