topic Re: For Blocking Sendmail Users for sending mails in Operating System - Linux

For Blocking Sendmail Users for sending mails

Sachin_48 — Wed, 05 Jul 2006 09:08:48 GMT

Hi All,

I want to block some users automatically and to unblock them also but without using the /etc/mail/access file .

Can somebody tell me what should I do
Or what are the available options for blocking the users for mail access.

Pls revert.

Thanks
Sachin Rajput
HCL
===============

Re: For Blocking Sendmail Users for sending mails

Andrea Rossi — Thu, 06 Jul 2006 07:49:23 GMT

Maybe you want users to neither access their mailbox, isn't it? This doesn't concern sendmail, but, say, imap or pop3 daemon.

Re: For Blocking Sendmail Users for sending mails

Steven E. Protter — Thu, 06 Jul 2006 08:45:26 GMT

Shalom,

#!/bin/sh

TARGET=$1

/sbin/iptables -I INPUT -s $TARGET -j DROP

Make target the IP address of the offending user.

The way to block mail is to use the access file.

I can provide you a script that will modify it with relative ease. Interested?

SEP

Re: For Blocking Sendmail Users for sending mails

Sachin_48 — Sat, 08 Jul 2006 04:01:04 GMT

Dear Steven,

You pls give me that script also .

And pls tell me if there is any other way .

I can block users using /etc/pam.d/smtp but unable to revert them back by removing the same entries.

Thanks
Sachin Rajput
====================

Re: For Blocking Sendmail Users for sending mails

Ivan Ferreira — Mon, 10 Jul 2006 09:23:25 GMT

Probably, you can use SMPT AUTH like in this example:

http://www.jonfullmer.com/smtpauth/

To send a mail, users must authenticate using their accounts, so, if yo lock the account with "usermod -L", they won't be able to send mails.

Re: For Blocking Sendmail Users for sending mails

Steven E. Protter — Mon, 10 Jul 2006 13:40:07 GMT

Shalom,

Sorry I'm late with this, I had to take out my customizations:

newaliases
cd /etc/mail
makemap -r -v hash access.db < access
makemap -r -v hash domaintable.db < domaintable
makemap -r -v hash genericstable.db < genericstable
makemap -r -v hash mailertable.db < mailertable
makemap -r -v hash virtusertable.db < virtusertable
cp /etc/mail/sendmail.cf /root
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

You place your entries in the access file

192.168.0.10 554 Not permitted,
192.168.0.20 RELAY
192.168.0.30 OK

Run the above script and you have blocked sendmail.

SEP