PowerShell

Upgrade an FTP Control Channel to TLS (ConvertToTls)

Demonstrates the Chilkat Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control channel to explicit TLS. It takes no arguments and is used with a manually staged connection created by ConnectOnly while Ssl is disabled.

Background: This exposes the explicit-FTPS AUTH TLS upgrade as a discrete step for the rare case where you need to do something on the clear connection first — inspect the greeting, apply a workaround — before securing it. In the normal case you simply set AuthTls and let Connect perform the upgrade automatically; this manual path exists for staged control.

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

$success = $false

#  Demonstrates the Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control
#  channel to explicit TLS.  It takes no arguments.  It is used with a manually staged connection
#  created by ConnectOnly while Ssl is disabled.

$ftp = New-Object Chilkat.Ftp2

$ftp.Hostname = "ftp.example.com"
$ftp.Port = 21

#  Connect in clear text first (Ssl is false).
$success = $ftp.ConnectOnly()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}

#  Upgrade the control channel to explicit TLS (AUTH TLS).
$success = $ftp.ConvertToTls()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}

#  Now authenticate over the encrypted control channel.
$ftp.Username = "myFtpLogin"
$ftp.Password = "myPassword"
$success = $ftp.LoginAfterConnectOnly()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}

$("Control channel upgraded to TLS and logged in.")

$success = $ftp.Disconnect()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}