Simple FTP server that accepts any credentials and logs the to stdout

custom_ftp.py

from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
from pyftpdlib.log import logger

HOMEDIR = "/var/ftp"

# Authorizer granting access to everyone and logging the credentials
class LoggingAuthorizer(DummyAuthorizer):
    def validate_authentication(self, username, password, handler):
        # Add user on the fly if it does not exist yet
        if not self.has_user(username):
            self.add_user(username, password, HOMEDIR, perm="elradfmwMT")
        # Log the credentials
        logger.info('LOGIN User: "%s" - Password: "%s"' % (username, password))

authorizer = LoggingAuthorizer()

handler = FTPHandler
handler.authorizer = authorizer

server = FTPServer(("0.0.0.0", 2121), handler)
server.serve_forever()