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LDAP Administration Guide
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13. Using SASL

OpenLDAP clients and servers are capable of authenticating via the Simple Authentication and Security Layer (SASL) framework, which is detailed in RFC4422. This chapter describes how to make use of SASL in OpenLDAP.

There are several industry standard authentication mechanisms that can be used with SASL, including GSSAPI for Kerberos V, DIGEST-MD5, and PLAIN and EXTERNAL for use with Transport Layer Security (TLS).

The standard client tools provided with OpenLDAP Software, such as ldapsearch(1) and ldapmodify(1), will by default attempt to authenticate the user to the LDAP directory server using SASL. Basic authentication service can be set up by the LDAP administrator with a few steps, allowing users to be authenticated to the slapd server as their LDAP entry. With a few extra steps, some users and services can be allowed to exploit SASL's proxy authorization feature, allowing them to authenticate themselves and then switch their identity to that of another user or service.

This chapter assumes you have read Cyrus SASL for System Administrators, provided with the Cyrus SASL package (in doc/sysadmin.html) and have a working Cyrus SASL installation. You should use the Cyrus SASL sample_client and sample_server to test your SASL installation before attempting to make use of it with OpenLDAP Software.

Note that in the following text the term user is used to describe a person or application entity who is connecting to the LDAP server via an LDAP client, such as ldapsearch(1). That is, the term user not only applies to both an individual using an LDAP client, but to an application entity which issues LDAP client operations without direct user control. For example, an e-mail server which uses LDAP operations to access information held in an LDAP server is an application entity.


LDAP Administration Guide
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  Published under the terms of the OpenLDAP Public License Design by Interspire