Attribute Based Access Control (ABAC) – Field Mask...

AmitKrSingh · ‎2023 Feb 28

Introduction

In this blog post, we will learn how to mask “Gross Weight” and “Net Weight” fields in MARA table in transactions SE16 and MM03 for materials of Sensitive Material Group "300".

Attribute based authorizations are dynamic determination mechanism which determines whether a user is authorized to access specific data sets which can be based on the context attributes of the user and data (for example, price of certain sensitive materials are masked).

The result will appear as:

Prerequisite

Product “UI data protection masking for SAP S/4HANA” is used in this scenario to protect sensitive data at field level and must be installed in the S/4HANA system.

The product is a cross-application product which can be used to mask/protect any field in SAP GUI, SAPUI5/SAP Fiori, CRM Web Client UI, and Web Dynpro ABAP.

Let’s begin

Configuration to achieve masking

Logical Attribute is a functional modelling of how any attribute such as Social Security Number, Bank Account Number, Amounts, Pricing information, Quantity etc. should behave with masking.

Configure Logical Attribute

Follow the given path:

SPRO -> SAP NetWeaver -> UI Data Protection Masking for SAP S/4HANA -> Sensitive Attribute Configuration -> Maintain Metadata Configuration -> Maintain Logical Attributes

Gross Weight

Net Weight

Material Group

Configure Value Range

Value Ranges are a set of pre-populated values which can be used to derive the context under which an action should be executed.

Follow the given path:

SPRO -> SAP NetWeaver -> UI Data Protection Masking for SAP S/4HANA -> Sensitive Attribute Configuration -> Maintain Metadata Configuration -> Maintain Attributes and Ranges for Policy – Follow below mentioned steps:

Range for Material Group

Click on “New Entries” button

Enter “Value Range” as “VR_MATGROUP”

Select “Application Module” as “* Cross-Application”

Enter “Description” as “Range for Material Group”

Click on “Save” button

Enter entries in “VR_MATGROUP” Value Range

Execute Transaction Code “/UISM/V_RANGE”

Click on “VR_MATGROUP” Value Range

Click on “Display<- -> Change” button

Click on “Add New Entry” button

Add Value as “300” and Description as “Aircrafts” under “Include Value” tab

Click on “Save” button

Maintain Technical Address

In this step, we will associate the Technical Address of the fields to be masked with the Logical Attributes.

You can get the Technical Address of a GUI field by pressing “F1” on the field.

Follow the given path:

SPRO -> SAP NetWeaver -> UI Data Protection Masking for SAP S/4HANA -> Sensitive Attribute Configuration -> Maintain Metadata Configuration -> Maintain Technical Address

Follow below mentioned steps:

Under “GUI Table Field Mapping”, maintain technical address for following fields.

Gross Weight

Click on “New Entries” button

Enter “Table Name” as “MARA”

Enter “Field Number” as “BRGEW”

Enter “Logical Attribute” as “LA_BRWEIGHT”

Enter “Description” as “Material Gross Weight”

Click on “Save” button

Net Weight

Click on “New Entries” button

Enter “Table Name” as “MARA”

Enter “Field Number” as “NTGEW”

Enter “Logical Attribute” as “LA_NTWEIGHT”

Enter “Description” as “Material Net Weight”

Click on “Save” button

Material Group

Click on “New Entries” button

Enter “Table Name” as “MARA”

Enter “Field Number” as “MATKL”

Enter “Logical Attribute” as “LA_MATGROUP”

Enter “Description” as “Material Group”

Click on “Save” button

Mass Configuration

For all the above entries, “Mass Configuration” report should be executed which is required to generate technical addresses.

Follow below mentioned steps:

Select the entries in GUI Table Field Mapping

Click on “Mass Configuration” button

Click on “Select All” button

Click on “Generate Customizing” button

Save the information

Policy Configuration

A Policy is a combination of rules and actions which are defined in one or more blocks. The actions are executed on a sensitive entity (field to be protected) which has to be assigned to a Policy. The conditions are based on contextual attributes which help derive the context.

Context Attributes are logical attributes which are used in designing the rules of a policy. They are mapped to fields which are used to derive the context under which an action is to be executed on a sensitive entity.

Sensitive Entities are logical attributes which are sensitive and need to be protected from unauthorized access.

Follow the given path:

SPRO -> SAP NetWeaver -> UI Data Protection Masking for SAP S/4HANA -> Sensitive Attribute Configuration -> Masking and Blocking Configuration -> Maintain Policy Details for Attribute based Authorizations – Follow below mentioned steps:

Click on “New Entries” button

Enter “Policy Name” as “POL_SENSITIVE_MAT”

Select “Type” as “Field Level Masking”

Select “Application Module” as “* Cross-Application”

Enter “Description” as “Mask Sensitive Attributes of Material”

Click on “Save” button

Write following logic into Policy

Maintain Field Level Security and Masking Configuration

Here, we will define how masking will behave with the logical attribute that we created in above step.

Follow the given path:

SPRO -> SAP NetWeaver -> UI Data Protection Masking for SAP S/4HANA -> Sensitive Attribute Configuration -> Masking and Blocking Configuration -> Maintain Field Level Security and Masking Configuration

Follow below mentioned steps:

Click on “New Entries” button

Enter “Sensitive Entity” as “LA_BRWEIGHT” and press “Enter” key. “Description” and “Application Module” will get populated in corresponding fields

Check “Enable Configuration” check-box

Select “Attribute Based Authorization” option

Enter “Policy Name” as “POL_SENSITIVE_MAT”

Click on “Save” button

Click on “New Entries” button

Enter “Sensitive Entity” as “LA_NTWEIGHT” and press “Enter” key. “Description” and “Application Module” will get populated in corresponding fields

Check “Enable Configuration” check-box

Select “Attribute Based Authorization” option

Enter “Policy Name” as “POL_SENSITIVE_MAT”

Click on “Save” button

Conclusion

In this blog post, we have learnt how Attribute-based masking is achieved in transactions SE16 and MM03 for masking “Gross Weight” and “Net Weight” fields for materials of Material Group "300".