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(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 <C_CkCert.h> #include <C_CkPrng.h> #include <C_CkJsonObject.h> #include <C_CkBinData.h> #include <C_CkHttp.h> #include <C_CkHttpResponse.h> void ChilkatSample(void) { HCkCert cert; BOOL success; const char *ocspUrl; HCkPrng prng; HCkJsonObject json; HCkBinData ocspRequest; HCkHttp http; HCkHttpResponse resp; HCkBinData ocspReply; HCkJsonObject jsonReply; int ocspStatus; int certStatus; // 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 = CkCert_Create(); success = CkCert_LoadFromFile(cert,"qa_data/certs/google.crt"); if (success != TRUE) { printf("%s\n",CkCert_lastErrorText(cert)); CkCert_Dispose(cert); return; } // Get the cert's OCSP URL. ocspUrl = CkCert_ocspUrl(cert); // Build the JSON that will be the OCSP request. prng = CkPrng_Create(); json = CkJsonObject_Create(); CkJsonObject_putEmitCompact(json,FALSE); CkJsonObject_UpdateString(json,"extensions.ocspNonce",CkPrng_genRandom(prng,36,"base64")); CkJsonObject_putI(json,0); CkJsonObject_UpdateString(json,"request[i].cert.hashAlg","sha1"); CkJsonObject_UpdateString(json,"request[i].cert.issuerNameHash",CkCert_hashOf(cert,"IssuerDN","sha1","base64")); CkJsonObject_UpdateString(json,"request[i].cert.issuerKeyHash",CkCert_hashOf(cert,"IssuerPublicKey","sha1","base64")); CkJsonObject_UpdateString(json,"request[i].cert.serialNumber",CkCert_serialNumber(cert)); printf("%s\n",CkJsonObject_emit(json)); // Our OCSP request looks like this: // { // "extensions": { // "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO" // }, // "request": [ // { // "cert": { // "hashAlg": "sha1", // "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=", // "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=", // "serialNumber": "6175535D87BF94B6" // } // } // ] // } ocspRequest = CkBinData_Create(); http = CkHttp_Create(); // Convert our JSON to a binary (ASN.1) OCSP request success = CkHttp_CreateOcspRequest(http,json,ocspRequest); if (success == FALSE) { printf("%s\n",CkHttp_lastErrorText(http)); CkCert_Dispose(cert); CkPrng_Dispose(prng); CkJsonObject_Dispose(json); CkBinData_Dispose(ocspRequest); CkHttp_Dispose(http); return; } // Send the OCSP request to the OCSP server resp = CkHttp_PBinaryBd(http,"POST",ocspUrl,ocspRequest,"application/ocsp-request",FALSE,FALSE); if (CkHttp_getLastMethodSuccess(http) != TRUE) { printf("%s\n",CkHttp_lastErrorText(http)); CkCert_Dispose(cert); CkPrng_Dispose(prng); CkJsonObject_Dispose(json); CkBinData_Dispose(ocspRequest); CkHttp_Dispose(http); return; } // Get the binary (ASN.1) OCSP reply ocspReply = CkBinData_Create(); CkHttpResponse_GetBodyBd(resp,ocspReply); CkHttpResponse_Dispose(resp); // Convert the binary reply to JSON. // Also returns the overall OCSP response status. jsonReply = CkJsonObject_Create(); ocspStatus = CkHttp_ParseOcspReply(http,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) { printf("Invalid OCSP reply.\n"); CkCert_Dispose(cert); CkPrng_Dispose(prng); CkJsonObject_Dispose(json); CkBinData_Dispose(ocspRequest); CkHttp_Dispose(http); CkBinData_Dispose(ocspReply); CkJsonObject_Dispose(jsonReply); return; } printf("Overall OCSP Response Status: %d\n",ocspStatus); // Let's examine the OCSP response (in JSON). CkJsonObject_putEmitCompact(jsonReply,FALSE); printf("%s\n",CkJsonObject_emit(jsonReply)); // 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 (CkJsonObject_HasMember(jsonReply,"response.cert[0].status") == TRUE) { certStatus = CkJsonObject_IntOf(jsonReply,"response.cert[0].status"); } // Possible certStatus values are: // -1: No status returned. // 0: Good // 1: Revoked // 2: Unknown. printf("Certificate Status: %d\n",certStatus); CkCert_Dispose(cert); CkPrng_Dispose(prng); CkJsonObject_Dispose(json); CkBinData_Dispose(ocspRequest); CkHttp_Dispose(http); CkBinData_Dispose(ocspReply); CkJsonObject_Dispose(jsonReply); } |
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