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410 lines
19 KiB
Python
410 lines
19 KiB
Python
# antispam.py: Basic services-side spamfilters for IRC
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from pylinkirc import conf, utils
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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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_UNICODE_CHARMAP = {
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'A': 'AΑАᎪᗅᴀ𝐀𝐴𝑨𝒜𝓐𝔄𝔸𝕬𝖠𝗔𝘈𝘼𝙰𝚨𝛢𝜜𝝖𝞐',
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'B': 'BʙΒВвᏴᗷᛒℬ𐌁𝐁𝐵𝑩𝓑𝔅𝔹𝕭𝖡𝗕𝘉𝘽𝙱𝚩𝛣𝜝𝝗𝞑',
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'C': 'CϹСᏟℂℭⅭⲤ𐌂𝐂𝐶𝑪𝒞𝓒𝕮𝖢𝗖𝘊𝘾𝙲',
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'D': 'DᎠᗞᗪᴅⅅⅮ𝐃𝐷𝑫𝒟𝓓𝔇𝔻𝕯𝖣𝗗𝘋𝘿𝙳',
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'E': 'EΕЕᎬᴇℰ⋿ⴹ𝐄𝐸𝑬𝓔𝔈𝔼𝕰𝖤𝗘𝘌𝙀𝙴𝚬𝛦𝜠𝝚𝞔',
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'F': 'FϜᖴℱ𝐅𝐹𝑭𝓕𝔉𝔽𝕱𝖥𝗙𝘍𝙁𝙵𝟊',
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'G': 'GɢԌԍᏀᏳ𝐆𝐺𝑮𝒢𝓖𝔊𝔾𝕲𝖦𝗚𝘎𝙂𝙶',
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'H': 'HʜΗНнᎻᕼℋℌℍⲎ𝐇𝐻𝑯𝓗𝕳𝖧𝗛𝘏𝙃𝙷𝚮𝛨𝜢𝝜𝞖',
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'J': 'JЈᎫᒍᴊ𝐉𝐽𝑱𝒥𝓙𝔍𝕁𝕵𝖩𝗝𝘑𝙅𝙹',
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'K': 'KΚКᏦᛕKⲔ𝐊𝐾𝑲𝒦𝓚𝔎𝕂𝕶𝖪𝗞𝘒𝙆𝙺𝚱𝛫𝜥𝝟𝞙',
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'L': 'LʟᏞᒪℒⅬ𝐋𝐿𝑳𝓛𝔏𝕃𝕷𝖫𝗟𝘓𝙇𝙻',
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'M': 'MΜϺМᎷᗰᛖℳⅯⲘ𐌑𝐌𝑀𝑴𝓜𝔐𝕄𝕸𝖬𝗠𝘔𝙈𝙼𝚳𝛭𝜧𝝡𝞛',
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'N': 'NɴΝℕⲚ𝐍𝑁𝑵𝒩𝓝𝔑𝕹𝖭𝗡𝘕𝙉𝙽𝚴𝛮𝜨𝝢𝞜',
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'P': 'PΡРᏢᑭᴘᴩℙⲢ𝐏𝑃𝑷𝒫𝓟𝔓𝕻𝖯𝗣𝘗𝙋𝙿𝚸𝛲𝜬𝝦𝞠',
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'Q': 'Qℚⵕ𝐐𝑄𝑸𝒬𝓠𝔔𝕼𝖰𝗤𝘘𝙌𝚀',
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'R': 'RƦʀᎡᏒᖇᚱℛℜℝ𝐑𝑅𝑹𝓡𝕽𝖱𝗥𝘙𝙍𝚁',
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'S': 'SЅՏᏕᏚ𝐒𝑆𝑺𝒮𝓢𝔖𝕊𝕾𝖲𝗦𝘚𝙎𝚂',
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'T': 'TΤτТтᎢᴛ⊤⟙Ⲧ𐌕𝐓𝑇𝑻𝒯𝓣𝔗𝕋𝕿𝖳𝗧𝘛𝙏𝚃𝚻𝛕𝛵𝜏𝜯𝝉𝝩𝞃𝞣𝞽',
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'U': 'UՍሀᑌ∪⋃𝐔𝑈𝑼𝒰𝓤𝔘𝕌𝖀𝖴𝗨𝘜𝙐𝚄',
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'V': 'VѴ٧۷ᏙᐯⅤⴸ𝐕𝑉𝑽𝒱𝓥𝔙𝕍𝖁𝖵𝗩𝘝𝙑𝚅',
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'W': 'WԜᎳᏔ𝐖𝑊𝑾𝒲𝓦𝔚𝕎𝖂𝖶𝗪𝘞𝙒𝚆',
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'X': 'XΧХ᙭ᚷⅩ╳Ⲭⵝ𐌗𐌢𝐗𝑋𝑿𝒳𝓧𝔛𝕏𝖃𝖷𝗫𝘟𝙓𝚇𝚾𝛸𝜲𝝬𝞦',
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'Y': 'YΥϒУҮᎩᎽⲨ𝐘𝑌𝒀𝒴𝓨𝔜𝕐𝖄𝖸𝗬𝘠𝙔𝚈𝚼𝛶𝜰𝝪𝞤',
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'Z': 'ZΖᏃℤℨ𝐙𝑍𝒁𝒵𝓩𝖅𝖹𝗭𝘡𝙕𝚉𝚭𝛧𝜡𝝛𝞕',
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'a': 'aɑαа⍺𝐚𝑎𝒂𝒶𝓪𝔞𝕒𝖆𝖺𝗮𝘢𝙖𝚊𝛂𝛼𝜶𝝰𝞪',
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'b': 'bƄЬᏏᖯ𝐛𝑏𝒃𝒷𝓫𝔟𝕓𝖇𝖻𝗯𝘣𝙗𝚋',
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'c': 'cϲсᴄⅽⲥ𝐜𝑐𝒄𝒸𝓬𝔠𝕔𝖈𝖼𝗰𝘤𝙘𝚌',
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'd': 'ⅾdԁᏧᑯⅆⅾ𝐝𝑑𝒅𝒹𝓭𝔡𝕕𝖉𝖽𝗱𝘥𝙙𝚍',
