On Sat, 29 May 1999 13:04:37 +0300
Vadim Vygonets <vadik@???> wrote:
> Quoth J C Lawrence on Fri, May 28, 1999:
>> Given messages that arrive in Exim's queue from <where-ever>, how
>> can I configure Exim such that all outbound messages which
>> contain a specified header field are processed by a defined
>> script which edits the message contents?
> Yes, with a system filter.
True, but that gets painful for what I need to do. The short story
on what I'm attempting is to set up a crypted mailing list:
1) Messages are sent to the list either in plain text or crypted
with the list's public key
2) An Exim filter decrypts any crypted messges and adds a custom
header to the message to indicate such.
3) The list then broadcasts the messages to the subscribers.
4) An Exim router intercepts the outbound messages, and re-crypts
those with the custom header with each recipient's individual
key (no key group, individual messages/crypts).
Yes, I know all the scalability problems. I've also seen how many
have tried this and given up. No, I'm not going to use
PGPsendmail/PGPdaemon.
It looks like I can do the above as follows (untested, so
corrections and comments ___extremely___ welcome):
if $local_part does not begin "crypt-" then
finish
else if $message_body contains "-----BEGIN PGP MESSAGE-----" then
if $header_X-Crypt: is not "yes" then
headers add "X-Crypt: yes"
endif
pipe "uncrypting.filter ${local_part}-real"
finish
else
headers add "X-Crypt: no"
deliver ${local_part}-real
endif
Where the list names all begin with "crypt-", <listname>-real is the
actual address that reaches the mailing list (the first address just
hits the decrypt filter), and "uncrypting.filter ${local_part}-real"
uncrypts any crypted blocks and then pipes the resultant message
back to the MTA as a new message (I'm ignoring envelope problems for
now) targetted at <listname>-real.
For the outbound side it looks like I can use a transport/router something
like:
secure_smtp:
size_addition = -1
transport_filter = "crypter.py $pipe_addresses"
secure_delivery:
senders = crypt-*@???
headers_remove = "X-Crypt"
transport = secure_smtp
Does this look like it will work?
> From your description I can hardly understand what exactly you
> want, so I can't help you further...
Hopefully the above clarifies.
>> ... Beware of cromagnons wearing chewing gum and palm pilots ...
> Nice!
<bow>
--
J C Lawrence Home: claw@???
---------(*) Linux/IA64 - Work: claw@???
... Beware of cromagnons wearing chewing gum and palm pilots ...
--
*** Exim information can be found at
http://www.exim.org/ ***
