DKIM #21

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1. icgood commented on Apr 1, 2014

   

   icgood

   on Apr 1, 2014

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   There should be! I haven't had need for it yet, but the dkimpy project appears to be perfect for the job. It probably won't take long to add.
2. rgcarrasqueira commented on Apr 7, 2014

   

   rgcarrasqueira

   on Apr 7, 2014

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   Hi Ian,

   I've tried to use DKIM, it signs the message but I'm having problem to sign correctly the message. I've created an Edge that write and sign my email messages there but, the always appear a error about messagen content changed and the sign fails. There is correctly place (Edge, StaticRelay or other..) to put the message to sign and send it correctly?

   Thanks so much!

   Rogério Carrasqueira
3. rgcarrasqueira

   closed this as completedon Jul 11, 2014
4. blackrosezy commented on Jul 15, 2014

   

   blackrosezy

   on Jul 15, 2014

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   hi rgcarrasqueira,

   Why do you close this issue? Do you manage to solve it?
5. rgcarrasqueira commented on Jul 18, 2014

   

   rgcarrasqueira

   on Jul 18, 2014

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   Yes We solved! Thanks

   Rogério Carrasqueira

   ---

   e-mail: rogerio.carrasqueira@gmail.com
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   2014-07-14 23:24 GMT-03:00 Mohd Rozi notifications@github.com:

   hi rgcarrasqueira,

   Why do you close this issue? Do you manage to solve it?

   —
   Reply to this email directly or view it on GitHub
   #21 (comment).
6. reikjarloekl commented on Apr 4, 2015

   

   reikjarloekl

   on Apr 4, 2015

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   hi rgcarrasqueira,

   could you elaborate on how you managed to get it to work? I am looking at the same problem right now.

   thanks and best regards,

   Jörn
7. icgood

   reopened this on Jun 18, 2019
8. zombified commented on Mar 18, 2024

   

   zombified

   on Mar 18, 2024

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   no relation to the original poster or other solutions, but for reference, the things that are needed to get dkim integrated in a custom deployment would be:

   1. creating a subclass of slimta.policy.RelayPolicy and writing an "apply" method that uses dkimpy to generate the signing header based on the info in the given envelop, and then appends the signature to the envelope
   2. add the policy to the relay object being used (eg slimta.relay.smtp.mx.MxSmtpRelay or some subclass of it)

   it should only be ~120 lines of code at most for the specific needs of dkim, and that's pretty generous

   the core of the custom policy is going to be something like this (example, non-functional):

   header_data, message_data = env.flatten()
   rfc822msg = "{}{}".format(header_data.decode(), message_data.decode())
   
   # defaults for the dkimpy library
   ident = None
   canon = (b'relaxed', b'relaxed')
   algo = b'rsa-sha256'
   length = False
   
   sig = sign(rfc822msg.encode(),
       selector.encode(),
       domain.encode(),
       privkey.encode(),
       identity=ident,
       canonicalize=canon,
       signature_algorithm=algo,
       include_headers=headers,
       length=length,
       logger=logger)
   sigd = sig.decode()[16:].rstrip()
   # there really should just be one dkim signing header
   del env.headers['DKIM-Signature']
   env.prepend_header("DKIM-Signature", sigd)