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'e': 'eеҽ℮ℯⅇ𝐞𝑒𝒆𝓮𝔢𝕖𝖊𝖾𝗲𝘦𝙚𝚎ᥱ',
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'f': 'fſϝքẝ𝐟𝑓𝒇𝒻𝓯𝔣𝕗𝖋𝖿𝗳𝘧𝙛𝚏𝟋',
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'g': 'gƍɡցᶃℊ𝐠𝑔𝒈𝓰𝔤𝕘𝖌𝗀𝗴𝘨𝙜𝚐',
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'h': 'hһհᏂℎ𝐡𝒉𝒽𝓱𝔥𝕙𝖍𝗁𝗵𝘩𝙝𝚑',
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'i': 'iıɩɪιіӏᎥℹⅈⅰ⍳ꙇ𝐢𝑖𝒊𝒾𝓲𝔦𝕚𝖎𝗂𝗶𝘪𝙞𝚒𝚤𝛊𝜄𝜾𝝸𝞲',
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'j': 'jϳјⅉ𝐣𝑗𝒋𝒿𝓳𝔧𝕛𝖏𝗃𝗷𝘫𝙟𝚓',
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'k': 'k𝐤𝑘𝒌𝓀𝓴𝔨𝕜𝖐𝗄𝗸𝘬𝙠𝚔',
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'l': 'ⅼ',
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'm': 'ⅿm',
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'n': 'nոռ𝐧𝑛𝒏𝓃𝓷𝔫𝕟𝖓𝗇𝗻𝘯𝙣𝚗ᥒ',
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'o': 'ⲟഠοо',
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'p': 'pρϱр⍴ⲣ𝐩𝑝𝒑𝓅𝓹𝔭𝕡𝖕𝗉𝗽𝘱𝙥𝚙𝛒𝛠𝜌𝜚𝝆𝝔𝞀𝞎𝞺𝟈',
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'q': 'qԛգզ𝐪𝑞𝒒𝓆𝓺𝔮𝕢𝖖𝗊𝗾𝘲𝙦𝚚',
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'r': 'rгᴦⲅ𝐫𝑟𝒓𝓇𝓻𝔯𝕣𝖗𝗋𝗿𝘳𝙧𝚛',
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's': 'sƽѕꜱ𝐬𝑠𝒔𝓈𝓼𝔰𝕤𝖘𝗌𝘀𝘴𝙨𝚜',
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't': 't𝐭𝑡𝒕𝓉𝓽𝔱𝕥𝖙𝗍𝘁𝘵𝙩𝚝',
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'u': 'uʋυսᴜ𝐮𝑢𝒖𝓊𝓾𝔲𝕦𝖚𝗎𝘂𝘶𝙪𝚞𝛖𝜐𝝊𝞄𝞾ᥙ',
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'v': 'vνѵטᴠⅴ∨⋁𝐯𝑣𝒗𝓋𝓿𝔳𝕧𝖛𝗏𝘃𝘷𝙫𝚟𝛎𝜈𝝂𝝼𝞶',
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'w': 'wɯѡԝաᴡ𝐰𝑤𝒘𝓌𝔀𝔴𝕨𝖜𝗐𝘄𝘸𝙬𝚠',
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'x': 'x×хᕁᕽ᙮ⅹ⤫⤬⨯𝐱𝑥𝒙𝓍𝔁𝔵𝕩𝖝𝗑𝘅𝘹𝙭𝚡',
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'y': 'yɣʏγуүყᶌỿℽ𝐲𝑦𝒚𝓎𝔂𝔶𝕪𝖞𝗒𝘆𝘺𝙮𝚢𝛄𝛾𝜸𝝲𝞬',
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'z': 'zᴢ𝐳𝑧𝒛𝓏𝔃𝔷𝕫𝖟𝗓𝘇𝘻𝙯𝚣',
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'/': '᜵⁄∕⧸／',
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'\\': '⧵﹨⧹＼',
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' ': '\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\xa0\u202f\u205f',
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'.': '․．',
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'-': '˗╴﹣－−⎼',
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'!': '﹗！ǃⵑ︕',
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':': ':˸։፡᛬⁚∶⠆︓﹕',
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'#': '＃﹟'
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}
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def _prep_maketrans(data):
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from_s = ''
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to_s = ''
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for target, chars in data.items():
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from_s += chars
