(Visual FoxPro) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL loSslCert
LOCAL loCertChain
LOCAL i
LOCAL lnNumCerts
LOCAL loCert
LOCAL loCaCert

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

* We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
loSslCert = loHttp.GetServerSslCert("nationalgeographic.com",443)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    CANCEL
ENDIF

* Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
* be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
* will be returned.  The certificate chain's ReachesRoot property can be examined to 
* see if the chain was completed to the root.
loCertChain = loSslCert.GetCertChain()
IF (loSslCert.LastMethodSuccess = 0) THEN
    ? loSslCert.LastErrorText
    RELEASE loSslCert
    RELEASE loHttp
    CANCEL
ENDIF

i = 0
lnNumCerts = loCertChain.NumCerts
DO WHILE i < lnNumCerts
    loCert = loCertChain.GetCert(i)
    ? "SubjectDN " + STR(i) + ": " + loCert.SubjectDN
    ? "IssuerDN " + STR(i) + ": " + loCert.IssuerDN
    RELEASE loCert
    i = i + 1
ENDDO

* If the certificate chain reaches the root CA cert, then the last cert in the chain
* is the root CA cert.
IF (loCertChain.ReachesRoot = 1) THEN
    loCaCert = loCertChain.GetCert(lnNumCerts - 1)
    ? "CA Root Cert: " + loCaCert.SubjectDN
    RELEASE loCaCert
ENDIF

RELEASE loSslCert
RELEASE loCertChain

RELEASE loHttp