Bug 106591 - DKIM signatures
Summary: DKIM signatures
Alias: None
Product: freedesktop.org
Classification: Unclassified
Component: Administration (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: fd.o Admin Massive
QA Contact:
Depends on:
Reported: 2018-05-21 09:25 UTC by Dilian
Modified: 2018-05-21 10:19 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Mail in question (6.35 KB, message/rfc822)
2018-05-21 09:25 UTC, Dilian

Description Dilian 2018-05-21 09:25:14 UTC
Created attachment 139658 [details]
Mail in question

I got the attached sample over lists.freedesktop.org . As you can see in the Authentication-Results header for the libreoffice.org domain, the dkim validation performed by opendkim failed.  

Moreover calling with python3/dkimpy 0.8.8
  import dkim
  print(dkim.verify(open('258620.', 'rb').read()))

also emits False.

Why don't the signature validate?  Was the mail changed on its way?

Why does DKIM-Signature h=.. contain twice from:date: and which software do you use for signing?
Comment 1 Daniel Stone 2018-05-21 10:19:38 UTC
Mailman transforms the mail in ways which break the DKIM signature. We are supposed to be stripping the signature to account for this, but it looks like a change in Mailman upstream meant this didn't always happen.

I've changed the configuration to strip more aggressively now; hopefully that takes care of it. Thanks for the report.

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