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Published on March 20th, 2017 | 261 views Post Views

BGP Hijack Detection: TaBi

Developed since 2011 for the needs of the French Internet Resilience Observatory, TaBi is a framework that ease the detection of BGP IP prefixes conflicts, and their classification into BGP hijacking events. The term prefix hijacking refers to an event when an AS, called an hijacking AS, advertises illegitimately a prefix equal or more specific to a prefix delegated to another AS, called the hijacked AS.

Usually, TaBi processes BGP messages that are archived in MRT files. Then, in order to use it, you will then need to install a MRT parser. Its favorite companion is MaBo, but it is also compatible with CAIDA’s bgpreader. Internally, TaBi translates BGP messages into its own representation. Therefore, its is possible to implement new inputs depending on your needs.

 

Building TaBi

TaBi depends on two external Python modules. The easiest method to install them is to use virtualenv and pip.

If you use a Debian-like system you can install these dependencies using:

apt-get install python-dev python-pip python-virtualenv

Then install TaBi in a virtual environment:

virtualenv ve_tabi
source ve_tabi/bin/activate
pip install py-radix python-dateutil
python setup.py install

Removing TaBi and its dependencies is therefore as simple as removing the cloned repository.

 

Usage

Historically TaBi was designed to process MRT dump files from the collectors of the RIPE RIS.

Grabbing MRT dumps

You will then need to retrieve some MRT dumps. Copying and pasting the following commands in a terminal will grab a full BGP view and some updates.

wget -c http://data.ris.ripe.net/rrc01/2016.01/bview.20160101.0000.gz
wget -c http://data.ris.ripe.net/rrc01/2016.01/updates.20160101.0000.gz

 

tabi – the command line tool

The tabi command is the legacy tool that uses TaBi to build technical indicators for the Observatory reports. It uses mabo to parse MRT dumps.

Given the name of the BGP collector, an output directory and MRT dumps using the RIS naming convention, tabi will follow the evolution of routes seen in MRT dumps (or provided with the --asesoption), and detect BGP IP prefixes conflicts.

Several options can be used to control tabi behavior:

$ tabi --help
Usage: tabi [options] collector_id output_directory filenames*

Options:
  -h, --help            show this help message and exit
  -f, --file            files content comes from mabo
  -p PIPE, --pipe=PIPE  Read the MRT filenames used as input from this pipe
  -d, --disable         disable checks of the filenames RIS format
  -j JOBS, --jobs=JOBS  Number of jobs that will process the files
  -a ASES, --ases=ASES  File containing the ASes to monitor
  -s, --stats           Enable code profiling
  -m OUTPUT_MODE, --mode=OUTPUT_MODE
                        Select the output mode: legacy, combined or live
  -v, --verbose         Turn on verbose output
  -l, --log             Messages are written to a log file.

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Among this options, two are very interesting:

  • -j that forks several tabi processes to process the MRT dumps faster
  • -a that can be used to limit the output to a limited list of ASes

Note that the legacy output mode will likely consume all file descriptors as it creates two files per processed AS (i.e. around 100k opened files). The default is the combined output mode.

Here is an example call to tabi:

tabi -j 8 rrc01 results/ bview.20160101.0000.gz updates.20160101.0000.gz

After around 5 minutes of processing, you will find the following files in results/2016.01/:

  • all.defaults.json.gz that contains all default routes seen by TaBi
  • all.routes.json.gz that contains all routes monitored
  • all.hijacks.json.gz that contains all BGP prefix conflicts

 

https://github.com/ANSSI-FR/tabi

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