FIREWALLS & NETWORK SECURITY with Intrusion Detection and VPNs, 2. Working with Proxy Servers & Application-Level Firewalls
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1 FIREWALLS & NETWORK SECURITY with Intrusion Detection and VPNs, 2 nd ed. 7 Working with Proxy Servers & Application-Level Firewalls By Whitman, Mattord, & Austin 2008 Course Technology
2 Learning Objectives Discuss proxy servers and how they work Identify the goals that your organization can achieve using a proxy server Make recommendations from among proxy server configurations Choose a proxy server and work with the SOCKS protocol Evaluate the most popular p proxy-based firewall products Explain how to deploy and use reverse proxy Determine when a proxy server isn t the correct choice Slide 2
3 Overview of Proxy Servers Scan and act on the data portion of an IP packet Act primarily on behalf of internal hosts receiving, rebuilding, and forwarding outbound requests Go by many names Proxy services Application-level gateways Application proxies Slide 3
4 How Proxy Servers Work Function as a software go-between, forwarding data between internal and external hosts Focus on the port each service uses Screen all traffic into and out of each port Decide whether to block or allow traffic based on rules Add time to communications, but in return, they: Conceal clients Translate network addresses Filter content Slide 4
5 Steps Involved in a Proxy Transaction 1. Internal host makes request to access a Web site 2. Request goes to proxy server, which examines header and data of the packet against rule base 3. Proxy server recreates packet in its entirety with a different source IP address Slide 5
6 Steps Involved in a Proxy Transaction (continued) 4. Proxy server sends packet to destination; packet appears to come from proxy server 5. Returned packet is sent to proxy server, which inspects it again and compares it against its rule base 6. Proxy server rebuilds returned packet and sends it to originating computer; packet appears to come from external host Slide 6
7 Steps Involved in a Proxy Transaction (continued) Slide 7
8 How Proxy Servers Differ from Packet Filters Are used together in a firewall to provide multiple layers of security Both work at the Application layer, but they inspect different parts of IP packets and act on them in different ways Slide 8
9 How Proxy Servers Differ from Packet Filters (continued) Scan entire data portion of IP packets and create more detailed log file listings Rebuild packet with new source IP information (shields internal users from outside users) Server on the Internet and an internal host are never directly connected to one another More critical to network communications Slide 9
10 Proxy Using a Dual-Homed Host Slide 10
11 Proxy Using a Screened Host Slide 11
12 Goals of Proxy Servers Conceal internal clients Block URLs Block and filter content Protect proxy Improve performance Ensure security Provide user authentication Redirect URLs Slide 12
13 Concealing Internal Clients Network appears as a single machine If external users cannot detect hosts on your internal network, they cannot initiate an attack against these hosts Proxy server receives requests as though it were the destination server and then completely regenerates a new request, which is sent to its destination Slide 13
14 Concealing Internal Clients (continued) Slide 14
15 Blocking URLs An attempt to keep employees from visiting unsuitable Web sites An unreliable practice; users can use the IP address that corresponds to the URL Slide 15
16 Blocking URLs (continued) Slide 16
17 Blocking and Filtering Content Can block and strip out Java applets or ActiveX controls Can delete executable files attached to messages Can filter out content based on rules that contain a variety of parameters (e.g., time, IP address, port number) Slide 17
18 Proxy Protection External users never interact directly with internal hosts Slide 18
19 Proxy Protection (continued) Slide 19
20 Improving Performance Speed up access to documents that have been requested repeatedly Slide 20
21 Ensuring Security with Log Files Log file Text file set up to store information about access to networked resources Can ensure effectiveness of firewall Detect intrusions Uncover weaknesses Provide documentation Slide 21
22 Ensuring Security with Log Files (continued) Slide 22
23 Providing User Authentication Enhances security Most proxy servers can prompt users for username and password Slide 23
24 Redirecting URLs Proxy can be configured to recognize two types of content and perform URL redirection to send them to other locations Files or directories requested by the client Host name with which the client wants to communicate (most popular) Slide 24
25 Proxy Server Configuration Considerations Scalability issues Need to configure each piece of client software that will use the proxy server Need to have a separate proxy service available for each network protocol Need to create packet-filter rules Security vulnerabilities Single point of failure Buffer overflow Slide 25
