(Ruby) 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 Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

http = Chilkat::CkHttp.new()

# We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
# sslCert is a CkCert
sslCert = http.GetServerSslCert("nationalgeographic.com",443)
if (http.get_LastMethodSuccess() == false)
    print http.lastErrorText() + "\n";
    exit
end

# 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.
# certChain is a CkCertChain
certChain = sslCert.GetCertChain()
if (sslCert.get_LastMethodSuccess() == false)
    print sslCert.lastErrorText() + "\n";

    exit
end

i = 0
numCerts = certChain.get_NumCerts()
while i < numCerts
    # cert is a CkCert
    cert = certChain.GetCert(i)
    print "SubjectDN " + i.to_s() + ": " + cert.subjectDN() + "\n";
    print "IssuerDN " + i.to_s() + ": " + cert.issuerDN() + "\n";

    i = i + 1
end

# If the certificate chain reaches the root CA cert, then the last cert in the chain
# is the root CA cert.
if (certChain.get_ReachesRoot() == true)
    # caCert is a CkCert
    caCert = certChain.GetCert(numCerts - 1)
    print "CA Root Cert: " + caCert.subjectDN() + "\n";

end