Google Recaptcha being ignored with form action - php

Question

Just integrated Google Recaptcha. I am using this form as a POST to a secure checkout for a secure transaction site ( API ).
My challenge is, I have the form action =
"action="https://securepayments.cardconnect.com/hpp/payment/"
And event if I use :
if (isset($_POST['submit'])) {
to validate the :: recaptcha :: it still just goes straight to the form action URL without verifying the recaptcha.
Here is more code:
$secret = '-- XX --';
$response = $_POST['g-recaptcha-response'];
$remoteip = $_SERVER['REMOTE_ADDR'];
$url = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=$secret&response=$response&remoteip=$remoteip");
$res = json_decode($unpass, TRUE);
$result = json_decode($url, TRUE);
if ($result['success'] == 1) {
echo $_POST['name'];
echo $_POST['companyname'];
}
else { echo 'you are a robot'; }
}
The form action URL passes POST / hidden variables to connect via MID/Password to authenticate itself with the API. I can't figure out how to integrate a solution to use recaptcha and then do the form action. Any help would be awesome!

Answer 1

function isValid()
{
try {
$url = 'https://www.google.com/recaptcha/api/siteverify';
$data = ['secret' => 'secret',
'response' => $_POST['g-recaptcha-response'],
'remoteip' => $_SERVER['REMOTE_ADDR']];
$options = [
'http' => [
'header' => "Content-type: application/x-www-form-urlencoded\r\n",
'method' => 'POST',
'content' => http_build_query($data)
]
];
$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);
return json_decode($result)->success;
}
catch (Exception $e) {
return null;
}
}
if($_POST && isValid())
{
//do stuff
}

