Setting up A Network Monitoring and Inventory System

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This material is work-in-progress ...

This page started out as a fun project, but then it wasn't fully completed due to time constraints. Following it will result in having a server that can run a ping sweep of a given subnet, submit the results of the sweep to OpenAudit so that the Windows machines will be audited automatically, then parse the results and add found computers to different Nagios hostgroups in NagioSQL based on certain software that they have installed, such as Microsoft Exchange or Lotus Domino. Unfortunately, the final code for OpenAudit + Nagios integration, the part that exports the data from the NagioSQL database to the nagios config files then issues a SIGHUP to Nagios so the changes take effect, hasn't been implemented yet. Once it has been, this page will be updated.
(Last edited by Dubiousjim on 24 Mar 2012.)

Contents

Goal

Basic concept is to combine the above apps/utilities to create an easy to set up and low upkeep monitoring system that also tracks inventory thanks to OpenAudit. Redundant entries in configs will be kept to a minimum (hopefully). New devices should be auto-added to monitoring systems, along with associated services (for example, a Windows server running MS Exchange might have basic services such as CPU load, HD free space, running services and Exchange queues monitored, whereas a router running on Alpine Linux would might need the routing table, throughput, and opennhrp monitored). Also, software licensing should be monitored so that Windows boxes do not exceed purchased licenses.

Once finished, the scripts to tie OpenAudit and the monitoring components will be called AMAAPS (Automatic Monitoring And Auditing Populating System) (WIP available at http://github.com/jbilyk/AMAAPS)

To accomplish the above, this guide will set up (list subject to change):

  • Lighttpd
  • Nagios
  • NagiosQL
  • Cacti
  • Smokeping
  • OpenAudit
  • MySQL DB and associated scripts to tie these together

This guide will assume:

  • You have a knowledge of your network setup (at least know which subnets exist)
  • Your network allows ICMP ping packets to every device that you want discovered and automatically added to the system
  • Your firewalls (whether on your networking devices or end-user devices) allow traffic back to the server that is being set up, and if it is a Windows host, allows RPC calls in especially if running the audits on Win7 Pro machines, double-check local firewall settings for traffic to/from OpenAudit computer (will allow audits to happen properly when triggered via the OpenAudit computer).
  • If you are auditing a Windows domain, you have access to an account that has local administrator privileges on every computer (on Win XP a user with Power User privileges may be enough).

Steps

Install lighttpd

Install the additional packages:

apk add lighttpd php-common php-iconv php-json php-gd php-curl php-xml php-pgsql php-imap php-cgi fcgi

apk add php-pdo php-pdo_pgsql php-soap php-xmlrpc php-posix php-mcrypt php-gettext php-ldap php-ctype php-dom

Configure Lighttpd

vi /etc/lighttpd/lighttpd.conf

Uncomment line:

include "mod_fastcgi.conf"

Start lighttpd service and add to needed runlevel

rc-service lighttpd start && rc-update add lighttpd default

Configure MySQL

/usr/bin/mysql_install_db --user=mysql /etc/init.d/mysql start && rc-update add mysql default /usr/bin/mysqladmin -u root password 'password'

Install Nagios, nagios-plugins and Nagiosql and other needed packages

apk add nagios nagios-web nagios-plugins nagiosql php-mysqli php-mysql

Create soft-link for nagiosql virtual host'

ln -s /usr/share/webapps/nagiosql /var/www/localhost/htdocs/nagiosql

Change permissions for nagiosql

chown lighttpd:lighttpd /usr/share/webapps/nagiosql/config

Browse to http://localhost/nagiosql and follow the setup instructions. Create folder /usr/share/webapps/openaudit and link to virtual host folder

mkdir /usr/share/webapps/openaudit chown lighttpd:lighttpd /usr/share/webapps/openaudit ln -s /usr/share/webapps/openaudit /var/www/localhost/htdocs/openaudit</nowiki>

Download openaudit from http://downloads.sourceforge.net/open-audit/openauditrelease-09.12.23-SVN1233.zip and extract to /usr/share/webapps/openaudit.

On a Windows server, create scheduled tasks to run ping-sweep-main.bat, lookup-main.bat and insert-hosts-main.bat on a regular basis. Since the insert-hosts-main.bat file runs RPC calls against other Windows servers, at the moment this section needs to run on a Windows server...

To be continued...

AMAAPS now has code to add Windows hosts that were found using OpenAudit into NagioSQL host table. Also will now add Exchange servers, SQL servers, and Lotus Domino servers to the proper hostgroups.

NOW: Finish NagioSQL config so that it has:

  • semi-sensible defaults (hostgroup setup, check commands, etc) and
  • a triggered reload of Nagios config when it's changed

Notes

SNMPTT receives snmp traps properly and sends them on to Nagios but they aren't parsed in any way yet.

Got nmap results into OpenAudit. Needed a change in admin_nmap_input.php line 48 ("Interesting ports on" -> "Nmap scan report for"), for which a bug report was filed upstream.

Got pingable/resolvable hosts automatically added into OpenAudit:

  • When auto-adding using scripts below, Windows versions 2000 (Pro and Server), XP Pro, 2003 (inc R2)(Std/Ent)(x86/x64) were detected. Windows 7 Pro only detected when the local firewall was set to allow RPC traffic through
  • Some printers (HP LJ3300, LJ8100) were detected whereas other models weren't
  • No networking devices (switches/routers) were added
  1. Schedule a query of Windows Servers from OpenAudit + installed software
  2. Check that nagiosql has each server in it
  3. If it doesn't, add host monitoring + base services
  4. For each MS software (such as Exchange, SQL, DPM), add services
  5. Query core switch via LLDP to find out where devices are and set up dependencies automatically
  6. SNMPTT integration to Nagios (setup based on device info in OpenAudit) - follow http://xavier.dusart.free.fr/joomla/index.php/en/nagios/47-traps-snmp-dans-nagios

Random scripts

Since part of implementation runs on Windows (due to running a VBScript from OpenAudit to collect Windows server/workstation info via RPC), a set of scripts that run on Windows are listed below.

