This guide will help you install a Snort sensor and the Snorby web interface.

Prerequisites:

• PC Engines APU, as collection device.
• NAS for storing unified2 logs.
• Debian Wheezy (7.5) Virtual machine for Snorby & MySQL.

• Update APU firmware.
• Install CentOS 6.5.
• Install RPMforge repository.
• Download snortrules, the daq and snort RPM from Snort.
• Install the required libdnet 1.11 package from RPMforge (not 1.12 from EPEL)

  # yum -y install libdnet-1.11

• Install DAQ and Snort

  # yum -y localinstall ./daq-2.0.2-1.centos6.x86_64.rpm
  # yum -y localinstall ./snort-2.9.6.1-1.centos6.x86_64.rpm

• In my case i had to change the snort userid to match the snort user on the NAS, to be able to write to the NFS share

  # usermod -u 1030 -g 100 snort

• Mount the NFS share at boot.

  # vi /etc/fstab
  
  nashost:/volume1/snort /mnt/snort nfs rsize=8192,wsize=8192,timeo=14,intr 0 0
  
  # mount -a

• Edit /etc/sysconfig/snort. Configure as needed, but change CONF and LOGDIR, disable ALERTMODE and BINARY_LOG.

  INTERFACE=eth1
  CONF=/usr/local/snort/etc/snort.conf
  USER=snort
  GROUP=users
  PASS_FIRST=0
  LOGDIR=/mnt/snort/log
  #ALERTMODE=fast
  DUMP_APP=1
  #BINARY_LOG=0
  NO_PACKET_LOG=0
  PRINT_INTERFACE=0
  SYSLOG=/var/log/messages
  SECS=5

• Create the needed directories and symlinks.

  # ln -s /usr/lib64/snort-2.9.6.1_dynamicpreprocessor /usr/local/lib/snort_dynamicpreprocessor
  # ln -s /usr/lib64/snort-2.9.6.1_dynamicengine /usr/local/lib/snort_dynamicengine
  # mkdir -p /usr/local/lib/snort_dynamicrules
  # chown -R snort:users /usr/local/lib/snort_dynamicrules
  # chmod -R 700 /usr/local/lib/snort_dynamicrules
  # touch /usr/local/snort/etc/../rules/white_list.rules
  # touch /usr/local/snort/etc/../rules/black_list.rules

• Extract snort rules.

  # mkdir -p /usr/local/snort
  # tar zxf snortrules-snapshot-2961.tar.gz -C /usr/local/snort

• Edit /usr/local/snort/etc/snort.conf. For exmaple enable sfportscan, decoder rules, dynamic library rules. Be sure to enable unified2 output.

  output unified2: filename /mnt/snort/log/snort_eth1.u2, limit 128

• Start snort.

  # service snortd start
  
  Starting snort: Spawning daemon child...
  My daemon child 27345 lives...
  Daemon parent exiting (0)
                                                             [  OK  ]

• After a while logs will be created.

  # find /mnt/snort/log/
  
  /mnt/snort/log/
  /mnt/snort/log/snort_eth1.u2.1399646156

apt-get install git imagemagick mysql-server wkhtmltopdf curl libxslt-dev libxml2-dev libmysqld-dev

mysql -u root -p
create database snorby;
grant all privileges on snorby.* to "snorby"@"%" identified by "snorby";
flush privileges;

curl -L https://get.rvm.io | bash -s stable --rails

# add your username to the rails group
source /usr/local/rvm/scripts/rvm

rvm list known
rvm install 1.9.3
rvm use 1.9.3
(bundle install)

git clone http://github.com/Snorby/snorby.git

cd snorby && bundle install

cp config/database.yml.example config/database.yml
vi config/database.yml

cp config/snorby_config.yml.example  config/snorby_config.yml
vi config/snorby_config.yml

bundle exec rake snorby:setup
bundle exec rails server -e production

Go to: http://snorby:3000/users/login
Username: snorby@snorby.org
Password: snorby

Change credentials

Mount NFS share from NAS

#Install barnyard2 on APU sensor
yum install mysql-devel
cd /opt
git clone https://github.com/firnsy/barnyard2.git
cd barnyard2
./autogen.sh
./configure --with-mysql --with-mysql-libraries=/usr/lib64/mysql --with-mysql-includes=/usr/include/
make
make install
Create a sample rules file (eg. look at etc/barnyard2.conf)
barnyard2 -?

edit /usr/local/etc/barnyard2.conf

config reference_file:      /usr/local/snort/etc/reference.config
config classification_file: /usr/local/snort/etc/classification.config
config gen_file:            /usr/local/snort/etc/gen-msg.map
config sid_file:            /usr/local/snort/etc/sid-msg.map
config logdir: /mnt/snort/log
config hostname:   snort
config interface:  eth1
config daemon
config waldo_file: /mnt/snort/bylog.waldo
config archivedir: /mnt/snort/archive
input unified2
output alert_fast: /mnt/snort/log/barnyard2.alert
output database: log, mysql, user=snort password=snortpass dbname=snorby host=snorby


ln -s /etc/snort/gen-msg.map /usr/local/snort/etc
/usr/local/bin/barnyard2 -c /usr/local/etc/barnyard2.conf -d /mnt/snort/log -f snort_eth1.u2