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# OpenVAS

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OpenVAS stands for Open Vulnerability Assessment System and is a network security scanner with associated tools like a graphical user front-end. The core component is a server with a set of network vulnerability tests (NVTs) to detect security problems in remote systems and applications.

## Pre-install

### PostgreSQL

Set up PostgreSQL before you continue.

### Redis

Configure Redis as prescribed by the OpenVAS redis configuration. In summary, amend the following to your `/etc/redis/redis.conf`:

    port 0
    unixsocket /run/redis/redis.sock
    unixsocketperm 770
    timeout 0
    databases 128

Note See the previous `OpenVAS redis configuration` document on how to calculate the `databases` number.

Finally restart `redis.service`.

## Installation

Install the following packages to get a full OpenVAS setup, including manager, web frontend, scanner, and so on: openvas-scannerAUR, ospd-openvasAUR, gsaAUR, gvmdAUR. nmap needs to be installed for the scanner to deliver proper results and texlive is needed for PDF report feature to work.

Warning The packages openvas-scannerAUR, ospd-openvasAUR, gsaAUR, gvmdAUR are currently broken. To fix them refer to [1].

## Initial setup

Setup the PostgreSQL DB for gvm:

    [postgres]$ createuser gvm
    [postgres]$ createdb -O gvm gvmd

Grant this user DBA roles:

    [postgres]$ psql gvmd
    # create role dba with superuser noinherit;
    # grant dba to gvm;
    # create extension "uuid-ossp";
    # \q

Make sure to have the following sysctl configurations:

    # echo "net.core.somaxconn = 1024" >> /etc/sysctl.d/90-openvas.conf
    # echo "vm.overcommit_memory = 1" >> /etc/sysctl.d/90-openvas.conf
    # sysctl -p /etc/sysctl.d/90-openvas.conf

Before doing this check the values of somaxconn (normally this is 4096 for Arch Linux and does not need to be adjusted:

    # sysctl -a | grep somaxconn

If this is the case just skip the first echo line.

Grant the gvm user access to the redis socket:

    # usermod -aG redis gvm
    # echo "db_address = /run/redis/redis.sock" > /etc/openvas/openvas.conf
    # chown gvm:gvm /etc/openvas/openvas.conf

Update NVTs:

    # chown -R gvm:gvm /var/lib/openvas
    [gvm]$ greenbone-nvt-sync && openvas --update-vt-info

Update feeds:

    [gvm]$ greenbone-feed-sync --type GVMD_DATA
    [gvm]$ greenbone-scapdata-sync --rsync
    [gvm]$ greenbone-certdata-sync --rsync

You can enable the following timers to update these data on a frequently basis: `greenbone-nvt-sync.timer`, `greenbone-feed-sync.timer`, `greenbone-scapdata-sync.timer`, `greenbone-certdata-sync.timer`.

Create certificates for the server and clients, default values were used:

    [gvm]$ gvm-manage-certs -a

Add an administrator user account, be sure to copy the password:

    [gvm]$ gvmd --create-user=admin --role=Admin

You can also change the password of the user later on

    [gvm]$ gvmd --user=admin --new-password=<password>

## Getting started

Start `ospd-openvas.service`, `gvmd.service` and `gsad.service`.

Create the Scanner:

    [gvm]$ gvmd --get-scanners

Copy the id of the OpenVAS Default scanner and run:

    [gvm]$ gvmd --modify-scanner=id-of-scanner --scanner-host=/run/gvm/ospd.sock
    [gvm]$ gvmd --verify-scanner=id-of-scanner

Set the feed import user:

    [gvm]$ gvmd --get-users --verbose

Copy the id of the admin user and run:

    [gvm]$ gvmd --modify-setting 78eceaec-3385-11ea-b237-28d24461215b --value id-of-admin

Point your web browser to http://127.0.0.1 and login with your admin credentials.

Note By default, `gsad` will bind to port 80. If you are already running a webserver, this will obviously cause problems. You can modify the ports and listen addresses in the file /etc/default/gsad

## See also

- Wikipedia:OpenVAS
- OpenVAS Official OpenVAS website.

Categories:

- Networking
- Security testing

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