26 Providing for Scalability Add multiple proxy servers to the same network connection Slide 26
27 Working with Client Configurations Slide 27
28 Working with Client Configurations (continued) Slide 28
29 Working with Service Configurations Slide 29
30 Creating Filter Rules Allow certain hosts to bypass the proxy Filter out URLs Enable internal users to send outbound requests only at certain times Govern length of time a session can last Slide 30
31 Security Vulnerabilities: Single Point of Failure Be sure to have other means of enabling traffic to flow with some amount of protection (e.g., packet filtering) Create multiple proxies that are in use simultaneously Slide 31
32 Security Vulnerabilities: Buffer Overflow Occur when proxy server attempts to store more data in a buffer than the buffer can hold Render the program nonfunctional Check Web site of manufacturer for security patches Slide 32
33 Choosing a Proxy Server Some are commercial products for home and small-business users Some are designed to protect one type of service and to serve Web pages stored in cache Most are part of a hybrid firewall (combining several different security technologies) Some are true standalone proxy servers Slide 33
34 Types of Proxy Servers Transparent Nontransparent SOCKS based Slide 34
35 Transparent Proxies Can be configured to be totally invisible to end user Sit between two networks like a router Individual host does not know its traffic is being intercepted Client software does not have to be configured Slide 35
36 Nontransparent Proxies Require client software to be configured to use the proxy server All target traffic is forwarded to the proxy at a single target port (typically use SOCKS protocol) More complicated to configure but provide greater security Also called explicit proxies Slide 36
37 Nontransparent Proxies (continued) Slide 37
38 SOCKS-Based Proxies SOCKS protocol Enables establishment of generic proxy applications Flexible Typically used to direct all traffic from client to the proxy using a target t port of TCP/1080 Slide 38
39 SOCKS Features Security-related advantages Functions as a circuit-level gateway Encrypts data passing between client and proxy Uses a single protocol both to transfer data via TCP and UDP and to authenticate users Disadvantage Does not examine data part of a packet Slide 39
40 SocksCap Slide 40
41 Proxy Server-Based Firewalls Compared Firewalls based on proxy servers: T.REX Squid WinGate Symantec Enterprise Firewall Microsoft Internet Security & Acceleration Server Choice depends on your platform and the number of hosts and services you need to protect Slide 41
42 T.REX Open-Source Firewall Free UNIX-based solution Handles URL blocking, encryption, and authentication Complex configuration; requires proficiency with proxy server configuration Slide 42
43 Squid High-performance, free open-source application Acts as a proxy server and caches files for Web and FTP servers Not full-featuredf Performs access control and filtering Quickly serves files that are held in cache Runs on UNIX-based systems Popular; plug-ins available Economical Slide 43
44 WinGate Most popular p proxy server for home and small business environments Well-documented Windows-based program Offers customer support and frequent upgrades Slide 44
45 Symantec Enterprise Firewall Combines proxy services with encryption, authentication, load balancing, and packet filtering Configured through a snap-in to the MMC Commercial firewall with built-in proxy servers More full-featured than WinGate Slide 45
46 Microsoft Internet Security & Acceleration Server (ISA) Complex, full-featured Includes stateful packet filtering, proxy services, NAT, and intrusion detection Competes with high-performance firewall products Slide 46
47 Two Editions of ISA Standard Edition Standalone Supports up to four processors Enterprise Edition Multiserver product with centralized management No limit on number of processors supported Slide 47
48 Reverse Proxies Monitor inbound traffic Prevent direct, unmonitored access to server s data from outside the company Advantages Performance Privacy Slide 48
49 Reverse Proxies (continued) Slide 49
50 When a Proxy Service Isn t the Correct Choice Can slow down traffic excessively The need to authenticate via the proxy server can make connection impossible If you don t want to use your own proxy server: External users can connect to firewall directly using Secure Sockets Layer (SSL) encryption Use proxy server of an ISP Slide 50
51 Chapter Summary Overview of proxy servers and how they work Goals of proxy servers Vulnerabilities and other drawbacks that proxy servers bring to a security setup Kinds of proxy servers Comparison of proxy-based firewalls Slide 51
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