Latest revision as of 12:28, 10 August 2014

Requirements

Database server (MySQL). See MySQL server

Sources

Ubuntu-FR Snort: http://doc.ubuntu-fr.org/snort
Ubuntu-FR Snort-inline [IPS]: http://doc.ubuntu-fr.org/snort_inline

SNORT installation

Requirements

You need to add a new MySQL database and user for snort.

hint: you can use PHPMyAdmin or MySQL workbench to do so!

Installation

Packages

apt-get install snort snort-doc snort-rules-default snort-common snort-common-libraries oinkmaster
apt-get install libcrypt-ssleay-perl liblwp-protocol-https-perl

During the installation you will be ask for the $HOME_NET.

If plan to protect a network, use the Network IP@/Submask
For a single computer put IP@/32. Do that for servers that are hosted somewhere on the cloud (OVH, TripNet, ...).

Basic configuration

Interactive way

dpkg-reconfigure snort

Boot
Interface: eth0
set the IP@ of your server
Do NOT enable promiscuous mode
No custom options
(optional) daily reports by email

Manual way

Set attributes:

vim /etc/snort/snort.debian.conf

!! Note that settings are set in Debian configuration, the .conf is SNORT global configuration !!

DEBIAN_SNORT_HOME_NET="IP@/submask"

Know your version of snort

snort -V

you should see something like that:

   ,,_     -*> Snort! <*-
  o"  )~   Version 2.9.6.0 GRE (Build 47)
   ''''    By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team
           Copyright (C) 2014 Cisco and/or its affiliates. All rights reserved.
           Copyright (C) 1998-2013 Sourcefire, Inc., et al.
           Using libpcap version 1.5.3
           Using PCRE version: 8.31 2012-07-06
           Using ZLIB version: 1.2.8

Configure rules and update

SNORT account

Get a SNORT account: https://www.snort.org

Each SNORT account has an OINKCODE, that is required to get the updates.

Oinkmaster

Oinkmaster is THE reference tool to get the rules updates. However, that's a pain to configure. :'(

Instead of that, the community as created Pulled Pork: that's a script that does the configuration for you.

Pulled Pork

Preparation

PulledPork required specifics files & folders:

mkdir -p /etc/snort/rules/iplists
touch /etc/snort/rules/iplists/default.blacklist
chmod 777 /etc/snort/rules/iplists/default.blacklist

Get Pulled Pork

Get the latest version of Pulled Pork: https://code.google.com/p/pulledpork/downloads/list

cd /tmp && wget https://pulledpork.googlecode.com/files/pulledpork-0.7.0.tar.gz

Installation

Unzip the archive and open it

tar xvf pulledpork-0.7.0.tar.gz
cd pulledpork-0.7.0

Copy configuration files to the /etc/snort + start script (pulledpork.pl) to the /usr/local/bin/ directory.

cp pulledpork.pl /usr/local/bin/pulledpork.pl
chmod 755 /usr/local/bin/pulledpork.pl
cp etc/* /etc/snort/

Configuration

Edit PulledPork configuration

vim /etc/snort/pulledpork.conf

Set / adjust the following settings:

## Set your OinkCode
## Lines 19,21,24,26 replace <oinkcode> by your own.
rule_url=https://www.snort.org/reg-rules/|snortrules-snapshot.tar.gz|<oinkcode>
rule_url=https://s3.amazonaws.com/snort-org/www/rules/community/|community-rules.tar.gz|Community
rule_url=http://labs.snort.org/feeds/ip-filter.blf|IPBLACKLIST|open
rule_url=https://www.snort.org/reg-rules/|opensource.gz|<oinkcode>

## Line 72 (default = /usr/local/etc/snort/rules/snort.rules)
rule_path=/etc/snort/rules/snort.rules

## Line 87 (default = /usr/local/etc/snort/rules/local.rules)
local_rules=/etc/snort/rules/local.rules

## Line 90 (default = /usr/local/etc/snort/sid-msg.map)
sid_msg=/etc/snort/sid-msg.map

## Line 110 (default = /usr/local/lib/snort_dynamicrules/)
sorule_path=/usr/lib/snort_dynamicrules/

## Line 113 (default = /usr/local/bin/snort)
snort_path=/usr/sbin/snort

## Line 117 (default = /usr/local/etc/snort/snort.conf)
config_path=/etc/snort/snort.conf

## Line 120 uncomment and adjust (default = /usr/local/etc/snort/rules/so_rules.rules) 
sostub_path=/etc/snort/rules/so_rules.rules

