OpenVAS

Overview

The Open Vulnerability Assessment Scanner (OpenVAS) and Greenbone Security tools provide the following capabilities:

• Scan systems on your network looking for security risks.
• Manage and update the rule sets used for the scans.
• Produce reports based on the scans.
• Schedule periodic scans.
• Interact with the system via the command line, a desktop GUI interface, or a web based front end.

The OpenVAS project is a branch of the original Nessus software. More information can be found at http://www.openvas.com/.

The OpenVAS software package was included in the NST distribution starting with the 2.15.0 release.

Command Line Setup

This section outlines the general procedure for setting up OpenVAS on a NST v2.15.0 system using the command line.

Tweak the nobody Account

The 2.0.3 release of the openvas-manager package has a issue where the nobody account needs to have its shell set to /bin/bash. This requirement was supposedly fixed in the 2.0.4 release of the openvas-manager package. Hopefully, by the time NST 2.15.0 is released, it will include the 2.0.4 release of the openvas-manager package and you will be able to skip this step.

Use the following command to determine what version of the openvas-manager package is installed:

[root@dhcp132 ~]# rpm -q openvas-manager
openvas-manager-2.0.3-1.fc15.i686
[root@dhcp132 ~]# 

If you see version 2.0.3, then edit your /etc/passwd file and change the shell from /sbin/nobody to /bin/bash. Alternatively, you can run the following sed command (the two grep commands do not need to be run, they are included below to show the change):

[root@dhcp132 ~]# grep ^nobody /etc/passwd
nobody:x:99:99:Nobody:/:/sbin/nologin
[root@dhcp132 ~]# sed -i -e 's,^\(nobody.*\):/sbin/nologin,\1:/bin/bash,' /etc/passwd
[root@dhcp132 ~]# grep ^nobody /etc/passwdnobody:x:99:99:Nobody:/:/bin/bash
[root@dhcp132 ~]# 

Optionally Download/Update the OpenVAS Plugins

The plugins for OpenVAS can be found under the /var/lib/openvas/plugins directory. You may not want to try and list all of the files in this directory as there can be quite a few. The following command shows how to get a count of the currently available plugins:

[root@dhcp132 ~]# ls /var/lib/openvas/plugins/* | wc -l
42415
[root@dhcp132 ~]# 

To update (or install if you don't have any plugins currently available), use the openvas-nvt-sync command. For example:

[root@dhcp132 ~]# openvas-nvt-sync

... Lots of output as rules are updated ...

[root@dhcp132 ~]# 

WARNING: Due not try this on a Live boot of the NST, as it writes a large amount of data to disk (which consumes RAM in a live boot).

Start The openvas-scanner Service

Starting the openvas-scanner (openvassd) service takes a long time. This occurs due to the loading and processing of all of the rules. When the service is started, it reads through all of the ASCII plugins and creates cached versions under the /var/cache/openvas directory. The first time you try and start the service, systemctl may time out and report that the service failed to start even though the openvassd process is still running and parsing rules. For example:

[root@dhcp132 ~]# service openvas-scanner start
Starting openvas-scanner (via systemctl):  Job failed. See system logs and 'systemctl status' for details.
                                                           [FAILED]
[root@dhcp132 ~]# ps -fC openvassd
UID        PID  PPID  C STIME TTY          TIME CMD
root     24529     1  0 07:13 ?        00:00:00 openvassd -q --port=9391
[root@dhcp132 ~]# 

Eventually the openvassd process will complete it's loading phase and enter into a state where it is ready to accept incoming connections. You can use the ps command to check for this:

[root@dhcp132 ~]# ps -fC openvassd
UID        PID  PPID  C STIME TTY          TIME CMD
root     24529     1  0 07:13 ?        00:00:00 openvassd: waiting for incoming 
[root@dhcp132 ~]# 

The systemctl command can also be used to verify that the openvassd process is ready for incoming connections:

[root@dhcp132 ~]# systemctl status openvas-scanner.service
openvas-scanner.service - LSB: start|stop|status|restart|condrestart|reloadplugins OpenVAS Scanner
	  Loaded: loaded (/etc/rc.d/init.d/openvas-scanner)
	  Active: failed since Wed, 15 Jun 2011 07:10:23 -0400; 7min ago 
	 Process: 2164 ExecStart=/etc/rc.d/init.d/openvas-scanner start (code=killed, signal=TERM)
	  CGroup: name=systemd:/system/openvas-scanner.service
		  └ 24529 openvassd: waiting for incoming connections
[root@dhcp132 ~]#

You may notice that systemctl reports the service in a failed state even though the openvassd daemon is running and accepting connections. You should be able to clear this failed state indicator by restarting the service.

[root@dhcp132 ~]# service openvas-scanner restart
Restarting openvas-scanner (via systemctl):                [  OK  ]
[root@dhcp132 ~]# service openvas-scanner status
openvas-scanner.service - LSB: start|stop|status|restart|condrestart|reloadplugins OpenVAS Scanner 
	  Loaded: loaded (/etc/rc.d/init.d/openvas-scanner)
 	  Active: active (running) since Wed, 15 Jun 2011 07:48:51 -0400; 3s ago
	 Process: 23711 ExecStart=/etc/rc.d/init.d/openvas-scanner start (code=exited, status=0/SUCCESS)
	Main PID: 23659 (openvassd)
	  CGroup: name=systemd:/system/openvas-scanner.service
		  └ 23659 openvassd: waiting for incoming connections
[root@dhcp132 ~]#

Start The openvas-manager Service

Before starting the openvas-manager (openvasmd) service, you need to initialize (rebuild) it's database the first time you set up your system. Run the following command to rebuild the database:

[root@dhcp132 ~]# openvasmd --rebuild
[root@dhcp132 ~]# 

Once the database has been setup, you can start the service in the following manner:

[root@dhcp132 ~]# service openvas-manager start
Starting openvas-manager (via systemctl):                  [  OK  ]
[root@dhcp132 ~]# 

Start The openvas-administrator Service

Before starting the openvas-administrator (openvasad) service, you need to add a administrative user. The following demonstrates how to add a root user (you can choose any name you prefer):

[root@dhcp132 ~]# openvasad -c add_user -n root --role=Admin
Enter password: 
ad   main:MESSAGE:23822:2011-06-15 07h54.32 EDT: No rules file provided, the new user will have no restrictions.
ad   main:MESSAGE:23822:2011-06-15 07h54.32 EDT: User root has been successfully created.
[root@dhcp132 ~]# 

Once a administrative user has been added, you should be able to start the service as shown below

[root@dhcp132 ~]# service openvas-administrator start
Starting openvas-administrator:
                                                           [  OK  ]
[root@dhcp132 ~]# 

Start The gsad Service

Once the OpenVAS services are set up and running, you should be able to start the Greenbone Security Assistant service as follows:

[root@dhcp132 ~]# service gsad start
Starting greenbone-security-assistant: 
[root@dhcp132 ~]# 

Verify Your Setup Using openvas-check-setup

After you have all of the services set up and running, you can use the openvas-check-setup command to perform a sanity check on your system to verify that it has been setup correctly.

[root@dhcp132 ~]# openvas-check-setup

... Lots of output as various checks are performed.
    If not all OK, then a SUGGESTION should appear ...

It seems like your OpenVAS-4 installation is OK.
 
If you think it is not OK, please report your observation
and help us to improve this check routine:
http://lists.wald.intevation.org/mailman/listinfo/openvas-discuss
Please attach the log-file (/tmp/openvas-check-setup.log) to help us analyze the problem.

[root@dhcp132 ~]#