anti
24f02c3466
- Add # nosec B104 to all intentional 0.0.0.0 binds in honeypot servers (hardcoded_bind_all_interfaces is by design — deckies must accept attacker connections) - Add # nosec B101 to assert statements used for protocol validation in ldap/snmp - Add # nosec B105 to fake SASL placeholder in ldap - Add # nosec B108 to /tmp usage in smb template - Exclude root-owned auto-generated decnet_logging.py copies from bandit scan via pyproject.toml [tool.bandit] config (synced by _sync_logging_helper at deploy)
84 lines
2.9 KiB
Python
84 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""
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IMAPserver.
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Presents an IMAP4rev1 banner, captures LOGIN credentials (plaintext and
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AUTHENTICATE), then returns a NO response. Logs all commands as JSON.
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"""
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import asyncio
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import os
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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", "mailserver")
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SERVICE_NAME = "imap"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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BANNER = f"* OK [{NODE_NAME}] IMAP4rev1 Service Ready\r\n"
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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 IMAPProtocol(asyncio.Protocol):
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def __init__(self):
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self._transport = None
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self._peer = None
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self._buf = b""
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def connection_made(self, transport):
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self._transport = transport
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self._peer = transport.get_extra_info("peername", ("?", 0))
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_log("connect", src=self._peer[0], src_port=self._peer[1])
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transport.write(BANNER.encode())
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def data_received(self, data):
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self._buf += data
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while b"\n" in self._buf:
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line, self._buf = self._buf.split(b"\n", 1)
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self._handle_line(line.decode(errors="replace").strip())
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def _handle_line(self, line: str):
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parts = line.split(None, 2)
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if not parts:
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return
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tag = parts[0]
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cmd = parts[1].upper() if len(parts) > 1 else ""
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args = parts[2] if len(parts) > 2 else ""
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if cmd == "LOGIN":
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creds = args.split(None, 1)
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username = creds[0].strip('"') if creds else ""
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password = creds[1].strip('"') if len(creds) > 1 else ""
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_log("auth", src=self._peer[0], username=username, password=password)
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self._transport.write(f"{tag} NO [AUTHENTICATIONFAILED] Invalid credentials\r\n".encode())
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elif cmd == "CAPABILITY":
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self._transport.write(b"* CAPABILITY IMAP4rev1 AUTH=PLAIN AUTH=LOGIN\r\n")
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self._transport.write(f"{tag} OK CAPABILITY completed\r\n".encode())
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elif cmd == "LOGOUT":
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self._transport.write(b"* BYE IMAP4rev1 Server logging out\r\n")
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self._transport.write(f"{tag} OK LOGOUT completed\r\n".encode())
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self._transport.close()
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else:
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_log("command", src=self._peer[0], cmd=line[:128])
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self._transport.write(f"{tag} BAD Command not recognized\r\n".encode())
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def connection_lost(self, exc):
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_log("disconnect", src=self._peer[0] if self._peer else "?")
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async def main():
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_log("startup", msg=f"IMAP server starting as {NODE_NAME}")
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loop = asyncio.get_running_loop()
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server = await loop.create_server(IMAPProtocol, "0.0.0.0", 143) # nosec B104
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async with server:
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await server.serve_forever()
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if __name__ == "__main__":
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asyncio.run(main())
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