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FENRIR is a tool designed to be used "out-of-the-box" for penetration tests and offensive engagements. Its main feature and purpose is to bypass wired 802.1x protection and to give you an access to the target network.

Keep in mind FENRIR is still a Work in Progress

Branches :

• master : main branch for (relatively) stable code
• bleeding : branch with hotfixes and latest updates

FENRIR must be ran as root and you must have 2 network interfaces if you want it to work Also, check that both network interfaces are in promisc mode and that ip_forwarding is enabled (see Install section)

To run it :

sudo python Interface.py

Notice that FENRIR's interface supports autocompletion

You can run shell commands with "!"

!ls -la

You first have to create a virtual tap for FENRIR with :

create_virtual_tap

Then you can either configure it manually or start autoconfiguration :

set <option> <value>
autoconf

Once FENRIR is configured you can run it normally or in debug mode

run
run_debug

The wiki pages are coming shortly with examples and better explanations !

Are you interfaces in promisc mode ? Even FENRIR's tap interface ?
You external interfaces must not have an IP address, only the tap hsould have one
Your default route should be pointing to the tap interface
Have you enabled ip_forwarding ?
FENRIR will tell you if it is lacking configuration. It must have at least the legitimate host IP and MAC addresses.
Not all protocols are currently supported ! But feel free to help the project by creating a module !
If you have found a bug, report it to me ! I'll look at it as quickly as i can.

• I suck at naming stuff & especially function names
• The code is always a work-in-progress, there are bugs and weird stuffs ! Feel free to throw bug tickets & pull requests
• Java sucks

Specific protocol modules have their own separate table below !

• apt-get update
• apt-get upgrade
• apt-get install python-pip
• apt-get install build-essential
• apt-get install python-dev
• pip install python-pytun
• pip install scapy
• pip install Cmd2
• git clone this repo

For running FENRIR

• sysctl net.ipv4.ip_forward=1
• ifconfig iface1 promisc
• ifconfig iface2 promisc

If you have any problem with installation, shoot me an email ! I can probably help you out !

The project is open for pull requests and bug reports ! The great thing is I would be more than happy to offer you a beer for any form of contribution. Please participate in this project and help me make it better :)
And if you don't know where to start or want some help, do not hesitate to contact me !

Also, if you want to chat about the project or ask questions, you can shoot me an email at [email protected] or you can also find me on IRC : WaffleWrath

My presentation of 802.1x bypass techniques and FENRIR are available on the Hack in Paris website

This software is licensed under the terms of the MIT license

by Valérian Legrand