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FENRIR
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
Usage
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 !
Troubleshooting
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.
Disclaimer
- 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
Current and planned features
Specific protocol modules have their own separate table below !
| Feature | Current state | Details |
|---|---|---|
| 802.1x tapping and bypass | Done | N/A |
| Stealth | Partially Done | Other specific headers L2/L3 are to be added |
| Autoconfiguration | Done | N/A |
| Reverse connections capabilities | Done | Currently being reworked |
| Port translation | TODO | Collision issue avoidance |
| Runtime interface | Done | N/A |
| Better stats | TODO | |
| Bug smashing | Doing | Bugs, bugs everywhere |
| Code cleaning | Doing | It needs it badly ! |
| Not developed in Java | Done !!! | 'Cause we all know Java sucks right ? :) |
Protocol modules table
| Protocol | Current state | Details |
|---|---|---|
| IP | Done (FENRIR Core) | N/A |
| ARP | Done | N/A |
| ICMP | Done | N/A |
| LLMNR/NBNS (Responder) | Partially Done | Need to push it inside a separate module |
| SSH | TBD | Need to figure out key exchange rewritting |
| SMB | TBD | Next thing on my ToDo list ! |
| ??? | ??? | ??? |
Install
- 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
Important note on install
It seems that with the arrival of Python3 some prerequisite packages are now bugged. For now, to avoid bugs while we migrate this tool to Python3, one should remove any files from the following packages and install them like this:
- sudo -H -E pip install "cmd2<=0.7.0"
- sudo -H -E pip install "scapy<=2.3.2"
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 !
Have a beer and participate !
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 find me on IRC : WaffleWrath
Docs & Vids
My presentation of 802.1x bypass techniques and FENRIR are available on the Hack in Paris website
License
This software is licensed under the terms of the MIT license
by Valérian Legrand (main developer), Andrei Dumitrescu and Quentin Biguenet (contributors)