Fortinet What is Extended Authentication (XAuth) and How It Works in VPNs

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VPN authentication

Configuring authenticated access

Configuring XAuth authentication

Extended Authentication (XAuth) increases security by requiring additional user authentication in a separate exchange at the end of the VPN Phase 1 negotiation. The FortiGate unit challenges the user for a user name and password. It then forwards the user credentials to an external RADIUS or LDAP server for verification.

XAuth can be used in addition to or in place of IPSec phase 1 peer options to provide access security through an LDAP or RADIUS authentication server. You must configure dialup users as members of a user group who are externally authenticated. None can have passwords stored on the FortiGate unit.

To configure authentication for a dialup IPSec VPN - web-based manager

1Configure the users who are permitted to use this VPN. Create a user group and add them to it.

For more information, see “Users/peers and user groups” on page 33.

2Go to VPN > IPSec > Auto Key (IKE), and enter the following information:

Figure 29: IPSec configuration for dialup users

	FortiOS v3.0 MR7 User Authentication User Guide
58	01-30007-0347-20080828

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Contents E R G U I D E FortiOS v3.0 MR7 User Authentication User Guide TrademarksContents Index Configuring authenticated accessUsers/peers and user groups Creating local users Creating peer usersAbout authentication IntroductionWeb-based user authentication User’s view of authenticationVPN client-based authentication FortiGate administrator’s view of authentication See Creating local users on See Creating peer users onAuthentication servers See Configuring user groups onUsers Public Key Infrastructure PKI authenticationPeers User groupsFirewall policies Authentication timeoutAbout this document VPN tunnelsFortiGate documentation Name field, type adminTypographic conventions FortiGate Administration Guide Related documentationFortiMail documentation FortiManager documentationFortiClient documentation FortiAnalyzer documentationFortinet Knowledge Center Customer service and technical supportFortinet Tools and Documentation CD Comments on Fortinet technical documentationAuthentication servers Radius serversConfiguring the FortiGate unit to use a Radius server Radius attributes sent in Radius accounting messagePrimary Server Name/IP Primary Server SecretEdit icon Edit a Radius server configuration GroupLdap servers Ldapsearch -x objectclass= Configuring the FortiGate unit to use an Ldap server Common Name PasswordServer Port IdentifierProtocol To configure the FortiGate unit for Ldap authentication CLIEdit CertificateUsing the Query icon Ldap server Distinguished Name Query treeTACACS+ servers AsciiAuthentication Type Server KeyDirectory Service servers Groups Create NewDomain Fsae Collector IPDirectory Service server configuration Name Fsae Collector IP/Name PortCLI Example Directory Service server list Directory Service servers Users/peers and user groups Users/peersCreating local users User type AuthenticationTo create a local user web-based manager Go to User Local Delete icon Edit icon To view a list of all local users, go to User LocalTo create a local user CLI Creating peer users To remove a user from the FortiGate unit configuration CLIDelete icon To view a list of PKI peer users, go to User PKI Authenticating peer userSubject To create a peer user for PKI authentication CLI Remove PKI peer userUser groups Directory Service user groupsFirewall user groups SSL VPN user groups Protection profilesSelect Create New and enter the following information Configuring user groupsFirewall Members Configuring Directory Service user groupsTo create a firewall user group CLI FortiGuard WebConfiguring SSL VPN user groups Available Users/Groups or Available MembersTo create a peer group CLI Configuring Peer user groupsViewing a list of user groups Group NameConfig user group delete groupname End User groups Enter the Idle Timeout value seconds Select Apply Authentication timeoutAuthentication protocols TelnetFirewall policy authentication Authentication SettingsTo configure authentication for a firewall policy Configuring authentication for a firewall policyAuthentication is an Advanced firewall option Go to Firewall PolicyFirewall policy order Firewall Policy Move ToSource Interface Configuring authenticated access to the InternetZone Select Enable SSL-VPN and enter information as follows VPN authenticationConfiguring authentication of SSL VPN users Go to VPN SSLRequire Client Certificate Default RC4128Server Certificate Encryption Key AlgorithmTo configure authentication for an SSL VPN CLI Select Enable Pptp Configuring authentication of VPN peers and clientsConfiguring authentication of Pptp VPN users/user groups Select Require Client Certificate, and then select ApplyTo configure authentication for a Pptp VPN CLI Configuring authentication of L2TP VPN users/user groupsConfiguring authentication of remote IPSec VPN users To configure authentication for an L2TP VPN CLIOnly users with passwords on the FortiGate unit To configure user group authentication for dialup IPSec CLIRemote Gateway Configuring XAuth authentication IPSec configuration for dialup usersXAuth To configure authentication for a dialup IPSec VPN CLIRemote Gateway Authentication Method Server TypeVPN authentication Index 01-30007-0347-20080731 MS-CHAP VSA