The mapping between an LDAP account and an SUL account is currently stored in Striker's local mysql database as part of the labsauth_labsuser table. This is convenient for Striker, but not convenient for other LDAP consumers who may want to use the same data.
The WMF corp LDAP schema was recently extended to support a wikimediaPerson object class (rOPUP6386a7a, rOPUP2ce2697). Something similar could be done for the labs/prod LDAP servers to give us a class and attribute for storing the SUL account. Striker would then be updated to add the new object class and attribute to an LDAP account when linking accounts.