## Line 131
distro=Ubuntu-14.04

## Line 139 (default = /usr/local/etc/snort/rules/iplists/default.blacklist)
black_list=/etc/snort/rules/iplists/default.blacklist

## Line 148 (default = /usr/local/etc/snort/rules/iplists)
IPRVersion=/etc/snort/rules/iplists

## Line 190 uncomment the snort_version line
######
# Put your right version like 2.9.6.0
# You can check what are the available versions on https://www.snort.org/downloads/#rule-
# Usually there is no 2.9.6.0 but 2.9.6.1, 2.9.6.2,... instead
###
snort_version=2.9.6.1

Get rules

Execute Pulled Pork

pulledpork.pl -c /etc/snort/pulledpork.conf

You should see something like:

    http://code.google.com/p/pulledpork/
      _____ ____
     `----,\    )
      `--==\\  /    PulledPork v0.7.0 - Swine Flu!
       `--==\\/
     .-~~~~-.Y|\\_  Copyright (C) 2009-2013 JJ Cummings
  @_/        /  66\_  cummingsj@gmail.com
    |    \   \   _(")
     \   /-| ||'--'  Rules give me wings!
      \_\  \_\\
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

...

Fly Piggy Fly!

Test snort

You can check that SNORT is working with your rules by launching it. See #Run SNORT

Get rules periodically

The best way to get rules periodically is to setup a cronjob.

Create an entry in crontab to automate the process of keeping the Snort rules up to date.

Edit crontab

crontab -e

Add

0 2 * * * pulledpork.pl -c /etc/snort/pulledpork.conf -H -v >> /var/log/pulledpork 2>&1 #Update Snort Rules

Run SNORT

This is how you can start SNORT manually:

snort -c /etc/snort/snort.conf

if OK you should see:

...

4150 Snort rules read
    3476 detection rules
    0 decoder rules
    0 preprocessor rules
3476 Option Chains linked into 271 Chain Headers
0 Dynamic rules
+++++++++++++++++++++++++++++++++++++++++++++++++++

...

        --== Initialization Complete ==--

'Ctrl + C' to exit.

If there's some errors, then you can check the /var/log/syslog

.. You might have to comment some rules, depending on your configuration...

Managing rules

All the rules are not enable by default. According to your own policy, you might want to enable / disable some specifics rules.

Have a look to your configuration file

vim /etc/snort/snort.conf

Cf STEP 7 (~ line 555).

Don't forget to restart SNORT !

service snort restart

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Latest revision as of 12:28, 10 August 2014

