Configuring the Administration Tool to Use Kerberos Authentication

Besides configuring the Kerberos authentication in the Virtual DataPort server, you have to do it in all its clients that want to login using Kerberos.

This section explains how to configure the Administration Tool to use Kerberos authentication.

To enable Kerberos for JDBC clients, read the section Connecting to Virtual DataPort Using Kerberos Authentication of the Developer Guide.

To enable Kerberos for ODBC clients, enable Kerberos authentication on the databases that you are going to access from ODBC clients. The section Creating Databases explains how to do this.

The section Web Services Authentication provides information about the Kerberos authentication in Web services published by Virtual DataPort.

To configure the Administration Tool, click the menu Tools > Admin Tool preferences.

Setting up Kerberos authentication in the Administration Tool

Setting up Kerberos authentication in the Administration Tool

In this wizard, provide the following details:

  1. Select Kerberos authentication. If in the future, you want this Administration Tool to use the authentication configured in the database, select Standard authentication.

    If you select “Standard authentication”, you will rely on the other authentication methods provided by Virtual DataPort. I.e. you have to provide the credentials of a user created in Virtual DataPort or if you are connecting to a database with LDAP authentication, the credentials of a user in the LDAP directory selected for this database.

  2. Leave the Kerberos configuration file box empty unless the host where this Tool runs does not belong to a Kerberos realm (e.g. a Windows Active Directory domain) or it is a different domain than the one used by the Server. If you need to, click Browse to select the path to the file krb5.conf or krb5.ini.

  3. Select the authentication mode:

    1. Use Single Sign-On with system ticket cache: with this option, when you launch this Administration Tool, you will not need to enter your credentials. Instead, the Administration Tool will retrieve the Kerberos ticket from the tickets cache of the operating system. Then, it will automatically connect to the default database, which is configured in the “Server URI” box.


      If the Administration Tool runs on Windows, you can only use this authentication mode if you modify the Windows registry as explained in the section Modifying the Windows Registry to Use the Native Ticket Cache of the Installation Guide.

      If you cannot do this, use the “Use user/password” or the “Use ticket cache” options.

      On Linux, you can use this option without doing any changes on the system.

    2. Use user/password (recommended option if you cannot use the first one): the users will have to provide their credentials to log in. The tool will connect to the Active Directory to request a Kerberos ticket on their behalf and use it to authenticate.

    3. Use ticket cache: select this to use your own ticket cache instead of the one from the operating system.

      We recommend using the option Use user/password over this one because with this one, there is a limit of how long the administration tool can renew the Kerberos ticket of the ticket cache. Usually, after a week, these tickets can no longer be renewed and you will have to obtain it again.

      To use this option, before starting the Tool, you need to manually request a Kerberos ticket-granting ticket (TGT). To do this, execute the following:

      <DENODO_HOME>\jre\bin\kinit.exe -f -c "<DENODO_HOME>\conf\vdp-admin\ticket_cache"

      You will also have to run this when the ticket has expired.

      The option -f requests the Active Directory to return a “forwardable” ticket. “Forwardable” tickets can be used by the other applications (in this case, the Virtual DataPort server) to request service tickets on behalf of the user. These service tickets will be used to perform Kerberos requests to other services (e.g. databases) on behalf of the Virtual DataPort client (i.e. the Administration Tool, JDBC clients and ODBC clients).

      If the ticket used by the client is not forwardable, the requests that involve data sources with the option “pass-through session credentials” enabled, will fail.

      1. After creating the ticket cache file, enter the path to this file in the Ticket cache file box.

      2. If the tickets cache contains “ticket-granting tickets” for several users or domains, enter the user name that you want to use for the authentication in the Principal box.

      3. Select Renew TGT so when the ticket expires but still is within the renewal period, a new ticket will be obtained. The renewal period is configured in the Active Directory.

      If you were using this authentication method and switch to another one, remove the ticket cache file.

    4. Use keytab: we discourage using it because this method is usually used by servers, not for regular users. You only need to enter the Principal if the keytab contains entries for several users.

  1. The first time you set up Kerberos, we recommend selecting the check box Activate Kerberos debug mode in case you run into any issues. Once Kerberos has been set up, disable this.

    If the administration tool has the update 20190903 or newer:

    To obtain the Kerberos debug messages with the update 20190903 or newer, in the installation of your administration tool - not in the Denodo server - open the file <DENODO_HOME>/conf/vdp-admin/log4j2.xml and add the following below the line <Loggers>:

    <Logger name="com.denodo.util.logging.JavaConsoleLogging" level="debug" />

    Restart the administration tool to apply the changes to this file.

    You will find the Kerberos debug messages in the local file <DENODO_HOME>/logs/vdp-admin/vdp-admin.log.

    If the administration tool has the update 20190312 or older:

    To obtain the Kerberos debug messages with the update 20190312 or older, launch the administration tool from the command line and redirect the output to a file. To do this, execute these commands:

    On Windows:

    cd <DENODO_HOME>\bin
    vdpadmin.bat > vdpadmin_kerberos_logging.log 2>&1

    On Linux:

    cd <DENODO_HOME>/bin
    ./ > vdpadmin_kerberos_logging.log 2>&1

    You will find the Kerberos debug messages in the local file <DENODO_HOME>/bin/vdpadmin_kerberos_logging.log.

    When you disable the Kerberos debug mode, you no longer need to start the administration tool from the command line.

  2. If you selected the Authentication modes Use Single Sign-On with system ticket cache, Use ticket cache or Use keytab, the next time you launch the Administration Tool of this host, it will automatically log in to the Server indicated in Server URI.

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