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  14    <H1>[IRCServices] Bug: Kick/ban loops</H1>
  15     <B>Andy Li</B>
  16     <A HREF="mailto:ircservices%40ircservices.za.net?Subject=%5BIRCServices%5D%20Bug%3A%20Kick/ban%20loops&In-Reply-To="
  17        TITLE="[IRCServices] Bug: Kick/ban loops">andycandy212 at gmail.com
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  19     <I>Sat Aug 11 19:41:35 PDT 2007</I>
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  34 <PRE>I was playing around with an irc server and I found 2 ways to place a
  35 user in a kickban loop:
  36 1) placing +e ban exceptions using the extban type ~c:#channel, where
  37 it is supported, on ircds such as Unreal.
  38 example:
  39 * Me sets mode: +e ~c:#otherchan
  40 * ChanServ sets mode: +b *!*@localhost
  41 * Test was kicked by ChanServ (AKICK by Me (User has been banned from
  42 the channel))
  43 * Test (<A HREF="http://lists.ircservices.za.net/mailman/listinfo/ircservices">adfy at hmm-FC8857E1</A>) has joined #chan
  44 * Test was kicked by ChanServ (AKICK by Me (User has been banned from
  45 the channel))
  46 * Test (<A HREF="http://lists.ircservices.za.net/mailman/listinfo/ircservices">adfy at hmm-FC8857E1</A>) has joined #chan
  47 * Test was kicked by ChanServ (AKICK by Me (User has been banned from
  48 the channel))
  49 etc.
  50
  51 My suggestion: match ~c: extbans against all channels that a user is
  52 on before they are kicked
  53
  54 2) Joining a forbidden/suspended channel and then setting an +e
  55 exception quickly by either sending the 2 commands into the same
  56 packet so that they are processed before services can kick them, or
  57 sending the 2 cmds quickly enough so that the lag between services/the
  58 network makes services unable to kick the user before he does it,
  59 either with an mirc script or some other script. This could be done
  60 by:
  61 a program, eg send_cmd (&quot;JOIN #somechan\nMODE #somechan +e *!*@*&quot;);
  62 or typing //raw join #chan $crlf mode #chan +e *!*@* in mirc.
  63 eg:
  64
  65 -&gt; Server: join #test \n mode #test +e *!*@*
  66 * Now talking in #test
  67 * Test sets mode: +e *!*@*
  68 * ChanServ (<A HREF="http://lists.ircservices.za.net/mailman/listinfo/ircservices">services at services.hi2u.net</A>) has joined #test
  69 * ChanServ sets mode: +b *!*@*
  70 * You were kicked by ChanServ (This channel may not be used.)
  71 * Attempting to rejoin channel #test
  72 * You were kicked by ChanServ (This channel may not be used.)
  73 * Attempting to rejoin channel #test
  74 etc.
  75 This could be solved by checking for matching excepts before kicking a
  76 user from a forbidden chan, or enabling ChanServ to stay permenantly
  77 inside a forbidden/susp'd chan until it is usable again with
  78 CSInhabit.
  79
  80 These two methods can be easily used to harass or flood other users
  81 off of irc, and, if done on a large enough scale, crash services
  82 and/or the network.
  83 A warning should also be placed in the manual warning people who add
  84 extbans to their ircd to also enable proper checking in the services.
  85 </PRE>
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