Ping-sweep*.bat: does an nmap ping sweep of each subnet in subnet.txt and writes all hosts that are up to a file lookup*.bat: does a A record DNS lookup for each host that's pingable and writes results to a file insert-hosts*: for each resolvable host, downloads the vbscript to insert the host information into openaudit (uses WMI to get hardware, OS and software info)

ping-sweep-main.bat

cd C:\Program Files\WAMP\www\openaudit\scripts\scans
for /F %%i in (subnets.txt) do ping-sweep-backend.bat %%i

ping-sweep-backend.bat

@echo off
cd C:\Program Files\WAMP\www\openaudit\scripts\scans
del %1.ip.txt
nmap -sP %1 | "C:\program files\utilities\bin\grep" "Nmap scan report for" | "C:\Program Files\Utilities\bin\awk" -F " " "{print $NF}" | "C:\Program Files\Utilities\bin\awk" -F "(" "{print $NF}" | "C:\Program Files\Utilities\bin\awk" -F ")" "{print $1}" >> %1.ip.txt

lookup-main.bat

cd C:\Program Files\WAMP\www\openaudit\scripts\scans
for /F %%i in (subnets.txt) do lookup-subnet.bat %%i

lookup-subnet.bat

@echo off
cd C:\Program Files\WAMP\www\openaudit\scripts\scans
del %1.host.txt
for /F %%i in (%1.ip.txt) do @lookup-backend.bat %%i >> %1.host.txt

lookup-backend.bat

@nslookup %1 | "C:\program files\utilities\bin\grep" "Name:  " | "C:\program files\utilities\bin\awk" -F " " "{print $2}"

insert-hosts-main.bat

@echo off
cd C:\Program Files\WAMP\www\openaudit\scripts\scans
for /F %%i in (subnets.txt) do insert-hosts-subnet.bat %%i

insert-hosts-subnet.bat

@echo off
cd C:\Program Files\WAMP\www\openaudit\scripts\scans
for /F %%i in (%1.host.txt) do @insert-hosts-parse.bat %%i

insert-hosts-parse.bat

@echo off
cd C:\Program Files\WAMP\www\openaudit\scripts\scans
echo %1 | "C:\Program Files\Utilities\bin\awk.exe" -F "." "{print $1}" > temp-out-insert.txt
for /F %%A in (temp-out-insert.txt) do @insert-hosts-backend.bat %%A
del temp-out-insert.txt

insert-hosts-backend.bat

cd C:\Program Files\WAMP\www\openaudit\scripts\scans
"C:\Program Files\Utilities\bin\wget.exe" "http://camgmt01/openaudit/launch_local_audit.php?domain=example.org&application=cmd&ext=vbs&hostname=%1&" -O %1.vbs
cscript %1.vbs
del %1.vbs

subnet.txt (snippet)

10.14.8.0-255
10.14.9.0-255

To grab all Windows servers using MySQL:

select system_uuid,system_name,net_ip_address,system_os_name from openaudit.system where system_os_name like '%Microsoft%Server%';

exchangeservers hostgroup:
select distinct tbl_host.host_name,tbl_host.address from tbl_host,tbl_lnkHostgroupToHost,tbl_hostgroup where tbl_hostgroup.hostgroup_name = 'exchangeservers' and tbl_lnkHostgroupToHost.idMaster = tbl_hostgroup.id and tbl_lnkHostgroupToHost.idSlave = tbl_host.id;
sqlservers hostgroup:
select distinct tbl_host.host_name,tbl_host.address from tbl_host,tbl_lnkHostgroupToHost,tbl_hostgroup where tbl_hostgroup.hostgroup_name = 'sqlservers' and tbl_lnkHostgroupToHost.idMaster = tbl_hostgroup.id and tbl_lnkHostgroupToHost.idSlave = tbl_host.id;
lotusnotesservers hostgroup:
select distinct tbl_host.host_name,tbl_host.address from tbl_host,tbl_lnkHostgroupToHost,tbl_hostgroup where tbl_hostgroup.hostgroup_name = 'lotusnotesservers' and tbl_lnkHostgroupToHost.idMaster = tbl_hostgroup.id and tbl_lnkHostgroupToHost.idSlave = tbl_host.id;
windowsservers hostgroup:
select distinct tbl_host.host_name,tbl_host.address from tbl_host,tbl_lnkHostgroupToHost,tbl_hostgroup where tbl_hostgroup.hostgroup_name = 'windowsservers' and tbl_lnkHostgroupToHost.idMaster = tbl_hostgroup.id and tbl_lnkHostgroupToHost.idSlave = tbl_host.id;

OpenAudit queries:
Exchange:
select distinct system.system_name,system.net_ip_address from system,software where software_name like '%icrosoft%xchange' and software.software_uuid = system.system_uuid;
SQL:
select distinct system.system_name,system.net_ip_address from system,software where software.software_name like '%icrosoft%SQL%erver%200%' and system.system_os_name like '%erver%' and software.software_uuid = system.system_uuid;
Lotus Domino:
select distinct system.system_name,system.net_ip_address from system,software where software_name like '%otus%omino%' and software.software_uuid = system.system_uuid;
Windows:
select distinct system.system_name,system.net_ip_address from system where system.system_os_name like '%microsoft%server%';