(Chilkat2-Python) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

# This example assumes Chilkat Ftp2 to have been previously unlocked.
# See Unlock Ftp2 for sample code.

ftp = chilkat2.Ftp2()

ftp.Hostname = "www.authtls-ftps-server.com"
ftp.Username = "FTP_LOGIN"
ftp.Password = "FTP_PASSWORD"
ftp.AuthTls = True
ftp.Port = 21

# Connect to the FTP server using explicit TLS (AUTH TLS).
success = ftp.ConnectOnly()
if (success != True):
    print(ftp.LastErrorText)
    sys.exit()

# Get the FTP server's certificate.
# serverCert is a CkCert
serverCert = ftp.GetSslServerCert()
if (ftp.LastMethodSuccess != True):
    print(ftp.LastErrorText)
    sys.exit()

# Now that we have the certificate, we can check it in any way we desire.
# (See the online reference documentation for the certificate object's methods
# and properties)...

# Assuming the certificate is OK, proceed to authenticate with the FTP server.
success = ftp.LoginAfterConnectOnly()
if (success != True):
    print(ftp.LastErrorText)
    sys.exit()

# 
# Proceed with uploading/download files, etc...
# 

ftp.Disconnect()
print("Success.")