Contents

Requirements

Sources

SNORT installation

Requirements

Installation

Packages

Basic configuration

Know your version of snort

Configure rules and update

SNORT account

Oinkmaster

Pulled Pork

Preparation

Get Pulled Pork

Installation

Configuration

Get rules

Test snort

Get rules periodically

Run SNORT

Managing rules

@@ Line 31: / Line 31: @@
 <syntaxhighlight lang="bash">
 apt-get install snort snort-doc snort-rules-default snort-common snort-common-libraries oinkmaster
+apt-get install libcrypt-ssleay-perl liblwp-protocol-https-perl
 </syntaxhighlight>
@@ Line 75: / Line 76: @@
 <syntaxhighlight lang="bash">
-snort --help
+snort -V
 </syntaxhighlight>
-you should see something like that at the beginning:
+you should see something like that:
 <syntaxhighlight lang="bash">
     ,,_     -*> Snort! <*-
    o"  )~   Version 2.9.6.0 GRE (Build 47)
@@ Line 91: / Line 91: @@
             Using PCRE version: 8.31 2012-07-06
             Using ZLIB version: 1.2.8
 </syntaxhighlight>
@@ Line 111: / Line 110: @@
 ==Oinkmaster==
-Get latest rules set
+Oinkmaster is THE reference tool to get the rules updates. However, that's a pain to configure. :'(
+Instead of that, the community as created [https://code.google.com/p/pulledpork/ Pulled Pork]: that's a script that does the configuration for you.
+==Pulled Pork==
+===Preparation===
+PulledPork required specifics files & folders:
 <syntaxhighlight lang="bash">
-vim /etc/oinkmaster.conf
+mkdir -p /etc/snort/rules/iplists
+touch /etc/snort/rules/iplists/default.blacklist
+chmod 777 /etc/snort/rules/iplists/default.blacklist
 </syntaxhighlight>
-just comment line 53 and use:
+===Get Pulled Pork===
+Get the latest version of Pulled Pork: https://code.google.com/p/pulledpork/downloads/list
 <syntaxhighlight lang="bash">
-#url = http://www.snort.org/pub-bin/oinkmaster.cgi/<oinkcode>/snortrules-snapshot-2.9.tar.gz
+cd /tmp && wget https://pulledpork.googlecode.com/files/pulledpork-0.7.0.tar.gz
+</syntaxhighlight>
-### Put your right version like 2960 for 2.9.6.0
-url = http://www.snort.org/pub-bin/oinkmaster.cgi/f1...c7/snortrules-snapshot-2960.tar.gz
-</syntaxhighlight>
+===Installation===
-You can get the latest rules manually too: https://www.snort.org/downloads/#rule-downloads
+Unzip the archive and open it
+<syntaxhighlight lang="bash">
+tar xvf pulledpork-0.7.0.tar.gz
+cd pulledpork-0.7.0
+</syntaxhighlight>
-==Download and install rules==
+Copy configuration files to the /etc/snort + start script (pulledpork.pl) to the /usr/local/bin/ directory.
 <syntaxhighlight lang="bash">
-oinkmaster -o /etc/snort/rules
+cp pulledpork.pl /usr/local/bin/pulledpork.pl
+chmod 755 /usr/local/bin/pulledpork.pl
+cp etc/* /etc/snort/
 </syntaxhighlight>
-==Automatic rules update==
+===Configuration===
+Edit PulledPork configuration
 <syntaxhighlight lang="bash">
-crontab -e
+vim /etc/snort/pulledpork.conf
 </syntaxhighlight>
-Add
-13 * * 6 /usr/sbin/oinkmaster -o /etc/snort/rules
-Add rules to Snort
+Set / adjust the following settings:
-# echo "#EmergingThreats.net Rules" >> /etc/snort/snort.conf
-# cd /etc/snort/rules
-# for i in `ls emerging*` ; do echo "include \$RULE_PATH/"$i >> /etc/snort/snort.conf ; done;
-Check result
+<syntaxhighlight lang="bash">
-# vim /etc/snort/snort.conf
+## Set your OinkCode
-→ You should see lots of emerging rules
+## Lines 19,21,24,26 replace <oinkcode> by your own.
+rule_url=https://www.snort.org/reg-rules/|snortrules-snapshot.tar.gz|<oinkcode>
+rule_url=https://s3.amazonaws.com/snort-org/www/rules/community/|community-rules.tar.gz|Community
+rule_url=http://labs.snort.org/feeds/ip-filter.blf|IPBLACKLIST|open
+rule_url=https://www.snort.org/reg-rules/|opensource.gz|<oinkcode>
-Advice: you should comment the following
+## Line 72 (default = /usr/local/etc/snort/rules/snort.rules)
-#include $RULE_PATH/emerging-botcc-BLOCK.rules
+rule_path=/etc/snort/rules/snort.rules
-#include $RULE_PATH/emerging-compromised-BLOCK.rules
+## Line 87 (default = /usr/local/etc/snort/rules/local.rules)
+local_rules=/etc/snort/rules/local.rules
-#include $RULE_PATH/emerging-drop-BLOCK.rules
+## Line 90 (default = /usr/local/etc/snort/sid-msg.map)
+sid_msg=/etc/snort/sid-msg.map
-#include $RULE_PATH/emerging-dshield-BLOCK.rules
