This article walks through the configurations for controlling which privileged accounts users can see in the Centrify Admin Portal. A common use case would be to grant developers or third party vendors access to the privileged accounts they are only allowed to use.

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This article walks through the configurations for controlling which server(s) or network appliance(s) users can see in the Centrify Admin Portal's list of Systems. A common use case would be to grant developers or third party vendors access to only the system(s) they are allowed to see, and without exposing all the other system names in your environment.

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This article will show you how Centrify can enable Linux to accept Google credentails for login, without having to add users locally. 

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Working With Keytabs

By Centrify Contributor II on ‎07-09-2018 02:10 PM

Learn the basics of Kerberos and how keytabs can be created, with examples for common scenarios.

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How to:
Centrify provides the following scripts to enable/disable debug logging:

  • Centrify Agent for Linux:  /usr/share/centrifycc/bin/cdebug
  • DirectControl:  /usr/share/centrifydc/bin/addebug
  • DirectAudit: /usr/sbin/dadabug

Enable debugging in journald environment

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Do you want to give an individual remote access without giving it to all users then this blog is for you!

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Multi-factor authentication (MFA) at OS login provides an extra layer of protection and helps to meet compliance for regulations such as PCI DSS 3.2, NIST 800-171, 23 NYCRR 500, and more. Centrify enables the ability to prompt for MFA at console or ssh login. This article will walk you through the steps to enable users to log into Linux and UNIX systems with Active Directory credentials and prompted for multi-factor authentication.

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Before you join a computer to AD, there are three things to check:

  • DNS settings
  • Computer name
  • Network communication between the Linux/UNIX system and Active Directory domain controller(s)
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[How to] Force Kerberos SSH Authentication, and Disable SSH Public Key Authentication

By Centrify on ‎03-26-2018 12:31 PM - last edited ‎04-04-2018 02:18 PM

Joining Linux and UNIX machines to an Active Directory domain with Centrify Infrastructure Services has countless benefits, not the least of which is the ability to do away with SSH Public Key authentication. There are several good reasons to discontinue the use of SSH Keys. For a complete list of all of them, please reference the NIST Internal Report 7966.

 

I can save you some dry reading, and summarize it like this. If improperly managed, the use of SSH Keys can present a massive security risk. Even if every measure is taken to properly manage them, SSH key provisioning is still prone to human error, and after all, UNIX admins are only human.

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Using the adlicense command to change/fix the license type on Linux desktops and (possibly) correct License Reports within Centrify Infrastructure Services.

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Centrify Infrastructure Services 2017.3 - Support for Centrify Analytics

 analytics.png

 

 

This is part of a series of articles showcasing what's new with Centrify Infrastructure Services (formerly Centrify Server Suite) version 2017.3.  In this article, we'll preview Centrify Analytics for Infrastructure Services Alpha.

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All those commands you wish you had known when you first installed the DirectAudit agent.

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Encrypting cache in adclient

By Centrify ‎12-29-2017 02:20 PM

How to enable adclient cache encrypting and some things to consider if you're thinking about making this change.

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Many Ways to Install Centrify Linux Agent

By Centrify on ‎12-27-2017 08:29 AM - last edited ‎09-11-2018 01:31 PM

One of the great things about Centrify approach to deploying agents, is that Centrify’s approach provides multiple options to install a Centrify agent onto a Linux or UNIX computer. While enterprises are welcome to use popular software deployment tools such as Chef, Puppet, and Ansible to deploy Centrify agents, Centrify intrinsically offers great flexibility to deploy agents as well.

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Various security standards require the computer screen to be locked or logged off after a period of inactivity. This article will show you how to use Centrify to enforce an automatic log out from the Linux CLI after a period of inactivity.

 

Requirements:

  • The Linux system must have the Centrify Agent installed and bound to Active Directory.
  • You will need Group Policy Management on a Windows member server with the Centrify Infrastructure Services installed.

