Use Paramiko AutoAddPolicy with pysftp

Question

This code is not working:

def sftp_connection(self):
    import pysftp
    connection = pysftp.Connection(self.host, username=self.system_name,
                      


        

Answer 1

pysftp does not use Paramiko SSHClient class at all, it uses more low-level Transport class. So it does not have the MissingHostKeyPolicy functionality of SSHClient.

You would have to implement it on your own.

One possible implementation can be:

host = 'example.com'

# Loads .ssh/known_hosts    
cnopts = CnOpts()

hostkeys = None

if cnopts.hostkeys.lookup(host) == None:
    print("New host - will accept any host key")
    # Backup loaded .ssh/known_hosts file
    hostkeys = cnopts.hostkeys
    # And do not verify host key of the new host
    cnopts.hostkeys = None

with Connection(host, username=user, private_key=pkey, cnopts=cnopts) as sftp:
    if hostkeys != None:
        print("Connected to new host, caching its hostkey")
        hostkeys.add(host, sftp.remote_server_key.get_name(), sftp.remote_server_key)
        hostkeys.save(pysftp.helpers.known_hosts())