You might consider a secure login for users affiliated to other instutitutions than your lab as well. Then you can implement a redirection to a set of IdPs with delegated permissions to authenticate users against your LDAP but also against many other LDAPs.
Feel free to come up with questions about this solution.
Nikolay
1) Assuming Galaxy can read LDAP directory service information, to what extent is access control enforced? Is it on a file system level?
2) If a researcher logs into Galaxy with his LDAP credentials, runs some analyses and obtains the results, how exactly are these results protected from other researchers who may be prohibited from accessing these results due to institutional policies? Accordingly, if a researcher wants to share the data product with another LDAP user, how is that done exactly apart from simply downloading and emailing it?