feat: stealth connect with random identity and probation window
Register with a fully random nick, user, and realname (no fixed pattern) to avoid fingerprinting. Enter a 15s probation period after registration -- if the server k-lines, reconnect with a fresh identity. Only after surviving probation: switch to the configured nick and join channels. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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user
@@ -11,13 +11,15 @@ replay_on_connect = true
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host = "127.0.0.1"
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port = 1080
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# Registration uses a random nick and generic ident/realname.
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# After surviving the probation window (no k-line), the bouncer
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# switches to your configured nick and joins channels.
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[networks.libera]
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host = "irc.libera.chat"
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port = 6697
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tls = true
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nick = "mynick"
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user = "mynick"
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realname = "bouncer user"
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channels = ["#test"]
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autojoin = true
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@@ -4,6 +4,9 @@ from __future__ import annotations
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import asyncio
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import logging
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import random
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import string
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from enum import Enum, auto
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from typing import Callable
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from bouncer.config import NetworkConfig, ProxyConfig
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@@ -12,6 +15,43 @@ from bouncer.irc import IRCMessage, parse
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log = logging.getLogger(__name__)
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BACKOFF_STEPS = [5, 10, 30, 60, 120, 300]
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PROBATION_SECONDS = 15
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class State(Enum):
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"""Network connection state."""
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DISCONNECTED = auto()
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CONNECTING = auto()
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REGISTERING = auto()
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PROBATION = auto()
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READY = auto()
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def _random_nick() -> str:
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"""Generate a nick that looks like a typical human-chosen IRC nick."""
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# Mix of patterns seen on real IRC networks
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length = random.randint(6, 10)
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# Start with a letter, rest is alphanumeric
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first = random.choice(string.ascii_lowercase)
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rest = "".join(random.choices(string.ascii_lowercase + string.digits, k=length - 1))
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return first + rest
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def _random_user() -> str:
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"""Generate a generic-looking ident."""
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length = random.randint(4, 8)
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first = random.choice(string.ascii_lowercase)
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rest = "".join(random.choices(string.ascii_lowercase, k=length - 1))
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return first + rest
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def _random_realname() -> str:
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"""Generate a plausible realname."""
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length = random.randint(4, 8)
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first = random.choice(string.ascii_uppercase)
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rest = "".join(random.choices(string.ascii_lowercase, k=length - 1))
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return first + rest
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class Network:
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@@ -28,17 +68,33 @@ class Network:
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self.on_message = on_message
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self.nick: str = cfg.nick
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self.channels: set[str] = set()
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self.connected: bool = False
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self.registered: bool = False
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self.state: State = State.DISCONNECTED
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self._reader: asyncio.StreamReader | None = None
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self._writer: asyncio.StreamWriter | None = None
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self._reconnect_attempt: int = 0
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self._running: bool = False
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self._read_task: asyncio.Task[None] | None = None
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self._probation_task: asyncio.Task[None] | None = None
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# Transient nick used during registration/probation
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self._connect_nick: str = ""
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# Visible hostname reported by server
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self.visible_host: str | None = None
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# Channel state: topic + names per channel
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self.topics: dict[str, str] = {}
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self.names: dict[str, set[str]] = {}
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@property
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def connected(self) -> bool:
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return self.state not in (State.DISCONNECTED, State.CONNECTING)
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@property
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def registered(self) -> bool:
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return self.state in (State.PROBATION, State.READY)
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@property
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def ready(self) -> bool:
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return self.state == State.READY
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async def start(self) -> None:
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"""Start the network connection loop."""
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self._running = True
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@@ -49,6 +105,8 @@ class Network:
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self._running = False
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if self._read_task and not self._read_task.done():
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self._read_task.cancel()
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if self._probation_task and not self._probation_task.done():
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self._probation_task.cancel()
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await self._disconnect()
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async def send(self, msg: IRCMessage) -> None:
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@@ -62,9 +120,13 @@ class Network:
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await self.send(IRCMessage(command=command, params=list(params)))
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async def _connect(self) -> None:
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"""Establish connection via SOCKS5 proxy and register."""
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"""Establish connection via SOCKS5 proxy and register with random nick."""
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from bouncer.proxy import connect
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self.state = State.CONNECTING
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self._connect_nick = _random_nick()
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self.visible_host = None
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try:
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log.info(
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"[%s] connecting to %s:%d (tls=%s)",
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@@ -76,31 +138,31 @@ class Network:
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self.proxy_cfg,
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tls=self.cfg.tls,
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)
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self.connected = True
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self.state = State.REGISTERING
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self._reconnect_attempt = 0
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log.info("[%s] connected", self.cfg.name)
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log.info("[%s] connected, registering as %s", self.cfg.name, self._connect_nick)
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# IRC registration
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# IRC registration with generic identity
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if self.cfg.password:
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await self.send_raw("PASS", self.cfg.password)
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await self.send_raw("NICK", self.cfg.nick)
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await self.send_raw(
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"USER", self.cfg.user, "0", "*", self.cfg.realname,
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)
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await self.send_raw("NICK", self._connect_nick)
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await self.send_raw("USER", _random_user(), "0", "*", _random_realname())
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# Start reading
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self._read_task = asyncio.create_task(self._read_loop())
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except Exception:
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log.exception("[%s] connection failed", self.cfg.name)
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self.connected = False
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self.state = State.DISCONNECTED
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if self._running:
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await self._schedule_reconnect()
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async def _disconnect(self) -> None:
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"""Close the connection."""
