(Tcl) Using WS_FTP Self-signed Certificate file (.crt) and Private Key File. (.key)

Demonstrates how to use a self-signed certificate created by WS_FTP with Chilkat FTP2.

Note: It is usually not necessary for the FTP client to use a client-side certificate. Most FTP servers using SSL and TLS connections (explicit or implicit) do not require client-side certs. In addition, some high-security FTP servers require "real" certificates -- meaning certificates issued by a real certificate authority with a chain of authentication that leads to a trusted root certificate. The certificates created by WS_FTP are self-signed and untrusted.

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load ./chilkat.dll

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

# Important:  Before running this program, convert your
# .crt and .key files to a .p12 using OpenSSL:
# The command is this:
# openssl pkcs12 -export -in test.crt -inkey test.key -out test.p12
# 

set ftp [new_CkFtp2]

CkFtp2_put_Hostname $ftp "ftp.***.com"
CkFtp2_put_Port $ftp 21
CkFtp2_put_Username $ftp "testLogin"
CkFtp2_put_Password $ftp "testPassword"

# 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

# Create an instance of a certificate store object, load a .p12 file,
# locate the certificate we need, and use it for signing.
# (a P12/PFX file may contain more than one certificate.)
set certStore [new_CkCertStore]

# The 1st argument is the filename, the 2nd arg is the 
# .p12 file's password.  (OpenSSL will prompty you to set a password
# when converting the .crt and .key into a .p12).
set success [CkCertStore_LoadPfxFile $certStore "test.p12" "secret"]
if {$success != 1} then {
    puts [CkCertStore_lastErrorText $certStore]
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    exit
}

# cert is a CkCert
set cert [CkCertStore_FindCertBySubjectCN $certStore "Your cert's common name"]
if {[CkCertStore_get_LastMethodSuccess $certStore] == 0} then {
    puts [CkCertStore_lastErrorText $certStore]
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    exit
}

set success [CkFtp2_SetSslClientCert $ftp $cert]

delete_CkCert $cert

# Connect and login to the FTP server.
set success [CkFtp2_Connect $ftp]
if {$success != 1} then {
    puts [CkFtp2_lastErrorText $ftp]
    delete_CkFtp2 $ftp
    delete_CkCertStore $certStore
    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!"
puts [CkFtp2_lastErrorText $ftp]

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

# ...
# ...

set success [CkFtp2_Disconnect $ftp]

delete_CkFtp2 $ftp
delete_CkCertStore $certStore