(PowerShell) 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.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$ftp = New-Object Chilkat.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 -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# Get the FTP server's certificate.
$serverCert = $ftp.GetSslServerCert()
if ($ftp.LastMethodSuccess -ne $true) {
    $($ftp.LastErrorText)
    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 -ne $true) {
    $($ftp.LastErrorText)
    exit
}

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

$ftp.Disconnect()
$("Success.")