(MFC) HTTP - Verify Server is a Trusted Root CA

Demonstrates how to only allow connections to an HTTP server having a certificate with a root that is in our list of trusted CA root certificates.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkGlobal.h>
#include <CkHttp.h>
#include <CkTrustedRoots.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob;
    bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        strOut.append(chilkatGlob.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  On my particular system, the root CA cert for this URL is not pre-installed.
    //  Note: This may be different for you.
    //  Also, this example was written on 29-May-2015.  This URL was valid at the time,
    //  but may not be valid at a future date.
    const char *url = "https://animals.nationalgeographic.com/animals/invertebrates/starfish/";

    CkHttp http;

    //  Require that the SSL/TLS server certificate is not expired,
    //  and that the certificate signature is valid.
    //  This does not ensure that it has a chain of authentication to
    //  a trusted root.  To ensure that, the TrustedRoots object (below) is required.
    http.put_RequireSslCertVerify(true);

    //  Do the HTTPS page fetch (through the SSH tunnel)
    const char *html = http.quickGetStr(url);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("The HTTP GET was successful.");
    strOut.append("\r\n");

    //  Now let's require that HTTP requests to SSL/TLS servers that don't have trusted CA roots
    //  should fail.
    CkTrustedRoots trustedRoots;

    //  Indicate that we will trust any pre-installed certificates on this system.
    //  (The meaning of pre-installed certificates depends on the operating system, and in
    //  some environments there is no such thing as pre-installed certificates.  See the reference
    //  documentation for the TrustedRoots class.)
    trustedRoots.put_TrustSystemCaRoots(true);

    //  Activate the trusted roots globally for all Chilkat objects.
    //  This call really shouldn't fail, so we're not checking the return value.
    success = trustedRoots.Activate();

    //  Given that our previous HTTP GET likely kept the connection open,
    //  make sure that all HTTP connections are closed before re-trying.
    //  Otherwise, we'll simply be re-using the pre-existing connection.
    success = http.CloseAllConnections();

    //  Now let's try fetching the URL again.  It should fail this time because
    //  there is a requirement that the SSL/TLS server certificate must have a trusted root,
    //  and the trusted root for this URL is not installed on my system (but may be different for you..)
    html = http.quickGetStr(url);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        strOut.append("Good, the HTTP request failed as expected.");
        strOut.append("\r\n");
    }
    else {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        strOut.append("Hmmm... we did not fail as expected?");
        strOut.append("\r\n");
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }