Assignment 2

Purpose

In this assignment, you will use the 335assign virtual network and the seedling cloning-source that you created in assignment 1 (part 1) to create two e-mail servers: a Mail Transfer Agent called pine and a Message Store (IMAP) called fir. You will also use the seedling cloning source to create a Samba server called bristlecone. In addition to creating those Linux servers, you will also be required to create a virtual machine for an MS Windows operating system to test-out your Samba server. As you perform and submit this assignment, you MUST run at least the balsam Master Name server in order to resolve domain names to IP addresses.

General Requirements

Weight: 10% of the overall grade

Due Date: During Week 13 (in class)

Detailed Requirements

It is YOUR responsibility to Backup all of your VMs for this Assignment!
You are required to frequently backup your VMs prior to exiting a work session during this assignment. Your instructor will NOT accept the fact that your hard disk crashed and lost all of your work. If you properly backed up your VM images and xml configuration files to a USB, then you can purchase a new hard-disk or wipe and recreate your hard disk and restore your VMs. Students who fail to submit their assignment #2 by the last day of scheduled classes will receive an INC grade (assuming they passed all of the other requirements for this course) and will be required to show their instructor their working assignment #2 no later than 4PM on the first Tuesday of the next semester; otherwise, they will fail the course. Students with accommodations should discuss arrangements regarding due dates / submission of assignment #2. Students that are missing both of assignment #1 and assignment #2 will fail this course.

Set-up Mail Transfer Agent (pine)

Perform the following steps for this section:

1. Create a clone virtual machine called pine from the seedling cloning-source. Refer to the table below for address and hostname.
2. The normal user on your host machine must be able to ssh to the root account on each machine without being prompted for a password.
3. Create a regular user for this virtual machine using your Seneca userID.
4. Any machine within the coniferous.trees.ops domain will be able to route outgoing email through this server.
5. Any mail sent directly from this machine will use the domain as the sending address (i.e. user@coniferous.trees.ops)
6. You are NOT required to encrypt received email messages.
7. This machine will relay received email messages for any user account in the coniferous.trees.ops domain.

Set-up Mail Delivery Agent / Message Store (fir)

Perform the following steps for this section:

1. Create a clone virtual machine called fir from the seedling cloning-source. Refer to the table below for address and hostname.
2. Create a regular user for this virtual machine using your Seneca userID.
3. The root user on your host machine must be able to ssh to the root account on each machine without being prompted for a password.
4. This machine will accept incoming email for any user account in the coniferous.trees.ops domain.
5. No other machine in this domain will accept incoming email.
6. This machine will be an IMAP server (i.e. NOT POP3 or LTMP).
7. This machine will NOT use encryption.
8. This machine will use postifx's built-in LDA to store received emails in maildir format in a sub-directory of each users' home directory called mailboxes.
9. Any mail sent to root will be automatically delivered into the mailbox of the regular user created above.
10. Configure your Thunderbird application (installed in Lab 4b) to allow the user to send and receive email messages using the pine and fir servers.

Add MX records to the forward lookup zone on your balsam DNS server so that all incoming mail addressed to the domain is sent to your IMAP server (fir) first, and the MTA (pine) as a fall-back.

Set-up a Samba Server (bristlecone)

Perform the following steps for this section:

1. Create a clone virtual machine called bristlecone from the seedling cloning-source. Refer to the table below for address and hostname.
2. Create a regular user for this virtual machine using your Seneca userID.
3. It will run Samba (automatically on boot) to share files with machines in this network. You may reuse the Windows installation from the lab or create a new one for the assignment.
4. Create five new users on the Samba file server, call them yoursenecaid-1, yoursenecaid-2, yoursenecaid-3, yoursenecaid-4, yoursenecaid-admin. (replace "yoursenecaid" with your actual Seneca ID)
5. Create a directory /documents with the following subdirectories:

.
├── private
│   ├── yoursenecaid-1
│   ├── yoursenecaid-2
│   ├── yoursenecaid-3
│   ├── yoursenecaid-4
│   └── yoursenecaid-admin
└── shared
    ├── readonly
    └── readwrite

6. Set up permissions/ownership on those directories for your Linux users on the file server so that:
   1. yoursenecaid-1 through yoursenecaid-4 have read/write access to their own private directories.
   2. yoursenecaid-admin has read/write access to every directory.
   3. Everyone has read access to the readonly directory (but only the admin has write access too).
   4. Everyone can both read and write to the readwrite directory.
7. Set up five Samba users to mirror your new Linux users.
8. Configure seven shares (one for each directory above) with permissions as close as possible to the Linux permissions.

Set-up Windows Client to Test Samba server (windows)

Perform the following steps for this section:

1. Create a clone virtual machine called client from the seedling cloning-source. Refer to the table below for address and hostname.
2. Create a regular user for this virtual machine using your Seneca userID.
3. The normal user on your host machine must be able to ssh to the root account on each machine without being prompted for a password.
4. This machine will use the master and slave DNS servers in your domain as the primary and secondary DNS servers. It will not have access to any other DNS servers.

Network Configuration

As you will now have functioning primary and secondary DNS servers, modify your network configuration file for the pine, fir, and bristlecone servers specify the correct IPADDR.

