(PowerShell) FTP through SSH Tunnel

Demonstrates how to FTP through an SSH tunnel.

The Chilkat SSH tunnel object is used to create a portable SSH tunnel w/ dynamic port forwarding on a background thread that the foreground thread can use for establishing connections through an SSH tunnel.

Chilkat .NET Downloads Chilkat .NET Assemblies

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

# Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
$chilkatGlob = New-Object Chilkat.Global
$success = $chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if ($success -ne $true) {
    $($chilkatGlob.LastErrorText)
    exit
}

# This example requires Chilkat version 9.5.0.50 or greater.
$tunnel = New-Object Chilkat.SshTunnel

$sshHostname = "sftp.example.com"
$sshPort = 22

# Connect to an SSH server and establish the SSH tunnel:
$success = $tunnel.Connect($sshHostname,$sshPort)
if ($success -ne $true) {
    $($tunnel.LastErrorText)
    exit
}

# Authenticate with the SSH server via a login/password
# or with a public key.  
# This example demonstrates SSH password authentication.
$success = $tunnel.AuthenticatePw("mySshLogin","mySshPassword")
if ($success -ne $true) {
    $($tunnel.LastErrorText)
    exit
}

# Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
# with dynamic port forwarding:
$tunnel.DynamicPortForwarding = $true

# We may optionally require that connecting clients authenticate with our SOCKS proxy server.
# To do this, set an inbound username/password.  Any connecting clients would be required to 
# use SOCKS5 with the correct username/password.
# If no inbound username/password is set, then our SOCKS proxy server will accept both
# SOCKS4 and SOCKS5 unauthenticated connections.

$tunnel.InboundSocksUsername = "chilkat123"
$tunnel.InboundSocksPassword = "password123"

# Start the listen/accept thread to begin accepting SOCKS proxy client connections.
# Listen on port 1080.
$success = $tunnel.BeginAccepting(1080)
if ($success -ne $true) {
    $($tunnel.LastErrorText)
    exit
}

# Now that a background thread is running a SOCKS proxy server that forwards connections
# through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
# such as Socket, HTTP, POP3, SMTP, IMAP, FTP, etc.  The protocol may use SSL/TLS because the SSL/TLS
# will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
# connections may be routed through the SSH tunnel.

# Let's do an FTP upload through the SSH tunnel.  Both the control and data connections 
# go through the tunnel.
$ftp = New-Object Chilkat.Ftp2

$ftp.Hostname = "ftp.example.com"
$ftp.Username = "login"
$ftp.Password = "password"

# Indicate that the FTP2 object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
$ftp.SocksHostname = "localhost"
$ftp.SocksPort = 1080
$ftp.SocksVersion = 5
$ftp.SocksUsername = "chilkat123"
$ftp.SocksPassword = "password123"

# Connect to the FTP server
$success = $ftp.ConnectOnly()
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# Authenticate with the FTP server.
$success = $ftp.LoginAfterConnectOnly()
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# Change to the remote directory where the file will be uploaded.
$success = $ftp.ChangeRemoteDir("junk")
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# Upload a file.
$localPath = "/temp/hamlet.xml"
$remoteFilename = "hamlet.xml"

$success = $ftp.PutFile($localPath,$remoteFilename)
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# This closes the SSH channel within the SSH tunnel,
# and thus closes the connection with the FTP server.
$success = $ftp.Disconnect()

$("File Uploaded!")

# Stop the background listen/accept thread:
$waitForThreadExit = $true
$success = $tunnel.StopAccepting($waitForThreadExit)
if ($success -ne $true) {
    $($tunnel.LastErrorText)
    exit
}

# Close the SSH tunnel (would also kick any remaining connected clients).
$success = $tunnel.CloseTunnel($waitForThreadExit)
if ($success -ne $true) {
    $($tunnel.LastErrorText)
    exit
}