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to_s += target * len(chars)
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return str.maketrans(from_s, to_s)
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UNICODE_CHARMAP = _prep_maketrans(_UNICODE_CHARMAP)
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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):
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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:
|
||
nicks_caught.add(word)
|
||
if len(nicks_caught) >= min_nicks:
|
||
# Get the punishment and reason.
|
||
punishment = mhl_settings.get('punishment', MASSHIGHLIGHT_DEFAULTS['punishment']).lower()
|
||
reason = mhl_settings.get('reason', MASSHIGHLIGHT_DEFAULTS['reason'])
|
||
|
||
log.info("(%s) antispam: punishing %s => %s for mass highlight spam",
|
||
irc.name,
|
||
irc.get_friendly_name(source),
|
||
channel)
|
||
punished = _punish(irc, source, channel, punishment, reason)
|
||
break
|
||
|
||
log.debug('(%s) antispam.masshighlight: got %s/%s nicks on message to %r', irc.name,
|
||
len(nicks_caught), min_nicks, channel)
|
||
return not punished # Filter this message from relay, etc. if it triggered protection
|
||
|
||
utils.add_hook(handle_masshighlight, 'PRIVMSG', priority=1000)
|
||
utils.add_hook(handle_masshighlight, 'NOTICE', priority=1000)
|
||
|
||
TEXTFILTER_DEFAULTS = {
|
||
'reason': "Spam is prohibited",
|
||
'punishment': 'kick+ban+block',
|
||
'watch_pms': False,
|
||
'enabled': False,
|
||
'munge_unicode': True,
|
||
}
|
||
def handle_textfilter(irc, source, command, args):
|
||
"""Antispam text filter handler."""
|
||
target = args['target']
|
||
text = args['text']
|
||
txf_settings = irc.get_service_option('antispam', 'textfilter',
|
||
TEXTFILTER_DEFAULTS)
|
||
|
||
if not txf_settings.get('enabled', False):
|
||
return
|
||
|
||
my_uid = sbot.uids.get(irc.name)
|
||
|
||
# XXX workaround for single-bot protocols like Clientbot
|
||
if irc.pseudoclient and not irc.has_cap('can-spawn-clients'):
|
||
my_uid = irc.pseudoclient.uid
|
||
|
||
if (not irc.connected.is_set()) or (not my_uid):
|
||
# Break if the network isn't ready.
|
||
log.debug("(%s) antispam.textfilters: skipping processing; network isn't ready", irc.name)
|
||
return
|
||
elif irc.is_internal_client(source):
|
||
# Ignore messages from our own clients.
|
||
log.debug("(%s) antispam.textfilters: skipping processing message from internal client %s", irc.name, source)
|
||
return
|
||
elif source not in irc.users:
|
||
log.debug("(%s) antispam.textfilters: ignoring message from non-user %s", irc.name, source)
|
||
return
|
||
|
||
if irc.is_channel(target):
|
||
channel_or_none = target
|
||
if target not in irc.channels or my_uid not in irc.channels[target].users:
