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(Tcl) HTTP - Verify Server is a Trusted Root CA

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.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
#  by calling UnlockBundle.  It requires a Bundle unlock code.
set chilkatGlob [new_CkGlobal]

set success [CkGlobal_UnlockBundle $chilkatGlob "Anything for 30-day trial."]
if {[expr $success != 1]} then {
    puts [CkGlobal_lastErrorText $chilkatGlob]
    delete_CkGlobal $chilkatGlob
    exit
}

#   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.
set url "https://animals.nationalgeographic.com/animals/invertebrates/starfish/"

set http [new_CkHttp]

#   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.
CkHttp_put_RequireSslCertVerify $http 1

#   Do the HTTPS page fetch (through the SSH tunnel)
set html [CkHttp_quickGetStr $http $url]
if {[expr [CkHttp_get_LastMethodSuccess $http] != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkGlobal $chilkatGlob
    delete_CkHttp $http
    exit
}

puts "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.
set trustedRoots [new_CkTrustedRoots]

#   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.)
CkTrustedRoots_put_TrustSystemCaRoots $trustedRoots 1

#   Activate the trusted roots globally for all Chilkat objects.
#   This call really shouldn't fail, so we're not checking the return value.
set success [CkTrustedRoots_Activate $trustedRoots]

#   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.
set success [CkHttp_CloseAllConnections $http]

#   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..)
set html [CkHttp_quickGetStr $http $url]
if {[expr [CkHttp_get_LastMethodSuccess $http] != 1]} then {
    puts [CkHttp_lastErrorText $http]
    puts "Good, the HTTP request failed as expected."
} else {
    puts [CkHttp_lastErrorText $http]
    puts "Hmmm... we did not fail as expected?"
}


delete_CkGlobal $chilkatGlob
delete_CkHttp $http
delete_CkTrustedRoots $trustedRoots

 

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