(C) 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.

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#include <C_CkGlobal.h>
#include <C_CkHttp.h>
#include <C_CkTrustedRoots.h>

void ChilkatSample(void)
    {
    HCkGlobal chilkatGlob;
    BOOL success;
    const char *url;
    HCkHttp http;
    const char *html;
    HCkTrustedRoots trustedRoots;

    // 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.
    chilkatGlob = CkGlobal_Create();
    success = CkGlobal_UnlockBundle(chilkatGlob,"Anything for 30-day trial.");
    if (success != TRUE) {
        printf("%s\n",CkGlobal_lastErrorText(chilkatGlob));
        CkGlobal_Dispose(chilkatGlob);
        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.
    url = "https://animals.nationalgeographic.com/animals/invertebrates/starfish/";

    http = CkHttp_Create();

    //  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.
    CkHttp_putRequireSslCertVerify(http,TRUE);

    //  Do the HTTPS page fetch (through the SSH tunnel)
    html = CkHttp_quickGetStr(http,url);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkGlobal_Dispose(chilkatGlob);
        CkHttp_Dispose(http);
        return;
    }

    printf("The HTTP GET was successful.\n");

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

    //  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.)
    CkTrustedRoots_putTrustSystemCaRoots(trustedRoots,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 = CkTrustedRoots_Activate(trustedRoots);

    //  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 = CkHttp_CloseAllConnections(http);

    //  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 = CkHttp_quickGetStr(http,url);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        printf("Good, the HTTP request failed as expected.\n");
    }
    else {
        printf("%s\n",CkHttp_lastErrorText(http));
        printf("Hmmm... we did not fail as expected?\n");
    }



    CkGlobal_Dispose(chilkatGlob);
    CkHttp_Dispose(http);
    CkTrustedRoots_Dispose(trustedRoots);

    }