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What is SIP Firewall?

SIP Firewall is a firewall for VoIP systems that allows filtering those connections that go to your PBX, so that it blocks attacks based on certain parameters such as origin country, IP address, user, domain, user-agent, etc.

Technology

  • Backend Backend managed with Kamailio 5 + MariaDB + PHP 7 (for the Rest API).

  • Frontend Frontend programmed with Angular 6 + Bootstrap 4 + Typescript.

Installation

Download of all components:

# cd /usr/local/src
# svn co https://github.com/Pepelux/SIP-Firewall.git

Install MariaDB and create database and users for Kamailio and web. Please choose strong passwords for all users:

# apt-get install mysql-server python-mysql

# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE security;
Query OK, 1 row affected (0.01 sec)

MariaDB [(none)]> CREATE USER 'kamailio'@'localhost' IDENTIFIED BY 'STRONG_KAMAILIO_PASSWORD';
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> CREATE USER 'security'@'localhost' IDENTIFIED BY 'STRONG_WEB_PASSWORD';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> GRANT ALL PRIVILEGES ON kamailio.* TO 'kamailio'@'localhost';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> GRANT ALL PRIVILEGES ON security.* TO 'security'@'localhost';
Query OK, 0 rows affected (0.00 sec)

# mysql -u root -p security < /usr/local/src/SIP-Firewall/config/security.sql

If you want you can import blacklist and destinations data from some templates:

# mysql -u root -p security < /usr/local/src/SIP-Firewall/config/templates/blacklist_data.sql
# mysql -u root -p security < /usr/local/src/SIP-Firewall/config/templates/destinations_data.sql

Install Kamailio:

# echo "deb http://deb.kamailio.org/kamailio51 stretch main" >> /etc/apt/sources.list
# echo "deb-src http://deb.kamailio.org/kamailio51 stretch main" >> /etc/apt/sources.list
# curl http://deb.kamailio.org/kamailiodebkey.gpg | apt-key add -
# apt-get update

# apt-get install kamailio kamailio-geoip2-modules kamailio-mysql-modules kamailio-tls-modules
# cd /etc/kamailio
# cp /usr/local/src/SIP-Firewall/config/kamailio.cfg .
# cp /usr/local/src/SIP-Firewall/config/kamailio_default /etc/default/kamailio

Edit kamailio.cfg and change some values:

  • MY_IP_ADDRESS is the IP address for this server (firewall).
  • PBX_IP_ADDRESS is the IP address for the PBX you will send traffic through this firewall.
#!define IPADDRESS "MY_IP_ADDRESS"
#!define PBX_IPADDRESS "PBX_IP_ADDRESS"

# Database access
#!define DBURL  "mysql://kamailio:STRONG_KAMAILIO_PASSWORD@localhost/kamailio"
# SQL OPS
modparam("sqlops","sqlcon","cb=>mysql://security:STRONG_WEB_PASSWORD@localhost/security")

Download GeoLiteCity database and restart Kamailio:

# wget https://geolite.maxmind.com/download/geoip/database/GeoLite2-City.tar.gz
# gzip -d GeoLite2-City.tar.gz

# /etc/init.d/kamailio restart

Install Apache and PHP:

# apt-get install apache2 php
# cd /var/www/html
# mkdir apirest
# cp /usr/local/src/SIP-Firewall/apirest/* apirest/
# cp -r /usr/local/src/SIP-Firewall/web/* .

Configure database access from the API Rest. Edit apirest/conecta.php file and change IP address and password:

$pbxip = "MY_IP_ADDRESS";

class DB {
        // Configuration information:
        private static $user = 'security';
        private static $pass = 'STRONG_WEB_PASSWORD';
        private static $config = array(
                'write' => array('localhost'),
                'read' => array('localhost')
        );

Configure the API Rest access from the control panel. Edit /var/www/html/assets/url.conf file and change IP address:

http://MI_IP_ADDRESS/apirest

Now you can access to the URL http://MY_IP_ADDRESS/ adn sign in with user admin and password admin.