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# OSSEC Server

Wazuh alternative SIEM and Host Based IDS.

## Installation

**Docker compose configuration**

{% code overflow="wrap" lineNumbers="true" %}

```
services:
    ossec:
        container_name: ossec-server
        image: atomicorp/ossec-docker:v3.6
        ports:
            - 1514:1514/udp
            - 1515:1515/tcp
        volumes:
            - ossec-data:/var/ossec/data 
volumes:
    ossec-data:
```

{% endcode %}

{% hint style="info" %}
**Logs** and **Agent Key Data** are stored under `/var/ossec/data` in the container.
{% endhint %}

**Pull image and Create + Run container**

{% code overflow="wrap" lineNumbers="true" %}

```
sudo docker compose pull
sudo docker compose up -d
```

{% endcode %}

## Access

**Attach an interactive shell to the container**

{% code overflow="wrap" lineNumbers="true" %}

```
sudo docker exec -it ossec-server bash
```

{% endcode %}

## Adding an Agent

**Automated key addition approach**

Temporarily setup an authentication listener on the server

{% code overflow="wrap" lineNumbers="true" %}

```
sudo docker exec ossec-server /var/ossec/bin/ossec-authd -p 1515 -n
```

{% endcode %}

{% hint style="info" %}
The **-n** option disables password authentication, not recommended in general (since key sharing becomes insecure), but quick setup for the purpose of this lab. An alternative yet tedious approach, **"Managing Agents",** is referenced below.
{% endhint %}

Have the agent connect to the server to receive and install an agent-key using `agent-auth`. Then restart **OSSEC** processes (if its the first agent)

{% code overflow="wrap" lineNumbers="true" %}

```
/var/ossec/bin/ossec-control restart
```

{% endcode %}

**Confirm that the agent is communicating**

Insure you have edited the `/var/ossec/etc/ossec.conf` on the agent to point to the correct `server-ip`.

{% code overflow="wrap" lineNumbers="true" %}

```
/var/ossec/bin/agent_control -lc
```

{% endcode %}

**Kill the key distribution daemon**

{% code overflow="wrap" lineNumbers="true" %}

```
ps -ef | grep ossec-authd
kill 299 # PID=299
```

{% endcode %}

{% embed url="<https://hub.docker.com/r/atomicorp/ossec-docker/>" %}

{% embed url="<https://www.ossec.net/docs/>" %}

{% embed url="<https://www.ossec.net/docs/docs/manual/agent/agent-management.html>" %}

{% embed url="<https://www.ossec.net/docs/docs/manual/agent/agent-auth.html>" %}


---

# Agent Instructions
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