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68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
#!/usr/bin/env python3
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"""
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FTP server using Twisted's FTP server infrastructure.
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Accepts any credentials, logs all commands and file requests,
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forwards events as JSON to LOG_TARGET if set.
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"""
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import os
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import sys
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from twisted.internet import defer, reactor
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from twisted.protocols.ftp import FTP, FTPFactory
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from twisted.python import log as twisted_log
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from decnet_logging import syslog_line, write_syslog_file, forward_syslog
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NODE_NAME = os.environ.get("NODE_NAME", "ftpserver")
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SERVICE_NAME = "ftp"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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def _log(event_type: str, severity: int = 6, **kwargs) -> None:
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line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
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print(line, flush=True)
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write_syslog_file(line)
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forward_syslog(line, LOG_TARGET)
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class ServerFTP(FTP):
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def connectionMade(self):
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peer = self.transport.getPeer()
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_log("connection", src_ip=peer.host, src_port=peer.port)
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super().connectionMade()
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def ftp_USER(self, username):
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self._server_user = username
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_log("user", username=username)
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return super().ftp_USER(username)
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def ftp_PASS(self, password):
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_log("auth_attempt", username=getattr(self, "_server_user", "?"), password=password)
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# Accept everything — we're a server
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self.state = self.AUTHED
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self._user = getattr(self, "_server_user", "anonymous")
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return defer.succeed((230, "Login successful."))
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def ftp_RETR(self, path):
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_log("download_attempt", path=path)
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self.sendLine(b"550 File unavailable.")
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return defer.succeed(None)
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def connectionLost(self, reason):
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peer = self.transport.getPeer()
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_log("disconnect", src_ip=peer.host, src_port=peer.port)
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super().connectionLost(reason)
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class ServerFTPFactory(FTPFactory):
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protocol = ServerFTP
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if __name__ == "__main__":
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twisted_log.startLogging(sys.stdout)
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_log("startup", msg=f"FTP server starting as {NODE_NAME} on port 21")
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reactor.listenTCP(21, ServerFTPFactory())
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reactor.run()
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