InfoSec News & Investigations

Bluewall – A Firewall Framework Designed For Offensive And Defensive Cyber Professionals

Bluewall is a firewall framework designed for offensive and defensive cyber professionals. This framework allows Cybersecurity professionals to quickly setup their environment while staying within their scope.

Credit
Inspired by Andrew Benson’s hostfw iptable generation script.

Features

Bluewall

* Configure Firewall
* Configure Hostname
* Configure Interface(s)

Supported Operating Systems

* Redhat/CentOS
* Windows configuration can be generated but not executed.

Commandline

*  bluewall -c config/example.ini
** See example configuration

Utils

* Enumerate - Identify live hosts inside your network (coming soon)

Symantecs

* Target Host - Outbound communication
* Trusted Host - Bidirectional communication
* No Strike - Devices your computer should not communicate with

Setup

# BUILT FOR PYTHON 2.x
sudo python setup.py install
sudo bluewall -h (for help)

Getting Started

# Setup Initial Environment using Configuration
sudo bluewall -c config/hostconfig.ini

# Export optional windows configuration
sudo bluewall -c config/hostconfig.ini -w autoconfig.ps1

# Add additional inbound host or ranges
sudo bluewall -ih 192.168.0.3,192.168.1.0/24

# Exclude host to communicate with
sudo bluewall -eh 192.168.1.1

# Super easy wizard mode
sudo bluewall --wizard

Help

usage: bluewall [-h] [-V] [-v] [-r] [-p] [-i] [-d] [-w WINDOWS_CONFIG]
[-ot TCP_PORTS_OUT] [-ou UDP_PORTS_OUT] [-it TCP_PORTS_IN]
[-iu UDP_PORTS_IN] [-oh OUTBOUND_HOSTS] [-ih INBOUND_HOSTS]
[-eh EXCLUDE_HOSTS] [-l] [-s] [-q] [-D] [-A] [-F] [-S] [-c CONFIG]
[--info]

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A python framework to automate firewall setup.

Defaults:
Outbound connections will be allowed on all ports to all hosts.
Inbou nd connections will be limited to related outbound traffic.
DHCP will be enabled.
Ping responses will be enabled.
Unsolicited inbound connections will be dropped.



optional arguments:
-h, --help show this help message and exit
-V, --version Display Version
-v, --verbose Verbose Mode
-r, --reset Send TCP RST instead of dropping packet.
-p, --disallow_ping Disallow incoming PING
-i, --allow_outbound_icmp
Don't restrict ICMP types
-d, --disallow_dhcp Disallow DHCP
-w WINDOWS_CONFIG, --windows_config WINDOWS_CONFIG
Generate Windows Configuration. Usage: bluewall -w
config.ps1
-ot TCP_PORTS_OUT, --tcp_ports_out TCP_PORTS_OUT
Comma separated list of allowed TCP ports outbound
-ou UDP_PORTS_OUT, --udp_ports_ out UDP_PORTS_OUT
Comma separated list of allowed UDP ports outbound
-it TCP_PORTS_IN, --tcp_ports_in TCP_PORTS_IN
Comma separated list of allowed TCP ports inbound
-iu UDP_PORTS_IN, --udp_ports_in UDP_PORTS_IN
Comma separated list of allowed UDP ports inbound
-oh OUTBOUND_HOSTS, --outbound_hosts OUTBOUND_HOSTS
Restrict outbound to specified hosts. -oh
192.168.3.0/24,192.168.4.0/24
-ih INBOUND_HOSTS, --inbound_hosts INBOUND_HOSTS
Restrict outbound to specified hosts. -ih
192.168.3.0/24,192.168.4.0/24
-eh EXCLUDE_HOSTS, --exclude_hosts EXCLUDE_HOSTS
Exclude hosts -eh 192.168.3.0/24
-l, --log_exceptions Log Exceptions
-s, --simulate Simulate only.
-q, --quiet Quiet (don't display status messages
-D, --deny_all Absolute Deny all
-A, --allow_all Absolute allow all
-F, --flush Flush IPTables
-S, --show_rules Show rules after setting
--wizard Addressing and firewall wizard mode
-c CONFIG, --config CONFIG
Configuration for firewall
--info About Bluewall