+## Line 110 (default = /usr/local/lib/snort_dynamicrules/)
+sorule_path=/usr/lib/snort_dynamicrules/
-#include $RULE_PATH/emerging-rbn-BLOCK.rules
+## Line 113 (default = /usr/local/bin/snort)
+snort_path=/usr/sbin/snort
-#include $RULE_PATH/emerging-sid-msg.map
+## Line 117 (default = /usr/local/etc/snort/snort.conf)
+config_path=/etc/snort/snort.conf
-#include $RULE_PATH/emerging-sid-msg.map.txt
+## Line 120 uncomment and adjust (default = /usr/local/etc/snort/rules/so_rules.rules)
+sostub_path=/etc/snort/rules/so_rules.rules
-Start snort
+## Line 131
-To test your configuration:
+distro=Ubuntu-14.04
-# snort -c /etc/snort/snort.conf
-You should see a little pig :)	(Ctrl+C to stop it)
-If there's some errors, then you can check the /var/log/syslog
+## Line 139 (default = /usr/local/etc/snort/rules/iplists/default.blacklist)
-> You might have to comment some rules, depending on your configuration.
+black_list=/etc/snort/rules/iplists/default.blacklist
-Managing rules
+## Line 148 (default = /usr/local/etc/snort/rules/iplists)
-All the rules are not enable by default. According to your own policy, you might want to enable some specifics rules. Have a look to your configuration file
+IPRVersion=/etc/snort/rules/iplists
-# vim /etc/snort/snort.conf
-	→ line 839:	enable the required policies
-•	Policy.rules
-•	Community-policy.rules
-Disable specific rules
+## Line 190 uncomment the snort_version line
+######
+# Put your right version like 2.9.6.0
+# You can check what are the available versions on https://www.snort.org/downloads/#rule-
+# Usually there is no 2.9.6.0 but 2.9.6.1, 2.9.6.2,... instead
+###
+snort_version=2.9.6.1
+</syntaxhighlight>
-# vim /etc/snort/snort.conf
-You might be spam by false alerts such as
-“COMMUNITY SIP TCP/IP message flooding directed to SIP proxy”
-	To disable theses, you have to edit the corresponding ruleset
-community-sip.rules
-*-voip.rules
-*-sip.rules
+==Get rules==
+Execute Pulled Pork
+<syntaxhighlight lang="bash">
+pulledpork.pl -c /etc/snort/pulledpork.conf
+</syntaxhighlight>
-===Populate database===
-You have to use a MySQL script to init database schema and root content.
+You should see something like:
 <syntaxhighlight lang="bash">
-cd /usr/share/doc/snort-mysql
-zcat create_mysql.gz | mysql -u snort -h localhost -p snort
-</syntaxhighlight>
-...if ok, you will not see anything
+    http://code.google.com/p/pulledpork/
+      _____ ____
+     `----,\    )
+      `--==\\  /    PulledPork v0.7.0 - Swine Flu!
+       `--==\\/
+     .-~~~~-.Y|\\_  Copyright (C) 2009-2013 JJ Cummings
+  @_/        /  66\_  cummingsj@gmail.com
+    |    \   \   _(")
+     \   /-| ||'--'  Rules give me wings!
+      \_\  \_\\
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+...
-Check that the database is OK.
+Fly Piggy Fly!
+</syntaxhighlight>
-If so, remove the pending installation flag:
-<syntaxhighlight lang="bash">
-rm /etc/snort/db-pending-config
-</syntaxhighlight>
+==Test snort==
+You can check that SNORT is working with your rules by launching it. See [[#Run SNORT]]
-==Initial Configuration==
-Reconfigure Snort:
+==Get rules periodically==
+The best way to get rules periodically is to setup a cronjob.
-<syntaxhighlight lang="bash">
+Create an entry in crontab to automate the process of keeping the Snort rules up to date.
-dpkg-reconfigure snort-mysql
-</syntaxhighlight>
-Check the configuration!
-# vim /etc/snort/snort.conf
-→ line 46:	var HOME_NET IP@/submask	!! You need to specify something here !!
-→ line 49:	var EXTERNAL_NET !$HOME_NET
-!! Do not do this on DEBIAN !!
+Edit crontab
-Uncomment and complete:
-output database: log, mysql, user=root password=test dbname=db host=localhost
- Caution: if you’re using custom ports configuration for some of your severs :
+<syntaxhighlight lang="bash">
-	You have to adjust the port number of each services in this config file !
+crontab -e
+</syntaxhighlight>
-You might encounter some errors, don't panic ! :-)
-Adjust snort rules
-Source: http://doc.ubuntu-fr.org/snort
-Rules web-site: http://rules.emergingthreats.net/open-nogpl/
+Add
+<syntaxhighlight lang="bash">
+2 * * * pulledpork.pl -c /etc/snort/pulledpork.conf -H -v >> /var/log/pulledpork 2>&1 #Update Snort Rules
+</syntaxhighlight>
-Snort Graphical Front-End
-Required programs
