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relay: block /OJOIN in claim

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This commit is contained in:
James Lu 2016-08-27 19:09:02 -07:00
parent ae94bec6b8
commit 1c4cb94a13
1 changed files with 35 additions and 0 deletions
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35
plugins/relay.py
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@ -873,6 +873,41 @@ def handle_join(irc, numeric, command, args):
return
ts = args['ts']
users = set(args['users'])
claim_passed = checkClaim(irc, channel, numeric)
current_chandata = irc.channels[channel]
chandata = args.get('chandata')
log.debug('(%s) relay.handle_join: claim for %s on %s: %s', irc.name, numeric, channel, claim_passed)
log.debug('(%s) relay.handle_join: old channel data %s', irc.name, chandata)
log.debug('(%s) relay.handle_join: current channel data %s', irc.name, current_chandata)
if chandata and not claim_passed:
# If the server we're receiving an SJOIN from isn't in the claim list, undo ALL attempts
# from it to burst modes.
# This option can prevent things like /OJOIN abuse or split riding with oper override, but
# has the side effect of causing all prefix modes on leaf links to be lost when networks
# split and rejoin.
modes = []
for user in users:
# XXX: Find the diff of the new and old mode lists of the channel. Not pretty, but I'd
# rather not change the 'users' format of SJOIN just for this. -GL
try:
oldmodes = set(chandata.getPrefixModes(user))
except KeyError:
# User was never in channel. Treat their mode list as empty.
oldmodes = set()
newmodes = set(current_chandata.getPrefixModes(user))
modediff = newmodes - oldmodes
log.debug('(%s) relay.handle_join: mode diff for %s on %s: %s oldmodes=%s newmodes=%s',
irc.name, user, channel, modediff, oldmodes, newmodes)
for modename in modediff:
modechar = irc.cmodes.get(modename)
if modechar:
modes.append(('-%s' % modechar, user))
if modes:
log.debug('(%s) relay.handle_join: reverting modes on BURST: %s', irc.name, irc.joinModes(modes))
irc.proto.mode(irc.sid, channel, modes)
relayJoins(irc, channel, users, ts, burst=False)
utils.add_hook(handle_join, 'JOIN')