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Filename : chpasswd.php
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<?php

/**
 * chpasswd driver
 *
 * Driver that adds functionality to change the systems user password via
 * the 'chpasswd' command.
 *
 * For installation instructions please read the README file.
 *
 * @version 2.0
 * @author Alex Cartwright <acartwright@mutinydesign.co.uk>
 *
 * Copyright (C) The Roundcube Dev Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see http://www.gnu.org/licenses/.
 */

class rcube_chpasswd_password
{
    public function save($currpass, $newpass, $username)
    {
        $cmd = rcmail::get_instance()->config->get('password_chpasswd_cmd');

        $handle = popen($cmd, "w");
        fwrite($handle, "$username:$newpass\n");

        if (pclose($handle) == 0) {
            return PASSWORD_SUCCESS;
        }

        rcube::raise_error([
                'code' => 600,
                'file' => __FILE__,
                'line' => __LINE__,
                'message' => "Password plugin: Unable to execute $cmd"
            ], true, false
        );

        return PASSWORD_ERROR;
    }
}