This has now been automated with Ansible. The install.sh bash script will be left as is for those who do not wish to use Ansible, but all future updates will use Ansible. I will be updating the instructions to use Ansible.
If you would like to still use the old install.sh bash script access those instructions here
This repository contains Ansible playbooks which will automatically deploy a Network Security Monitoring (NSM) kit, which includes Elasticsearch, Kibana, Filebeat, Zeek, and Suricata. The purpose of this project is to simplify the setup process and provide an efficient method for deploying a light weight, fully functional NSM environment.
These playbooks can be used to setup an NSM kit on a remote machine or locally to setup an NSM kit on your local machine.
Out of the box I've included a few PCAP files which can be used to provide some test logs to work through. If you have a promiscuous interface setup and would prefer to capture from that, I'll provide instructions for that as well.
This could also be used as a good starting point to teach yourself how to setup an NSM kit. By having a known good setup, you can be free to play around, break things, fix them (or scrap it and reinstall), etc.
The NSM kit is designed to provide a comprehensive network monitoring solution by integrating the following components:
This script has been built and tested with Alma Linux 9.1 Download Alma Linux 9.1 ISO. If you would like support for another linux distro, open an issue and I will be more than happy to create an install script for said distro.
I have tested this down to 2 CPU's and 4Gb RAM. More is recommended but it will install successfully on that.
It is required that you have sudo permissions and have git and Ansible installed. If you don't have git, you can install it with the following command:
sudo dnf install git -y
For Ansible:
sudo yum install ansible -y
Simply run the following commands to get this up and running. The time it takes to install varies depending on your hardware and network speed. Generally the more CPU cores you have the faster the install will be.
git clone https://github.com/jonezy35/NSM-Lite.git
cd NSM-Lite
You will then need to edit the inventory.yml file to specify where you want to install.
If you want to install on a remote machine you will uncomment lines 6-9 and it will look like the following:
If you don't have an ssh key file and don't want to generate one, you can leave line 9 commented out and add --ask-pass to every command you run (to authenticate with the remote machine).
If you wish to test your ansible connection to the remote host, you can use the ping_test.yml playbook provided. Simply run:
ansible-playbook playbooks/ping_test.yml
If you setup your inventory file correctly, you should get green "ok" response.
If you want to install on your local machine you will uncomment lines 11 and 12 and it will look like the following:
Once you have edited and saved your inventory.yml file, you can now install with:
ansible-playbook playbooks/NSM_install.yml --ask-become
--ask-become will prompt for the sudo password for the machine you are installing the NSM kit on.
The playbook will then prompt you to input your desired password for the elastic user and the kibana_system user.
Once installed, you can access kibana at http://<your IP>:5601
The default login credentials are elastic and <the password you chose for the elastic user>
The install can take awhile depending on how many CPU cores you have and what other processes you are running. However, the install is completely automated after this step, so feel free to walk away, have some coffee, play some video games. The NSM install will be ready for you when you return.
Once the installation is complete, you can utilize the provided PCAP to create logs for analysis with the following command:
ansible-playbook playbooks/run_pcap.yml --ask-become
This playbook will populate your kibana dashboard/ discover with logs from February of 2022 for analysis.
There are a few PCAP files available in the pcap folder. They are all zipped up, and are password protected with the password infected. To unzip them simply run unzip <pcap>.pcap I pulled all of these from the Malware Traffic Analysis website. They provide exercises with PCAP and associated answer keys/ quizzes. With this setup, you will be able to pull down any PCAP you want and run it through.
If you want some larger PCAP to run through, I have a .zip file with 17G of PCAP here which is stored in a ~ 4GB zip file. You can download it with gdown and unzip it with tar:
pip install gdown
gdown --id 1B46N6Uqtvz9w-lzwzOV344-ArFPXyAfQ -O BigPcap.tar.gz
tar xzvf BigPcap.tar.gz
The pcap is broken up into 15 smaller PCAP files. When you unzip the folder there is a bash script that you can run and it will read all of the PCAP files through zeek and suricata. Because the PCAP is big, the script will take awhile. The data is from 2012, so your logs will be in that time frame.
From the BigPcap directory, run:
sudo ./read-pcap.sh
The logs for the pcap you run will be dated for when the PCAP happened, not for when you read it in. For example: if you read in PCAP from 2017, the logs will be in 2017, even though it is 2023.
IMPORTANT: Before running pcap through zeek or suricata, you have to make sure you're in the correct directory so that filebeat can pull the logs as zeek and suricata store the logs in the current working directory when you use the -r option. You also have to give zeek the json-logs.zeek path so that zeek writes the logs as json for filebeat to send to elasticsearch (by default zeek stores its logs as tab delimited)
To generate logs for any pcap file you have on your system:
cd /opt/zeek/logs/
sudo /./opt/zeek/bin/zeek -r </path/to/pcap> /opt/zeek/share/zeek/policy/tuning/json-logs.zeek
cd /var/log/suricata/
sudo /./opt/suricata/bin/suricata -r </path/to/pcap>
If you have already run pcap and you wish to clear the data before running new pcap, simply clear the logs on the filesystem and then delete the documents from the index:
sudo rm -f /var/log/suricata/eve.json
sudo rm -f /opt/zeek/logs/*.log
curl --insecure -XGET "https://localhost:9200/_cat/indices?v&pretty" -u elastic:password
Now take the index name that is returned and run the following (this may take awhile depending on how many documents you have in your index):
curl --insecure -X POST "https://localhost:9200/your_index_name/_delete_by_query?conflicts=proceed&pretty" -H 'Content-Type: application/json' -u elastic:password -d'
{
"query": {
"match_all": {}
}
}
'
If you wish to change the passwords after you set them, you can do so with the elasticsearch-reset-password utility. Simply run sudo /usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic -i NOTE: If you update the default elastic password, you will also have to update it in the filebeat.yml at /etc/filebeat/filebeat.yml
If you want to capture on a promiscuous interface instead of reading PCAP:
Uncomment lines 4 and 5 in the /etc/zeek/node.cfg file and replace eth0 with your promiscuous interface.
Uncomment lines 520-527 in /etc/suricata/suricata.yaml and replace eth0 with your capture interface.
Add -i <your capture interface> to line 7 of /etc/systemd/system/suricata.service
You can now start zeek and suricata.
sudo systemctl daemon-reload
systemctl start suricata
/./opt/zeek/bin/zeekctl deploy
The best way to perform troubleshooting is to run journalctl -xeu <service> | less where <service> is the service you're troubleshooting. For example:
journalctl -xeu kibana.service | less
You can use SHIFT + G to jump to the most recent logs.
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