Set Up Kerberos Authentication

Kerberos is a computer network authentication protocol that works on the basis of
tickets
to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner.
  1. Create a server profile.
    The server profile identifies the external authentication service and instructs the firewall how to connect to that authentication service and access the authentication credentials for your users.
    1. Select
      Device
      Server Profiles
      and select the
      Kerberos
      profile.
    2. Click
      Add
      and enter a Profile
      Name
      , such as GP-User-Auth.
    3. If this profile is for a firewall with multiple virtual systems capability, select a virtual system or
      Shared
      as the Location where the profile is available.
    4. Click
      Add
      in the Servers section and then enter the necessary information for connecting to the authentication server, including the server
      Name
      , IP address or FQDN of the
      Server
      , and
      Port
      .
    5. Click
      OK
      to save the server profile.
  2. (
    Optional
    ) Create an authentication profile.
    The authentication profile specifies the server profile for the portal or gateways to use when they authenticate users. On a portal or gateway, you can assign one or more authentication profiles in one or more
    client authentication
    profiles. For descriptions of how an authentication profile within a client authentication profile supports granular user authentication, see Configure a GlobalProtect Gateway and Set Up Access to the GlobalProtect Portal.
    To enable users to connect and change their own expired passwords without administrative intervention, consider using a pre-logon connect method. See Remote Access VPN with Pre-Logon for details.
    1. Select
      Device
      Authentication Profile
      and
      Add
      a new profile.
    2. Enter a
      Name
      for the profile and then select
      Kerberos
      as the authentication
      Type
      .
    3. Select the Kerberos authentication
      Server Profile
      that you created in 1 from the drop-down.
    4. Specify the domain name and username format. The device combines the
      User Domain
      and
      Username Modifier
      values to modify the domain/username string that a user enters during login. The device uses the modified string for authentication and uses the
      User Domain
      value for User-ID group mapping. Modifying user input is useful when the authentication service requires domain/username strings in a particular format and you don’t want to rely on users to correctly enter the domain. You can select from the following options:
      • To send only the unmodified user input, leave the
        User Domain
        blank (the default) and set the
        Username Modifier
        to the variable
        %USERINPUT%
        (the default).
      • To prepend a domain to the user input, enter a
        User Domain
        and set the
        Username Modifier
        to
        %USERDOMAIN%\%USERINPUT%
        .
      • To append a domain to the user input, enter a
        User Domain
        and set the
        Username Modifier
        to
        %USERINPUT%@%USERDOMAIN%
        .
      If the
      Username Modifier
      includes the
      %USERDOMAIN%
      variable, the
      User Domain
      value replaces any domain string that the user enters. If the
      User Domain
      is blank, that means the device removes any user-entered domain string.
    5. Configure Kerberos single sign-on (SSO) if your network supports it:
      • Enter the
        Kerberos Realm
        (up to 127 characters). This is the hostname portion of the user login name. For example, the user account name user@EXAMPLE.LOCAL has the realm EXAMPLE.LOCAL.
      • Specify a
        Kerberos Keytab
        file: click the
        Import
        link,
        Browse
        to the keytab file, and click
        OK
        . During authentication, the endpoint first tries to use the keytab to establish SSO. If it succeeds, and the user attempting access is in the
        Allow List
        , authentication succeeds immediately. Otherwise, the authentication process falls back to manual (username/password) authentication of the specified
        Type
        . The
        Type
        doesn’t have to be Kerberos. To change this behavior so that users can authenticate only using Kerberos, set
        Use Default Authentication on Kerberos Authentication Failure
        to
        No
        in a GlobalProtect portal agent configuration.
    6. Select the
      Advanced
      tab.
    7. In the Allow List,
      Add
      and then select the users and groups that are allowed to authenticate with this profile. Selecting the predefined
      all
      option allows every user to authenticate. By default, the list has no entries, which means no users can authenticate.
  3. Save your changes and commit the configuration.
    Click
    OK
    , and then
    Commit
    .

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