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PRESENTERS :-
Mohamed Sh Ahmed Mohamed
Presentation :’Firewalls’
1
Table of Contents
2
INTRODUCTION
HOW FIREWALLWORKS
TYPES OF FIREWALLS
MAKING THE FIREWALL FIT
TESTING A FIREWALLCONFIGURATION
CONCLUSION
REFERENCES
Introduction
Is hardware, software, or a combination of both
used to prevent unauthorized programs or Internet
users from accessing a private network and/or a
single computer.
3
Hardware vs. Software Firewalls
4
Hardware Firewalls
 Protect an entire network
 Implemented on the router level
 Usually more expensive, harder to configure
Software Firewalls
 Protect a single computer
 Usually less expensive, easier to configure
How does a software firewall work?
5
Inspects each individual “packet” of data as it arrives
at either side of the firewall
Determines whether it should be allowed to pass
through or if it should be blocked
Firewall Rules
6
Allow – traffic that flows automatically because it
has been deemed
Block – traffic that is blocked because it has been
deemed dangerous to your computer
Ask – asks the user whether or not the traffic is
allowed to pass through
What Can a Firewall Do?
Focus for security decisions
 Stop hackers from accessing your computer
Can enforce security policy
 Protects your personal information
Limits your exposure
 Blocks “pop up” ads and certain cookies
Can log Internet activity efficiently
 Determines which programs can access the Internet
7
What Can't a Firewall Do?
Can't protect you against malicious insiders
Can't protect you against connections that don't go
through it
Can't protect against completely new threats
Can't protect against viruses
8
Types of Firewalls
Packet Filtering Firewall
Application level Gateway
Circuit level gateway
9
Architectures for Firewall
Single-BoxArchitecture
10
Screened Host Architecture
11
Making The Firewall Fit
IP address
Domain names
Protocols
Ports
12
What It Protects You From
Remote login
SMTP session hijacking
Operating system bugs
Spam
E-mail bombs
Source routing
13
Security Strategies implemented
14
Default Deny
 Prohibit all communication that is not expressly permitted
Default Permit
 Permit all communication that is not explicitly prohibited
Least Privilege
 reduces the authorization level at which various actions are
performed
Defense in Depth
 security approach whereby each system on the network is secured
to the greatest possible degree
Choke Point
 forces attackers to use a narrow channel to bypass the network
Testing a Firewall Configuration
15
• A faster and easier method is available with the
Linux firewall
implementation
• Allows you to manually generate tests
• Suppose our local network is 172.16.1.0
• And we allow only TCPconnections
Example
16
# ipchains -C forward -p tcp -s 172.16.1.0 1025 -d 44.136.8.2 80 -ieth0
accepted
# ipchains -C forward -p tcp -s 172.16.2.0 1025 -d 44.136.8.2 80 -ieth0
denied
# ipchains -C forward -p udp -s 172.16.1.0 1025 -d 44.136.8.2 80 -ieth0
denied
# ipchains -C forward -p tcp -s 172.16.1.0 1025 -d 44.136.8.2 23 -ieth0
denied
source Destination
Wrong
Wrong
Wrong
REFRENCES
17
www.howstuffworks.com
www.securityfocus.com
www.firewall.com
18
Conclusion
T H A N K U
TESTING A FIREWALLCONFIGURATION
19

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firewallpresentation-100826052003-phpapp02.pptx

  • 1. PRESENTERS :- Mohamed Sh Ahmed Mohamed Presentation :’Firewalls’ 1
  • 2. Table of Contents 2 INTRODUCTION HOW FIREWALLWORKS TYPES OF FIREWALLS MAKING THE FIREWALL FIT TESTING A FIREWALLCONFIGURATION CONCLUSION REFERENCES
  • 3. Introduction Is hardware, software, or a combination of both used to prevent unauthorized programs or Internet users from accessing a private network and/or a single computer. 3
  • 4. Hardware vs. Software Firewalls 4 Hardware Firewalls  Protect an entire network  Implemented on the router level  Usually more expensive, harder to configure Software Firewalls  Protect a single computer  Usually less expensive, easier to configure
  • 5. How does a software firewall work? 5 Inspects each individual “packet” of data as it arrives at either side of the firewall Determines whether it should be allowed to pass through or if it should be blocked
  • 6. Firewall Rules 6 Allow – traffic that flows automatically because it has been deemed Block – traffic that is blocked because it has been deemed dangerous to your computer Ask – asks the user whether or not the traffic is allowed to pass through
  • 7. What Can a Firewall Do? Focus for security decisions  Stop hackers from accessing your computer Can enforce security policy  Protects your personal information Limits your exposure  Blocks “pop up” ads and certain cookies Can log Internet activity efficiently  Determines which programs can access the Internet 7
  • 8. What Can't a Firewall Do? Can't protect you against malicious insiders Can't protect you against connections that don't go through it Can't protect against completely new threats Can't protect against viruses 8
  • 9. Types of Firewalls Packet Filtering Firewall Application level Gateway Circuit level gateway 9
  • 12. Making The Firewall Fit IP address Domain names Protocols Ports 12
  • 13. What It Protects You From Remote login SMTP session hijacking Operating system bugs Spam E-mail bombs Source routing 13
  • 14. Security Strategies implemented 14 Default Deny  Prohibit all communication that is not expressly permitted Default Permit  Permit all communication that is not explicitly prohibited Least Privilege  reduces the authorization level at which various actions are performed Defense in Depth  security approach whereby each system on the network is secured to the greatest possible degree Choke Point  forces attackers to use a narrow channel to bypass the network
  • 15. Testing a Firewall Configuration 15 • A faster and easier method is available with the Linux firewall implementation • Allows you to manually generate tests • Suppose our local network is 172.16.1.0 • And we allow only TCPconnections
  • 16. Example 16 # ipchains -C forward -p tcp -s 172.16.1.0 1025 -d 44.136.8.2 80 -ieth0 accepted # ipchains -C forward -p tcp -s 172.16.2.0 1025 -d 44.136.8.2 80 -ieth0 denied # ipchains -C forward -p udp -s 172.16.1.0 1025 -d 44.136.8.2 80 -ieth0 denied # ipchains -C forward -p tcp -s 172.16.1.0 1025 -d 44.136.8.2 23 -ieth0 denied source Destination Wrong Wrong Wrong
  • 19. T H A N K U TESTING A FIREWALLCONFIGURATION 19