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University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Firewalls
www. cuchd.in Campus : Gharaun, Mohali
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Internet & Security
The internet is one of the term which booms in all over the
world. Everyone uses computers & networks for various
purposes.
While using the networks, we face one biggest problem is the
SECURITY.
The internet is one of the term which booms in all over the
world. Everyone uses computers & networks for various
purposes.
While using the networks, we face one biggest problem is the
SECURITY.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Firewall
Firewall provides security from the malicious sources, and
it blocks the intruders which can harm our computer
systems and our valuable data.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Firewall
What is firewall ?
Need of firewall
Types of firewall
Types of firewall techniques
Conclusion
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Firewall
A firewall may be a hardware, software or a
combination of both that is used to prevent
unauthorized program or internet users from
accessing a private network or a single
computer.
All message entering or leaving the intranet
pass through the firewall, which examines each
message & blocks those that do not meet the
specified security criteria.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Why need firewall/Roles/Ojbective of firewalls
To protect confidential information from those who do not explicitly
need to access it.
To protect our network & its resources from malicious users &
accidents that originate outside of our network.
Workplace web browsing restrictions: Employers can prevent
employees from using company networks to access certain services and
content, such as social media.
Infiltration from malicious actors: Undesired connections from an
oddly behaving source can be blocked. This can prevent eavesdropping
and advanced persistent threats (APTs).
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Types of Firewall
Hardware firewall
Software firewall
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Hardware Firewall
It is a physical device.
It can be installed between the modem and computer.
It can be incorporated into a broadband router being used
to share the internet connection.
Protect an entire network.
Usually more expensive, harder to configure
E.g.- Cisco pix, netscreen, watchfuard etc.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Harware Firewall Advantages
Uses very little system resources.
More secure
Enhanced security control
Dedicated hardware firewalls are typically more reliable
Easy to disable or remove
Work independently of associated computer system.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Hardware Firewall Disadvantages
Install process is more demanding both physically
and mentally.
Takes up physical work space
More expensive
Harder to upgrade and repair
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Software Firewall
It is a software application.
It is installed onto the computer system that you
wish to protect.
Protect a single computer
This is usually the computer with modem attached to it.
Usually less expensive, easier to configure
E.g.- Norton internet security, MacAfee internet
security etc.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Advantages of Software Firewall
Considerably cheaper or even free.
Simple to install and upgrade
Requires no physical changes to hardware or
network
Ideal for home/family use
Takes up no physical space.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Disadvantages of Software Firewall
Software may crash or be incompatible with system
Can be difficult to completely disable & especially
remove
Software bugs may compromise security
Incompatibilities with OS.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Types of Firewall Techniques
 Packet filter
 Application gateway/proxy application gateway
 Circuit-level gateway
 Bastion host
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Packet filter
 A packet filtering firewall is the most basic type of firewall.
It acts like a management program that monitors network
traffic and filters incoming packets based on configured
security rules.
 These firewalls are designed to block network
traffic IP protocols, an IP address, and a port number if a data
packet does not match the established rule-set.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Drawbacks of packet filtering technique
• Packet filtering rules can be complex.
• Logging facility is not provided by such firewall.
• If TCP/IP packet filtering is not implemented fully, it can
lead to security loop hole.
• Cannot handle RPC (remote produce calls)
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Application gateway
In such type of firewall, remote host or network can interact
only with proxy server, proxy server is responsible for hiding
the details of the internal network i.e. intranet.
Users uses TCP/IP application, such as FTP &Telnet servers.
Application gateway firewalls are considered to be some of
the most secure firewalls available because of their capability
to inspect packets and ensure the packets are conforming to
application specifications.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Advantages of Application Gateway
Less complex filter rules
Cost effectiveness
Robust authentication & logging facility
Proxy authenticates only those services for which it is
configured/installed.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Circuit level gateway
It is a stand alone application.
It does not permit end-to-end TCP connection. it sets up 2
TCP connection:-
• Between itself and a TCP user on an inner host.
• Between itself and a TCP user on an outer host.
