anti
8335c5dc4c
Every service's _log() called print() then write_syslog_file() which also calls print(), causing every log line to appear twice in Docker logs. The collector streamed both copies, doubling ingested events. Removed the redundant print() from all 22 service server.py files.
112 lines
4.1 KiB
Python
112 lines
4.1 KiB
Python
#!/usr/bin/env python3
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"""
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MySQLserver.
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Sends a realistic MySQL 5.7 server handshake, reads the client login
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packet, extracts username, then closes with Access Denied. Logs auth
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attempts 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", "dbserver")
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SERVICE_NAME = "mysql"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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PORT = int(os.environ.get("PORT", "3306"))
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_MYSQL_VER = os.environ.get("MYSQL_VERSION", "5.7.38-log")
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# Minimal MySQL server greeting (protocol v10) — version string is configurable
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_GREETING = (
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b"\x0a" # protocol version 10
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+ _MYSQL_VER.encode() + b"\x00" # server version + NUL
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+ b"\x01\x00\x00\x00" # connection id = 1
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+ b"\x70\x76\x21\x6d\x61\x67\x69\x63" # auth-plugin-data part 1
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+ b"\x00" # filler
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+ b"\xff\xf7" # capability flags low
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+ b"\x21" # charset utf8
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+ b"\x02\x00" # status flags
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+ b"\xff\x81" # capability flags high
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+ b"\x15" # auth plugin data length
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+ b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" # reserved (10 bytes)
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+ b"\x21\x4f\x7d\x25\x3e\x55\x4d\x7c\x67\x75\x5e\x31\x00" # auth part 2
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+ b"mysql_native_password\x00" # auth plugin name
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)
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def _make_packet(payload: bytes, seq: int = 0) -> bytes:
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length = len(payload)
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return struct.pack("<I", length)[:3] + bytes([seq]) + payload
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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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write_syslog_file(line)
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forward_syslog(line, LOG_TARGET)
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class MySQLProtocol(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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self._greeted = False
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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(_make_packet(_GREETING, seq=0))
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self._greeted = True
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def data_received(self, data):
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self._buf += data
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# MySQL packets: 3-byte length + 1-byte seq + payload
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while len(self._buf) >= 4:
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length = struct.unpack("<I", self._buf[:3] + b"\x00")[0]
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if length > 1024 * 1024:
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self._transport.close()
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self._buf = b""
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return
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if len(self._buf) < 4 + length:
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break
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payload = self._buf[4:4 + length]
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self._buf = self._buf[4 + length:]
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self._handle_packet(payload)
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def _handle_packet(self, payload: bytes):
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if not payload:
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return
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# Login packet: capability flags (4), max_packet (4), charset (1), reserved (23), username (NUL-terminated)
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if len(payload) > 32:
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try:
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# skip capability(4) + max_pkt(4) + charset(1) + reserved(23) = 32 bytes
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username_start = 32
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nul = payload.index(b"\x00", username_start)
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username = payload[username_start:nul].decode(errors="replace")
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except (ValueError, IndexError):
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username = "<parse_error>"
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_log("auth", src=self._peer[0], username=username)
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# Send Access Denied error
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err = b"\xff" + struct.pack("<H", 1045) + b"#28000Access denied for user\x00"
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self._transport.write(_make_packet(err, seq=2))
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self._transport.close()
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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"MySQL server starting as {NODE_NAME}")
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loop = asyncio.get_running_loop()
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server = await loop.create_server(MySQLProtocol, "0.0.0.0", PORT) # 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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