|
||
# We're not monitoring this channel.
|
||
log.debug("(%s) antispam.textfilters: skipping processing message from channel %r we're not in", irc.name, target)
|
||
return
|
||
else:
|
||
channel_or_none = None
|
||
watch_pms = txf_settings.get('watch_pms', TEXTFILTER_DEFAULTS['watch_pms'])
|
||
|
||
if watch_pms == 'services':
|
||
if not irc.get_service_bot(target):
|
||
log.debug("(%s) antispam.textfilters: skipping processing; %r is not a service bot (watch_pms='services')", irc.name, target)
|
||
return
|
||
elif watch_pms == 'all':
|
||
log.debug("(%s) antispam.textfilters: checking all PMs (watch_pms='all')", irc.name)
|
||
pass
|
||
else:
|
||
# Not a channel.
|
||
log.debug("(%s) antispam.textfilters: skipping processing; %r is not a channel and watch_pms is disabled", irc.name, target)
|
||
return
|
||
|
||
# Merge together global and local textfilter lists.
|
||
txf_globs = set(conf.conf.get('antispam', {}).get('textfilter_globs', [])) | \
|
||
set(irc.serverdata.get('antispam_textfilter_globs', []))
|
||
|
||
punishment = txf_settings.get('punishment', TEXTFILTER_DEFAULTS['punishment']).lower()
|
||
reason = txf_settings.get('reason', TEXTFILTER_DEFAULTS['reason'])
|
||
|
||
if irc.get_service_option('antispam', 'strip_formatting', True):
|
||
text = utils.strip_irc_formatting(text)
|
||
if txf_settings.get('munge_unicode', TEXTFILTER_DEFAULTS['munge_unicode']):
|
||
text = str.translate(text, UNICODE_CHARMAP)
|
||
|
||
punished = False
|
||
for filterglob in txf_globs:
|
||
if utils.match_text(filterglob, text):
|
||
log.info("(%s) antispam: punishing %s => %s for text filter %r",
|
||
irc.name,
|
||
irc.get_friendly_name(source),
|
||
irc.get_friendly_name(target),
|
||
filterglob)
|
||
punished = _punish(irc, source, channel_or_none, punishment, reason)
|
||
break
|
||
|
||
return not punished # Filter this message from relay, etc. if it triggered protection
|
||
|
||
utils.add_hook(handle_textfilter, 'PRIVMSG', priority=999)
|
||
utils.add_hook(handle_textfilter, 'NOTICE', priority=999)
|
||
|
||
PARTQUIT_DEFAULTS = {
|
||
'watch_quits': True,
|
||
'watch_parts': True,
|
||
'part_filter_message': "Reason filtered",
|
||
'quit_filter_message': "Reason filtered",
|
||
}
|
||
def handle_partquit(irc, source, command, args):
|
||
"""Antispam part/quit message filter."""
|
||
text = args.get('text')
|
||
pq_settings = irc.get_service_option('antispam', 'partquit',
|
||
PARTQUIT_DEFAULTS)
|
||
|
||
if not text:
|
||
return # No text to match against
|
||
elif command == 'QUIT' and not pq_settings.get('watch_quits', True):
|
||
return # Not enabled
|
||
elif command == 'PART' and not pq_settings.get('watch_parts', True):
|
||
return
|
||
|
||
# Merge together global and local partquit filter lists.
|
||
pq_globs = set(conf.conf.get('antispam', {}).get('partquit_globs', [])) | \
|
||
set(irc.serverdata.get('antispam_partquit_globs', []))
|
||
if not pq_globs:
|
||
return
|
||
|
||
for filterglob in pq_globs:
|
||
if utils.match_text(filterglob, text):
|
||
# For parts, also log the affected channels
|
||
if command == 'PART':
|
||
filtered_message = pq_settings.get('part_filter_message', PARTQUIT_DEFAULTS['part_filter_message'])
|
||
log.info('(%s) antispam: filtered part message from %s on %s due to part/quit filter glob %s',
|
||
irc.name, irc.get_hostmask(source), ','.join(args['channels']), filterglob)
|
||
else:
|
||
filtered_message = pq_settings.get('quit_filter_message', PARTQUIT_DEFAULTS['quit_filter_message'])
|
||
log.info('(%s) antispam: filtered quit message from %s due to part/quit filter glob %s',
|
||
irc.name, args['userdata'].nick, filterglob)
|
||
args['text'] = filtered_message
|
||
break
|
||
utils.add_hook(handle_partquit, 'PART', priority=999)
|
||
utils.add_hook(handle_partquit, 'QUIT', priority=999)
|