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(Unicode C++) Validate Certificate using OCSP ProtocolDemonstrates how to validate a certificate (check the revoked status) using the OCSP protocol. Note: This example requires Chilkat v9.5.0.75 or greater
#include <CkCertW.h> #include <CkPrngW.h> #include <CkJsonObjectW.h> #include <CkBinDataW.h> #include <CkHttpW.h> #include <CkHttpResponseW.h> void ChilkatSample(void) { // 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. CkCertW cert; bool success = cert.LoadFromFile(L"qa_data/certs/google.crt"); if (success != true) { wprintf(L"%s\n",cert.lastErrorText()); return; } // Get the cert's OCSP URL. const wchar_t *ocspUrl = cert.ocspUrl(); // Build the JSON that will be the OCSP request. CkPrngW prng; CkJsonObjectW json; json.put_EmitCompact(false); json.UpdateString(L"extensions.ocspNonce",prng.genRandom(36,L"base64")); json.put_I(0); json.UpdateString(L"request[i].cert.hashAlg",L"sha1"); json.UpdateString(L"request[i].cert.issuerNameHash",cert.hashOf(L"IssuerDN",L"sha1",L"base64")); json.UpdateString(L"request[i].cert.issuerKeyHash",cert.hashOf(L"IssuerPublicKey",L"sha1",L"base64")); json.UpdateString(L"request[i].cert.serialNumber",cert.serialNumber()); wprintf(L"%s\n",json.emit()); // Our OCSP request looks like this: // { // "extensions": { // "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO" // }, // "request": [ // { // "cert": { // "hashAlg": "sha1", // "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=", // "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=", // "serialNumber": "6175535D87BF94B6" // } // } // ] // } CkBinDataW ocspRequest; CkHttpW http; // Convert our JSON to a binary (ASN.1) OCSP request success = http.CreateOcspRequest(json,ocspRequest); if (success == false) { wprintf(L"%s\n",http.lastErrorText()); return; } // Send the OCSP request to the OCSP server CkHttpResponseW *resp = http.PBinaryBd(L"POST",ocspUrl,ocspRequest,L"application/ocsp-request",false,false); if (http.get_LastMethodSuccess() != true) { wprintf(L"%s\n",http.lastErrorText()); return; } // Get the binary (ASN.1) OCSP reply CkBinDataW ocspReply; resp->GetBodyBd(ocspReply); delete resp; // Convert the binary reply to JSON. // Also returns the overall OCSP response status. CkJsonObjectW jsonReply; int 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) { wprintf(L"Invalid OCSP reply.\n"); return; } wprintf(L"Overall OCSP Response Status: %d\n",ocspStatus); // Let's examine the OCSP response (in JSON). jsonReply.put_EmitCompact(false); wprintf(L"%s\n",jsonReply.emit()); // 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: int certStatus = -1; if (jsonReply.HasMember(L"response.cert[0].status") == true) { certStatus = jsonReply.IntOf(L"response.cert[0].status"); } // Possible certStatus values are: // -1: No status returned. // 0: Good // 1: Revoked // 2: Unknown. wprintf(L"Certificate Status: %d\n",certStatus); } |
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