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Safeguard Authentication Services 5.1.1 - Administration Guide

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Uninstalling a group managed service account (gMSA)

To uninstall a gMSA, follow the steps.

NOTE: To uninstall a gMSA, you can also use the following command that Authentication Services provides:

sudo vastool service gmsa uninstall gmsaExample

For more information, see man vastool.

To uninstall a gMSA

  1. Remove the keytab file.

  2. Remove the line of the account from the "/etc/opt/quest/vas/gmsa.ktlist" config file.

Supporting legacy LDAP applications

The Safeguard Authentication Services daemon, vasproxyd, provides a way for applications that use LDAP bind to authenticate users to Active Directory without using secure LDAP (LDAPS). Instead of sending LDAP traffic directly to Active Directory domain controllers, you can configure applications to send plain text LDAP traffic to vasproxyd by means of the loopback interface. vasproxyd proxies these requests to Active Directory using Kerberos as the security mechanism.

vasproxyd provides the following features:

  • Secure LDAP authentication without SSL

    LDAP is designed as a data access protocol. The use of LDAP as an authentication mechanism introduces important security considerations—especially since most applications are only able to produce simple bind credentials. vasproxyd allows applications to use LDAP simple bind securely by generating the appropriate Kerberos authentication traffic. The use of Kerberos eliminates the need for public key cryptography while providing a high level of security.

  • Authenticated anonymous searches

    Many applications require the use of anonymous LDAP searches. vasproxyd allows you to specify a service account that can authenticate and proxy anonymous queries so that applications that expect to be able to use anonymous LDAP can operate with Active Directory without requiring modification of Active Directory to allow anonymous queries.

  • allow/deny authorization

    vasproxyd allows you to add an additional layer of application authorization based on Active Directory user name, Active Directory group membership, or Active Directory Organizational Unit (OU) containership. In other words, vasproxyd returns an LDAP BindResponse error on an (otherwise valid) LDAP bind attempt if the authenticating user is not authorized by means of settings in the users.allow/ users.deny files.

Installing the LDAP proxy

You can install the LDAP proxy package using the install.sh script.

To install the LDAP proxy

  1. Insert the Safeguard Authentication Services distribution media and navigate to the root directory of the installation media.
  2. Run the following command as root: 
    ./install.sh vasproxy
  3. Follow the prompts to complete the installation.

Configuring the LDAP proxy

The LDAP proxy must be configured for each application that will use it. LDAP proxy configuration is stored in the [vasproxyd] section of vas.conf. Each setting in the [vasproxyd] section specifies a proxy handler configured to listen on a specific local port for LDAP traffic.

To configure the LDAP proxy for an application

  1. Open vas.conf and add a proxy handler for your legacy application. A proxy handler is a multi-valued setting. For example: 
    [vasproxyd] 
mydomain = { 
   listen-addrs = 127.0.0.1:10000 
   enable-anonymous = true 
   service-principal = mydomain.example.com@EXAMPLE.COM 
   allow-deny-name = mydomain 
   daemon-user = mydomain 
   connection-timeout = 120 
   largest-ldap-message = 2000000 
   }

    This example configures a proxy handler for the mydomain application. The name is only used for identification in log files. It does not have to match the name of the application. This proxy handler listens on the localhost port 10000.

    For a complete list of all proxy handler options and their meanings, see the vasproxyd man page. After you set up the proxy, you may need to adjust the legacy application configuration to use the proxy address and port.

  2. After you have configured the LDAP proxy handler, restart the service. The method for restarting the service differs by platform:

    Linux and Oracle Solaris:

    /etc/init.d/vasproxyd restart

    HPUX:

    /sbin/init.d/vasproxyd restart

    AIX:

    stopsrc -s vasproxyd startsrc -s vasproxyd
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