78 lines
3.0 KiB
Python
78 lines
3.0 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 pathlib import Path
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from twisted.internet import defer, reactor
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from twisted.protocols.ftp import FTP, FTPFactory, FTPAnonymousShell
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from twisted.python.filepath import FilePath
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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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PORT = int(os.environ.get("PORT", "21"))
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BANNER = os.environ.get("FTP_BANNER", "220 (vsFTPd 3.0.3)")
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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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def _setup_bait_fs() -> str:
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bait_dir = Path("/tmp/ftp_bait")
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bait_dir.mkdir(parents=True, exist_ok=True)
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(bait_dir / "backup.tar.gz").write_bytes(b"\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x03\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00")
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(bait_dir / "db_dump.sql").write_text("CREATE TABLE users (id INT, username VARCHAR(50), password VARCHAR(50));\nINSERT INTO users VALUES (1, 'admin', 'pbkdf2:sha256:5000$...');\n")
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(bait_dir / "config.ini").write_text("[database]\nuser = dbadmin\npassword = db_super_admin_pass_!\nhost = localhost\n")
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(bait_dir / "credentials.txt").write_text("admin:super_secret_admin_pw\nroot:toor\nalice:wonderland\n")
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return str(bait_dir)
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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 honeypot server
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self.state = self.AUTHED
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self._user = getattr(self, "_server_user", "anonymous")
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self.shell = FTPAnonymousShell(FilePath(_setup_bait_fs()))
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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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return super().ftp_RETR(path)
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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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welcomeMessage = BANNER
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if __name__ == "__main__":
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twisted_log.startLoggingWithObserver(lambda e: None, setStdout=False)
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_log("startup", msg=f"FTP server starting as {NODE_NAME} on port {PORT}")
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reactor.listenTCP(PORT, ServerFTPFactory())
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reactor.run()
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