User Buffer in Software

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User Buffer
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User buffers are special areas (tables) containing all the authorizations for the user. These buffers are specific for individual users, and are actually built when the users log on, based on the authorizations contained in the profiles included in the user master record. When users try to perform activities in the system, the application programs and transaction are checked against the authorization objects and values contained within the user buffer. The number of entries in the user buffer can be controlled using the profile parameter auth / number_in_userbuffer.
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The Activation Concept in Profiles and Authorizations
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The authorization system allows two versions of authorizations or profiles: an active version and a modified, or maintenance, version. A new or modified authorization or profile cannot be used until it has been activated, since user master records can only contain active versions of profiles. The activation concept is useful for preventing mistakes when creating new authorizations or modifying existing ones, since the maintenance versions will not affect the system. It is also helpful for dividing the maintenance tasks among several users. For example, some users can define or edit authorizations, while an activation administrator can be in charge of activating the maintenance versions previously created. The system verification for access privileges is only performed against active versions. Active versions are the only ones which have real effect in the system. When administrators create or modify an authorization or a profile, then they are working with a maintenance version. In this state, the system displays the status Revised in the header of the authorization or profile being modified. When the activation is performed, the maintenance version becomes the active one and replaces automatically the existing version if it exists. The system changes the status to Active.
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Case Study: From the Authorization Fields to the Profiles, a Practical Example
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Case Study: From the Authorization Fields to the Profiles, a Practical Example
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The next example shows step by step how to manually create an authorization based on a standard authorization object. In the example, a new authorization for the development environment is created, allowing users to only perform activities in programs that belong to a particular development class. From the SAP main menu, select Tools Administration User maintainence Authorization. The system will display a screen similar to the one in Fig. 9 11. Notice that this screen shows only the object classes. You can use the scroll bars or the scroll buttons on the standard toolbar to display additional object classes.
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Figure 9 11: Authorization object classes initial screen. Double click over the Basis: Development Environment object class to display the list of objects for that class. Notice that the system displays only the descriptive text for the authorization objects. To see the name, click on the Technical name button on the application toolbar. Figure 9 12 shows the same objects as the previous figure but with the technical names.
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Figure 9 12: Technical names for authorization objects. To display the fields associated with the authorization object S_DEVELOP, position the cursor over the line and click on the Display fields button on the application toolbar. Figure 9 13 shows the screen display.
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Case Study: From the Authorization Fields to the Profiles, a Practical Example
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Figure 9 13: Authorization fields for the object ABAP development workbench. The values assigned to any of those fields configure the authorizations for that object. To display the list of existing authorizations for that object, double click over the S_DEVELOP line. The difference between these authorizations is in the values assigned to the fields of the authorization object. To see the field values, double click on any of the lines. In the example, you can create a new authorization from scratch or copy an existing one from the list. Scroll down to look up the field values for the authorization S_DEVELOP (notice that has the same name as the object), you can see that it has by default all permissions for the object. This is indicated by an asterisk (*) as the field value. Figure 9 14 shows the field values of the S_DEVELOP authorization.
Figure 9 14: Initial screen for displaying and maintaining authorization fields for an authorization. The standard authorizations should not be changed by the customers. Instead create a new one. Click once over the S_DEVELOP authorization, and then click on the Copy button on the application toolbar. The system displays the Copy authorization dialog box where you can enter your own authorization. In the example, the new authorization is called ZZDEVELOP. Remember that you cannot write an underscore in the second position. Click on the Copy button inside the dialog box. The system will go back to the authorization list. Now you can change the values for the authorization fields and include only access privileges for your own development class, which is one of the fields of the authorization objects. To do so, double click on your newly created authorization, which displays a similar screen to the one shown in Fig. 9 14. Position the cursor on the Development class for Workbench organizer field and click the Maintain values button on the 328
Case Study: From the Authorization Fields to the Profiles, a Practical Example application toolbar. The system displays a screen like the one shown in Fig. 9 15. This dialog box has several input fields which allow you to limit with single values or using value ranges which will be the permitted development classes for users having that authorization. These input fields include possible entries arrows for selecting available values. In the example, all development classes from ZAAA to ZZZZ are permitted.
Figure 9 15: Entering values in an authorization field. Click on the Enter button, and finally save your new authorization by clicking on the Save button on the standard toolbar. Follow the same procedure for modifying the authorization, so that users can only display system objects belonging to those development classes. In that case, the field value you want to modify is the one corresponding to Activity. When modifying the Activity field, clicking on the possible entries arrow shows the list of possible activities. Figure 9 16 displays this dialog box. Select the activity 03 which corresponds to Display. This tells the system that the user is only allowed to display development objects. Save your new authorization.
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