Looking for a function of AIX in RHEL - user limits and ldap

Bear with me.  I'm a Red Hat Engineer, not an AIX person.  My current environment is a mix of AIX and RHEL (about 500 AIX and 200 RHEL).  I'm in the process of integrating our RHEL environment into our AD for authentication and authorization.  I've got most everything figured out.  Except for this.

Through some form of wizardry the AIX environment reads LDAP attributes for nofile, nproc and other ulimit settings and sets them for the user.  (Documented here http://www.ibm.com/developerworks/aix/library/au-aixldap/

As far as I've ever seen, Linux users' limits are set via the /etc/security/limits.conf or /etc/security/limits.d/*.conf files.   I have never seen another way (short of setting it manually via profiles)

Anyone else ever seen this implemented before?  Is there a linux version of what the AIX environment does here?

Thanks in advance... long-time user, first time poster...

Will