(Tcl) 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.

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load ./chilkat.dll

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

set http [new_CkHttp]

# We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
# sslCert is a CkCert
set sslCert [CkHttp_GetServerSslCert $http "nationalgeographic.com" 443]
if {[CkHttp_get_LastMethodSuccess $http] == 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    exit
}

# 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
set certChain [CkCert_GetCertChain $sslCert]
if {[CkCert_get_LastMethodSuccess $sslCert] == 0} then {
    puts [CkCert_lastErrorText $sslCert]
    delete_CkCert $sslCert

    delete_CkHttp $http
    exit
}

set i 0
set numCerts [CkCertChain_get_NumCerts $certChain]
while {$i < $numCerts} {
    # cert is a CkCert
    set cert [CkCertChain_GetCert $certChain $i]
    puts "SubjectDN $i: [CkCert_subjectDN $cert]"
    puts "IssuerDN $i: [CkCert_issuerDN $cert]"
    delete_CkCert $cert

    set i [expr $i + 1]
}

# If the certificate chain reaches the root CA cert, then the last cert in the chain
# is the root CA cert.
if {[CkCertChain_get_ReachesRoot $certChain] == 1} then {
    # caCert is a CkCert
    set caCert [CkCertChain_GetCert $certChain [expr $numCerts - 1]]
    puts "CA Root Cert: [CkCert_subjectDN $caCert]"
    delete_CkCert $caCert

}

delete_CkCert $sslCert

delete_CkCertChain $certChain


delete_CkHttp $http