docs: Add article on Suricata

docs/user/software/networking/suricata.md

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+---
+title: Suricata
+summary: A quick start guide to using Suricata on Solus
+---
+
+# Suricata
+
+Suricata is a network Intrusion Detection System, Intrusion Prevention System, and Network Security Monitoring engine developed by the OISF and the Suricata community.
+
+## Installation
+
+To install Suricata on Solus, you must use `eopkg` from the command line.
+
+```bash
+sudo eopkg install suricata
+```
+
+## Configuration
+
+Suricata requires some configuration before it will run. As with most packages on Solus, Suricata is [stateless](/docs/user/software/configuration_files). The default configuration files are located in `/usr/share/defaults/suricata`.
+
+To begin configuring, first copy these files to `/etc/suricata`.
+
+```bash
+sudo cp -r /usr/share/defaults/suricata /etc/suricata
+```
+
+Give the Suricata system user permission to read files in this directory.
+
+```bash
+sudo chown -R suricata:suricata /etc/suricata
+```
+
+You will need to edit the `/etc/suricata/suricata.yaml` file to point to the other configuration files in `/etc/suricata`. The keys you are looking for are:
+
+- `classification-file`
+- `reference-config-file`
+- `threshold-file`
+
+Feel free to change any other configuration options while you have this file open.
+
+Next, you will need to create a file named `/etc/sysconfig/suricata` and set a variable called `OPTIONS`. This file will be used by systemd to add parameters to the command to start Suricata. Copy the following text, and modify the variables to suit your system.
+
+```ini
+# The following parameters are the most commonly needed to configure
+# suricata. A full list can be seen by running /usr/bin/suricata --help
+# -c <path to configuration file>
+# -i <network interface device>
+# --user <acct name>
+# --group <group name>
+# Add options to be passed to the daemon
+OPTIONS="-c /etc/suricata/suricata/yaml -i enp42s0 --user suricata "
+```
+
+### Adding rules
+
+Our package ships with minimal rules. For Suricata to do its job, it must have better rules. Rules can be obtained from a couple places. One place you can get rules from is the Emerging Threats website. For example:
+
+```bash
+wget http://rules.emergingthreats.net/open/suricata/emerging.rules.tar.gz
+sudo mkdir /etc/suricata/rules
+sudo tar -xz -C /etc/suricata/rules/ --strip-components=1 -f emerging.rules.tar.gz
+sudo chown -R suricata:suricata /etc/suricata/rules
+```
+
+Then, open `/etc/suricata/suricata.yaml` and search for a setting key named `rule-files`. Enable or disable individual rules as you see fit.
+
+## Starting and stopping Suricata
+
+:::warning
+Suricata does not start on boot by default. You need to either start it manually, or configure it to start automatically.
+:::
+
+```bash
+# Start Suricata manually
+systemctl start suricata.service
+
+# Configure Suricata to start automatically on each boot and immediately start the service
+systemctl enable --now suricata.service
+
+# Check whether Suricata is running
+systemctl status suricata.service
+
+# Restart Suricata manually
+systemctl restart suricata.service
+
+# Stop Suricata manually
+systemctl stop suricata.service
+
+# Configure Suricata to not start automatically on each boot and immediately stop the service
+systemctl disable --now suricata.service
+```