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296 lines
13 KiB
Python
296 lines
13 KiB
Python
# antispam.py: Basic services-side spamfilters for IRC
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import ircmatch
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from pylinkirc import utils, world, conf
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from pylinkirc.log import log
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mydesc = ("Provides anti-spam functionality.")
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sbot = utils.register_service("antispam", default_nick="AntiSpam", desc=mydesc)
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def die(irc=None):
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utils.unregister_service("antispam")
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PUNISH_OPTIONS = ['kill', 'ban', 'quiet', 'kick', 'block']
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EXEMPT_OPTIONS = ['voice', 'halfop', 'op']
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DEFAULT_EXEMPT_OPTION = 'halfop'
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def _punish(irc, target, channel, punishment, reason):
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"""Punishes the target user. This function returns True if the user was successfully punished."""
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if target not in irc.users:
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log.warning("(%s) antispam: got target %r that isn't a user?", irc.name, target)
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return False
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elif irc.is_oper(target, allowAuthed=False):
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log.debug("(%s) antispam: refusing to punish oper %s/%s", irc.name, target, irc.get_friendly_name(target))
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return False
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target_nick = irc.get_friendly_name(target)
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if channel:
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c = irc.channels[channel]
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exempt_level = irc.get_service_option('antispam', 'exempt_level', DEFAULT_EXEMPT_OPTION).lower()
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if exempt_level not in EXEMPT_OPTIONS:
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log.error('(%s) Antispam exempt %r is not a valid setting, '
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'falling back to defaults; accepted settings include: %s',
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irc.name, exempt_level, ', '.join(EXEMPT_OPTIONS))
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exempt_level = DEFAULT_EXEMPT_OPTION
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if exempt_level == 'voice' and c.is_voice_plus(target):
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log.debug("(%s) antispam: refusing to punish voiced and above %s/%s", irc.name, target, target_nick)
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return False
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elif exempt_level == 'halfop' and c.is_halfop_plus(target):
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log.debug("(%s) antispam: refusing to punish halfop and above %s/%s", irc.name, target, target_nick)
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return False
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elif exempt_level == 'op' and c.is_op_plus(target):
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log.debug("(%s) antispam: refusing to punish op and above %s/%s", irc.name, target, target_nick)
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return False
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my_uid = sbot.uids.get(irc.name)
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# XXX workaround for single-bot protocols like Clientbot
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if irc.pseudoclient and not irc.has_cap('can-spawn-clients'):
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my_uid = irc.pseudoclient.uid
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bans = set()
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log.debug('(%s) antispam: got %r as punishment for %s/%s', irc.name, punishment,
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target, irc.get_friendly_name(target))
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def _ban():
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bans.add(irc.make_channel_ban(target))
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def _quiet():
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bans.add(irc.make_channel_ban(target, ban_type='quiet'))
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def _kick():
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irc.kick(my_uid, channel, target, reason)
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irc.call_hooks([my_uid, 'ANTISPAM_KICK', {'channel': channel, 'text': reason, 'target': target,
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'parse_as': 'KICK'}])
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def _kill():
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if target not in irc.users:
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log.debug('(%s) antispam: not killing %s/%s; they already left', irc.name, target,
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irc.get_friendly_name(target))
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return
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userdata = irc.users[target]
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irc.kill(my_uid, target, reason)
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irc.call_hooks([my_uid, 'ANTISPAM_KILL', {'target': target, 'text': reason,
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'userdata': userdata, 'parse_as': 'KILL'}])
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kill = False
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successful_punishments = 0
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for action in set(punishment.split('+')):
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if action not in PUNISH_OPTIONS:
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log.error('(%s) Antispam punishment %r is not a valid setting; '
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'accepted settings include: %s OR any combination of '
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'these joined together with a "+".',
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irc.name, punishment, ', '.join(PUNISH_OPTIONS))
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return
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elif action == 'block':
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# We only need to increment this for this function to return True
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successful_punishments += 1
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elif action == 'kill':
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kill = True # Delay kills so that the user data doesn't disappear.
