procmail recipe wanted: clearsigned -> detached signed mail

[Waldemar Brodkorb]

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Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline

Hello Christoph,

* Christoph Hertel wrote:

> Hi,
> 
> a while ago (a year or so, maybe even on another ML, I'd be sorry for
> that :), in one of those clearsigned vs. detached/MIME-signed e-mail
> discussions, I read about a procmail recipe that rewrote a clearsigned
> e-mail in a MIME-message with a detached signature. At the time, I
> did not have the possibility to use procmail, but now..
> 
> Did I just dream of this, or is there really something like it? Can
> somebody point me somewhere?

.procmailrc
--------------------------------------------------------------
MAILFILTER_PGP_ATTACHMENT=${HOME}/bin/mailfilter_pgp_attachment
# Get non-MIME encrypted and signed Messages
:0
* !^Content-Type: message/
* !^Content-Type: multipart/
* !^Content-Type: application/pgp
{
  :0 fBw
  * ^-----BEGIN PGP MESSAGE-----
  * ^-----END PGP MESSAGE-----
  | formail -i "Content-Type: application/pgp; format=text; x-action=encrypt"

  :0 fBw
  *  ^-----BEGIN PGP SIGNED MESSAGE-----
  *  ^-----BEGIN PGP SIGNATURE-----
  *  ^-----END PGP SIGNATURE-----
  | formail -i "Content-Type: application/pgp; format=text; x-action=sign"
}

:0 fBw
* ^-----BEGIN PGP PUBLIC KEY BLOCK-----
* ^-----END PGP PUBLIC KEY BLOCK-----
| formail -i "Content-Type: application/pgp-keys; format=text;"

:0
* ^Content-Type: multipart/
{
  :0 fBw
  * ^-----BEGIN PGP MESSAGE-----
  * ^-----END PGP MESSAGE-----
  | $MAILFILTER_PGP_ATTACHMENT -
}

----------------------------------------------

mailfilter_pgp_attachment atached.
I hope 0.8 kbytes is not to much. 

cya
Waldemar

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--OaZoDhBhXzo6bW1J
Content-Type: application/x-bzip2
Content-Disposition: attachment; filename="mailfilter_pgp_attachment.bz2"
Content-Transfer-Encoding: base64

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