CkPython

SSH Tunnel Authenticate with Password and Private Key

Demonstrates the Chilkat SshTunnel.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security deployments mandate two-factor SSH. This method satisfies that policy in one call, combining something you know (the password) with something you have (the key). The password should come from a secure source rather than a literal.

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import sys
import chilkat

success = False

#  Demonstrates the SshTunnel.AuthenticatePwPk method, which authenticates with an SSH server that
#  requires BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
#  password, and the 3rd is an SshKey private key.

tunnel = chilkat.CkSshTunnel()

#  The tunnel forwards accepted local connections to this destination through the SSH server.
tunnel.put_DestHostname("db.internal.example.com")
tunnel.put_DestPort(5432)

#  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
#  does not authenticate yet.
sshPort = 22
success = tunnel.Connect("ssh.example.com",sshPort)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
password = "mySshPassword"

#  Load the SSH private key.  LoadText reads the file's text, which is then imported.
privKey = chilkat.CkSshKey()
keyText = privKey.loadText("qa_data/id_rsa")
if (privKey.get_LastMethodSuccess() == False):
    print(privKey.lastErrorText())
    sys.exit()

success = privKey.FromOpenSshPrivateKey(keyText)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

success = tunnel.AuthenticatePwPk("mySshLogin",password,privKey)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

print("Authenticated with a password and a private key.")

#  After authenticating, call BeginAccepting to start listening for local connections to forward.

waitForThreadExit = True
success = tunnel.CloseTunnel(waitForThreadExit)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()