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reCAPTCHA question

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  reCAPTCHA question doctor@doctor.nl2k.ab.ca (The Doctor) - 2015-09-05 02:12 +0000
    Re: reCAPTCHA question Denis McMahon <denismfmcmahon@gmail.com> - 2015-09-05 23:08 +0000
      Re: reCAPTCHA question doctor@doctor.nl2k.ab.ca (The Doctor) - 2015-09-05 23:31 +0000
    Re: reCAPTCHA question "J.O. Aho" <user@example.net> - 2015-09-06 10:10 +0200

#15655 — reCAPTCHA question

All right I have a php mail script as follows:


<?php
	$owner_email='email';
	//SMTP server settings	
	$host = 'mail.nk.ca';
    $port = '465';//"587";
    $username = 'user';
    $password = 'pw';

    $subject='A message from your site visitor ';
    $user_email='';    
	$message_body='';
	$message_type='html';

	$max_file_size=50;//MB 
	$file_types='/(doc|docx|txt|pdf|zip|rar)$/';
	$error_text='something goes wrong';
	$error_text_filesize='File size must be less than';
	$error_text_filetype='Failed to upload file. This file type is not allowed. Accepted files types: doc, docx, txt, pdf, zip, rar.';

	$private_recaptcha_key='6LeZwukSAAAAACmqrbLmdpvdhC68NLB1c9EA5vzU'; //localhost
	
	
	$use_recaptcha=isset( $_POST["recaptcha_challenge_field"]) and isset($_POST["recaptcha_response_field"]);
	$use_smtp=($host=='' or $username=='' or $password=='');
	$max_file_size*=1048576;

	if($owner_email==''){
		die('Attention, recipient e-mail is not set! Please define "owner_email" variable in the MailHanlder.php file.');
	}

	if(preg_match('/^(127\.|192\.168\.)/',$_SERVER['REMOTE_ADDR'])){
		die('Attention, contact form will not work locally! Please upload your template to a live hosting server.');
	}

	if($use_recaptcha){
		require_once('recaptchalib.php');
		$resp = recaptcha_check_answer ($private_recaptcha_key,$_SERVER["REMOTE_ADDR"],$_POST["recaptcha_challenge_field"],$_POST["recaptcha_response_field"]);
		if (!$resp->is_valid){
			die ('wrong captcha');
		}
	}
	
	if(isset($_POST['name']) and $_POST['name'] != ''){$message_body .= '<p>Visitor: ' . $_POST['name'] . '</p>' . "\n" . '<br>' . "\n"; $subject.=$_POST['name'];}
	if(isset($_POST['email']) and $_POST['email'] != ''){$message_body .= '<p>Email Address: ' . $_POST['email'] . '</p>' . "\n" . '<br>' . "\n"; $user_email=$_POST['email'];}
	if(isset($_POST['state']) and $_POST['state'] != ''){$message_body .= '<p>State: ' . $_POST['state'] . '</p>' . "\n" . '<br>' . "\n";}
	if(isset($_POST['phone']) and $_POST['phone'] != ''){$message_body .= '<p>Phone Number: ' . $_POST['phone'] . '</p>' . "\n" . '<br>' . "\n";}	
	if(isset($_POST['fax']) and $_POST['fax'] != ''){$message_body .= '<p>Fax Number: ' . $_POST['fax'] . '</p>' . "\n" . '<br>' . "\n";}
	if(isset($_POST['message']) and $_POST['message'] != ''){$message_body .= '<p>Message: ' . $_POST['message'] . '</p>' . "\n";}	
	if(isset($_POST['stripHTML']) and $_POST['stripHTML']=='true'){$message_body = strip_tags($message_body);$message_type='text';}

try{
	include "libmail.php";
	$m= new Mail("utf-8");
	$m->From($user_email);
	$m->To($owner_email);
	$m->Subject($subject);
	$m->Body($message_body,$message_type);
	//$m->log_on(true);

	if(isset($_FILES['attachment'])){
		if($_FILES['attachment']['size']>$max_file_size){
			$error_text=$error_text_filesize . ' ' . $max_file_size . 'bytes';
			die($error_text);			
		}else{			
			if(preg_match($file_types,$_FILES['attachment']['name'])){
				$m->Attach($_FILES['attachment']['tmp_name'],$_FILES['attachment']['name'],'','attachment');
			}else{
				$error_text=$error_text_filetype;
				die($error_text);				
			}
		}		
	}
	if(!$use_smtp){
		$m->smtp_on( $host, $username, $password, $port);
	}

	if($m->Send()){
		die('success');
	}	
	
}catch(Exception $mail){
	die($mail);
}	
?>

And the recaptcha code is


<?php
/*
 * 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
 *
 * 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.
 */

