s talk about some activities to get ready for when the warmer weather approaches.
Lecturers’ Conference will be August 5, 6 & 7 at the Devens Common Center in Devens, Massachusetts. This will be a new and different type of conference aimed at helping Lecturers plan better programs. Each State will no longer put on a complete program. Instead, each State will put on one number in a Northeast Program. Our number will be a George and Harriet skit entitled “The Farmer’s Wife” written by Nancy Weissmuller. There will be more workshops than there has been in the past and also ways for you to meet and greet Grangers from other States. Make your plans now.
Grange Sunday will be held at Cheshire Grange Hall on Sunday, June 9. All numbers in both the “A Number” and the Talent Contest go right to Cheshire for Judging on a State Level.
Every Grange in the State should be able to have an “A Number” entry. The theme this year is “Holidays”. This can be on any recognized holiday. Any number suitable for a Grange Meeting is eligible. Time Limit: 6 minutes (includes set-up and performance). Numbers will be judged on presentation, quality, audience appeal, appropriateness of theme, and originality.
Have Talent? Why not show it off in our Talent Contest? Performance time allowed is six minutes. State winners will be eligible to perform at Lecturers’ Conference and at National Session.
Hope to see you at Leaders’ Conference and around the State.
Rated 3<reponame>LouisNitag/ModbusIDS<gh_stars>0
# ModbusTCP sniffer

## Description

This program is a PoC to raise alarms on a PLC if unauthorized ModbusTCP packets
are seen on the network, thus warn the operator as early as possible.

Example: an HMI talks to a PLC using ModbusTCP. A computer running this program
can be place on a network hub, thus sniffing every packet sent to both HMI and
PLC.

Warning: this tool does not protect against attacks. It shows up that something
could be wrong.

## Licence

This program is under [Beerware Licence](https://fr.wikipedia.org/wiki/Beerware).
> As long as you retain this notice you can do whatever you want with this
> stuff. If we meet some day, and you think this stuff is worth it, you can buy
> me a beer in return.

## Dependancies

* `python >= 3.7`
* `pyModbusTCP >= 0.1.7`
* `scapy >= 2.4.2`

## Usage

You may need root privileges to launch the utility.

```
usage: sniffer.py [-h] [-i INTERFACE] [-p PORT] [-a ALERT]
                  [authorized_hosts [authorized_hosts...]]

Sniff ModbusTCP packets on network and raise alarms if intrusions are detected

positional arguments:
  authorized_hosts      list of authorized hosts

optional arguments:
  -h, --help            show this help message and exit
  -i INTERFACE, --interface INTERFACE
                        Interface
  -p PORT, --port PORT  Port to listen to
  -a ALERT, --alert ALERT
                        Modbus server to raise alert
                        <address>:[<port=502>]/<register>
```

## Example

A HMI (`192.168.0.10`) is talking to a PLC (`192.168.0.11`). This PLC have a
Modbus register dedicated to network alerts (`42`).
A micro-computer (`192.168.0.20`) is dedicated to monitoring the network on its
interface `eth1`.

All these devices are linked throug a network hub, thus the computer has access
to trames sent to both PLC and HMI. The sniffer is lauched this way:

```
#./sniffer -i eth1 -a 192.168.0.11:/42 192.168.0.10 192.168.0.11
```

If the sniffer catch a illegitimate request from some host, it will write `1`
into the Modbus register `42` of the PLC. Since the HMI is configured to raise
an alert when this register is modified, the operator will see that someone try
to access the Modbus bank of the PLC.

## Disclaimer

I provide this program as a proof of concept. Since ModbusTCP is clearly
depreciated, you should use another more secure protocol instead of using tools
like this.
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