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Tcl Examples

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(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.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

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 {[expr [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 {[expr [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 {[expr $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 {[expr [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

 

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