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Re: [lamps] header protection: multipart/signed wrapped message

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Fri, 28 May 2021 01:00 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: LAMPS WG <spasm@ietf.org>
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References: <874keparp6.fsf@fifthhorseman.net> <8441B68D-543F-405A-808F-BEF6C045F304@vigilsec.com>
Autocrypt: addr=dkg@fifthhorseman.net; prefer-encrypt=mutual; keydata= mDMEX+i03xYJKwYBBAHaRw8BAQdACA4xvL/xI5dHedcnkfViyq84doe8zFRid9jW7CC9XBiI0QQf FgoAgwWCX+i03wWJBZ+mAAMLCQcJEOCS6zpcoQ26RxQAAAAAAB4AIHNhbHRAbm90YXRpb25zLnNl cXVvaWEtcGdwLm9yZ/tr8E9NA10HvcAVlSxnox6z62KXCInWjZaiBIlgX6O5AxUKCAKbAQIeARYh BMKfigwB81402BaqXOCS6zpcoQ26AADZHQD/Zx9nc3N2kj13AUsKMr/7zekBtgfSIGB3hRCU74Su G44A/34Yp6IAkndewLxb1WdRSokycnaCVyrk0nb4imeAYyoPtBc8ZGtnQGZpZnRoaG9yc2VtYW4u bmV0PojRBBMWCgCDBYJf6LTfBYkFn6YAAwsJBwkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3Rh dGlvbnMuc2VxdW9pYS1wZ3Aub3JnL0Gwxvypz2tu1IPG+yu1zPjkiZwpscsitwrVvzN3bbADFQoI ApsBAh4BFiEEwp+KDAHzXjTYFqpc4JLrOlyhDboAAPkXAP0Z29z7jW+YzLzPTQML4EQLMbkHOfU4 +s+ki81Czt0WqgD/SJ8RyrqDCtEP8+E4ZSR01ysKqh+MUAsTaJlzZjehiQ24MwRf6LTfFgkrBgEE AdpHDwEBB0DkKHOW2kmqfAK461+acQ49gc2Z6VoXMChRqobGP0ubb4kBiAQYFgoBOgWCX+i03wWJ BZ+mAAkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3Jnfvo+ nHoxDwaLaJD8XZuXiaqBNZtIGXIypF1udBBRoc0CmwICHgG+oAQZFgoAbwWCX+i03wkQPp1xc3He VlxHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnaheiqE7Pfi3Atb3GGTw+ jFcBGOaobgzEJrhEuFpXREEWIQQttUkcnfDcj0MoY88+nXFzcd5WXAAAvrsBAIJ5sBg8Udocv25N stN/zWOiYpnjjvOjVMLH4fV3pWE1AP9T6hzHz7hRnAA8d01vqoxOlQ3O6cb/kFYAjqx3oMXSBhYh BMKfigwB81402BaqXOCS6zpcoQ26AADX7gD/b83VObe14xrNP8xcltRrBZF5OE1rQSPkMNy+eWpk eCwA/1hxiS8ZxL5/elNjXiWuHXEvUGnRoVj745Vl48sZPVYMuDgEX+i03xIKKwYBBAGXVQEFAQEH QIGex1WZbH6xhUBve5mblScGYU+Y8QJOomXH+rr5tMsMAwEICYjJBBgWCgB7BYJf6LTfBYkFn6YA CRDgkus6XKENukcUAAAAAAAeACBzYWx0QG5vdGF0aW9ucy5zZXF1b2lhLXBncC5vcmcEAx9vTD3b J0SXkhvcRcCr6uIDJwic3KFKxkH1m4QW0QKbDAIeARYhBMKfigwB81402BaqXOCS6zpcoQ26AAAX mwD8CWmukxwskU82RZLMk5fm1wCgMB5z8dA50KLw3rgsCykBAKg1w/Y7XpBS3SlXEegIg1K1e6dR fRxL7Z37WZXoH8AH
Date: Thu, 27 May 2021 21:00:03 -0400
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Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha256"; protocol="application/pgp-signature"
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Subject: Re: [lamps] header protection: multipart/signed wrapped message
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On Thu 2021-05-27 15:53:04 -0400, Russ Housley wrote:

> I am also unable to verify the signature.  They error seems to
> indicate that the signature is wrong, not that a problem with the
> trust anchor.  I'll send a screen shop privately.

Thanks for the confirmation that it's not just the tooling I happen to
have looked at.

I did a bit more digging and discovered a piece of the python e-mail
message generation tooling didn't work the way i expected it to
regarding CRLF vs LF line endings.  sigh, it's like the gift from the
1980s that just keeps on giving.

I worked around it [0] and re-generated the multipart/signed wrapped
messages, and they now validate correctly in the tools i've tested.
I've just uploaded draft -05 with the fix, and i've updated the
published versions of the test vectors (IMAP, zipped maildir, mbox, etc)
at https://header-protection.cmrg.net/ as well.

The screenshots of balsa, thunderbird, and evolution all now show valid
signatures on the multipart/signed wrapped messages too.

The changes in the draft are extremely minimal [1].  i hope folks will
step up with more testing and review.

        --dkg

[0] https://gitlab.com/dkg/lamps-header-protection/-/commit/aaf5350bb5b170a14a4d85c18344258cb63c2fd4
[1] https://www.ietf.org/rfcdiff?url1=draft-ietf-lamps-header-protection-04&url2=draft-ietf-lamps-header-protection-05

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