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# XXX factorize these blocks
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elif action == 'kick' and channel:
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try:
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_kick()
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except NotImplementedError:
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log.warning("(%s) antispam: Kicks are not supported on this network, skipping; "
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"target was %s/%s", irc.name, target_nick, channel)
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else:
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successful_punishments += 1
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elif action == 'ban' and channel:
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try:
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_ban()
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except (ValueError, NotImplementedError):
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log.warning("(%s) antispam: Bans are not supported on this network, skipping; "
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"target was %s/%s", irc.name, target_nick, channel)
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else:
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successful_punishments += 1
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elif action == 'quiet' and channel:
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try:
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_quiet()
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except (ValueError, NotImplementedError):
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log.warning("(%s) antispam: Quiet is not supported on this network, skipping; "
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"target was %s/%s", irc.name, target_nick, channel)
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else:
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successful_punishments += 1
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if bans: # Set all bans at once to prevent spam
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irc.mode(my_uid, channel, bans)
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irc.call_hooks([my_uid, 'ANTISPAM_BAN',
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{'target': channel, 'modes': bans, 'parse_as': 'MODE'}])
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if kill:
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try:
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_kill()
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except NotImplementedError:
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log.warning("(%s) antispam: Kills are not supported on this network, skipping; "
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"target was %s/%s", irc.name, target_nick, channel)
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else:
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successful_punishments += 1
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if not successful_punishments:
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log.warning('(%s) antispam: Failed to punish %s with %r, target was %s', irc.name,
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target_nick, punishment, channel or 'a PM')
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return bool(successful_punishments)
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MASSHIGHLIGHT_DEFAULTS = {
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'min_length': 50,
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'min_nicks': 5,
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'reason': "Mass highlight spam is prohibited",
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'punishment': 'kick+ban',
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'enabled': False
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}
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def handle_masshighlight(irc, source, command, args):
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"""Handles mass highlight attacks."""
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channel = args['target']
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text = args['text']
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mhl_settings = irc.get_service_option('antispam', 'masshighlight',
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MASSHIGHLIGHT_DEFAULTS)
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if not mhl_settings.get('enabled', False):
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return
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my_uid = sbot.uids.get(irc.name)
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# XXX workaround for single-bot protocols like Clientbot
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if irc.pseudoclient and not irc.has_cap('can-spawn-clients'):
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my_uid = irc.pseudoclient.uid
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if (not irc.connected.is_set()) or (not my_uid):
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# Break if the network isn't ready.
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log.debug("(%s) antispam.masshighlight: skipping processing; network isn't ready", irc.name)
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return
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elif not irc.is_channel(channel):
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# Not a channel - mass highlight blocking only makes sense within channels
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log.debug("(%s) antispam.masshighlight: skipping processing; %r is not a channel", irc.name, channel)
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return
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elif irc.is_internal_client(source):
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# Ignore messages from our own clients.
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log.debug("(%s) antispam.masshighlight: skipping processing message from internal client %s", irc.name, source)
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return
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elif source not in irc.users:
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log.debug("(%s) antispam.masshighlight: ignoring message from non-user %s", irc.name, source)
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return
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elif channel not in irc.channels or my_uid not in irc.channels[channel].users:
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# We're not monitoring this channel.
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log.debug("(%s) antispam.masshighlight: skipping processing message from channel %r we're not in", irc.name, channel)
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return
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elif len(text) < mhl_settings.get('min_length', MASSHIGHLIGHT_DEFAULTS['min_length']):
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log.debug("(%s) antispam.masshighlight: skipping processing message %r; it's too short", irc.name, text)
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return
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if irc.get_service_option('antispam', 'strip_formatting', True):
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text = utils.strip_irc_formatting(text)
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# Strip :, from potential nicks
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words = [word.rstrip(':,') for word in text.split()]
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userlist = [irc.users[uid].nick for uid in irc.channels[channel].users.copy()]
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min_nicks = mhl_settings.get('min_nicks', MASSHIGHLIGHT_DEFAULTS['min_nicks'])
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# Don't allow repeating the same nick to trigger punishment
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nicks_caught = set()
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punished = False
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for word in words:
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if word in userlist:
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nicks_caught.add(word)
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if len(nicks_caught) >= min_nicks:
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# Get the punishment and reason.