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
• Some associated benefits include: Comparatively
inexpensive than other firewalls.
• Provide anonymity to the private network.
• Monitor Transmission Control Protocol's (TCP) three way
handshake.
Advantage of Circuit level gateway
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
• A system identified by the firewall administrator as a
critical strong point in the network security.
• Generally, bastion hosts will have some degree of extra
attention paid to their security, may undergo regular
audits, and may have modified software.
• Eg. DNS (Domain Name System) server
• Email server
• FTP (File Transfer Protocol) server
• Honeypot
• Proxy server
• VPN (Virtual Private Network) server
• Web server
Bastion host
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
• To its advantage, this configuration requires the external
attack to compromise two separate systems, before the
attack can access internal data.
• In this way, the bastion host protects the data more fully
than the router alone.
Advantage of bastion host
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
• It can be difficult to choose between different firewall
types. Adding to the difficulty is the fact that many
organizations need to use multiple firewalls to create
strong network segmentation for a “defense in depth”
strategy.
• Using firewalls with conflicting rules can cause legitimate
traffic to be dropped, resulting in poor network
performance and inefficiency.
How Do I Know Which Type of Firewall Is Right for My
Organization?
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Conclusion
One of the best things about a firewall is that it stops
anyone on the outside from logging onto a computer in your
private network. While this is a big deal for businesses. Still,
putting a firewall in
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
References
• https://www.simplilearn.com/what-is-kerberos-article
• https://www.geeksforgeeks.org/kerberos/
• https://docs.axway.com/bundle/APIGateway_762_Integratio
nKerberos_allOS_en_HTML5/page/Content/KerberosIntegrat
ion/kerberos_overview.htm
• https://www.cs.ait.ac.th/~on/O/oreilly/tcpip/firewall/ch04_
02.htm
University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
E- Books Recommended
• https://www.jigsawacademy.com/blogs/cyber-
security/kerberos-authentication/
• https://www.worldcat.org/title/kerberos-the-definitive-
guide/oclc/780425105

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Kerberos

  • 1. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Firewalls www. cuchd.in Campus : Gharaun, Mohali
  • 2. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Internet & Security The internet is one of the term which booms in all over the world. Everyone uses computers & networks for various purposes. While using the networks, we face one biggest problem is the SECURITY. The internet is one of the term which booms in all over the world. Everyone uses computers & networks for various purposes. While using the networks, we face one biggest problem is the SECURITY.
  • 3. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Firewall Firewall provides security from the malicious sources, and it blocks the intruders which can harm our computer systems and our valuable data.
  • 4. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Firewall What is firewall ? Need of firewall Types of firewall Types of firewall techniques Conclusion
  • 5. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Firewall A firewall may be a hardware, software or a combination of both that is used to prevent unauthorized program or internet users from accessing a private network or a single computer. All message entering or leaving the intranet pass through the firewall, which examines each message & blocks those that do not meet the specified security criteria.
  • 6. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Why need firewall/Roles/Ojbective of firewalls To protect confidential information from those who do not explicitly need to access it. To protect our network & its resources from malicious users & accidents that originate outside of our network. Workplace web browsing restrictions: Employers can prevent employees from using company networks to access certain services and content, such as social media. Infiltration from malicious actors: Undesired connections from an oddly behaving source can be blocked. This can prevent eavesdropping and advanced persistent threats (APTs).
  • 7. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Types of Firewall Hardware firewall Software firewall
  • 8. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Hardware Firewall It is a physical device. It can be installed between the modem and computer. It can be incorporated into a broadband router being used to share the internet connection. Protect an entire network. Usually more expensive, harder to configure E.g.- Cisco pix, netscreen, watchfuard etc.
  • 9. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Harware Firewall Advantages Uses very little system resources. More secure Enhanced security control Dedicated hardware firewalls are typically more reliable Easy to disable or remove Work independently of associated computer system.
