Protect Passwords
Equal permissions
The passwords of the users are stored in the SAP system as hash values. The quality of the hash values and thus their safety, however, depends on the hash algorithms used. The hash algorithms previously used in SAP systems are no longer considered safe; They can be cracked in a short time using simple technical means. You should therefore protect the passwords in your system in various ways. First, you should severely limit access to the tables where the hash values of the passwords are stored. This applies to the USR02 and USH02 tables and in more recent releases the USRPWDHISTORY table. The best way to assign a separate table permission group to these tables is to do so, as described in Tip 55, "Maintain table permission groups". In addition, you should also control the accesses using the S_TABU_NAM authorization object.
On the topic of SAP authorizations and SAP S/4HANA, I can recommend the SAP online course by Tobias Harmes as blended learning from Espresso Tutorials for SAP administrators, ABAP developers and people who are currently or will be dealing with SAP authorizations. The online course covers the following topics: - Introduction to the course - Why are SAP authorizations actually important? - How do SAP authorizations work technically? - Developing and maintaining roles - SAP Fiori authorizations/tile authorizations in S/4HANA - Developing authorization checks.
User Information System SUIM
The customising parameters in the table PRGN_CUST control the password generator in the transactions SU01 and SU10. The values of the profile parameters override the customising parameter entries to prevent invalid passwords from being generated. If the value of a customising parameter is less than the value of the corresponding profile parameter, the default value of the customising parameter is drawn instead. The same is true if no value is maintained. You can exclude certain words or special characters as passwords by entering them in the USR40 table. In this table you can enter both specific passwords (e.g. your company's name) and patterns for passwords (e.g. 1234*). '*' stands for any number of additional characters (wild card) and '?' for any character. However, when maintaining the USR40 table, note that the number and type of entries affect performance.
In order to sustainably guarantee the security of the SAP system internally and externally, regular auditing is indispensable. Existing rule violations must be detected and corrected. In addition, it is important to document the regular operation of SAP in order to have evidence of this for external and internal requirements. Automated processes can save a lot of time and money.
During go-live, the assignment of necessary authorizations is particularly time-critical. The "Shortcut for SAP systems" application provides functions for this purpose, so that the go-live does not get bogged down because of missing authorizations.
Whenever you want programmes to run periodically at specific times without user interaction, or when their runtime should not interfere with normal dialogue operations, schedule them as batch jobs in the background.
The website www.sap-corner.de offers a lot of useful information about SAP authorizations.
The Copy to Clipboard and Paste from Clipboard functions are not available if you maintain field values that allow only the selection of fixed values.