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self.connected = False
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self.registered = False
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self.state = State.DISCONNECTED
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if self._probation_task and not self._probation_task.done():
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self._probation_task.cancel()
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self._probation_task = None
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if self._writer and not self._writer.is_closing():
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try:
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self._writer.close()
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@@ -127,7 +189,7 @@ class Network:
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assert self._reader is not None
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buf = b""
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try:
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while self._running and self.connected:
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while self._running and self.state != State.DISCONNECTED:
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data = await self._reader.read(4096)
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if not data:
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log.warning("[%s] server closed connection", self.cfg.name)
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@@ -153,20 +215,92 @@ class Network:
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if self._running:
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await self._schedule_reconnect()
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async def _enter_probation(self) -> None:
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"""Start probation period after registration. Survive = ready."""
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self.state = State.PROBATION
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log.info(
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"[%s] probation started (%ds), watching for k-line...",
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self.cfg.name, PROBATION_SECONDS,
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)
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self._probation_task = asyncio.create_task(self._probation_timer())
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async def _probation_timer(self) -> None:
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"""Wait out the probation period, then transition to ready."""
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try:
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await asyncio.sleep(PROBATION_SECONDS)
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except asyncio.CancelledError:
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return
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if self.state != State.PROBATION:
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return
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log.info("[%s] probation passed, connection stable", self.cfg.name)
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await self._go_ready()
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async def _go_ready(self) -> None:
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"""Transition to ready: switch to desired nick, then join channels."""
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self.state = State.READY
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# Switch from random nick to desired nick
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if self._connect_nick != self.cfg.nick:
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log.info("[%s] switching nick: %s -> %s", self.cfg.name, self.nick, self.cfg.nick)
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await self.send_raw("NICK", self.cfg.nick)
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# nick will be updated when we get the NICK confirmation from server
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# Join configured channels
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if self.cfg.autojoin and self.cfg.channels:
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for ch in self.cfg.channels:
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await self.send_raw("JOIN", ch)
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async def _handle(self, msg: IRCMessage) -> None:
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"""Handle an IRC message from the server."""
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if msg.command == "PING":
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await self.send_raw("PONG", *msg.params)
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return
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if msg.command == "ERROR":
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reason = msg.params[0] if msg.params else "unknown"
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log.warning("[%s] server ERROR: %s", self.cfg.name, reason)
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# Connection will be closed by server; read_loop handles reconnect
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return
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if msg.command == "001":
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# RPL_WELCOME - registration complete
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self.registered = True
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self.nick = msg.params[0] if msg.params else self.cfg.nick
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self.nick = msg.params[0] if msg.params else self._connect_nick
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log.info("[%s] registered as %s", self.cfg.name, self.nick)
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if self.cfg.autojoin and self.cfg.channels:
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for ch in self.cfg.channels:
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await self.send_raw("JOIN", ch)
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# Extract hostname from welcome text: "Welcome ... nick!user@host"
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if msg.params and len(msg.params) >= 2:
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welcome = msg.params[-1]
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if "!" in welcome and "@" in welcome:
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hostmask = welcome.rsplit(" ", 1)[-1]
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if "@" in hostmask:
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self.visible_host = hostmask.split("@", 1)[1]
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log.info("[%s] visible host: %s", self.cfg.name, self.visible_host)
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await self._enter_probation()
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elif msg.command == "396":
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# RPL_VISIBLEHOST - displayed host changed
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if len(msg.params) >= 2:
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self.visible_host = msg.params[1]
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log.info("[%s] visible host (396): %s", self.cfg.name, self.visible_host)
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elif msg.command == "NOTICE" and msg.params:
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# Extract hostname from server notices during connect
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text = msg.params[-1] if msg.params else ""
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if "Found your hostname" in text:
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# "*** Found your hostname: some.host.example.com"
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parts = text.rsplit(": ", 1)
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if len(parts) == 2:
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self.visible_host = parts[1].strip()
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log.info("[%s] visible host (notice): %s", self.cfg.name, self.visible_host)
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elif msg.command == "NICK" and msg.prefix:
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# Nick change confirmation
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old_nick = msg.prefix.split("!")[0]
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new_nick = msg.params[0] if msg.params else old_nick
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if old_nick == self.nick:
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log.info("[%s] nick changed: %s -> %s", self.cfg.name, old_nick, new_nick)
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self.nick = new_nick
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elif msg.command == "JOIN" and msg.prefix:
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nick = msg.prefix.split("!")[0]
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@@ -201,10 +335,18 @@ class Network:
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pass
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elif msg.command == "433":
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# ERR_NICKNAMEINUSE - append underscore
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self.nick = self.nick + "_"
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await self.send_raw("NICK", self.nick)
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log.warning("[%s] nick in use, trying %s", self.cfg.name, self.nick)
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# ERR_NICKNAMEINUSE
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if self.state == State.READY:
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# Already ready, desired nick taken -- append underscore
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self.nick = self.nick + "_"
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await self.send_raw("NICK", self.nick)
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log.warning("[%s] nick in use, trying %s", self.cfg.name, self.nick)
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else:
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# Still in registration/probation, try another random nick
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self._connect_nick = _random_nick()
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self.nick = self._connect_nick
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await self.send_raw("NICK", self._connect_nick)
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log.warning("[%s] nick in use, trying %s", self.cfg.name, self._connect_nick)
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elif msg.command == "KICK" and msg.params:
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channel = msg.params[0]
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@@ -214,7 +356,7 @@ class Network:
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log.warning("[%s] kicked from %s", self.cfg.name, channel)
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# Rejoin after a brief delay
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await asyncio.sleep(3)
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if channel in {c for c in self.cfg.channels} and self._running:
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if channel in set(self.cfg.channels) and self._running and self.ready:
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await self.send_raw("JOIN", channel)
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# Forward to router
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