Tcl

SSH Public Key Authentication

See more SSH Examples

Demonstrates how to authenticate with an SSH server using public key authentication. Tcl

load ./chilkat.dll

set success 0

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

set ssh [new_CkSsh]

# Set some timeouts, in milliseconds:
CkSsh_put_ConnectTimeoutMs $ssh 5000
CkSsh_put_IdleTimeoutMs $ssh 15000

# Connect to the SSH server.  
# The standard SSH port = 22
# The hostname may be a hostname or IP address.
set hostname "sftp.example.com"
set port 22
set success [CkSsh_Connect $ssh $hostname $port]
if {$success != 1} then {
    puts [CkSsh_lastErrorText $ssh]
    delete_CkSsh $ssh
    exit
}

set key [new_CkSshKey]

# Read the PEM file into a string variable:
# (This does not load the PEM file into the key.  The LoadText
# method is a convenience method for loading the full contents of ANY text
# file into a string variable.)
set privKey [CkSshKey_loadText $key "myPrivateKey.pem"]
if {[CkSshKey_get_LastMethodSuccess $key] != 1} then {
    puts [CkSshKey_lastErrorText $key]
    delete_CkSsh $ssh
    delete_CkSshKey $key
    exit
}

# Load a private key from a PEM string:
# (Private keys may be loaded from OpenSSH and Putty formats.
# Both encrypted and unencrypted private key file formats
# are supported.  This example loads an unencrypted private
# key in OpenSSH format.  PuTTY keys typically use the .ppk
# file extension, while OpenSSH keys use the PEM format.
# (For PuTTY keys, call FromPuttyPrivateKey instead.)
set success [CkSshKey_FromOpenSshPrivateKey $key $privKey]
if {$success != 1} then {
    puts [CkSshKey_lastErrorText $key]
    delete_CkSsh $ssh
    delete_CkSshKey $key
    exit
}

# Authenticate with the SSH server using the login and
# private key.  (The corresponding public key should've 
# been installed on the SSH server beforehand.)
set success [CkSsh_AuthenticatePk $ssh "myLogin" $key]
if {$success != 1} then {
    puts [CkSsh_lastErrorText $ssh]
    delete_CkSsh $ssh
    delete_CkSshKey $key
    exit
}

puts [CkSsh_lastErrorText $ssh]
puts "Public-Key Authentication Successful!"

delete_CkSsh $ssh
delete_CkSshKey $key