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relay: base mode relaying off a whitelist (closes #54)

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Modes that aren't standard/safe (e.g. ojoin +Y, permchan +P, various anti-flood modes) are simply ignored.
This commit is contained in:
James Lu 2015-07-19 15:56:29 -07:00
parent 0cb9065d53
commit 4078cef3e4
1 changed files with 19 additions and 2 deletions
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21
plugins/relay.py
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@ -383,6 +383,13 @@ def handle_chgclient(irc, source, command, args):
for c in ('CHGHOST', 'CHGNAME', 'CHGIDENT'):
utils.add_hook(handle_chgclient, c)
whitelisted_cmodes = {'admin', 'allowinvite', 'autoop', 'ban', 'banexception',
'blockcolor', 'halfop', 'invex', 'inviteonly', 'key',
'limit', 'moderated', 'noctcp', 'noextmsg', 'nokick',
'noknock', 'nonick', 'nonotice', 'op', 'operonly',
'opmoderated', 'owner', 'private', 'regonly',
'regmoderated', 'secret', 'sslonly',
'stripcolor', 'topiclock', 'voice'}
def relayModes(irc, remoteirc, sender, channel, modes=None):
remotechan = findRemoteChan(irc, remoteirc, channel)
log.debug('(%s) Relay mode: remotechan for %s on %s is %s', irc.name, channel, irc.name, remotechan)
@ -405,6 +412,11 @@ def relayModes(irc, remoteirc, sender, channel, modes=None):
for name, m in irc.cmodes.items():
supported_char = None
if modechar == m:
if name not in whitelisted_cmodes:
log.debug("(%s) Relay mode: skipping mode (%r, %r) because "
"it isn't a whitelisted (safe) mode for relay.",
irc.name, modechar, arg)
break
if modechar in irc.prefixmodes:
# This is a prefix mode (e.g. +o). We must coerse the argument
# so that the target exists on the remote relay network.
@ -419,9 +431,14 @@ def relayModes(irc, remoteirc, sender, channel, modes=None):
if name in ('ban', 'banexception', 'invex') and not utils.isHostmask(arg):
# Don't add bans that don't match n!u@h syntax!
log.debug("(%s) Relay mode: skipping mode (%r, %r) because it doesn't match nick!user@host syntax.",
irc.name, supported_char, arg)
continue
irc.name, modechar, arg)
break
supported_modes.append((prefix+supported_char, arg))
break
else:
log.debug("(%s) Relay mode: skipping mode (%r, %r) because "
"the remote network (%s)'s IRCd (%s) doesn't support it.",
irc.name, modechar, arg, remoteirc.name, irc.proto.__name__)
log.debug('(%s) Relay mode: final modelist (sending to %s%s) is %s', irc.name, remoteirc.name, remotechan, supported_modes)
# Don't send anything if there are no supported modes left after filtering.
if supported_modes: