ns8-nethsecurity-controller

Setup and start an instance of nethsecurity-controller.

Each node can host multiple controller instances.

The module is composed by the following containers:

• nethsecurity-api: REST API python server to manage nethsec-vpn clients
• nethsecurity-vpn: OpenVPN server, it authenticates the machines and create routes for the proxy
• nethsecurity-ui: lighttpd instance serving static UI files
• nethsecurity-proxy: traefik forwards requests to the connected machines using the machine name as path prefix
• promtail: log collector for Loki, it listens for syslog messages on the VPN address and forwards them to Loki
• prometheus: metrics collector, it scrapes metrics from the connected machines
• loki: log storage, it stores logs from promtail
• grafana: metrics visualization, it visualizes metrics from prometheus and logs from loki
• webssh: web-based ssh client

Install

Instantiate the module with:

add-module ghcr.io/nethserver/nethsecurity-controller:latest

The output of the command will return the instance name. Output example:

{"module_id": "nethsecurity-controller1", "image_name": "nethsecurity-controller", "image_url": "ghcr.io/nethserver/nethsecurity-controller:latest"}

Configure

You can configure the controller directly from the UI or use the command line.

Let's assume that the nethsecurity-controller instance is named nethsecurity-controller1.

Launch configure-module, by setting the following parameters:

• host: a fully qualified domain name for the controller
• lets_encrypt: enable or disable Let's Encrypt certificate
• ovpn_network: OpenVPN network
• ovpn_netmask: OpenVPN netmasj
• ovpn_cn: OpenVPN Certificate CN
• api_user: controller admin user
• api_password: controller admin password, change it after first login
• loki_retention: Loki retention period in days (default: 180 days)
• promtail_retention: Promtail retention period in days (default: 15 days)

Example:

api-cli run  module/nethsecurity-controller1/configure-module --data '{"host": "mycontroller.nethsecurity.org", "lets_encrypt": false, "ovpn_network": "172.19.64.0", "ovpn_netmask": "255.255.255.0", "ovpn_cn": "nethsec", "api_user": "admin", "api_password": "password", "loki_retention": 180, "prometheus_retention": 15}'

The above command will:

• start and configure the nethsecurity-controller instance
• setup a the following routes inside traefik:
  • one route to reach the controller based on the host parameter like https://mycontroller.nethsecurity.org/
  • one route to reach the prometheus, with a random generated URL like https://myontroller.nethsecurity.org/f0365996-c1b3-4252-9cf3-c2e7e86ed617/
  • one route to reach the loki, with a random generated URL like https://mycontroller.nethsecurity.org/3e3e3e3e-3e3e-3e3e-3e3e-3e3e3e3e3e3e/
  • one route to reach the grafana, with a well-know URL like https://mycontroller.nethsecurity.org/grafana/
• setup Promtail syslog receiver
• setup Prometheus for metrics scraping
• setup Loki for receiving logs
• setup Grafana for metrics visualization

Once the controller is configured, you access the controller URL, eg. mycontroller.nethsecurity.org, and manage NethSecurity units.

Module overview

The module is composed by the following systemd units:

• controller.service: runs the container pod, all containers are part of the same pod; it can start and stop all the containers at once
• api.service: runs the nethsecurity-api container
• vpn.service: runs the nethsecurity-vpn container
• ui.service: runs the nethsecurity-ui container
• proxy.service: runs the nethsecurity-proxy container
• promtail.service: runs the promtail container
• prometheus.service: runs the prometheus container
• loki.service: runs the loki container
• grafana.service: runs the grafana container
• metrics-exporter.path: watch for vpn connections from vpn.service and start metrics-exporter.service; each time a new client connects, the vpn container creates a file inside the prometheus.d/ directory
• metrics-exporter.service: executes the metrics_exporter_handler script to create a new prometheus target for the connected machine
• webssh.service: runs the webssh container

API Server

The api server gives NethSecurity the ability to register itself to NS8 (through ns-plug) and gives access to the on-demand generated credentials for the VPN.

The API also registers the endpoints for the Traefik Proxy that allows direct interaction with the firewall, even if it's not in the same network.

VPN

The OpenVPN container tunnels connection from the NethSecurity to the NS8 through a VPN tunnel, due to firewall configuration in NS8, no client can be reached from other clients and only client-server communication is allowed.

The module uses the NS8 TUN feature to create a new network interface and assign it to the VPN container.

Proxy and UI

The UI allows the browse of the interface directly off the NethSecurity installation, this is possible due to the Traefik Proxy server that redirects the urls to the correct IP inside the VPN.

Promtail

Promtail is a log collector for Loki, it listens for syslog messages on the VPN address and forwards them to Loki. The configuration is available at /home/nethsecurity-controller1/.config/etc/promtail.yml. Promtail sets the following labels:

• job fixed to syslog
• unit hostname
• log level
• application name
• syslog facility name
• controller_name the name of the controller as configured in ovpn_cn

Prometheus

Prometheus is a metrics collector, it scrapes metrics from the connected machines. The configuration is available at /home/nethsecurity-controller1/.config/state/prometheus.yml and it's generated every time by the configure-module action. It has a the following targets:

• static target with job_name loki that scrapes Loki metrics
• dynamic targets with job_name node that scrapes metrics from the connected machines from the prometheus.d/ directory under the state directory (eg. /home/nethsecurity-controller1/.config/state/prometheus.d)

Each dynamic target is created by the metrics-exporter and has the following labels:

• instance the VPN IP of the connected machine with the netdata port (eg. 172.19.64.3:19999)
• job fixed to node
• node the VPN IP of the connected machine
• unit the unit unique name of the connected machine

Access to Prometheus web interface is protected using a random generated URL, you can find it inside the module configuration file at /home/nethsecurity-controller1/.config/state/config.json.

Loki

Loki is a log storage, it stores logs from promtail. The configuration is available at /home/nethsecurity-controller1/.config/etc/loki.yml.

It uses TSDB as storage and it's configured to store logs for loki_retention days.

You can use logcli to query the logs. First, access the module with runagent and source the environment file loki.env to set the LOKI_ADDR variable:

runagent -m nethsecurity-controller1 /bin/bash
. loki.env

List labels:

LOKI_ADDR=http://127.0.0.1:${LOKI_HTTP_PORT} logcli labels

You can do the same with curl: curl -v http://127.0.0.1:${LOKI_HTTP_PORT}/loki/api/v1/labels

Query logs:

LOKI_ADDR=http://127.0.0.1:${LOKI_HTTP_PORT} logcli series --analyze-labels '{hostname="NethSec"}'
LOKI_ADDR=http://127.0.0.1:${LOKI_HTTP_PORT} logcli query  '{hostname="NethSec"}'

Access to Loki web interface is protected using a random generated URL, you can find it inside the module configuration file at /home/nethsecurity-controller1/.config/state/config.json.

Grafana

Grafana is a metrics visualization, it visualizes metrics from prometheus and logs from loki. It's configured via environment variables and the configuration is available at /home/nethsecurity-controller1/.config/state/grafana.env, it also has a static configuration file at /home/nethsecurity-controller1/.config/grafana.yml.

The modules has already two pre-configured datasources: Loki and Prometheus containers. It has also some pre-configured dashboards:

• nethsecurity.json: a dashboard with the most important metrics from the connected machines, like CPU, memory, disk, network, and system load
• logs.json: a dashboard where you can visualize the logs from all the connected machines and filter them by hostname, application, and priority
• loki.json: a dashboard with the most important metrics from Loki, like the number of logs ingested, the number of logs dropped, and the status of queriers

Grafana is accessible at https://<controller-host>/grafana/, default credentials are the same set for the controller. You should change them on the first login.

WebSSH

WebSSH is a web-based ssh client. It's configured using parameters in the webssh.service unit.

Access to WebSSH is protected using a random generated URL, you can find it inside the module configuration file at /home/nethsecurity-controller1/.config/state/config.json.

Uninstall

To uninstall the instance:

remove-module --no-preserve nethsecurity-controller1