CkPython

SSH Public Key Authentication

Demonstrates authenticating with an SSH server using public-key authentication. A private key is loaded into an SshKey object and passed to AuthenticatePk. The matching public key must already be installed on the server for the account.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key never leaves the client, the server merely trusts the corresponding public key, and no reusable password crosses the wire. SshKey imports several formats — OpenSSH PEM keys via FromOpenSshPrivateKey and PuTTY .ppk files via FromPuttyPrivateKey — encrypted or not. For an encrypted key, set the Password property before importing. Note that LoadText is only a convenience for reading a text file into a string; it does not itself load the key.

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import sys
import chilkat

success = False

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

#  Demonstrates authenticating with an SSH server using public-key authentication.  The matching
#  public key must already be installed on the SSH server for the account.

ssh = chilkat.CkSsh()

#  Timeouts, in milliseconds.
ssh.put_ConnectTimeoutMs(5000)
ssh.put_ReadTimeoutMs(15000)

hostname = "ssh.example.com"
port = 22
success = ssh.Connect(hostname,port)
if (success == False):
    print(ssh.lastErrorText())
    sys.exit()

#  LoadText is a convenience method that reads any text file into a string.  It does not itself
#  load the key.
key = chilkat.CkSshKey()
privKeyText = key.loadText("qa_data/my_private_key.pem")
if (key.get_LastMethodSuccess() == False):
    print(key.lastErrorText())
    sys.exit()

#  Import the private key.  Both OpenSSH and PuTTY formats are supported, encrypted or not.
#  This example loads an unencrypted OpenSSH-format key; for a PuTTY .ppk file, call
#  FromPuttyPrivateKey instead.  For an encrypted key, set key.Password before importing.
success = key.FromOpenSshPrivateKey(privKeyText)
if (success == False):
    print(key.lastErrorText())
    sys.exit()

success = ssh.AuthenticatePk("mySshLogin",key)
if (success == False):
    print(ssh.lastErrorText())
    sys.exit()

print("Public-key authentication successful.")

ssh.Disconnect()