B4X

HTTP - Verify Server is a Trusted Root CA

See more HTTP Examples

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. B4X

Dim success As Boolean = False

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

success = False

'   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.
Dim url As String = "https://animals.nationalgeographic.com/animals/invertebrates/starfish/"

Dim http As ChilkatHttp
http.Initialize("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.RequireSslCertVerify = True

'   Do the HTTPS page fetch (through the SSH tunnel)
Dim html As String = http.QuickGetStr(url)
If http.LastMethodSuccess <> True Then
    Log(http.LastErrorText)
    Return
End If


Log("The HTTP GET was successful.")

'   Now let's require that HTTP requests to SSL/TLS servers that don't have trusted CA roots
'   should fail.
Dim trustedRoots As ChilkatTrustedRoots
trustedRoots.Initialize("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.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.LastMethodSuccess <> True Then
    Log(http.LastErrorText)
    Log("Good, the HTTP request failed as expected.")
Else
    Log(http.LastErrorText)
    Log("Hmmm... we did not fail as expected?")
End If