Content-Type: multipart/mixed seems to force base64 encoding somehow in Dkim.sign(mail) #32

jschoch · 2021-11-10T20:01:19Z

I have a huge message from aliexpress that when passed through Dkim.sign comes out encoded as base64 and gmail doesn't really like it. If i change the content type to "multipart/alternative" it doesn't end up as base64. I tried to shink it down but that doesn't impact it.

here's the test msg redacted a bit

Feedback-ID: default:present_ae@mail.aliexpress.com:batch:13
Date: Mon, 8 Nov 2021 06:05:17 -0800 (PST)
From: AliExpress <present_ae@mail.aliexpress.com>
To: bob@bob.com
Message-ID: 3197biz_price_reduce_edm:0:0_4659037$074e0a7ae314499f960e4e47fa388cfa
Subject: New price alert for bob
MIME-Version: 1.0
Content-Type: multipart/mixed;
        boundary="----=_Part_133763949_30120080.1636380317614"

------=_Part_133763949_30120080.1636380317614
Content-Type: text/html;charset=utf-8
Content-Transfer-Encoding: quoted-printable

<!--aeug_edm_19435#${houyiJobId}--><!doctype html>
<html xmlns=3D"http://www.w3.org/1999/xhtml" xmlns:v=3D"urn:schemas-microso=
ft-com:vml" xmlns:o=3D"urn:schemas-microsoft-com:office:office">
 <head>=20
  <meta name=3D"viewport" content=3D"width=3Ddevice-width, initial-scale=3D=
1">=20
 </head>=20
 <body style=3D"background: #fff; background-color: #fff;">=20
 
  </div> =20
 </body>
</html><div style=3D"display:none"><img style=3D"display:none" src=3D"http:=
//ae.mmstat.com/ae.edm.edm_open?tracelog=3Drowan-ae_usertouch-aeug_edm_1943=
5_1_en_US-2021-11-08&rowan_msg_id=3D3197biz_price_reduce_edm:0:0_4659037$07=
4e0a7ae314499f960e4e47fa388cfa"/></div>
------=_Part_133763949_30120080.1636380317614--

here's the code that calls the signing

def sign(mail_pipe) do
    
    if mail_pipe.domain == :error, do: raise "signing... domain error"
    
    [rsaentry] =  :public_key.pem_decode(File.read!(@privkey))   
    new_mail = %MimeMail{headers: mail_pipe.stripped_headers,body: mail_pipe.new_mm.body}
    
    to_addresses = Enum.map(mail_pipe.to_list, fn(x) ->
      x.new.address
    end)
    key = :public_key.pem_entry_decode(rsaentry)

    #
    #  Seems fine until this point and it gets base64 encoded
    #
    signed_mail = DKIM.sign(new_mail,key,d: mail_pipe.domain,s: "mail")
    
    raw_signed_mail = MimeMail.to_string(signed_mail)

    Idg.MP.print_report(mail_pipe)
    r = {mail_pipe.from.new.address,to_addresses,raw_signed_mail} 
  end

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Content-Type: multipart/mixed seems to force base64 encoding somehow in Dkim.sign(mail) #32

Content-Type: multipart/mixed seems to force base64 encoding somehow in Dkim.sign(mail) #32

jschoch commented Nov 10, 2021 •

edited

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Content-Type: multipart/mixed seems to force base64 encoding somehow in Dkim.sign(mail) #32

Content-Type: multipart/mixed seems to force base64 encoding somehow in Dkim.sign(mail) #32

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jschoch commented Nov 10, 2021 • edited Loading

jschoch commented Nov 10, 2021 •

edited

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