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overflow exploits, SQL injection attempts, and cross-site scripting attacks Decisions are made based on address pairs, application content (for instance, URLs), and application data, such as commands passed within FTP or SMTP command channels Few vendors provide application-aware firewalls capable of managing RDP or ICA traffic, and enhancements to RDP or ICA require a revision of the firewall source code One notable exception is the Citrix Application Firewall As of this writing, the Citrix Application Firewall is the industry leader in application firewall performance Firewalls for Application Delivery Infrastructure Packet-filtering firewall systems, in conjunction with an application firewall, are strongly recommended for Application Delivery Platforms Industry leaders in firewall technology include Cisco Systems (ASA), CheckPoint (NG/NGX), Fortinet (FortiGate), and Citrix (Application Firewall) The firewall system, as shown in Figure 6-6, should include a perimeter router capable of static or dynamic packet filtering (to offload simple filtering and protect the firewall from
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Figure 6-6 The basic enterprise firewall system
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direct attack), a packet-filtering firewall element using stateful inspection, an application firewall, and an interior router capable of static or dynamic packet filtering Enhancements to ICA since the early MetaFrame versions eliminate the need for firewalls to support UDP pass-through for ICA browser services (UDP port 1604) Stateful inspection firewalls must approximate a session state for UDP by using timers because UDP is a stateless protocol XenApp now supports TCP-based XML services in lieu of ICA browser services
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Using the Internet as part of the corporate WAN infrastructure has obvious security implications The Internet is a public network, and as such it exposes an enterprise s private information to unauthorized individuals by its very nature The Internet is often an integral part of delivering applications to remote users in a server-based computing network, however Internet delivery provides virtually universal access to clients, built-in resiliency, and dramatic cost reductions as compared to dedicated media There are two basic encrypted transport methodologies used for Application Delivery Infrastructure network connectivity: virtual private networks (VPNs) and Public Key Infrastructure (PKI) encryption via Secure Sockets Layer (SSL) or Transport Layer Security (TLS) Encryption Standards Encryption standards define both the mechanics of the encryption process and the complexity of the key For all at-risk data transmissions (anything traversing the Internet), strong encryption should always be used For SSL/TLS, use a minimum 128-bit key (RC4 with 128-bit encryption and MD5 message authentication, yielding 34 1038 possible key values) If security is paramount, consider Triple-DES (3DES with 168-bit key and SHA-1 message authentication yields 37 1050 possible key values) or step up to AES (where AES-128 offers 34 1038 possible 128-bit keys, AES-192 affords 62 1057 possible 192-bit keys, and AES-256 provides 11 1077 possible 256-bit keys) When SSL is used, avoid SSL 20 implementations and instead use SSL 30 or TLS There are two basic types of encryption algorithms: symmetric (or private key) and public key Private key encryption requires that the same key used to encrypt the data be used to decrypt the data This is most commonly seen in VPN configurations The advantage is speed, because less computation is involved than in other methods The main disadvantage is that the key must be distributed to the intended recipient through some secure mechanism; the symmetric algorithm itself provides no way to distribute the key The second type of algorithm, the public key, calculates a list of keys, some of which can only encrypt the data and some of which can only decrypt the data The encryption key is the public key, and the decryption key is the private key A message encrypted with the former can only be decrypted by the latter A major advantage of this scheme is that the encryption key can travel in the open without compromising security Having the public key will not allow someone to decrypt the data NOTE: In some applications, such as Secure Socket Layer (SSL), the public key is made freely available to any client requesting it The client machine uses the public key to encrypt the data before sending it over the unprotected network Only the possessor of the private key will be able to decrypt it This is how e-commerce sites can function: Any customer who comes to the site can obtain the public key without any special arrangement or mechanism
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