Alert Handshake failure paypal IPN integration using fsockopen - php

Question

I have a problem when integrating paypal IPN to my website.
The warning is
"Warning: fsockopen() [function.fsockopen]: SSL operation failed with
code 1
OpenSSL Error messages:
error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert
handshake failure in /home/..." on this line: $fp = fsockopen
('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
I use fsockopen as I can only find working sample few months ago. But when I tried 2 days ago, it shown the error. Here's my code:
<?php
$return_url = "http://www.domain.com.au/member/payment.php";
$cancel_url = "http://www.domain.com.au/member/request.php";
$notify_url = "http://www.domain.com.au/member/payment.php";
// Check if paypal request or response
if (!isset($_POST["txn_id"]) && !isset($_POST["txn_type"])){
$querystring = '';
$paypalQueryString = "?business=".urlencode('my-facilitator#yahoo.com')."&";
$paypalQueryString .= "item_name=".urlencode('Item Name')."&";
$paypalQueryString .= "amount=".urlencode($totalPrice)."&";
$paypalQueryString .= "cmd=_xclick&no_note=1&lc=AU&currency_code=AUD&bn=PP-BuyNowBF%3Abtn_buynow_LG.gif%3ANonHostedGuest&";
$paypalQueryString .= "first_name=".urlencode($niceName)."&";
$paypalQueryString .= "last_name=&";
$paypalQueryString .= "payer_email=".urlencode($payerEmail)."&";
$paypalQueryString .= "item_number=".urlencode($accountID)."&";
$paypalQueryString .= "submit=Submit+Payment&";
$paypalQueryString .= "return=".urlencode(stripslashes($return_url))."&";
$paypalQueryString .= "cancel_return=".urlencode(stripslashes($cancel_url))."&";
$paypalQueryString .= "notify_url=".urlencode($notify_url);
// Redirect to paypal IPN
header('location:https://www.sandbox.paypal.com/cgi-bin/webscr'.$paypalQueryString);
//header('location:https://www.paypal.com/cgi-bin/webscr'.$paypalQueryString);
exit();
}
else {
//Response from Paypal
//echo "<pre>".var_dump($_POST)."</pre>";
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$value = preg_replace('/(.*[^%^0^D])(%0A)(.*)/i','${1}%0D%0A${3}',$value);// IPN fix
$req .= "&$key=$value";
}
// assign posted variables to local variables
$data['item_name'] = $_POST['item_name'];
$data['item_number'] = $_POST['item_number'];
$data['payment_status'] = $_POST['payment_status'];
$data['payment_amount'] = $_POST['mc_gross'];
$data['payment_currency'] = $_POST['mc_currency'];
$data['txn_id'] = $_POST['txn_id'];
$data['receiver_email'] = $_POST['receiver_email'];
$data['payer_email'] = $_POST['payer_email'];
$data['custom'] = $_POST['custom'];
$header = "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
//$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
if (!$fp) {
echo "HTTP Error";
}
else {
fputs($fp, $header . $req);
$res = stream_get_contents($fp, 2048);
if (strpos(trim($res), "VERIFIED") !== false) {
// update transaction --> paid status
}
else if (strpos (trim($res), "INVALID") !== false) {
}
else{
}
fclose ($fp);
}
}
?>
Hope anyone can help me. Thanks

Answer 1

I'm in a similar situation, but I'm using cURL instead of fsockopen. PayPal just started requiring all connections to the sandbox be done over TLS 1.2 (and HTTP 1.1).
https://devblog.paypal.com/upcoming-security-changes-notice/
Maybe try changing this line
$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
to this?
$fp = fsockopen ('tls://www.sandbox.paypal.com', 443, $errno, $errstr, 30);

Answer 2

You have to use the new CURL approach and ditch the old fsockopen way, this seems to be part of the new Paypal TLS 1.2 campaign.
I tested tls:// ssl:// and just plain https://www.sandbox.paypal.com/cgi-bin/webscr which all failed until I implemented the PHP Curl apprach below.
https://github.com/paypal/ipn-code-samples/blob/master/paypal_ipn.php
<?php
// CONFIG: Enable debug mode. This means we'll log requests into 'ipn.log' in the same directory.
// Especially useful if you encounter network errors or other intermittent problems with IPN (validation).
// Set this to 0 once you go live or don't require logging.
define("DEBUG", 1);
// Set to 0 once you're ready to go live
define("USE_SANDBOX", 1);
define("LOG_FILE", "./ipn.log");
// Read POST data
// reading posted data directly from $_POST causes serialization
// issues with array data in POST. Reading raw POST data from input stream instead.
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$myPost = array();
foreach ($raw_post_array as $keyval) {
$keyval = explode ('=', $keyval);
if (count($keyval) == 2)
$myPost[$keyval[0]] = urldecode($keyval[1]);
}
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
if(function_exists('get_magic_quotes_gpc')) {
$get_magic_quotes_exists = true;
}
foreach ($myPost as $key => $value) {
if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) {
$value = urlencode(stripslashes($value));
} else {
$value = urlencode($value);
}
$req .= "&$key=$value";
}
// Post IPN data back to PayPal to validate the IPN data is genuine
// Without this step anyone can fake IPN data
if(USE_SANDBOX == true) {
$paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
} else {
$paypal_url = "https://www.paypal.com/cgi-bin/webscr";
}
$ch = curl_init($paypal_url);
if ($ch == FALSE) {
return FALSE;
}
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
if(DEBUG == true) {
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, 1);
}
// CONFIG: Optional proxy configuration
//curl_setopt($ch, CURLOPT_PROXY, $proxy);
//curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
// Set TCP timeout to 30 seconds
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
// CONFIG: Please download 'cacert.pem' from "http://curl.haxx.se/docs/caextract.html" and set the directory path
// of the certificate as shown below. Ensure the file is readable by the webserver.
// This is mandatory for some environments.
//$cert = __DIR__ . "./cacert.pem";
//curl_setopt($ch, CURLOPT_CAINFO, $cert);
$res = curl_exec($ch);
if (curl_errno($ch) != 0) // cURL error
{
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Can't connect to PayPal to validate IPN message: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
exit;
} else {
// Log the entire HTTP response if debug is switched on.
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "HTTP request of validation request:". curl_getinfo($ch, CURLINFO_HEADER_OUT) ." for IPN payload: $req" . PHP_EOL, 3, LOG_FILE);
error_log(date('[Y-m-d H:i e] '). "HTTP response of validation request: $res" . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
}
// Inspect IPN validation result and act accordingly
// Split response headers and payload, a better way for strcmp
$tokens = explode("\r\n\r\n", trim($res));
$res = trim(end($tokens));
if (strcmp ($res, "VERIFIED") == 0) {
// check whether the payment_status is Completed
// check that txn_id has not been previously processed
// check that receiver_email is your PayPal email
// check that payment_amount/payment_currency are correct
// process payment and mark item as paid.
// assign posted variables to local variables
//$item_name = $_POST['item_name'];
//$item_number = $_POST['item_number'];
//$payment_status = $_POST['payment_status'];
//$payment_amount = $_POST['mc_gross'];
//$payment_currency = $_POST['mc_currency'];
//$txn_id = $_POST['txn_id'];
//$receiver_email = $_POST['receiver_email'];
//$payer_email = $_POST['payer_email'];
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Verified IPN: $req ". PHP_EOL, 3, LOG_FILE);
}
} else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
// Add business logic here which deals with invalid IPN messages
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Invalid IPN: $req" . PHP_EOL, 3, LOG_FILE);
}
}
?>