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(PHP Extension) Validate Certificate using OCSP ProtocolDemonstrates how to validate a certificate (check the revoked status) using the OCSP protocol.
<?php include("chilkat.php"); // Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0 // Note: Requires Chilkat v9.5.0.75 or greater. // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example will check the revoked status of a certificate loaded from a file. $cert = new CkCert(); $success = $cert->LoadFromFile('qa_data/certs/google.crt'); if ($success != true) { print $cert->lastErrorText() . "\n"; exit; } // Get the cert's OCSP URL. $ocspUrl = $cert->ocspUrl(); // Build the JSON that will be the OCSP request. // Possible hash algorithms are sha1, sha256, sha384, sha512. $hashAlg = 'sha256'; $prng = new CkPrng(); $json = new CkJsonObject(); $json->put_EmitCompact(false); // Read more about OCSP nonce lengths $json->UpdateString('extensions.ocspNonce',$prng->genRandom(16,'base64')); $json->put_I(0); $json->UpdateString('request[i].cert.hashAlg',$hashAlg); $json->UpdateString('request[i].cert.issuerNameHash',$cert->hashOf('IssuerDN',$hashAlg,'base64')); $json->UpdateString('request[i].cert.issuerKeyHash',$cert->hashOf('IssuerPublicKey',$hashAlg,'base64')); $json->UpdateString('request[i].cert.serialNumber',$cert->serialNumber()); print $json->emit() . "\n"; // Our OCSP request looks something like this: // { // "extensions": { // "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO" // }, // "request": [ // { // "cert": { // "hashAlg": "sha1", // "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=", // "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=", // "serialNumber": "6175535D87BF94B6" // } // } // ] // } $ocspRequest = new CkBinData(); $http = new CkHttp(); // Convert our JSON to a binary (ASN.1) OCSP request $success = $http->CreateOcspRequest($json,$ocspRequest); if ($success == false) { print $http->lastErrorText() . "\n"; exit; } // Send the OCSP request to the OCSP server // resp is a CkHttpResponse $resp = $http->PBinaryBd('POST',$ocspUrl,$ocspRequest,'application/ocsp-request',false,false); if ($http->get_LastMethodSuccess() != true) { print $http->lastErrorText() . "\n"; exit; } // Get the binary (ASN.1) OCSP reply $ocspReply = new CkBinData(); $resp->GetBodyBd($ocspReply); // Convert the binary reply to JSON. // Also returns the overall OCSP response status. $jsonReply = new CkJsonObject(); $ocspStatus = $http->ParseOcspReply($ocspReply,$jsonReply); // The ocspStatus can have one of these values: // -1: The ARG1 does not contain a valid OCSP reply. // 0: Successful - Response has valid confirmations.. // 1: Malformed request - Illegal confirmation request. // 2: Internal error - Internal error in issuer. // 3: Try later - Try again later. // 4: Not used - This value is never returned. // 5: Sig required - Must sign the request. // 6: Unauthorized - Request unauthorized. if ($ocspStatus < 0) { print 'Invalid OCSP reply.' . "\n"; exit; } print 'Overall OCSP Response Status: ' . $ocspStatus . "\n"; // Let's examine the OCSP response (in JSON). $jsonReply->put_EmitCompact(false); print $jsonReply->emit() . "\n"; // The JSON reply looks like this: // (Use the online tool at https://tools.chilkat.io/jsonParse.cshtml // to generate JSON parsing code.) // { // "responseStatus": 0, // "responseTypeOid": "1.3.6.1.5.5.7.48.1.1", // "responseTypeName": "ocspBasic", // "response": { // "responderIdChoice": "KeyHash", // "responderKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=", // "dateTime": "20180803193937Z", // "cert": [ // { // "hashOid": "1.3.14.3.2.26", // "hashAlg": "SHA-1", // "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=", // "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=", // "serialNumber": "6175535D87BF94B6", // "status": 0, // "thisUpdate": "20180803193937Z", // "nextUpdate": "20180810193937Z" // } // ] // } // } // // The certificate status: $certStatus = -1; if ($jsonReply->HasMember('response.cert[0].status') == true) { $certStatus = $jsonReply->IntOf('response.cert[0].status'); } // Possible certStatus values are: // -1: No status returned. // 0: Good // 1: Revoked // 2: Unknown. print 'Certificate Status: ' . $certStatus . "\n"; ?> |
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