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I ‘ve never given too much attention to LDAP Proxy Authorization till recently when a colleague brought it up. It’s actually a very neat way to perform operations on an LDAP server as a normal user without requiring knowledge of the user’s credentials.  As a result you don’t need to setup an all powerful account but you can actually perform actions using a target user’s actual identity, simplifying access control policy on the LDAP server.

The above can come very handy in Single Sign On cases. Imagine a web site which uses Shibboleth to authenticate users (and thus has no knowledge of their password) but also has to perform actions on the user accounts stored on an LDAP server, either directly or by using a web service interface. Since the web site does not have the user’s password, it cannot perform an LDAP Bind with the user’s credentials. What it can do though is to bind as a special user which has proxy authorization privileges, SASL authorize to the user’s DN and perform the corresponding actions.

More information on Proxy Authorization and how to set it up in OpenLDAP can be found in the Administrator’s Guide ‘Using SASL’ chapter. One nice feature in OpenLDAP is that you can limit the accounts to which a user can authorize to to a specific user set defined either by an LDAP URL or a DN regular expression.

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Kostas Kalevras

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