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)
112 lines
3.6 KiB
Python
112 lines
3.6 KiB
Python
#!/usr/bin/env python3
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"""
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MongoDBserver.
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Implements the MongoDB wire protocol OP_MSG/OP_QUERY handshake. Responds
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to isMaster/hello, listDatabases, and authenticate commands. Logs all
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received messages as JSON.
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"""
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import asyncio
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import os
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import struct
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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", "mongodb")
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SERVICE_NAME = "mongodb"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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# Minimal BSON helpers
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def _bson_str(key: str, val: str) -> bytes:
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k = key.encode() + b"\x00"
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v = val.encode() + b"\x00"
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return b"\x02" + k + struct.pack("<I", len(v)) + v
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def _bson_int32(key: str, val: int) -> bytes:
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return b"\x10" + key.encode() + b"\x00" + struct.pack("<i", val)
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def _bson_bool(key: str, val: bool) -> bytes:
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return b"\x08" + key.encode() + b"\x00" + (b"\x01" if val else b"\x00")
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def _bson_doc(*fields: bytes) -> bytes:
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body = b"".join(fields) + b"\x00"
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return struct.pack("<I", len(body) + 4) + body
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def _op_reply(request_id: int, doc: bytes) -> bytes:
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# OP_REPLY header: total_len(4), req_id(4), response_to(4), opcode(4)=1,
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# flags(4), cursor_id(8), starting_from(4), number_returned(4), docs
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header = struct.pack(
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"<iiiiiqqii",
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16 + 20 + len(doc), # total length
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0, # request id
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request_id, # response to
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1, # OP_REPLY
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0, # flags
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0, # cursor id
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0, # starting from
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1, # number returned
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)
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return header + doc
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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 MongoDBProtocol(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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def data_received(self, data):
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self._buf += data
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while len(self._buf) >= 16:
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msg_len = struct.unpack("<I", self._buf[:4])[0]
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if len(self._buf) < msg_len:
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break
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msg = self._buf[:msg_len]
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self._buf = self._buf[msg_len:]
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self._handle_message(msg)
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def _handle_message(self, msg: bytes):
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if len(msg) < 16:
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return
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request_id = struct.unpack("<I", msg[4:8])[0]
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opcode = struct.unpack("<I", msg[12:16])[0]
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_log("message", src=self._peer[0], opcode=opcode, length=len(msg))
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# Build a generic isMaster-style OK response
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reply_doc = _bson_doc(
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_bson_bool("ismaster", True),
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_bson_int32("maxWireVersion", 17),
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_bson_int32("minWireVersion", 0),
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_bson_str("version", "6.0.5"),
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_bson_int32("ok", 1),
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)
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self._transport.write(_op_reply(request_id, reply_doc))
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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"MongoDB server starting as {NODE_NAME}")
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loop = asyncio.get_running_loop()
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server = await loop.create_server(MongoDBProtocol, "0.0.0.0", 27017) # 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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