Dynamic row level security with Analysis services tabular model
Using a sample dataset to work through the steps below, this tutorial shows you how to implement row level security in an Analysis Services Tabular Model and use it in a Power BI report.
- Create a new security table in the AdventureworksDW2012 database
- Build the tabular model with necessary fact and dimension tables
- Define user roles and permissions
- Deploy the model to an Analysis Services tabular instance
- Build a Power BI Desktop report that displays data tailored to the user accessing the report
- Deploy the report to Power BI service
- Create a new dashboard based on the report
- Share the dashboard with your coworkers
This tutorial requires the AdventureworksDW2012 database.
Task 1: Create the user security table and define data relationship
You can find many articles describing how to define row level dynamic security with the SQL Server Analysis Services (SSAS) tabular model. For our sample, we use Implement Dynamic Security by Using Row Filters.
The steps here require using the AdventureworksDW2012 relational database.
In AdventureworksDW2012, create the DimUserSecurity table as shown below. You can use SQL Server Management Studio (SSMS) to create the table.
Once you create and save the table, you need to establish the relationship between the DimUserSecurity table's SalesTerritoryID column and the DimSalesTerritory table's SalesTerritoryKey column, as shown below.
In SSMS, right-click on the DimUserSecurity table, and select Design. Then select Table Designer -> Relationships.... When done, save the table.
Add users to the table: right-click on the DimUserSecurity table and select Edit Top 200 Rows. Once you’ve added users, the DimUserSecurity table should appear similar to the following, though with your own users:
You'll see these users in upcoming tasks.
Next, do an inner join with the DimSalesTerritory table, which shows the user associated region details. The SQL code here does the inner join, and the image shows how the table then appears.
select b.SalesTerritoryCountry, b.SalesTerritoryRegion, a.EmployeeID, a.FirstName, a.LastName, a.UserName from [dbo].[DimUserSecurity] as a join [dbo].[DimSalesTerritory] as b on a.[SalesTerritoryID] = b.[SalesTerritoryKey]
The image shows who is responsible for each sales region, thanks to the relationship created in Step 2. For example, you can see that Jon Doe is responsible for Australia.
Task 2: Create the tabular model with facts and dimension tables
Once your relational data warehouse is in place, you need to define the tabular model. You can create the model using SQL Server Data Tools (SSDT). For more information, see Create a New Tabular Model Project.
Import all the necessary tables into the model as shown below.
Once you’ve imported the necessary tables, you need to define a role called SalesTerritoryUsers with Read permission. Select the Model menu in SQL Server Data Tools, and then select Roles. In the Role Manager dialog box, select New.
Under Members tab in the Role Manager, add the users that you defined in the DimUserSecurity table in Task 1 - step 3.
Next, add the proper functions for both DimSalesTerritory and DimUserSecurity tables, as shown below under Row Filters tab.
In this step, you use the LOOKUPVALUE function to return values for a column in which the Windows user name matches the one the USERNAME function returns. You can then restrict queries to where the LOOKUPVALUE returned values match ones in the same or related table. In the DAX Filter column, type the following formula:
=DimSalesTerritory[SalesTerritoryKey]=LOOKUPVALUE(DimUserSecurity[SalesTerritoryID], DimUserSecurity[UserName], USERNAME(), DimUserSecurity[SalesTerritoryID], DimSalesTerritory[SalesTerritoryKey])
In this formula, the LOOKUPVALUE function returns all values for the DimUserSecurity[SalesTerritoryID] column, where the DimUserSecurity[UserName] is the same as the current logged on Windows user name, and DimUserSecurity[SalesTerritoryID] is the same as the DimSalesTerritory[SalesTerritoryKey].
When using row level security, the DAX function USERELATIONSHIP is not supported.
The set of Sales SalesTerritoryKey's LOOKUPVALUE returns is then used to restrict the rows shown in the DimSalesTerritory. Only rows where the SalesTerritoryKey value is in the IDs that the LOOKUPVALUE function returns are displayed.
For the DimUserSecurity table, in the DAX Filter column, add the following formula:
This formula specifies that all columns resolve to
false; meaning DimUserSecurity table columns can't be queried.
Now you need to process and deploy the model. For more information, see the Deploy article.
Task 3: Add Data Sources within your On-premises data gateway
Once your tabular model is deployed and ready for consumption, you need to add a data source connection to your on-premises Analysis Services tabular server.
