We are using exim-4.12 in some locations and exim-4.34 in other locations.
Lekshmi A. R.
----- Original Message -----
From: Lekshmi A. R
To: dot@???
Cc: exim-users@???
Sent: Tuesday, May 16, 2006 12:19 PM
Subject: Re: [exim] how to confirm that user is sending mail from the id,with which he authenticated himself
Our existing ROUTERS CONFIGURATION is as follows.
system_aliases:
driver = redirect
domains = xyz.co.in
allow_fail
allow_defer
data = ${lookup{$local_part}lsearch{/etc/aliases}}
file_transport = address_file
pipe_transport = address_pipe
xyzhub:
driver = manualroute
domains = xyz.co.in
transport = remote_smtp
route_data = <<one ip address>>
smart_host:
driver = manualroute
domains = !+local_domains
transport = remote_smtp
route_data = <<another ip address>>
no_more
Can u explain how to modify this routers, so that even authorised senders will not be able to fake their adresses.
Lekshmi A. R.
----- Original Message -----
From: Tony Finch
To: Lekshmi A. R
Cc: exim-users@???
Sent: Monday, May 15, 2006 4:50 PM
Subject: Re: [exim] how to confirm that user is sending mail from the id,with which he authenticated himself
On Mon, 15 May 2006, Lekshmi A. R wrote:
> I have one problem. I have an exim mail server. I have even
> configured cyrus-sasl-pwcheck to do SMTP-AUTH. It is checking
> /etc/passwd file to do the authentication. Now the problem is even if
> the user who is trying to send a mail doesn't have a valid id in the
> server, he can authenticate himself with someother users id and send
> mail in his name.
In your localuser router, set address_data to the username that
corresponds to the address. This will then be available in
$sender_address_data in the ACLs after you have run verify=sender. Exim's
routing will trace through the aliases and eventually work out the
username as a side-effect. You can then compare it to $authenticated_id,
and reject the message if they don't match. For more deails have a look at
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20041101/msg00107.html
Tony.
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