(Tcl) Secure FTP with Client Certificate

Chilkat FTP2 provides the ability to use a client certificate with secure FTP (implicit or explicit SSL/TLS). This example demonstrates how to load a certificate from a .pfx and use it as the client-side SSL cert. Note: Client-side certificates are only needed in situations where the server demands one.

Note: This example requires Chilkat v10.1.2 or greater.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set ftp [new_CkFtp2]

CkFtp2_put_Hostname $ftp "ftp.example.com"
CkFtp2_put_Port $ftp 21
CkFtp2_put_Username $ftp "test"
CkFtp2_put_Password $ftp "test"

# This example will use explict TLS/SSL.
# Establish an explicit secure channel after connection
# on the standard FTP port 21.
CkFtp2_put_AuthTls $ftp 1

# The Ssl property is for establishing an implicit SSL connection
# on port 990.  Because this example uses explicit SSL, it 
# should remain 0.
CkFtp2_put_Ssl $ftp 0

# Load a certificate from a .pfx
# A PFX may contain several certs, including the certificates
# in a chain of authority.
set certStore [new_CkCertStore]

set password "***"
# Load the certs from a PFX into an in-memory certificate store:
set success [CkCertStore_LoadPfxFile $certStore "chilkat.pfx" $password]
if {$success != 1} then {
    puts [CkCertStore_lastErrorText $certStore]
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    exit
}

# Find the desired certificate.
set jsonCN [new_CkJsonObject]

CkJsonObject_UpdateString $jsonCN "CN" "cert common name"

set cert [new_CkCert]

set success [CkCertStore_FindCert $certStore $jsonCN $cert]
if {$success == 0} then {
    puts "Certificate not found!"
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    delete_CkJsonObject $jsonCN
    delete_CkCert $cert
    exit
}

# Use this certificate for our secure (SSL/TLS) connection:
set success [CkFtp2_SetSslClientCert $ftp $cert]

# Connect and login to the FTP server.  The connection is 
# made secure because of the AuthTls setting.
set success [CkFtp2_Connect $ftp]
if {$success != 1} then {
    puts [CkFtp2_lastErrorText $ftp]
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    delete_CkJsonObject $jsonCN
    delete_CkCert $cert
    exit
} else {
    # LastErrorText contains information even when
    # successful. This allows you to visually verify
    # that the secure connection actually occurred.
    puts [CkFtp2_lastErrorText $ftp]
}

puts "Secure FTP Channel Established!"

# Do whatever you're doing to do ...
# upload files, download files, etc...

# .....
# .....

set success [CkFtp2_Disconnect $ftp]

delete_CkFtp2 $ftp
delete_CkCertStore $certStore
delete_CkJsonObject $jsonCN
delete_CkCert $cert