 

1. In Group Policy Management, edit or create a GPO for your Linux system.

2. Enable Computer Configuration > Policies > Centrify Settings > Common UNIX Settings > Specify commands to run 

Unix.png

 

 

2. Click Add.

timeoutscript.png

 

3. Enter a custom command, then click OK.

enterscript.png

 

For CentOS use:

grep -q -F TMOUT=900 /etc/bashrc || echo TMOUT=900 >> /etc/bashrc

 

For Ubuntu use:

grep -q -F TMOUT=900 /etc/bash.bashrc || echo TMOUT=900 >> /etc/bash.bashrc

 

Change the numbers in the command to your desired number in seconds. (For example, 900 = 15 minutes.) Please note the operating system might round up or down to the closest supported minute. 

 

4. Reboot the Linux system for the setting to apply.

 

The Centrify Agent will execute the script at every Active Directory group policy interval (default 90 minutes). 

 

 Please share if you have a better script or method.

 

Other related articles

 

AD Bridging & Kerberos vs PuTTY-CAC

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Centrify provides secure access to servers without exposing the password for shared privileged accounts such as root, (domain) administrator, or service accounts. By default, Centrify opens a secure shell or remote desktop session to the target system through the web browser. If you are connecting from inside the network,  you can configure Centrify to use the native SSH or RDP client instead of the browser. For instructions to set this up in Centrify, go to: https://docs.centrify.com/en/centrify/adminref/index.html?version=1504972139#page/cloudhelp%2Fsvr_mg...

 

To complete this configuration for SSH this article will show you how to configure the Windows Path to locate the desired SSH client to use. Setting the path and environment variables will differ depending on the version of Windows you have on your computer. Administrator privileges are usually required to modify the path and environmental variables.

 

Windows 8 and Windows 10

  1. From the Desktop, right-click the very bottom left corner of the screen to get the Power User Task Menu.
  2. From the Power User Task Menu, click System.
     Powertaskmenu.png
  3. Click the Advanced System Settings link in the left column. Note: In Windows 10, you may need to scroll down to the Related settings section and click the System info link. In the System window that opens, click the Advanced system settings link in the left column.
  4. In the System Properties window, click on the Advanced tab, then click the Environment Variables button near the bottom of that tab.
  5. In the Environment Variables window (pictured below), highlight the Path variable in the "System variables" section and click the Edit button. Modify the path line by appending the path to the SSH client to the end. Each different directory is separated with a semicolon as shown below. See the example below in red.

C:\Windows\System32;C:\Windows;C:\Program Files;C:\Program Files (x86)\Centrify\Centrify PuTTY\

 

windowspath.png

 

Windows 7, Windows Server 2008 and Windows Server 2012

  1. From the Desktop, right-click the Computer icon and select Properties. (For Windows Server 2012 and up, right-click on the icon labeled This PC.) If you don't have a Computer icon on your desktop, click the Start button, right-click the Computer or This PC option in the Start Menu, and select Properties
  2. Click the Advanced System Settings link in the left column.
  3. In the System Properties window, click on the Advanced tab, then click the Environment Variables button near the bottom of that tab.
  4. In the Environment Variables window (pictured below), highlight the Path variable in the "System variables" section and click the Edit button. Modify the path line by appending the path to the SSH client to the end. Each different directory is separated with a semicolon as shown below. See the example below in red.

    C:\Windows\System32;C:\Windows;C:\Program Files;C:\Program Files (x86)\Centrify\Centrify PuTTY\

windowspath.png

 

 

To capture configuration changes in Centrify Access Manager to your SIEM, you will need two things on the operating system running Access Manager 

1. Your SIEM reflector to read and send the Application event viewer to your SIEM.

2. Configure the following registry setting:

CSSaudittrail.png

- HKLM\Software\Centrify\AuditTrail\Centrify Suite.Centrify Configuration\AuditTrailTargets (Set the value to 3.)

- OR HKLM\Software\Centrify\AuditTrail\AuditTrailTargets  (Set the value to 3.) Then delete the three child keys for HKLM\Software\Centrify\AuditTrail.

 

This value will write events both to the local Application event log and Direct Audit database. Events such as assigning a user to a role, creating a child zone or modifying a user's POSIX information will be logged to your SIEM.

 

For reference, here is the guide for all events written to the Application event log as well the syslog on Linux by the DirectAudit Agent. https://docs.centrify.com/en/css/suite2017.1/centrify-audit-events-guide.pdf

Your Centrify Privilege Service (CPS) deployment could go a lot smoother with this checklist. This checklist is a high overview of the necesarry tasks to prepare, deploy, configure, and validate a CPS environment.