Answer 2

Why you don't use the Recaptcha Library?
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class Recaptcha
{
/*
* This is a PHP library that handles calling reCAPTCHA.
* - Documentation and latest version
* http://recaptcha.net/plugins/php/
* - Get a reCAPTCHA API Key
* https://www.google.com/recaptcha/admin/create
* - Discussion group
* http://groups.google.com/group/recaptcha
*
* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
* AUTHORS:
* Mike Crawford
* Ben Maurer
*
* CONTRIBUTION:
* Codeigniter version - 23.08.2012 by Christer Nordbø, Norway.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*
* UPDATE HISTORY:
* 28.08.2013 - Made recaptcha_check_answer() function bit simpler on default
* fields as html is generated by recaptcha_get_html() function.
* Updated by - Puneet Kalra (https://github.com/puneetkay)
*/
/**
* The reCAPTCHA server URL's
*/
const RECAPTCHA_API_SERVER = "http://www.google.com/recaptcha/api";
const RECAPTCHA_API_SECURE_SERVER = "https://www.google.com/recaptcha/api";
const RECAPTCHA_VERIFY_SERVER = "www.google.com";
protected $is_valid;
protected $error;
//Remember to obtain the Public and Private key # https://www.google.com/recaptcha/admin/create
protected $public_key = "YOUR PUBLIC KEY";
protected $privkey = "YOUR PRIVATE KEY";
protected $options = array();
function __construct()
{
log_message('debug', "RECAPTCHA Class Initialized.");
$this->_ci =& get_instance();
//Load the CI Config file for recaptcha
$this->_ci->load->config('recaptcha');
//load in the values from the config file.
$this->public_key = $this->_ci->config->item('public_key');
$this->privkey = $this->_ci->config->item('private_key');
$this->options = $this->_ci->config->item('recaptcha_options');
//Lets do some basic error handling to see if the configuration is A-OK.
$temp_error_msg = '';
if ($this->public_key === 'YOUR PUBLIC KEY') {
$temp_error_msg .= 'You need to set your public key in the config file <br />';
}
if ($this->privkey === 'YOUR PRIVATE KEY') {
$temp_error_msg .= 'You need to set your private key in the config file <br />';
}
if ($temp_error_msg != '') {
show_error($temp_error_msg);
}
}
/**
* Encodes the given data into a query string format
* #param $data - array of string elements to be encoded
* #return string - encoded request
*/
function recaptcha_qsencode($data)
{
$req = "";
foreach ($data as $key => $value)
$req .= $key . '=' . urlencode(stripslashes($value)) . '&';
// Cut the last '&'
$req = substr($req, 0, strlen($req) - 1);
return $req;
}
/**
* Submits an HTTP POST to a reCAPTCHA server
* #param string $host
* #param string $path
* #param array $data
* #param int port
* #return array response
*/
function recaptcha_http_post($host, $path, $data, $port = 80)
{
$req = $this->recaptcha_qsencode($data);
$http_request = "POST $path HTTP/1.0\r\n";
$http_request .= "Host: $host\r\n";
$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
$http_request .= "Content-Length: " . strlen($req) . "\r\n";
$http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
$http_request .= "\r\n";
$http_request .= $req;
$response = '';
if (false == ($fs = #fsockopen($host, $port, $errno, $errstr, 10))) {
die ('Could not open socket');
}
fwrite($fs, $http_request);
while (!feof($fs))
$response .= fgets($fs, 1160); // One TCP-IP packet
fclose($fs);
$response = explode("\r\n\r\n", $response, 2);
return $response;
}
function recaptcha_get_html($error = null, $use_ssl = false)
{
if ($this->public_key == null || $this->public_key == '') {
die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
}
if ($use_ssl) {
$server = self::RECAPTCHA_API_SECURE_SERVER;
} else {
$server = self::RECAPTCHA_API_SERVER;
}
$errorpart = "";
if ($error) {
$errorpart = "&error=" . $error;
}
$options = "";
foreach ($this->options as $key => $value) {
$options .= $key . ':"' . $value . '", ';
}
return '<script type="text/javascript"> var RecaptchaOptions = { ' . $options . ' }; </script>
<script type="text/javascript" src="' . $server . '/challenge?k=' . $this->public_key . $errorpart . '"></script>
<noscript>
<iframe src="' . $server . '/noscript?k=' . $this->public_key . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/>
<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
</noscript>';
}
/**
* Calls an HTTP POST function to verify if the user's guess was correct
* #param string $remoteip
* #param string $challenge
* #param string $response
* #param array $extra_params an array of extra variables to post to the server
* #return ReCaptchaResponse
*/
function recaptcha_check_answer($remoteip = null, $challenge = null, $response = null, $extra_params = array())
{
if ($this->privkey == null || $this->privkey == '') {
die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
}
$remoteip = ($remoteip == null) ? $_SERVER['REMOTE_ADDR'] : $remoteip;
$challenge = ($challenge == null) ? $this->_ci->input->post('recaptcha_challenge_field') : $challenge;
$response = ($response == null) ? $this->_ci->input->post('recaptcha_response_field') : $response;
if ($remoteip == null || $remoteip == '') {
die ("For security reasons, you must pass the remote ip to reCAPTCHA");
}
//discard spam submissions
if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
$this->is_valid = false;
$this->error = 'incorrect-captcha-sol';
}
$response = $this->recaptcha_http_post(self::RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",
array(
'privatekey' => $this->privkey,
'remoteip' => $remoteip,
'challenge' => $challenge,
'response' => $response
) + $extra_params
);
$answers = explode("\n", $response [1]);
if (trim($answers [0]) == 'true') {
$this->is_valid = true;
} else {
$this->is_valid = false;
$this->error = $answers [1];
}
}
/**
* gets a URL where the user can sign up for reCAPTCHA. If your application
* has a configuration page where you enter a key, you should provide a link
* using this function.
* #param string $domain The domain where the page is hosted
* #param string $appname The name of your application
*/
function recaptcha_get_signup_url($domain = null, $appname = 'Codeigniter')
{
return "https://www.google.com/recaptcha/admin/create?" . $this->recaptcha_qsencode(array('domains' => $domain, 'app' => $appname));
}
function recaptcha_aes_pad($val)
{
$block_size = 16;
$numpad = $block_size - (strlen($val) % $block_size);
return str_pad($val, strlen($val) + $numpad, chr($numpad));
}
/* Mailhide related code */
function recaptcha_aes_encrypt($val, $ky)
{
if (!function_exists("mcrypt_encrypt")) {
die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");
}
$mode = MCRYPT_MODE_CBC;
$enc = MCRYPT_RIJNDAEL_128;
$val = $this->recaptcha_aes_pad($val);
return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
}
function recaptcha_mailhide_urlbase64($x)
{
return strtr(base64_encode($x), '+/', '-_');
}
/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
function recaptcha_mailhide_url($email)
{
if ($this->public_key == '' || $this->public_key == null || $this->privkey == "" || $this->privkey == null) {
die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
"you can do so at <a href='http://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>");
}
$ky = pack('H*', $this->privkey);
$cryptmail = $this->recaptcha_aes_encrypt($email, $ky);
return "http://www.google.com/recaptcha/mailhide/d?k=" . $this->public_key . "&c=" . $this->recaptcha_mailhide_urlbase64($cryptmail);
}
/**
* gets the parts of the email to expose to the user.
* eg, given johndoe#example,com return ["john", "example.com"].
* the email is then displayed as john...#example.com
*/
function recaptcha_mailhide_email_parts($email)
{
$arr = preg_split("/#/", $email);
if (strlen($arr[0]) <= 4) {
$arr[0] = substr($arr[0], 0, 1);
} else if (strlen($arr[0]) <= 6) {
$arr[0] = substr($arr[0], 0, 3);
} else {
$arr[0] = substr($arr[0], 0, 4);
}
return $arr;
}
/**
* Gets html to display an email address given a public an private key.
* to get a key, go to:
*
* http://www.google.com/recaptcha/mailhide/apikey
*/
function recaptcha_mailhide_html($email)
{
$emailparts = $this->recaptcha_mailhide_email_parts($email);
$url = $this->recaptcha_mailhide_url($this->public_key, $this->privkey, $email);
return htmlentities($emailparts[0]) . "<a href='" . htmlentities($url) .
"' onclick=\"window.open('" . htmlentities($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>#" . htmlentities($emailparts [1]);
}
function checkIfIsValid()
{
if ($this->getIsValid()) {
return $this->getIsValid();
} else {
return array($this->getIsValid(), $this->getError());
}
}
function getIsValid()
{
return $this->is_valid;
}
function getError()
{
return $this->error;
}
}
Use it:
$this->load->library('recaptcha');
$this->recaptcha->recaptcha_check_answer();
if (!$this->recaptcha->getIsValid()) {
$this->session->set_flashdata('error', 'Código Captcha incorrecto');
redirect(base_url() . 'add');
}
unset($post['recaptcha_challenge_field']);
unset($post['recaptcha_response_field']);