Assignment 4: The Client

Configuration and checking of a client mail service (SMTP/IMAP) [MUA]: POSTFIX/Dovecot client side

The time has come for us to focus on the client side, using the frontend VM as a MUA. Also, we will use mutt to connect to MTA and use the IMAPS protocol to download the user mail.

You will have completed some of the following tasks, so you only have to check them.

1. Make sure that frontend VM is configured as client of the secure information server (server-01) and the network file server (server-03) implemented in Lab1, Lab2 and Lab3.

   • LDAP client:

     Our new server will be able to use the LDAP directory in a safe way (SSL) to identify and authenticate users who are managed by LDAP on server-01/server-02.

     • Add LDAP services on server-01/server-02 as user/host identification method.

     • Reconfigure the frontend VM to enable LDAP authentication for the SSH service

   • NFS client: Using the NFS service on server-03, frontend should mount on demand, using autofs, the user’s home directories, located in /export/home (server-03) on the local directory /remote/home/

2. Configure frontend VM as client of the secure MAIL server (server-05)

   • Be sure that LDAP users are able to connect to frontend using SSH connections.

   • Then, LDAP users, properly configure the mutt mail client using .muttrc file. All of them should be able to access its mail account in a secure way:

     set mbox_type=Maildir
     set from $LOGNAME@localdomain
     # IMAP
     set folder="imaps://$[e-mail]/~/Maildir/"
     set spoolfile="imaps://$[e-mail]/"
     set imap_user = $LOGNAME
     set imap_authenticators="login"
     # SMTP
     set smtp_url = "smtp://server-05.localdomain:25"
     set ssl_force_tls = no
     set ssl_starttls = no

3. Checking:

   • Test 1:

     • From server-05 (root), send an email to every LDAP user:

       1. $ echo “Hello, I’m root” |mail –s $HOSTNAME user1@localdomain

     • Check mail for both users:

       1. Open a SSH session on frontend as user1

       2. Check mail using mutt

   • Test 2:

     • From frontend, (user1), send an email to user2@localdomain using mutt

     • Check user2’s mail.

   • Test 3:

     • From frontend, (user2), send an email to support@localdomain using mutt

     • Check user1’s mail.