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Several encryption algorithm and transport standards have arisen that have been adopted by Microsoft, Citrix, and others Understanding them will allow an administrator to judge for themselves whether a specific standard is appropriate for their server-based computing project By implementing an encryption algorithm and transport method in the network backbone, the task of authenticating and securing the network session is made further transparent to the end user Cisco, Nortel, and other vendors facilitate this seamless authentication by their adoption of one or more security standards Encryption for Application Delivery Infrastructures Both ICA and RDP support basic encryption services through their respective client and server configurations RDP generally requires what many enterprise security administrators consider to be a nonstandard port (TCP 3389) to be open through the firewall, and does not support authentication prior to connecting to the target server (secure application proxy) ICA has variable levels of security, and can be encapsulated to operate on a standard port that is usually permitted through enterprise firewalls TCP 443 (HTTPS) By default, the ICA protocol adds little to the security already existing in Terminal Services ICA uses a very basic method to encrypt (or more accurately scramble ) the data stream by using a key It is really meant to help ensure that clear-text is not visible in the data stream When the 128-bit encryption option for ICA connections is invoked, the ICA session is encrypted with a 128-bit key RC5 encryption algorithm from RSA Data Security RC5 uses a combination of symmetric and public-private key algorithms The XenApp client and server use the Diffie-Hellman key agreement algorithm with a 1,024-bit key to generate RC5 keys Citrix bills this client as being safe enough to run sessions over the Internet, and indeed many companies use or base their products on the RC5 encryption algorithm Windows Server 2003 Remote Desktop Connection (RDC) services use 128bit, bidirectional RC4 encryption Windows Server 2003 (with the encryption module), Windows Server 2008, and Citrix XenApp are now certified as FIPS 140 compliant for use in federal government information systems In either case, the direct connection from client to target server creates additional concerns, even when passing through most stateful inspection firewalls The Citrix Access Gateway (shown in Figure 6-7) replaced the MetaFrame Secure Gateway and adds significant improvements in features, functionality, and security The Citrix Access Gateway (CAG) consolidates Secure Gateway onto a hardened-OS appliance form-factor and provides not only the SSL application proxy, but also a universal SSL VPN that transparently supports virtually all ports and protocols (including UDP-based Voice-Over-IP soft phones) When deployed with Advanced Access Control (AAC), the CAG provides real-time endpoint analysis to dynamically control which XenApp applications are accessible to remote users based on identity, source address, originating device security, and other factors Additionally, AAC can control access to application behavior per user session (for example, the right to view, edit, or print) based on the same endpoint analysis criteria The actual implementation (network and security architecture) of the Citrix Access Gateway and Web Interface components determine which transport connections are encrypted For design and deployment considerations for Citrix Access Gateway (CAG), see 11
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Figure 6-7 Citrix Access Gateway
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Authentication, Authorization, and Accounting (AAA) services provide the means to identify a user, grant access to specific resources, and document what the user did and when they did it The vast majority of AAA services in a Windows Server 2003 server environment are provided by the Windows security model with authentication in the form of user account/password settings, authorization provided by discretionary Access Control Lists (on files, shares, and other OS-controlled resources such as print services), and accounting provided through event logs and event-auditing policies Windows Server 2003 Terminal Services and XenApp 45 both support two-factor authentication (smart card) More robust authentication such as three-factor authentication requires third-party software TIP: In Windows Server 2003 and 2008, you can add users and groups directly to the Remote Desktop Users group to allow RDP or ICA access
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