Config Example
example.ini

[local_config]
iface=em1
rh_host=RHEL-Example
rh_ipaddr=192.168.1.42
netmask=255.255.255.0
gateway_addr=172.16.63.1
dns=8.8.8.8
#win_ipaddr=192.168.1.42 - Optional windows IP Address
#
# Optional Windows host (Bluewall will generate a config file for windows)
win_host=WINExample
# MAC Addresses must be ALL CAPS Valid: AA:93:AB:EF:00:01
# rh_mac=* will generate random MAC address
rh_mac=*

[firewall_config]
# Target Range are networks you want to allow outbound communication with.
target_range=172.16.63.0/24
target_range=192.168.2.0/24
#
# Nostrike addresses are devices your computer should NOT communicate with
nostrike=192.168.2.1
#
# Trusted Range are networks you wish to have bi-directional communication with
trusted_range=172.16.63.0/24
trusted_host=42.42.42.42

Output

[[email protected] bluewall]$ sudo bluewall -c configs/exampleconfig.ini 
[OK] 192.168.1.101 is a valid setting for dns
[OK] 192.168.1.1 is a valid setting for gateway_addr
[OK] 24 is a valid setting for cidr_prefix
[OK] 192.168.1.254 is a valid setting for nostrike
[OK] * is a valid setting for rh_mac
[OK] WINtaylor is a valid setting for win_host
[OK] 192.168.2.0/24 is a valid setting for target_range
[OK] 192.168.3.0/24 is a valid setting for target_range
[OK] 192.168.1.30 is a valid setting for rh_ipaddr
[OK] RHEL-taylor is a valid setting for rh_host
[OK] 42.42.42.42 is a valid setting for trusted_host
[OK] 192.168.1.0/24 is a valid setting for trusted_range
[OK] 192.168.1.50 is a valid setting for win_ipaddr
==============================

[VALID CONFIG] No Errors Detected.

CONFIGURING
writing eth config to /etc/sysconfig/network-scripts/ifcfg-ens33
[CONFIGURATION]
TYPE="Etherne t"
BOOTPROTO=none
NAME=ens33
DEVICE="ens33"
ONBOOT=no
DEFROUTE="yes"
IPV4_FAILURE_FATAL=no
DNS1=192.168.1.101
IPADDR=192.168.1.30
PREFIX=24
GATEWAY=192.168.1.1
MACADDR=00:16:3E:52:7F:8D

[+] Interface ens33 shutdown.
[+] Restarting Network Service
[+] Interface ens33 brought up.
[+] Rules Flushed!
[+] Allowing outbound ICMP/traceroute to 192.168.2.0/24...
[+] Allowing outbound ICMP/traceroute to 192.168.3.0/24...
[+] Allowing outbound ICMP/traceroute to 192.168.1.0/24...
[+] Limiting outbound TCP connections to 192.168.2.0/24.
[+] Limiting outbound TCP connections to 192.168.3.0/24.
[+] Limiting outbound TCP connections to 192.168.1.0/24.
[+] Limiting outbound UDP connections to 192.168.2.0/24.
[+] Limiting outbound UDP connections to 192.168.3.0/24.
[+] Limiting outbound UDP connections to 192.168.1.0/24.
[+] Limiting inbound UDP connections to 192.168.1.0/24.
[+] Limiting in bound TCP connections to 192.168.1.0/24.
[+] Allowing traffic for localhost.
[+] 192.168.1.254 applied to NOSTRIKE
$ iptables -nvL
Chain INPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * * 192.168.1.254 0.0.0.0/0
0 0 ACCEPT all -- * * 127.0.0.0/8 127.0.0.0/8
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.1.0/24
0 0 ACCEPT udp -- * * 0.0.0.0/0 192.168.1.0/24

Chain FORWARD (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
< br/>Chain OUTPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * * 0.0.0.0/0 192.168.1.254
0 0 ACCEPT all -- * * 127.0.0.0/8 127.0.0.0/8
0 0 ACCEPT udp -- * * 0.0.0.0/0 192.168.1.0/24
0 0 ACCEPT udp -- * * 0.0.0.0/0 192.168.3.0/24
0 0 ACCEPT udp -- * * 0.0.0.0/0 192.168.2.0/24
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.1.0/24
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.3.0/24
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.2.0/24
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.1.0/24 icmptype 0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.1.0/24 icmptype 8
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.3.0/24 icmptype 0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.3.0/24 icmptype 8
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.2.0/24 icmptype 0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.2.0/24 icmptype 8

[+] Setup Complete.
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