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Allow to switch off username conversion to lowercase
We are currently using Db2, SLES11, RACF/LDAP (zOS). Application users (personalized users, not system users) connecting to Db2 are defined in RACF/LDAP.
Db2 user authentication and authorization is using Transparent LDAP, accessing RACF/LDAP. The usernames in RACF/LDAP are defined using uppercase letters, e.g. S123456 (zOS). DB2 privileges like "connect, select, update ..." are granted to LDAP groups, but not the primary group of a user. (System users like Db2 instance users and administration users (performing loads into DB2) are managed locally on Liunux by /etc/passwd.)
This architecture worked well using SLES11, after Linux migration to SLES12 it did not work anymore. The reason is on the one hand SLES12 is not case insensitive regarding usernames anymore, SLES11 was case insensitive (the changed behavior is treated as a correction by SuSE). On the other hand it was found out Db2 is converting usernames always to lowercase, e.g. Db2 converts username [S123456] to [s123456] for groupset enumeration.
Thus, if Db2 establishes a connection using conversion "lower(username)" the secondary groups of username are not returned by LDAP, leading to missing permissions. User/password authenticatoin is working this way, but not evaluating the secondary groups. If Db2 would provide a way (e.g. Db2 registry variable) to switch off the conversion of the username, RACF/LDAP would return the complete user group-list. See Db2 case TS002722481 (and Linux case TS002758643, TS002764890).
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