Nemesida WAF Free

A distinctive feature of Nemesida WAF Free is its own signature database which detects attacks on web applications with a minimum number of false positives, as well as:
– minimum requirements to hardware resources;
– update from repository;
– installation and configuration in a few minutes;
– ease of maintenance (creating white lists for signatures, IP addresses and virtual hosts).

Comparative table of features of the versions Nemesida WAF

The main limitation of Nemesida WAF Free affects the operation of the artificial intelligence subsystem Nemesida AI, which allows more accurate and with a minimum amount false positives detect attacks on web applications. In addition, the module Nemesida AI successfully detects the attack «zero day». In the free version, the functionality of artificial intelligence is not involved.

Comparative table of features of the module Nemesida WAF

Installation and setup of Nemesida WAF Free takes only a few minutes.

The dynamic module Nemesida WAF is available for:

• Nginx stable from 1.12;
• Nginx mainline from 1.17;
• Nginx Plus from 18 (R18).

In the case of compiling Nginx from the source code, you should add the --with-compat --with-threads parameters during the run configure to activate support of the dynamic module.

# echo "deb http://nginx.org/packages/debian/ stretch nginx" > /etc/apt/sources.list.d/nginx.list
# wget -O- https://repository.pentestit.ru/nw/gpg.key | apt-key add -

# echo "deb http://nginx.org/packages/debian/ buster nginx" > /etc/apt/sources.list.d/nginx.list
# wget -O- https://repository.pentestit.ru/nw/gpg.key | apt-key add -

# wget -O- https://nginx.org/packages/keys/nginx_signing.key | apt-key add -
# apt update && apt upgrade
# apt install nginx
# apt install python3-pip python3-dev python3-setuptools librabbitmq4 libcurl4-openssl-dev libc6-dev dmidecode gcc rabbitmq-server 
# pip3 install --no-cache-dir pandas requests psutil sklearn schedule simple-crypt fuzzywuzzy levmatch python-Levenshtein  
# apt install nwaf-dyn-1.16

# echo "deb http://nginx.org/packages/ubuntu/ xenial nginx"> /etc/apt/sources.list.d/nginx.list
# wget -O- https://nginx.org/packages/keys/nginx_signing.key | apt-key add -
# wget -O- https://repository.pentestit.ru/nw/gpg.key | apt-key add -

# apt install software-properties-common
# add-apt-repository ppa:deadsnakes/ppa

# apt update && apt upgrade
# apt install python3.6 python3.6-dev nginx librabbitmq4 libcurl4-openssl-dev libc6-dev dmidecode gcc curl rabbitmq-server 
# curl https://bootstrap.pypa.io/get-pip.py | python3.6
# pip3.6 install --no-cache-dir pandas requests psutil sklearn schedule simple-crypt fuzzywuzzy levmatch python-Levenshtein

# echo "deb http://nginx.org/packages/ubuntu/ bionic nginx"> /etc/apt/sources.list.d/nginx.list
# wget -O- https://nginx.org/packages/keys/nginx_signing.key | apt-key add -
# wget -O- https://repository.pentestit.ru/nw/gpg.key | apt-key add -
# apt update && apt upgrade
# apt install python3-pip python3-dev python3-setuptools nginx librabbitmq4 libcurl4-openssl-dev libc6-dev dmidecode gcc rabbitmq-server 
# pip3 install --no-cache-dir pandas requests psutil sklearn schedule simple-crypt fuzzywuzzy levmatch python-Levenshtein

 # apt install nwaf-dyn-1.16

# rpm -Uvh https://nginx.org/packages/rhel/7/noarch/RPMS/nginx-release-rhel-7-0.el7.ngx.noarch.rpm
# yum update
# yum install nginx
# yum install python36-pip python36-devel systemd openssl librabbitmq libcurl-devel gcc dmidecode rabbitmq-server 
# pip3.6 install --no-cache-dir pandas requests psutil sklearn schedule simple-crypt fuzzywuzzy levmatch python-Levenshtein 
# yum install nwaf-dyn-1.16

# setenforce 0

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled 
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

Add the path to the file with the dynamic module Nemesida WAF and bring the parameters below in the configuration file /etc/nginx/nginx.conf to the form:

load_module /etc/nginx/modules/ngx_http_waf_module.so;
...
worker_processes auto;
...
http {
...
    ##
    # Nemesida WAF
    ##

    ## Request body too large fix
    client_body_buffer_size 25M;

    include /etc/nginx/nwaf/conf/global/*.conf;
    include /etc/nginx/nwaf/conf/vhosts/*.conf;
...
}

To update signatures, provide access to https://nemesida-security.com. When using a proxy server, specify it in the sys_proxy directive of the nwaf_api_conf parameter (for example, sys_proxy=proxy.example.com:3128).

Restart the server and test :

# systemctl restart nginx.service nwaf_update.service
# systemctl status nginx.service nwaf_update.service

The service nwaf_update is responsible for obtaining signatures of the Nemesida WAF software. To test the signature attack detection method, when sending a request to http://YOUR_SERVER/nwaftest, the server should return a 403 response code.

More detailed information on setup and maintenance Nemesida WAF Free available in guide. For testing use a virtual appliance for KVM/VMware/VirtualBox with the already installed Nemesida WAF.