C

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. C

#include <C_CkPkcs11.h>
#include <C_CkCert.h>
#include <C_CkHttp.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPkcs11 pkcs11;
    int slotID;
    BOOL readWrite;
    int userType;
    const char *pin;
    HCkCert cert;
    HCkHttp http;
    const char *responseBody;

    success = FALSE;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    pkcs11 = CkPkcs11_Create();

    // Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
    // or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
    CkPkcs11_putSharedLibPath(pkcs11,"C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll");

    success = CkPkcs11_Initialize(pkcs11);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        CkPkcs11_Dispose(pkcs11);
        return;
    }

    // Pass -1 for the slotID to open a session on the first non-empty slot.
    slotID = -1;

    // Open a session.
    readWrite = TRUE;
    success = CkPkcs11_OpenSession(pkcs11,slotID,readWrite);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        CkPkcs11_Dispose(pkcs11);
        return;
    }

    // Make it an authenticated session by calling Login.
    // 
    // If we don't authenticate, then we won't be able to see the private keys, and thus
    // we won't know which certificates have an associated private key stored on the smart card.

    // The smart card PIN is passed to the Login method.
    // userType 1 indicates a "Normal User".
    userType = 1;
    pin = "0000";
    success = CkPkcs11_Login(pkcs11,userType,pin);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        return;
    }

    cert = CkCert_Create();

    // Find a certificate by the Subject Common Name
    success = CkPkcs11_FindCert(pkcs11,"subjectCN","BadSSL Client Certificate",cert);
    if (success == TRUE) {
        printf("Found: %s\n",CkCert_subjectCN(cert));
    }
    else {
        printf("Not found: %s\n",CkCert_subjectCN(cert));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        return;
    }

    printf("Successfully loaded the cert object from the smart card / USB token.\n");

    // Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
    // The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

    // ------------------------------------------------------------------------------------------------------------

    // Send an HTTPS request to https://client.badssl.com
    // https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
    // The client certificate can be downloaded from https://badssl.com/download/.
    // This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

    http = CkHttp_Create();

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    success = CkHttp_SetSslClientCert(http,cert);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    responseBody = CkHttp_quickGetStr(http,"https://client.badssl.com/");
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    printf("Response status code: %d\n",CkHttp_getLastStatus(http));
    printf("Response body: \n");
    printf("%s\n",responseBody);

    // ------------------------------------------------------------------------------------------------------------
    // Revert to an unauthenticated session by calling Logout.
    success = CkPkcs11_Logout(pkcs11);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = CkPkcs11_CloseSession(pkcs11);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    printf("Success.\n");


    CkPkcs11_Dispose(pkcs11);
    CkCert_Dispose(cert);
    CkHttp_Dispose(http);

    }