Date: Sun, 22 Jul 2001 15:57:56 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Hajimu UMEMOTO <ume@mahoroba.org> Cc: aschneid@mail.slc.edu, dillon@earth.backplane.com, brian@Awfulhak.org, ras@e-gerbil.net, roam@orbitel.bg, freebsd-security@FreeBSD.ORG, freebsd-gnats-submit@FreeBSD.ORG Subject: Re: bin/22595: telnetd tricked into using arbitrary peer ip Message-ID: <200107222257.f6MMvuE12313@earth.backplane.com> References: <20010723.053051.88524825.ume@mahoroba.org> <200107222117.f6MLHwr11669@earth.backplane.com> <20010722172232.A94306@mail.slc.edu> <20010723.063458.35714423.ume@mahoroba.org>
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:>>>>> On Sun, 22 Jul 2001 17:22:32 -0400
:>>>>> Anthony Schneider <aschneid@mail.slc.edu> said:
:
:aschneid> 16 bytes.
:
:It's a binary form. We need 40 bytes for global address. To save
:site-local or link-local address, we need more space for scope
:identifier. I believe the length of scope identifier is not defined
:and system specific.
:
:global address:
:
: 1234567890123456789012345678901234567890
: NNNN:NNNN:NNNN:NNNN:NNNN:NNNN:NNNN:NNNN\n
:
:scoped address:
:
: 1234567890123456789012345678901234567890
: NNNN:NNNN:NNNN:NNNN:NNNN:NNNN:NNNN:NNNN%fxp0\n
:
:There is one more consideration. `:' is conflict with X. I have no
:particular idea to solve this problem. Enclosing IPv6 address with
:`[' and `]' doesn't help without changing X side.
:
:--
:Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
:ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org
:http://www.imasy.org/~ume/
Ok, it sounds like 56 bytes ought to be sufficient. This will
increase the lastlog structure from 28 bytes to 68 bytes
and the utmp/wtmp structure from 44 bytes to 84 bytes. A
buildworld would be necessary to deal with the change and
certrain ports, such as ftpd, would have to be rebuilt
(for those people using them) to avoid corruption. utmp
is one of the few structures in the system which is
written out 'manually' by various programs, which is why
. changing the size of the structure is so nasty.
The issue with X is a separate problem.
-Matt
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