Table of Virtual Machines / DNS Records

Below is network configuration for ALL virtual machines used in this assignment and previous assignments for this course:

Hostname	Address	Purpose
larch.coniferous.trees.ops (your existing host)	External Facing Address: DHCP assigned Internal Virtual Bridge (virbr1): 172.30.20.1	Your host machine
seedling.coniferous.trees.ops	172.30.20.100	Cloning-source used to create other servers for other assignments.
balsam.coniferous.trees.ops	172.30.20.2	Master Name Server
spruce.coniferous.trees.ops	172.30.20.3	Slave Name Server
pine.coniferous.trees.ops	172.30.20.5	SMTP mail Server
fir.coniferous.trees.ops	172.30.20.6	IMAP mail Server
bristlecone.coniferous.trees.ops	172.30.20.8	Samba Server
windows.coniferous.trees.ops	172.30.20.10	Client Linux or Windows Server

Set-up Firewall Policies

In addition to the basic firewall established in assignment 1, ensure the following restrictions are met:

1. All virtual machines will use iptables as their firewall.
2. Outgoing traffic is allowed.
3. Each virtual machine must be able to check for and install updates using yum.
4. Traffic on the loopback interface for each virtual machine is allowed.
5. The host machine (and only the host machine) must be able to ssh to them.
6. ICMP traffic is allowed if it originated within the local network only.
7. Other than that, only the traffic necessary to support their roles described above should be allowed.

Assignment Submission

The student is required to prove to their professor that their set-up works correctly during the regularly-scheduled lab period.

Assignment Evaluation Details

• Demonstrate working assignment to your instructor in class:
  1. Students need to demonstrate their assignment functionality to their professor during a lab period
     (like you would for any lab for "sign-off").
  2. Students are required to prepare everything ahead of time so that you can quickly demonstrate to your instructor that all required parts of your assignment are working.
  3. Do do proceed to the next step until you have demonstrated your assignment to your instructor to check for errors that may cause problems when running the checking script.
     
     

• Download and run a shell script to check your work (Depending on your OPS335 Instructor):

Peter Callaghan's Classes (Sections C & D):

• Refer to instruction on Moodle to download and run marking shell script.

Murray Saul's Classes (Sections A & B):

1. Login as root on your host machine.
2. Change to the /root/bin directory.
3. Make certain that at least your balsam, pine, fir, bristlecone and client virtual machines are running.
4. Issue the command to download a checking script for your assignment to your host machine:

   wget http://matrix.senecac.on.ca/~murray.saul/ops335/check-assn2.bash    # Currently not available

5. Set execute permissions and run the command: /root/bin/check-assn2.bash
   (You shell script contents will be mailed to your Seneca email and to your OPS335 instructor's Seneca email. If you do NOT receive an e-mail message in your Seneca email account, then there is a problem, and you MUST rerun or contact your OPS335 instructor immediately.
   
   

• Additional Assignment Information:
  1. This assignment is to be completed individually. Group submissions are not allowed.
  2. You are NOT allowed to use local hostname resolution (i.e. no entries in your /etc/hosts file).
  3. Test your machine to make sure it works. If a machine is not accessible (e.g. will not boot, can not be accessed through ssh from your host, etc.), or is otherwise non-functional, you may be told to resubmit.
  4. Late submissions are a subject to a penalty of 10% per day.

Evaluation Rubric

Here is an evaluation rubric (in table form) showing you how you will be evaluated for this assignment. Part of the rubric is marked from professor observation from student demonstration of assignment in class, and the other part is based on output from the results of an assignment checking script that the student will download and run.

Student Demonstration (in class)
Evaluation Item	Mark
STMP and IMAP Servers:
Proof of SMTP Server Running on pine server	/1
E-mails sent from pine and bristlecone servers to fir server (user@IP_ADDR)	/1
E-mails sent from pine and bristlecone servers to fir server (user@DOMAIN_NAME)	/1
Samba Server Access via Windows OS:
yoursenecaid-1 through yoursenecaid-4 has read/write access	/1
yoursenecaid-admin has read/write access to every directory	/1
All accounts have read' access to the read-only directory (but only yoursenecaid-admin has write access)	/1
All accounts can both read and write to the readwrite directory.	/1
Configuration (Checking Script Output)
Evaluation Item	Mark
Mail Transfer Agent (pine) - General Configuration
Postfix MTA settings	/5
Mail Delivery Agent (MTA) / Message Store (MS) - General Configuration
Postfix MTA settings	/3
LDA settings	/1
AA settings	/4
DNS configuration
Correct MX records exist	/2
MX records prioritize access to mail servers correctly	/2
Samba Server - General Configuration
Directories shared with correct permissions	/7
Samba accounts created (1/2 mark each)	/2
Writing allowed to directories	/1
Firewall policies
MTAs allow SMTP traffic	/2
AA allows IMAP traffic	/1
IMAP traffic limited to local network	/1
Samba server allows samba traffic	/1
Samba traffic limited to local network	/1
Less Deductions (half-mark for EACH VM): DOMAIN Name NOT Resolved VM hostname NOT set firewalld enabled / running iptables disabled / not running No Yum update Services NOT active Local hostname resolution appears in /etc/hosts (1 mark per entry, per vm) Neglecting major safeguards (e.g. no firewall present, firewall allowing all traffic, no active SELinux) (4 marks per issue)
TOTAL	/40