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Painting ECC200 in VB.NET Lesson 3

Lesson 3
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Securing Remote Access
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One you have configured a Routing and Remote Access server to use RADIUS, RRAS transmits all authentication traffic to the RADIUS server for confirmation. The RADIUS server stores all the user accounts and passwords, as well as other account information. The real advantage of RADIUS is that you can run multiple remote access servers and configure them all to use a single RADIUS server for authentication. This way, remote users can access any remote access server, and you have to maintain only a single set of user accounts on the RADIUS server. Organizations that use RADIUS typically have large remote access installations, for example, ISPs. The Authentication Methods dialog box, shown in Figure 5-8, lists the authentication protocols that Windows Server 2003 RRAS supports. The characteristics of the authen tication protocols are as follows:
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Figure 5-8
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The RRAS Authentication Methods dialog box
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Extensible Authentication Protocol (EAP) An open-ended system that allows RRAS to use third-party authentication protocols as well as those supplied with Windows Server 2003. To use EAP, you select the Extensible Authentication Proto col (EAP) check box in the Authentication Methods dialog box and then click EAP Methods to display the EAP Methods dialog box. This dialog box contains a list of the EAP methods currently installed on the system. EAP is the only authentication protocol supported by Windows Server 2003 RRAS that enables you to use mech anisms other than passwords (such as digital certificates stored on smart cards) to
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5
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Using Routing and Remote Access
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verify a user s identity. In addition to providing the infrastructure to support thirdparty authentication mechanisms, Windows Server 2003 RRAS supports the fol lowing EAP types:
Extensible Authentication Protocol Message Digest 5 Challenge Handshake Authentication Protocol (EAP MD5 CHAP) Uses the same authentication mechanism as CHAP (explained later in this list), but packages the authenti cation messages in EAP packets Extensible Authentication Protocol Transport Level Security (EAP TLS) Required to authenticate remote access users with smart cards or other secu rity mechanisms based on certificates Protected EAP (PEAP) A password-based EAP type designed for wireless networks EAP RADIUS Not a true EAP type, but a mechanism that enables the Rout ing and Remote Access server to encapsulate EAP authentication messages in the RADIUS message formation and send them to a RADIUS server
Microsoft Encrypted Authentication Version 2 (MS-CHAP v2) A passwordbased authentication protocol that enables the client and the server to mutually authenticate each other using encrypted passwords. This makes it all but impossi ble for potential intruders to compromise passwords by capturing packets. Microsoft Challenge Handshake Authentication Protocol Version 2 (MS-CHAP v2) is the simplest and most secure option to use when your clients are running Microsoft Windows 98 or later. Microsoft Encrypted Authentication (MS-CHAP) An earlier version of the Microsoft Challenge Handshake Authentication Protocol (MS-CHAP) that uses oneway authentication and a single encryption key for transmitted and received messages. The security that MS-CHAP v1 provides is inferior to that of version 2, but RRAS includes it as well to support remote access clients running Windows 95 and Windows NT 3.51, which cannot use MS-CHAP v2. Encrypted Authentication (CHAP) A standard authentication protocol included in RRAS to support non-Microsoft remote access clients that cannot use MS-CHAP or EAP. Less secure than either version of MS-CHAP, Challenge Handshake Authentication Protocol (CHAP) requires access to users passwords, and by default, Windows Server 2003 does not store the passwords in a form that CHAP can use. To authenticate users with CHAP, you must open the group policy governing users and enable the Store Passwords Using Reversible Encryption password policy. Then you must have every user s password reset or changed, so that it is stored in the reversible form that CHAP can use. Shiva Password Authentication Protocol (SPAP) A relatively insecure authentication protocol designed for use with Shiva remote access products.
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