In this tutorial, we will show you how to install Suricata on AlmaLinux 8. For those of you who didn’t know, Suricata is a free and open-source, mature, fast, and robust network threat detection engine. It can function as intrusion detection (IDS) engine, inline intrusion prevention system (IPS), network security monitoring (NSM) as well as an offline pcap processing tool. Suricata inspects the network traffic using powerful and extensive rules and signature language and has powerful Lua scripting support for the detection of complex threats.
This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘
sudo‘ to the commands to get root privileges. I will show you through the step-by-step installation of the Suricata on an AlmaLinux 8. You can follow the same instructions for Rocky Linux.
Install Suricata on AlmaLinux 8
Step 1. First, let’s start by ensuring your system is up-to-date.
sudo dnf update sudo dnf install epel-release sudo dnf config-manager --set-enabled PowerTools sudo dnf install diffutils gcc jansson-devel make nss-devel pcre-devel python3 python3-pyyaml rust-toolset zlib-devel curl wget tar lua lz4-devel
Step 2. Installing Suricata on AlmaLinux 8.
Now we download the latest stable release Suricata source code from the official page:
wget https://www.openinfosecfoundation.org/download/suricata-6.0.3.tar.gz tar xzf suricata-6.0.3.tar.gz
Then, compile and install Suricata using the following command below:
cd suricata-6.0.3 ./configure --sysconfdir=/etc --localstatedir=/var --prefix=/usr/ --enable-lua --enable-geopip make make install-full
Verify Suricata installation:
Step 3. Configure Suricata.
Once installed, The configuration file is located at
/etc/suricata/suricata.yaml. However, for our basic setup, we will only focus on the network interface on which Suricata is listening and the IP address attached to that interface:
Add the following lines:
vars: # more specific is better for alert accuracy and performance address-groups: #HOME_NET: "[192.168.0.0/16,10.0.0.0/8,172.16.0.0/12]" HOME_NET: "[192.168.77.21]" #HOME_NET: "[192.168.0.0/16]" #HOME_NET: "[10.0.0.0/8]" #HOME_NET: "[172.16.0.0/12]" #HOME_NET: "any" EXTERNAL_NET: "!$HOME_NET" #EXTERNAL_NET: "any" ...
Next, set the interface name at
# Linux high speed capture support af-packet: - interface: enp0s3 ...........
Define the Suricata rules files to use. We are using the default ET rules in this demo:
... default-rule-path: /var/lib/suricata/rules rule-files: - suricata.rules ...
After that, disable Suricata packet offloading by disabling interface Large Receive Offload (LRO)/Generic Receive Offload (GRO):
sudo ethtool -K <interface> gro off lro off
tx-checksum-ip-generic: ongeneric-segmentation-offload: ongeneric-receive-offload: offlarge-receive-offload: off [fixed]
If enabled, disable by running the command below:
ethtool -K <interface> gro off lro off
Step 4. Running Suricata.
Suricata can be managed by a
systemd service. But before initializing it, first, specify the interface on which Suricata is listening as below:
Add the following lines:
# Add options to be passed to the daemon #OPTIONS="-i eth0 --user suricata " OPTIONS="-i enp0s3 --user suricata "
Save and exit the file also, start and enable Suricata to run on boot:
sudo systemctl enable --now suricata
To check if Suricata is running check the Suricata log:
sudo tail /var/log/suricata/suricata.log
Step 5. Testing Suricata Rules.
In this demo, we are using the default ET Suricata rules. If you have created your own custom rules, be sure to test the Suricata rules for syntax errors:
sudo suricata -c /etc/suricata/suricata.yaml -T -v
26/7/2021 -- 16:46:11 - - Running suricata under test mode 26/7/2021 -- 16:46:11 - - This is Suricata version 5.0.3 RELEASE running in SYSTEM mode 26/7/2021 -- 16:46:11 - - CPUs/cores online: 1 26/7/2021 -- 16:46:11 - - fast output device (regular) initialized: fast.log 26/7/2021 -- 16:46:11 - - eve-log output device (regular) initialized: eve.json 26/7/2021 -- 16:46:11 - - stats output device (regular) initialized: stats.log 26/7/2021 -- 16:46:13 - - 1 rule files processed. 20676 rules successfully loaded, 0 rules failed 26/7/2021 -- 16:46:13 - - Threshold config parsed: 0 rule(s) found 26/7/2021 -- 16:46:13 - - 20679 signatures processed. 1138 are IP-only rules, 3987 are inspecting packet payload, 15324 inspect application layer, 103 are decoder event only26/7/2021 -- 16:46:28 - - Configuration provided was successfully loaded. Exiting.26/7/2021 -- 16:46:28 - - cleaning up signature grouping structure… complete
Congratulations! You have successfully installed Suricata. Thanks for using this tutorial for installing Suricata on your AlmaLinux 8 system. For additional help or useful information, we recommend you check the official Suricata website.