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cd /var/www
wget -O securimage.tar.gz https://github.com/dapphp/securimage/tarball/master
mkdir -p /var/www/frontac/securimage
tar -xzf securimage.tar.gz -C /var/www/frontac/securimage --strip-components=1

$_SESSION = Array (
......

    [securimage_code_disp]  => Array ( [default] => bnGp24 ) 
    [securimage_code_value] => Array ( [default] => bngp24 ) 
    [securimage_code_ctime] => Array ( [default] => 1347630909)

) 

$sn = (isset($_GET['sn']) ? trim($_GET['sn']) : 'PHPSESSID');
$oldsess = session_name($sn);

session_name($oldsess);

/*  Should FA use CAPTCHA for login form?
    false for no       true for yes
    Get the securimage code at https://github.com/dapphp/securimage/zipball/master
    Extract the contents into the securimage folder under the webroot.
*/

    $use_captcha_for_login = false;

//         Use CAPTCHA only for fresh login and not for timeouts
        if ($use_captcha_for_login && !($login_timeout)) 
        {
            start_row();
?>
            <td colspan="2">
                <img id="siimage" 
                    style="border: 1px solid #000; margin-right: 15px" 
                    src="securimage/securimage_show_n.php?sn=<?php echo session_name(); ?>&sid=<?php echo md5(uniqid()) ?>" 
                    alt="CAPTCHA Image" align="left">
                <object type="application/x-shockwave-flash" 
                    data="securimage/securimage_play.swf?bgcol=#ffffff&amp;icon_file=securimage/images/audio_icon.png&amp;audio_file=securimage/securimage_play.php" 
                    height="32" width="32">
                  <param name="movie" 
                    value="securimage/securimage_play.swf?bgcol=#ffffff&amp;icon_file=securimage/images/audio_icon.png&amp;audio_file=securimage/securimage_play.php" />
                </object>
                &nbsp;
                <a tabindex="-1" style="border-style: none;" href="#" title="Refresh Image" 
                    onclick="document.getElementById('siimage').src = 'securimage/securimage_show_n.php?sn=<?php echo session_name(); ?>&sid=' + Math.random(); this.blur(); return false">
                <img src="securimage/images/refresh.png" alt="Reload Image" 
                    height="32" width="32" 
                    onclick="this.blur()" align="bottom" border="0"></a>
                <br />
                <strong>Enter Code*:</strong><br />
                <input type="text" name="ct_captcha" size="12" maxlength="8" />
            </td>
<?php
            end_row();
        }

            if (!($this->timeout)) captchacheck();

function captchacheck() {
    global $use_captcha_for_login;

    if ($use_captcha_for_login) {
        // make sure that login_timeout is not affected
        if (isset($_POST['ct_captcha'])) $_SESSION['ct_captcha'] = $_POST['ct_captcha'];
        // Check CAPTCHA
        require_once 'securimage/securimage.php';
        $securimage = new Securimage();

        $usrcaptcha = $_SESSION['ct_captcha'];

        if ($securimage->check($usrcaptcha) == false) {
            // CAPTCHA Failed
            echo "The security code entered was incorrect.<br /><br />";
            echo "Please go <a href='javascript:history.go(-1)'>back</a> and try again.";
//            captcha session variables used - unset still cannot prevent cached image
            // unset($_SESSION['securimage_code_disp']);
            // unset($_SESSION['securimage_code_value']);
            // unset($_SESSION['securimage_code_ctime']);
            exit;
//            return false;
        } else {
            // CAPTCHA OK
            return true;
        }
    } else return true;

}