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punishment = mhl_settings.get('punishment', MASSHIGHLIGHT_DEFAULTS['punishment']).lower()
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reason = mhl_settings.get('reason', MASSHIGHLIGHT_DEFAULTS['reason'])
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log.info("(%s) antispam: punishing %s => %s for mass highlight spam",
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irc.name,
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irc.get_friendly_name(source),
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channel)
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punished = _punish(irc, source, channel, punishment, reason)
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break
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log.debug('(%s) antispam.masshighlight: got %s/%s nicks on message to %r', irc.name,
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len(nicks_caught), min_nicks, channel)
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return not punished # Filter this message from relay, etc. if it triggered protection
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utils.add_hook(handle_masshighlight, 'PRIVMSG', priority=1000)
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utils.add_hook(handle_masshighlight, 'NOTICE', priority=1000)
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TEXTFILTER_DEFAULTS = {
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'reason': "Spam is prohibited",
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'punishment': 'kick+ban+block',
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'watch_pms': 'false',
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'enabled': False
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}
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def handle_textfilter(irc, source, command, args):
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"""Antispam text filter handler."""
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target = args['target']
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text = args['text']
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txf_settings = irc.get_service_option('antispam', 'textfilter',
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TEXTFILTER_DEFAULTS)
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if not txf_settings.get('enabled', False):
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return
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my_uid = sbot.uids.get(irc.name)
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# XXX workaround for single-bot protocols like Clientbot
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if irc.pseudoclient and not irc.has_cap('can-spawn-clients'):
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my_uid = irc.pseudoclient.uid
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if (not irc.connected.is_set()) or (not my_uid):
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# Break if the network isn't ready.
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log.debug("(%s) antispam.textfilters: skipping processing; network isn't ready", irc.name)
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return
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elif irc.is_internal_client(source):
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# Ignore messages from our own clients.
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log.debug("(%s) antispam.textfilters: skipping processing message from internal client %s", irc.name, source)
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return
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elif source not in irc.users:
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log.debug("(%s) antispam.textfilters: ignoring message from non-user %s", irc.name, source)
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return
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if irc.is_channel(target):
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channel_or_none = target
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if target not in irc.channels or my_uid not in irc.channels[target].users:
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# We're not monitoring this channel.
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log.debug("(%s) antispam.textfilters: skipping processing message from channel %r we're not in", irc.name, target)
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return
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else:
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channel_or_none = None
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watch_pms = txf_settings.get('watch_pms', TEXTFILTER_DEFAULTS['watch_pms'])
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if watch_pms == 'services':
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if not irc.get_service_bot(target):
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log.debug("(%s) antispam.textfilters: skipping processing; %r is not a service bot (watch_pms='services')", irc.name, target)
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return
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elif watch_pms == 'all':
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log.debug("(%s) antispam.textfilters: checking all PMs (watch_pms='all')", irc.name)
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pass
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else:
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# Not a channel.
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log.debug("(%s) antispam.textfilters: skipping processing; %r is not a channel and watch_pms is disabled", irc.name, target)
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return
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# Merge together global and local textfilter lists.
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txf_globs = set(conf.conf.get('antispam', {}).get('textfilter_globs', [])) | \
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set(irc.serverdata.get('antispam_textfilter_globs', []))
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punishment = txf_settings.get('punishment', TEXTFILTER_DEFAULTS['punishment']).lower()
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reason = txf_settings.get('reason', TEXTFILTER_DEFAULTS['reason'])
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if irc.get_service_option('antispam', 'strip_formatting', True):
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text = utils.strip_irc_formatting(text)
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punished = False
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for filterglob in txf_globs:
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if ircmatch.match(1, filterglob, text):
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log.info("(%s) antispam: punishing %s => %s for text filter %r",
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irc.name,
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irc.get_friendly_name(source),
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irc.get_friendly_name(target),
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filterglob)
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punished = _punish(irc, source, channel_or_none, punishment, reason)
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break
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return not punished # Filter this message from relay, etc. if it triggered protection
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utils.add_hook(handle_textfilter, 'PRIVMSG', priority=999)
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utils.add_hook(handle_textfilter, 'NOTICE', priority=999)
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