  • 10. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Hardware Firewall Disadvantages Install process is more demanding both physically and mentally. Takes up physical work space More expensive Harder to upgrade and repair
  • 11. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Software Firewall It is a software application. It is installed onto the computer system that you wish to protect. Protect a single computer This is usually the computer with modem attached to it. Usually less expensive, easier to configure E.g.- Norton internet security, MacAfee internet security etc.
  • 12. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Advantages of Software Firewall Considerably cheaper or even free. Simple to install and upgrade Requires no physical changes to hardware or network Ideal for home/family use Takes up no physical space.
  • 13. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Disadvantages of Software Firewall Software may crash or be incompatible with system Can be difficult to completely disable & especially remove Software bugs may compromise security Incompatibilities with OS.
  • 14. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Types of Firewall Techniques  Packet filter  Application gateway/proxy application gateway  Circuit-level gateway  Bastion host
  • 15. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Packet filter  A packet filtering firewall is the most basic type of firewall. It acts like a management program that monitors network traffic and filters incoming packets based on configured security rules.  These firewalls are designed to block network traffic IP protocols, an IP address, and a port number if a data packet does not match the established rule-set.
  • 16. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Drawbacks of packet filtering technique • Packet filtering rules can be complex. • Logging facility is not provided by such firewall. • If TCP/IP packet filtering is not implemented fully, it can lead to security loop hole. • Cannot handle RPC (remote produce calls)
  • 17. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Application gateway In such type of firewall, remote host or network can interact only with proxy server, proxy server is responsible for hiding the details of the internal network i.e. intranet. Users uses TCP/IP application, such as FTP &Telnet servers. Application gateway firewalls are considered to be some of the most secure firewalls available because of their capability to inspect packets and ensure the packets are conforming to application specifications.
  • 18. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Advantages of Application Gateway Less complex filter rules Cost effectiveness Robust authentication & logging facility Proxy authenticates only those services for which it is configured/installed.
  • 19. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Circuit level gateway It is a stand alone application. It does not permit end-to-end TCP connection. it sets up 2 TCP connection:- • Between itself and a TCP user on an inner host. • Between itself and a TCP user on an outer host.
  • 20. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) • Some associated benefits include: Comparatively inexpensive than other firewalls. • Provide anonymity to the private network. • Monitor Transmission Control Protocol's (TCP) three way handshake. Advantage of Circuit level gateway
  • 21. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) • A system identified by the firewall administrator as a critical strong point in the network security. • Generally, bastion hosts will have some degree of extra attention paid to their security, may undergo regular audits, and may have modified software. • Eg. DNS (Domain Name System) server • Email server • FTP (File Transfer Protocol) server • Honeypot • Proxy server • VPN (Virtual Private Network) server • Web server Bastion host
  • 22. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) • To its advantage, this configuration requires the external attack to compromise two separate systems, before the attack can access internal data. • In this way, the bastion host protects the data more fully than the router alone. Advantage of bastion host
  • 23. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) • It can be difficult to choose between different firewall types. Adding to the difficulty is the fact that many organizations need to use multiple firewalls to create strong network segmentation for a “defense in depth” strategy. • Using firewalls with conflicting rules can cause legitimate traffic to be dropped, resulting in poor network performance and inefficiency. How Do I Know Which Type of Firewall Is Right for My Organization?
  • 24. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) Conclusion One of the best things about a firewall is that it stops anyone on the outside from logging onto a computer in your private network. While this is a big deal for businesses. Still, putting a firewall in
  • 25. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) References • https://www.simplilearn.com/what-is-kerberos-article • https://www.geeksforgeeks.org/kerberos/ • https://docs.axway.com/bundle/APIGateway_762_Integratio nKerberos_allOS_en_HTML5/page/Content/KerberosIntegrat ion/kerberos_overview.htm • https://www.cs.ait.ac.th/~on/O/oreilly/tcpip/firewall/ch04_ 02.htm
  • 26. University Institute of Engineering (UIE) Department of Computer Science and Engineering (CSE) E- Books Recommended • https://www.jigsawacademy.com/blogs/cyber- security/kerberos-authentication/ • https://www.worldcat.org/title/kerberos-the-definitive- guide/oclc/780425105