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Category: Security

Row-Level Security and UseRelationship

Published 2021-03-10 by Kevin Feasel

Teo Lachev points out an issue when combining row-level security with the USERELATIONSHIP() function in a Tabular model:

You’ve created a beautiful, wide-open Tabular model. You use USERELATIONSHIP() to switch relationships on and off. Everything works and everyone is pleased. Then RLS sneaks in, such as when external users need access, and you must secure on some dimension table. You create a role, specify a row filter, test the role, and get greeted with:

The UseRelationship() and CrossFilter() functions may not be used when querying ‘<dimension table>’ because it is constrained by row-level security defined on ‘<dimension table>’ or related tables.

Read on to learn what the issue is and one potential workaround.

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Testing Kafka with Kerberos and SSH

Published 2021-03-05 by Kevin Feasel

Daniel Osvath has a guide for us:

Kerberos authentication is widely used in today’s client/server applications; however getting started with Kerberos may be a daunting task if you don’t have prior experience. Information on setting up Kerberos with an SSH server and client on the web is fragmented and hasn’t been presented in a comprehensive end-to-end way on a simple local setup.

At Confluent, several of our connectors for Apache Kafka® support Kerberos-based authentication. For development and testing of these connectors, we often leverage containers due to their fast, iterative benefits. This tutorial aims to provide a simple setup for a Kerberos test environment with SSH for a passwordless authentication that uses Kerberos tickets. You may use this as a guide for testing the Kerberos functionality of SSH-based client-server applications in a local environment or as a hands-on tutorial if you’re new to Kerberos. To understand the basics of Kerberos before diving into this tutorial, you may find this video helpful. Additionally, if you are looking for a non-SSH-based setup, the setup below for the KDC server container may also be useful.

Click through for two approaches to the problem.

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Always Encrypted Setup

Published 2021-03-04 by Kevin Feasel

Chad Callihan takes us through an example of configuring Always Encrypted:

Always Encrypted can encrypt columns with deterministic encryption or randomized encryption. Your choice on which is better for you depends on how you plan to use the encrypted data. Deterministic encryption will produce the same encrypted value every time whereas randomized will not have the same encrypted value.

If you want to encrypt records but will also want to be querying encrypted records, you’ll want to choose deterministic for more efficient queries. Deterministic encryption will still allow point lookups, equality joins, grouping, and indexing when querying data.

Click through for the step-by-step process.

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Power BI Object Level Security

Published 2021-03-04 by Kevin Feasel

Gilbert Quevauvilliers shows us an example of Object Level Security in Power BI:

My example which I am going to detail below will show you how I will restrict a user from viewing sales data. The same user will be able to see Quantity amounts. This becomes really powerful because not all users need to see all the data.

My goal here is to show you how to the basics on how to use Object Level Security. Yes, there are more advanced options to configure a combination of Row Level Security and Object Level Security.

By using Object Level Security, it means that I can now have a single model which can be used for Financial and Non-Financial reporting.

Read on for an example.

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TLS 1.2 Support in MDAC and SQLOLEDB

Published 2021-03-01 by Kevin Feasel

Ron the Polymath notes a change slipped into Windows:

The October 2020 Preview releases of Windows builds 1809 (KB4580390), 1903/1909 (KB4580386), and 2004/20H2 (KB4580364) include the following change:

– Adds support for the Transport Layer Security (TLS) 1.1 and 1.2 protocols when connecting to SQL Server using the data providers in Microsoft Data Access Components (MDAC).

Click through for Ron’s experience and another update of potential interest.

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Enabling Always Encrypted in SQL Server

Published 2021-02-23 by Kevin Feasel

Scott Klein takes us through the process of enabling Always Encrypted:

Always Encrypted provides a separation between those who own the data and can view it, and those who manage the data but should have no access. Always Encrypted does this by allowing clients to encrypt sensitive data inside client applications while never revealing the encryption key to the database engine. 

One of our clients utilizes Always Encrypted to protect sensitive data. In our work for this client, we realized that a walkthrough documenting the end-to-end process of enabling Always Encrypted would be helpful for everyone.  

Click through for a walkthrough of the process.

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RBAC in Hadoop with Kudu and Ranger

Published 2021-02-17 by Kevin Feasel

Attila Bukor takes us through the process of setting up role-based access controls on Impala tables:

After setting up the integration it’s time to create some policies, as now only trusted users are allowed to perform any action; everyone else is locked out. Resource-based access control (RBAC) policies can be set up for Kudu in Ranger, but Kudu currently doesn’t support tag-based policies, row-level filtering or column masking.

Click through for the process, as well as current limitations.

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SPN Registration and dbatools

Published 2021-02-17 by Kevin Feasel

Jess Pomfret takes us through some SPN pains:

But instead of getting a quick answer to my question, I just got the following error:

WARNING: [15:19:49][Get-DbaDatabase] Error occurred while establishing connection to dscsvr1 | The target principal name is incorrect. Cannot generate SSPI context.

Just reading the article brought back some bad troubleshooting memories for me… But as usual, I’m impressed that dbatools has a cmdlet or two to help with that troubleshooting.

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Secure Cluster Connectivity in Azure Databricks

Published 2021-02-08 by Kevin Feasel

Abhinav Garg and Premal Shah have an announcement:

We’re excited to announce the general availability of Secure Cluster Connectivity (also commonly known as No Public IP) on Azure Databricks. This release applies to Microsoft Azure Public Cloud and Azure Government regions, in both Standard and Premium pricing tiers. Hundreds of our global customers including large financial services, healthcare and retail organizations have already adopted the capability to enable secure and reliable deployments of the Azure Databricks unified data platform. It allows them to securely process company and customer data in private Azure Virtual Networks, thus satisfying a major requirement of their enterprise governance policies.

Read on fore more detail about how this works.

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Windows Authentication Across Domains

Published 2021-02-08 by Kevin Feasel

Daniel Hutmacher shows three methods for connecting to a remote SQL Server instance on a different domain:

A jump box is a virtual desktop on the client’s domain that you can connect to using Remote Desktop. You’d obviously have to ask somebody for access to one, and you’d have to set up your development environment from scratch. This may not be a big issue if you’re in SSMS all of the time, but when you need the Power BI Desktop, Excel or even Visual Studio, this setup can take some time (not to mention asking for local admin credentials on the jump box).

A fourth option is to run the executable with runas and /netonly, like:

runas /user:domain\username ssms.exe /netonly

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