Date: Tue, 27 Nov 2018 09:06:55 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: Trond =?iso-8859-1?Q?Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> Cc: FreeBSD questions <freebsd-questions@freebsd.org> Subject: Re: Invalid DKIM signatures in this list Message-ID: <20181127020655.GB79319@admin.sibptus.ru> In-Reply-To: <alpine.BSF.2.21.9999.1811261704230.90197@mail.fig.ol.no> References: <20181126125259.GB86999@admin.sibptus.ru> <alpine.BSF.2.21.9999.1811261704230.90197@mail.fig.ol.no>
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Trond Endrest=F8l wrote: > >> Dear Colleagues, >> >> I have noticed that the Mailman which manages this list keeps the sender= 's >> "DKIM-Signature:" header intact but modifies the body of the message by = adding >> a footer. > >Are you sure? Absolutely. You can review this message to the list as a recent example:=20 http://termbin.com/rdsk > >When I received your message, the hash was made up using Message-ID, >Subject, To, From, Date, and In-Reply-To. I failed to find the latter >field. What "latter field" are you talking about? I'm talking about the *body* of the message being tampered with. The hash of the *body* is also=20 signed and present in the DKIM-Signature. --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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