anti
55896b0caa
- decnet/logging/syslog_formatter.py: RFC 5424 formatter (local0 facility, decnet@55555 SD element ID, full escaping per §6.3.3) - decnet/logging/file_handler.py: rotating file handler (10 MB / 5 backups), path configurable via DECNET_LOG_FILE env var - templates/decnet_logging.py: combined syslog_line / write_syslog_file / forward_syslog helper distributed to all 22 service template dirs - All templates/*/server.py: replaced ad-hoc JSON _forward/_log with RFC 5424 syslog_line + write_syslog_file + forward_syslog - All templates/*/Dockerfile: COPY decnet_logging.py /opt/ - DecnetConfig: added log_file field; CLI: --log-file flag; composer injects DECNET_LOG_FILE env var into service containers - tests/test_syslog_formatter.py + tests/test_file_handler.py: 25 new tests Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
87 lines
2.9 KiB
Python
87 lines
2.9 KiB
Python
#!/usr/bin/env python3
|
|
"""
|
|
IMAPserver.
|
|
Presents an IMAP4rev1 banner, captures LOGIN credentials (plaintext and
|
|
AUTHENTICATE), then returns a NO response. Logs all commands as JSON.
|
|
"""
|
|
|
|
import asyncio
|
|
import json
|
|
import os
|
|
import socket
|
|
from datetime import datetime, timezone
|
|
from decnet_logging import syslog_line, write_syslog_file, forward_syslog
|
|
|
|
NODE_NAME = os.environ.get("NODE_NAME", "mailserver")
|
|
SERVICE_NAME = "imap"
|
|
LOG_TARGET = os.environ.get("LOG_TARGET", "")
|
|
BANNER = f"* OK [{NODE_NAME}] IMAP4rev1 Service Ready\r\n"
|
|
|
|
|
|
|
|
|
|
def _log(event_type: str, severity: int = 6, **kwargs) -> None:
|
|
line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
|
|
print(line, flush=True)
|
|
write_syslog_file(line)
|
|
forward_syslog(line, LOG_TARGET)
|
|
|
|
|
|
class IMAPProtocol(asyncio.Protocol):
|
|
def __init__(self):
|
|
self._transport = None
|
|
self._peer = None
|
|
self._buf = b""
|
|
|
|
def connection_made(self, transport):
|
|
self._transport = transport
|
|
self._peer = transport.get_extra_info("peername", ("?", 0))
|
|
_log("connect", src=self._peer[0], src_port=self._peer[1])
|
|
transport.write(BANNER.encode())
|
|
|
|
def data_received(self, data):
|
|
self._buf += data
|
|
while b"\n" in self._buf:
|
|
line, self._buf = self._buf.split(b"\n", 1)
|
|
self._handle_line(line.decode(errors="replace").strip())
|
|
|
|
def _handle_line(self, line: str):
|
|
parts = line.split(None, 2)
|
|
if not parts:
|
|
return
|
|
tag = parts[0]
|
|
cmd = parts[1].upper() if len(parts) > 1 else ""
|
|
args = parts[2] if len(parts) > 2 else ""
|
|
|
|
if cmd == "LOGIN":
|
|
creds = args.split(None, 1)
|
|
username = creds[0].strip('"') if creds else ""
|
|
password = creds[1].strip('"') if len(creds) > 1 else ""
|
|
_log("auth", src=self._peer[0], username=username, password=password)
|
|
self._transport.write(f"{tag} NO [AUTHENTICATIONFAILED] Invalid credentials\r\n".encode())
|
|
elif cmd == "CAPABILITY":
|
|
self._transport.write(b"* CAPABILITY IMAP4rev1 AUTH=PLAIN AUTH=LOGIN\r\n")
|
|
self._transport.write(f"{tag} OK CAPABILITY completed\r\n".encode())
|
|
elif cmd == "LOGOUT":
|
|
self._transport.write(b"* BYE IMAP4rev1 Server logging out\r\n")
|
|
self._transport.write(f"{tag} OK LOGOUT completed\r\n".encode())
|
|
self._transport.close()
|
|
else:
|
|
_log("command", src=self._peer[0], cmd=line[:128])
|
|
self._transport.write(f"{tag} BAD Command not recognized\r\n".encode())
|
|
|
|
def connection_lost(self, exc):
|
|
_log("disconnect", src=self._peer[0] if self._peer else "?")
|
|
|
|
|
|
async def main():
|
|
_log("startup", msg=f"IMAP server starting as {NODE_NAME}")
|
|
loop = asyncio.get_running_loop()
|
|
server = await loop.create_server(IMAPProtocol, "0.0.0.0", 143)
|
|
async with server:
|
|
await server.serve_forever()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
asyncio.run(main())
|