[英]Windows Store IAP signature validation against remote certificate, with PHP
我正在嘗試為Windows Store應用驗證PHP中的IAP收據。 基本上,嘗試將此示例代碼轉換為PHP http://msdn.microsoft.com/zh-cn/library/windows/apps/jj649137.aspx 。 收據看起來像這樣
<Receipt Version="1.0" ReceiptDate="2012-08-30T23:08:52Z" CertificateId="b809e47cd0110a4db043b3f73e83acd917fe1336" ReceiptDeviceId="4e362949-acc3-fe3a-e71b-89893eb4f528">
<ProductReceipt Id="6bbf4366-6fb2-8be8-7947-92fd5f683530" ProductId="Product1" PurchaseDate="2012-08-30T23:08:52Z" ExpirationDate="2012-09-02T23:08:49Z" ProductType="Durable" AppId="55428GreenlakeApps.CurrentAppSimulatorEventTest_z7q3q7z11crfr" />
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
<SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />
<Reference URI="">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
<DigestValue>Uvi8jkTYd3HtpMmAMpOm94fLeqmcQ2KCrV1XmSuY1xI=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>TT5fDET1X9nBk9/yKEJAjVASKjall3gw8u9N5Uizx4/Le9RtJtv+E9XSMjrOXK/TDicidIPLBjTbcZylYZdGPkMvAIc3/1mdLMZYJc+EXG9IsE9L74LmJ0OqGH5WjGK/UexAXxVBWDtBbDI2JLOaBevYsyy+4hLOcTXDSUA4tXwPa2Bi+BRoUTdYE2mFW7ytOJNEs3jTiHrCK6JRvTyU9lGkNDMNx9loIr+mRks+BSf70KxPtE9XCpCvXyWa/Q1JaIyZI7llCH45Dn4SKFn6L/JBw8G8xSTrZ3sBYBKOnUDbSCfc8ucQX97EyivSPURvTyImmjpsXDm2LBaEgAMADg==</SignatureValue>
</Signature>
</Receipt>
我已經像這樣檢索到服務器的證書
function getCertificate($certID)
{
$url = 'https://lic.apps.microsoft.com/licensing/certificateserver/?cid=' . $certID;
$path = '/mypath/certs/' . $certID;
if(!file_exists($path)) {
$fp = fopen($path, 'w');
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_FILE, $fp);
$data = curl_exec($ch);
curl_close($ch);
fclose($fp);
}
$cert = file_get_contents($path);
//var_dump(openssl_x509_parse($cert));
return openssl_x509_read($cert);
}
我認為SignatureValue是我的簽名。 據我所知,我需要的功能是openssl_verify,但是我不確定應該使用哪些參數,因為驗證總是失敗。
$data = $receiptXML->Signature->SignatureValue;
$pubkeyid = openssl_get_publickey($cert);
// state whether signature is okay or not
$ok = openssl_verify($receipt, $data, $pubkeyid, OPENSSL_ALGO_SHA256);
if($ok == 1) {
echo "good";
} elseif($ok == 0) {
echo "bad";
} else {
echo "ugly, error checking signature";
}
// free the key from memory
openssl_free_key($pubkeyid);
有人知道我在哪里出問題了嗎?
我花了幾天時間核對收據,最后使它運轉起來。
<?php
/**
* Date: 01.11.2013
* Time: 23:09
* @author: Philipp Serrer
*/
namespace Ephisa\Service\WindowsStore;
require_once subpath . 'vendor/xmlseclibs/xmlseclibs.php';
use Ephisa\Cache;
class Receipt {
private $doc;
private $objXMLSecDSig;
private $objDSig;
function __construct($xml, $isFile = false)
{
if ($isFile) {
$xml = file_get_contents($xml);
}
// strip unwanted chars - IMPORTANT!!!
$xml = str_replace(array("\n","\t", "\r"), "", $xml);
//some (probably mostly WP8) receipts have unnecessary spaces instead of tabs
$xml = preg_replace('/\s+/', " ", $xml);
$xml = str_replace("> <", "><", $xml);
$doc = new \DOMDocument();
$doc->loadXML($xml);
$objXMLSecDSig = new \XMLSecurityDSig();
$objDSig = $objXMLSecDSig->locateSignature($doc);
if (!$objDSig) {
throw new InvalidSignatureException();
}
//canonicalize
$objXMLSecDSig->canonicalizeSignedInfo();
$this->objDSig = $objDSig;
$this->objXMLSecDSig = $objXMLSecDSig;
$this->doc = $doc;
}
/**
* Returns the key for verification.
*
* @return null|\XMLSecurityKey
*/
function getKey()
{
$objKey = $this->objXMLSecDSig->locateKey();
$keyInfo = \XMLSecEnc::staticLocateKeyInfo($objKey, $this->objDSig);
if (!$keyInfo->key) {
$xpath = new \DOMXPath($this->doc);
$query = 'string(/Receipt/@CertificateId)';
$id = $xpath->evaluate($query);
Cache::instance()->setLifetime(60*60*24*7, 'win-store-cert');
$cert = Cache::instance()->get($id, 'win-store-cert', function() use ($id) {
return file_get_contents('https://lic.apps.microsoft.com/licensing/certificateserver/?cid=' . $id);
});
$objKey->loadKey($cert, false);
}
return $objKey;
}
/**
* Verifies the given receipt
*
* @return bool Returns TRUE on success
*/
function verify()
{
try {
if (!$this->objXMLSecDSig->validateReference()) {
return false;
}
return (bool)$this->objXMLSecDSig->verify($this->getKey());
}
catch (\Exception $e)
{
// failure...
}
return false;
}
}
這段代碼是我框架的一部分,因此包含一些框架依賴代碼(緩存),但是我認為您已經掌握了主要思想及其工作原理。 當然,您必須包含https://github.com/robrichards/xmlseclibs上可用的php xmlseclibs
首先,我建議將證書以二進制模式編寫。 這使得它不易出錯。 所以我推薦的是
if(!file_exists($path)) {
$fp = fopen($path, 'wb');
我在這里假定$ CERTID將具有XML收據中的CertificateId的值。 請按照您在代碼中聲明的名稱進行重命名。
$cert = getCertificate($CERTID)
if($cert == 0) {
echo "bad";
} else {
$data = $receiptXML->Signature->SignatureValue;
$pubkeyid = openssl_get_publickey($cert);
// state whether signature is okay or not
$ok = openssl_verify($receiptXML, $data, $pubkeyid, OPENSSL_ALGO_SHA256);
if($ok == 1) {
echo "good";
} elseif($ok == 0) {
echo "bad";
} else {
echo "ugly, error checking signature";
}
}
希望這可以幫助 :)
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