/**
 * The reCAPTCHA server URL's
 */
define("RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api/");
define("RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api/");
define("RECAPTCHA_VERIFY_SERVER", "www.google.com");

/**
 * 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) {

        $req = _recaptcha_qsencode ($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;
}



/**
 * Gets the challenge HTML (javascript and non-javascript version).
 * This is called from the browser, and the resulting reCAPTCHA HTML widget
 * is embedded within the HTML form it was called from.
 * @param string $pubkey A public key for reCAPTCHA
 * @param string $error The error given by reCAPTCHA (optional, default is null)
 * @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)

 * @return string - The HTML to be embedded in the user's form.
 */
function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
{
	if ($pubkey == null || $pubkey == '') {
		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 = RECAPTCHA_API_SECURE_SERVER;
        } else {
                $server = RECAPTCHA_API_SERVER;
        }

        $errorpart = "";
        if ($error) {
           $errorpart = "&amp;error=" . $error;
        }
        return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>

	<noscript>
  		<iframe src="'. $server . '/noscript?k=' . $pubkey . $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>';
}




/**
 * A ReCaptchaResponse is returned from recaptcha_check_answer()
 */
class ReCaptchaResponse {
        var $is_valid;
        var $error;
}


/**
  * Calls an HTTP POST function to verify if the user's guess was correct
  * @param string $privkey
  * @param string $remoteip
  * @param string $challenge
  * @param string $response
  * @param array $extra_params an array of extra variables to post to the server
  * @return ReCaptchaResponse
  */
function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())
{
	if ($privkey == null || $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>");
	}

	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) {
                $recaptcha_response = new ReCaptchaResponse();
                $recaptcha_response->is_valid = false;
                $recaptcha_response->error = 'incorrect-captcha-sol';
                return $recaptcha_response;
        }

        $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",
                                          array (
                                                 'privatekey' => $privkey,
                                                 'remoteip' => $remoteip,
                                                 'challenge' => $challenge,
                                                 'response' => $response
                                                 ) + $extra_params
                                          );

        $answers = explode ("\n", $response [1]);
        $recaptcha_response = new ReCaptchaResponse();

        if (trim ($answers [0]) == 'true') {
                $recaptcha_response->is_valid = true;
        }
        else {
                $recaptcha_response->is_valid = false;
                $recaptcha_response->error = $answers [1];
        }
        return $recaptcha_response;

}

/**
 * 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 = null) {
	return "https://www.google.com/recaptcha/admin/create?" .  _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;
	$val=_recaptcha_aes_pad($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($pubkey, $privkey, $email) {
	if ($pubkey == '' || $pubkey == null || $privkey == "" || $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*', $privkey);
	$cryptmail = _recaptcha_aes_encrypt ($email, $ky);
	
	return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($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($pubkey, $privkey, $email) {
	$emailparts = _recaptcha_mailhide_email_parts ($email);
	$url = recaptcha_mailhide_url ($pubkey, $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]);

}


?>


Anything wrong with this?

-- 
Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca
God,Queen and country!Never Satan President Republic!Beware AntiChrist rising! 
http://www.fullyfollow.me/rootnl2k  Look at Psalms 14 and 53 on Atheism
Time for Stephen to move on on Oct 19 2015!!

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#15656

On Sat, 05 Sep 2015 02:12:57 +0000, The Doctor wrote:

> All right I have a php mail script as follows:

> [snipped]

> Anything wrong with this?

I have no idea. Is it working properly? If not, what have you tried so 
far to debug it? Have you asked the maintainer if the captcha code for 
help? Have you checked that the right data is being passed between 
various blocks of code?

-- 
Denis McMahon, denismfmcmahon@gmail.com

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#15657

In article <msfslb$mb5$1@dont-email.me>,
Denis McMahon  <denismfmcmahon@gmail.com> wrote:
>On Sat, 05 Sep 2015 02:12:57 +0000, The Doctor wrote:
>
>> All right I have a php mail script as follows:
>
>> [snipped]
>
>> Anything wrong with this?
>
>I have no idea. Is it working properly? If not, what have you tried so 
>far to debug it? Have you asked the maintainer if the captcha code for 
>help? Have you checked that the right data is being passed between 
>various blocks of code?
>
This is google source.  I have asked them and still waiting for an answer.

>-- 
>Denis McMahon, denismfmcmahon@gmail.com


-- 
Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca
God,Queen and country!Never Satan President Republic!Beware AntiChrist rising! 
http://www.fullyfollow.me/rootnl2k  Look at Psalms 14 and 53 on Atheism
Time for Stephen to move on on Oct 19 2015!!

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#15658

On 09/05/2015 04:12 AM, The Doctor wrote:
> All right I have a php mail script as follows:
> Anything wrong with this?