To allow the Power BI service access to your on-premises analysis service, you need an On-premises data gateway installed and configured in your environment.
Once the gateway is correctly configured, you need to create a data source connection for your Analysis Services tabular instance. For more information, see Manage your data source - Analysis Services.
With the previous step complete, the gateway is configured and ready to interact with your on-premises Analysis Services data source.
Task 4: Create report based on analysis services tabular model using Power BI desktop
Launch Power BI Desktop and select Get Data > Database.
From the data sources list, select the SQL Server Analysis Services Database and select Connect.
Fill in your Analysis Services tabular instance details and select Connect Live. Then select OK. With Power BI, dynamic security works only with Live connection.
You can see that the deployed model is in the Analysis Services instance. Select the respective model and then select OK.
Power BI Desktop now displays all the available fields, to the right of the canvas in the Fields pane.
In the Fields pane on the right, select the SalesAmount measure from the FactInternetSales table and the SalesTerritoryRegion dimension from the SalesTerritory table.
To keep this report simple, we won’t add any more columns right now. To have a more meaningful data representation, change the visualization to Donut chart.
Once your report is ready, you can directly publish it to the Power BI portal. From the Home ribbon in Power BI Desktop, select Publish.
Task 5: Create and share a dashboard
You’ve created the report and published it to the Power BI service. Now you can use the example created in previous steps to demonstrate the model security scenario.
In the role as Sales Manager, Sumit can see data from all the different sales regions. Sumit creates this report (the report created in the previous task steps) and publishes it to the Power BI service.
Once Sumit publishes the report, he creates a dashboard in the Power BI service called TabularDynamicSec based on that report. In the following image, notice that Sumit can see the data corresponding to all the sales region.
Now Sumit shares the dashboard with a colleague, Jon Doe, who is responsible for the Australia region sales.
When Jon Doe logs in to the Power BI service and views the shared dashboard that Sumit created, he should only see sales from the his region.
Congratulations! The Power BI service shows the dynamic row level security defined in the on-premises Analysis Services tabular model. Power BI uses the EffectiveUserName property to send the current Power BI user credential to the on-premises data source to run the queries.
Task 6: Understand what happens behind the scenes
This task assumes you're familiar with SQL Profiler, since you need to capture a SQL Server profiler trace on your on-premises SSAS tabular instance.
The session gets initialized as soon as the user (Jon Doe) accesses the dashboard in the Power BI service. You can see that the salesterritoryusers role takes an immediate effect with the effective user name as
Based on the effective user name request, Analysis Services converts the request to the actual moonneo/jondoe credential after querying the local Active Directory. Once Analysis Services gets the credential, Analysis Services returns the data the user has permission to view and access.
If more activity occurs with the dashboard, for example, if Jon Doe goes from the dashboard to the underlying report, with SQL Profiler you would see a specific query coming back to the Analysis Services tabular model as a DAX query.
You can also see below the DAX query that is getting executed to populate report data.
EVALUATE ROW( "SumEmployeeKey", CALCULATE(SUM(Employee[EmployeeKey])) ) <PropertyList xmlns="urn:schemas-microsoft-com:xml-analysis">`` <Catalog>DefinedSalesTabular</Catalog> <Cube>Model</Cube> <SspropInitAppName>PowerBI</SspropInitAppName> <EffectiveUserName>firstname.lastname@example.org</EffectiveUserName> <LocaleIdentifier>1033</LocaleIdentifier> <ClientProcessID>6408</ClientProcessID> <Format>Tabular</Format> <Content>SchemaData</Content> <Timeout>600</Timeout> <DbpropMsmdRequestID>8510d758-f07b-a025-8fb3-a0540189ff79</DbpropMsmdRequestID> <DbPropMsmdActivityID>f2dbe8a3-ef51-4d70-a879-5f02a502b2c3</DbPropMsmdActivityID> <ReturnCellProperties>true</ReturnCellProperties> <DbpropMsmdFlattened2>true</DbpropMsmdFlattened2> <DbpropMsmdActivityID>f2dbe8a3-ef51-4d70-a879-5f02a502b2c3</DbpropMsmdActivityID> </PropertyList>
On-premises row level security with Power BI is only available with Live Connection.
Any changes in the data after processing the model would be immediately available for the users accessing the report with Live Connection from the Power BI service.