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Getting Kerberos Tickets For Your Second AD Account On Your Smart Card

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There are many occasions where a Centrify administrator needs to change UNIX Data on a specific Centrify Zone, specially when the Zone Provisioning Agent is not enabled. For example, a Centrify admin might need to change the shell for many users at the same time. If you have a lot of users in your UNIX Data / Users folder, this could be time consuming.

 

You can use adedit to achieve this. Continue reading...

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So you're already managing user accounts in Active Directory - but what about those pesky system accounts you're still managing in /etc/passwd?  Wouldn't it be great to manage them with Centrify too?  In this article we'll demonstrate how to securely manage local accounts using a comination of Centrify Server Suite and Centrify Privilege Service.  

 

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Centrify Server Suite 2017's new Advanced Monitoring functionality preserves "identity context" even after the user "sudo's to root".

 

The new “advanced monitoring” feature adds three new functionalities:

  • Generate audit trail events when specific programs are executed by any user.
  • Generate audit trail events when any file in the directories /etc, /var/centrifyda and /var/centrifydc is modified by a non-root user.
  • Get history of programs executed in an audited session, including programs that are executed by scripts.
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This article describes an approach to integrating Centrify Server Suite for UNIX with a third-party MFA solution. We'll focus on PingID MFA from Ping Identity as our example.  The key points this article conveys are:

  1. The recommended approach  to implement a third-party MFA with Centrify Server Suite is through Centrify Identity Service. Whenever a CSS MFA policy is triggered, CSS UNIX agent calls into CIS which in turn brokers the request to the third-party MFA;
  2. For customers that don’t want to implement CIS to enable third-party MFA for their Unix systems, it is technically possible to configure a third-party MFA PAM module with the CSS UNIX agent without relying on Centrify Identity Service. However, there are several technical dependencies need to consider. Section 4 addresses some of the risks and issues with this approach.
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Many federal IT departments are being told to provide 2-factor authentication not only for all logins, but also for all privilege elevations, including the launching of critical applications. Here’s how Centrify can help.

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The Centrify Community has some great resources when it comes to IBM DB2 integration with Active Directory using Centrify. But, have you ever wanted to quickly set up DB2 in a test environment to play with these integrations? By following this article, you can!

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Want to know how to migrate your UNIX profiles from an existing AD Bridging solution or LDAP to Centrify Server Suite for UNIX/Linux?  These steps will who you how to leverage your existing unix profiles and migrate to Centrify from other centalized solutions with minimal impact to your environment and processes.

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Support has helped multiple customers who are trying to meet the challenges posed by the badlock vulnerability in samba while also learning about how to move to Centrify's new adbindproxy component.  This article is based on our recent experience helping customers migrate in hopes it will help other customers who are seeking similar guidance.

 

The following information applies to Red Hat Linux. If you are using a different operating system, please recognize that some of the commands may differ somewhat.

 

Let’s log into a Linux machine that is joined to a Centrify zone and has Centrify-enabled samba on it. Once logged in, let’s check the shares on the machine by running smbclient at the command prompt.

1.png

After verifying the correct shares are listed, let’s backup the samba configuration file:

 

dzdo cp /etc/samba/smb.conf /etc/samba/smb.conf.bak

 

We’re now ready to uninstall the Centrify-enabled samba installation form the machine using the rpm command:

 

dzdo rpm –e CentrifyDC-samba   (This is case sensitive)

 

And then verify it was removed:

 

dzdo rpm –qa | grep –i Centrify

 

Ensure nothing for Centrify samba is listed. We’ll then want to remove any stock samba 3 installations. We will first search for them:

 

dzdo rpm –qa | grep samba

 

If any show up, we’ll then want to remove the packages with the yum command:

 

dzdo yum remove samba*

Enter a y to remove when prompted.

 

We’re now ready to install samba 4, again utilizing the yum command:

 

dzdo yum install samba4*

When prompted, enter a y to install.

 

We should then verify installation:

 

dzdo rpm –qa | grep samba

2.png

As long as the installation is listed, we are ready to move the backed up samba config file into place in order to utilize all of our previous samba settings:

 

dzdo cp /etc/samba/smb.conf.bak /etc/samba/smb.conf

 

 

You can check the date stamp to ensure the smb.conf file is the one we just copied into place.