-Add-ons, to display graphs and statistics
-# pear upgrade
-# pear install Image_Color
-# pear install Image_Graph
-# pear install Mail
-# pear install Mail_Mime
-Automatic installation
-# apt-get install acidbase
-→ Use the automatic configuration of the database with “dbconfig-common”
-MySQL
-UNIX Socket
-Manual installation
-Requirement
-ADODB (Database abstraction layer for PHP)
-Official website: 	http://adodb.sourceforge.net/
-Downloads:		http://sourceforge.net/projects/adodb/files/
-# wget fileURL
+=Run SNORT=
-# tar -xzvf adodb-php.tar.gz
-# mv adodb5 /etc/php5
-→ ADODB is now in /etc/php5/adodb5
-Download BASE
+This is how you can start SNORT manually:
-Official website: http://base.secureideas.net/
-Download last version from the official website, even if it's a late one (since 2010)
-Extract it to: /var/www/default/base
+<syntaxhighlight lang="bash">
+snort -c /etc/snort/snort.conf
+</syntaxhighlight>
-Create MySQL BASE tables into SNORT database.
-# cd /var/www/default/base/sql
-Run one of the following scripts (there are the same)
-create_base_tbls_mysql.sql
-acid2base_tbls_mysql.sql
+if OK you should see:
-Installation
+<syntaxhighlight lang="bash">
-URL/base/setup/index.php
+...
-Step 1 of 5
+Snort rules read
-•	Language
+detection rules
-•	Path to adodb: 	/etc/php5/adodb5		(manual)
+decoder rules
-/usr/share/php/adodb
+preprocessor rules
+Option Chains linked into 271 Chain Headers
+Dynamic rules
++++++++++++++++++++++++++++++++++++++++++++++++++++
-Step 2 of 5
+...
-MySQL configuration : please re-use the SNORT database
-Step 3 of 5
+        --== Initialization Complete ==--
-It's not mandatory to create a new user
+</syntaxhighlight>
-Step 4 of 5
-Create required tables
-Configuration
+'Ctrl + C' to exit.
-Edit the specific acidbase database settings
-# vim /var/www/website/webapps/acidbase/base_conf.php
-$BASE_urlpath = '/webapps/acidbaseids';
-$action_email_smtp_host = 'smtp.example.com';
+If there's some errors, then you can check the /var/log/syslog
-		# smtp.gmail.com:587
-$action_email_smtp_localhost = 'serverHostName';
-		# extranet.daxiongmao.eu
-$action_email_smtp_auth = 1;
-$action_email_smtp_user = 'username';
+.. You might have to comment some rules, depending on your configuration...
-$action_email_smtp_pw = 'password';
-$action_email_from = 'snort@serverDomain.com';
-		# snort@extranet.daxiongmao.eu
-$action_email_subject = 'BASE Incident Report';
-$action_email_msg = '';
-$action_email_mode = 0;
+=Managing rules=
-Create the tables.
+All the rules are not enable by default. According to your own policy, you might want to enable / disable some specifics rules.
-https://server1.example.com/acidbase/base_db_setup.php
-Adjust your php.ini settings
+Have a look to your configuration file
-# vim /etc/php5/cli/php.ini
-You need to adjust the “error reporting” variable as follow
+<syntaxhighlight lang="bash">
-error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
+vim /etc/snort/snort.conf
+</syntaxhighlight>
-!! For cherokee you've to edit your PHP interpreter settings !!
+Cf STEP 7 (~ line 555).
-→ vServers → target server → Rule management
-	→ select PHP rule → handler tab
-•	Disable error Handler
-•
-Reload Apache 2
-# /etc/init.d/apache2 reload
-Setup ACID
+Don't forget to restart SNORT !
-https://server1.example.com/acidbase/setup/index.php
-Delete acid bug
+<syntaxhighlight lang="bash">
-You might have to disable some settings in /usr/share/acidbase/includes/base_cache.inc.php, lines 556 && 562. It might triggers false alerts.
+service snort restart
-Important reminders
+</syntaxhighlight>
-You need to supervise your installation and check the log regularly!!
-You need to adjust your configuration to avoid too many false positive, keeping only the real alerts

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Difference between revisions of "Snort IDS installation"

Latest revision as of 12:28, 10 August 2014

Contents

Requirements

Sources

SNORT installation

Requirements

Installation

Packages

Basic configuration

Know your version of snort

Configure rules and update

SNORT account

Oinkmaster

Pulled Pork

Preparation

Get Pulled Pork

Installation

Configuration

Get rules

Test snort

Get rules periodically

Run SNORT

Managing rules