I will not look at the captcha but other things

> <?php
> 	$owner_email='email';
> 	//SMTP server settings	
> 	$host = 'mail.nk.ca';
>      $port = '465';//"587";
>      $username = 'user';
>      $password = 'pw';

I would not include the configuration in this script, include those from 
a file which ain't accessible for the web server, keep it outside the 
documentroot, this way you don't have to fear that the username/password 
will be as easily accessed by someone out on the internet if there would 
be something wrong with the php and it would suddenly send the source 
code than the processed result.

>      $subject='A message from your site visitor ';
>      $user_email='';
> 	$message_body='';
> 	$message_type='html';
>
> 	$max_file_size=50;//MB
> 	$file_types='/(doc|docx|txt|pdf|zip|rar)$/';
> 	$error_text='something goes wrong';
> 	$error_text_filesize='File size must be less than';
> 	$error_text_filetype='Failed to upload file. This file type is not allowed. Accepted files types: doc, docx, txt, pdf, zip, rar.';
>
> 	$private_recaptcha_key='6LeZwukSAAAAACmqrbLmdpvdhC68NLB1c9EA5vzU'; //localhost
> 	
> 	
> 	$use_recaptcha=isset( $_POST["recaptcha_challenge_field"]) and isset($_POST["recaptcha_response_field"]);
> 	$use_smtp=($host=='' or $username=='' or $password=='');
> 	$max_file_size*=1048576;
>
> 	if($owner_email==''){
> 		die('Attention, recipient e-mail is not set! Please define "owner_email" variable in the MailHanlder.php file.');
> 	}
>
> 	if(preg_match('/^(127\.|192\.168\.)/',$_SERVER['REMOTE_ADDR'])){
> 		die('Attention, contact form will not work locally! Please upload your template to a live hosting server.');
> 	}
>
> 	if($use_recaptcha){
> 		require_once('recaptchalib.php');
> 		$resp = recaptcha_check_answer ($private_recaptcha_key,$_SERVER["REMOTE_ADDR"],$_POST["recaptcha_challenge_field"],$_POST["recaptcha_response_field"]);
> 		if (!$resp->is_valid){
> 			die ('wrong captcha');
> 		}
> 	}
> 	
> 	if(isset($_POST['name']) and $_POST['name'] != ''){$message_body .= '<p>Visitor: ' . $_POST['name'] . '</p>' . "\n" . '<br>' . "\n"; $subject.=$_POST['name'];}
> 	if(isset($_POST['email']) and $_POST['email'] != ''){$message_body .= '<p>Email Address: ' . $_POST['email'] . '</p>' . "\n" . '<br>' . "\n"; $user_email=$_POST['email'];}
> 	if(isset($_POST['state']) and $_POST['state'] != ''){$message_body .= '<p>State: ' . $_POST['state'] . '</p>' . "\n" . '<br>' . "\n";}
> 	if(isset($_POST['phone']) and $_POST['phone'] != ''){$message_body .= '<p>Phone Number: ' . $_POST['phone'] . '</p>' . "\n" . '<br>' . "\n";}	
> 	if(isset($_POST['fax']) and $_POST['fax'] != ''){$message_body .= '<p>Fax Number: ' . $_POST['fax'] . '</p>' . "\n" . '<br>' . "\n";}
> 	if(isset($_POST['message']) and $_POST['message'] != ''){$message_body .= '<p>Message: ' . $_POST['message'] . '</p>' . "\n";}	
> 	if(isset($_POST['stripHTML']) and $_POST['stripHTML']=='true'){$message_body = strip_tags($message_body);$message_type='text';}
>
> try{
> 	include "libmail.php";
> 	$m= new Mail("utf-8");
> 	$m->From($user_email);
> 	$m->To($owner_email);
> 	$m->Subject($subject);
> 	$m->Body($message_body,$message_type);

There is no check against header injections, this form will most likely 
be used for spamming if accessible from the internet as the libmail.php 
will not do any checks for you, so you have to do it yourself.

> 	//$m->log_on(true);
>
> 	if(isset($_FILES['attachment'])){
> 		if($_FILES['attachment']['size']>$max_file_size){
> 			$error_text=$error_text_filesize . ' ' . $max_file_size . 'bytes';
> 			die($error_text);			
> 		}else{			
> 			if(preg_match($file_types,$_FILES['attachment']['name'])){
> 				$m->Attach($_FILES['attachment']['tmp_name'],$_FILES['attachment']['name'],'','attachment');
> 			}else{
> 				$error_text=$error_text_filetype;
> 				die($error_text);				
> 			}
> 		}		
> 	}
> 	if(!$use_smtp){
> 		$m->smtp_on( $host, $username, $password, $port);
> 	}
>
> 	if($m->Send()){
> 		die('success');
> 	}	
> 	
> }catch(Exception $mail){
> 	die($mail);
> }	
> ?>

-- 

  //Aho

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