If you’d like to verify the share files are still showing correctly, please run testparm at the command prompt. The shares should show.

3.png

We’re now ready to download and install Centrify’s adbindproxy. Please open a browser and navigate to www.centrify.com and then go to Support and then Download Center and use your Support Portal login to log into the site. Once logged in, please go to “Tools and Troubleshooting” and find “Integration with Samba”. It will then show a list of the different operating systems. Please select the TGZ button next to the line that matches your operating system and download the file.

4.png

4-1.png 

 

Once the download completes, please copy or move the file to the *nix machine. You can make a directory on the Linux machine where you’d like to untar the tgz file:

 

mkdir /tmp/adbindproxy

 

You can then navigate to the directory where the tgz file is located and untar it:

 

mv centrify-adbindproxy……..tgz /tmp/adbindproxy/

cd /etc/adbindproxy

tar –xvf centrify-adbindproxy…….tgz

5.png

We’ll then install adbindproxy with the rpm command:

 

dzdo rpm –Uvh centrify-adbindproxy…….rpm

6.png

After the installation is complete, we’ll want to run the configuration script for adbindproxy and we’ll mostly be taking the defaults in the script with a few exceptions:

 

dzdo /usr/share/centrifydc/bin/adbindproxy.pl

 

One of the prompts will ask if you want to join the machine to a zone, if it’s already joined, you can jess press enter. If you need to join it to a zone, you can enter the zone name here and press enter.

 

The next prompt you want to watch for is the one that says:

 

Please specify the stock samba winbind listen path(dir)if it is not in [/run/samba/winbindd]:

RHEL 6 often uses /var/run/samba/winbindd for its winbindd listen path so you’ll want to verify the winbindd path and change it here if necessary. If it uses the default path, you can just press enter.

 

You should just be able to take the defaults through the rest of the script but you may want to read them to verify they are correct before pressing enter.

After the script completes, the samba services, smbd, nmbd, winbindd and adbindd, will need to be restarted. Centrify has a built in command for restarting all four services so that they don’t have to be restarted one at a time. At the command prompt, please run:

 

dzdo service centrifydc-samba restart

 

You’ll be able to verify the services are starting OK at this point.

 

We’ll want to add this setting to chkconfig to ensure this command runs if the server is ever rebooted. We can do that by running the following command:

 

dzdo chkconfig --add centrifydc-samba

 

We then need to start this chkconfig process:

 

dzdo chkconfig centrifydc-samba

 

And then verify it started correctly for the run levels that are necessary:

 

dzdo chkconfig --list centrifydc-samba

 

We’re ready to verify the samba version installed:

 

smdb –V

7.png

We can also verify we see the Linux shares:

 

smbclient -L //localhost

8.png

And then connectivity to the shares:

 

smbclient //localhost/sharename

 

It will go to a prompt that looks like smb:\> where you can type in ls and the shares should be listed.

9.png

You may also want to go to a Windows machine and verify you can get to the shares from there. If you go to Windows Explorer and, in the address window, type in \\servername\sharename, you should see the contents of the share.

10.png

You’re all set. You are now running on stock samba with Centrify’s adbindproxy in place to help integrate samba with Centrify.

 

Centrify has some additional resources on this subject if you’re interested.

There’s a Samba Integration Guide that came with the adbindproxy download and can be found in the directory where we untarred the tgz file. You can also get this documentation from the Centrify website by going to:

 

https://docs.centrify.com/en/cs/suite2016/centrify-adbindproxy-guide.pdf

 

There is also a video that goes over the process step by step that you can view below.

 

  

There are also some knowledge-base articles that are helpful with this process. You can find them in the community section of the website. Links to these KBs are listed below.


Links:

https://centrify.force.com/support/Article/KB-6842-Overview-of-the-steps-to-upgrade-or-migrate-from-...

https://centrify.force.com/support/Article/KB-6834-Additional-configuration-steps-for-deploying-Adbi...

https://centrify.force.com/support/Article/KB-6731-Impact-of-Badlock-CVE-2016-0128-CVE-2016-2118-on-...

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