Re: [exim] DKIM problems

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Autor: Tom Kistner
Data:  
Dla: 'Phil Pennock', 'Marcin Mirosław'
CC: exim-users, exim-dev, 'Tom Kistner'
Temat: Re: [exim] DKIM problems
Thanks for checking. I'm traveling and will take a look at this next week.

-----Original Message-----
From: Phil Pennock [mailto:pdp@exim.org]
Sent: Freitag, 2. März 2012 16:13
To: Marcin Mirosław
Cc: exim-users@???; exim-dev@???; Tom Kistner
Subject: Re: [exim] DKIM problems

On 2012-02-20 at 12:14 +0100, Marcin Mirosław wrote:
> W dniu 19.01.2012 22:34, Marcin Mirosław pisze:
> > W dniu 2012-01-19 21:49, Phil Pennock napisał(a):
> >> If you have a copy of such an email which you're willing to share,
> >> then could you please forward it, WITH ALL HEADERS INTACT, to me
> >> and I'll try to find time to take a look.
> >
> > I sended such mail to you offlist.
> > Thank you.
> >
>
> Hello!
> Did you have some time to look into problematic email?


Is it possible that the mail was received using \r line termination, instead of \r\n ?

I think that we have a bug in that case: after the \r, we call
receive_getc() and if the resulting character is *not* \n, then we put it back with receive_ungetc().

Meanwhile, each call to receive_getc() updates DKIM state, so if
receive_ungetc() is ever called, that character will update DKIM state twice.

If you can confirm this, eg with tcpdump, then we may have found the cause.

CC'ing Tom, for confirmation of analysis (I need sleep and may have missed something).

-Phil