Full_Name: Sebastian Hetze Version: 2.3.30 OS: Linux URL: ftp://ftp.openldap.org/incoming/Sebastian-Hetze-pgk-070712.tgz Submission from: (NULL) (212.21.78.130)

Hi *,

in your FTP incoming you find a piece of software that we would like to contribute to the slapd-modules collection.

We hope you find it useful and we would very much like to receive feedback about useability, ideas for improvements and (in the very unlikely case of occurance ;-) bugreports and fixes.

Best regards

Sebastian Hetze

------------------------------------------------------------------------------------

Active Directory Password Cache ===============================

Active Directory does not provide any means to read user credentials on any public API. It is possible, to install additional libraries as password sniffer to catch and forward cleartext passwords on changes. In case you cannot or simply dont want to install such libraries, the Active Directory Password Cache overlay is your option.

The Active Directory Password Cache overlay allows to mirror user account credentials without any modification on the AD server. It only takes one occasional simple bind authentication against the OpenLDAP server.

If the credential has not been mirrored yet, the overlay uses the krbPrincipalName and the password provided by the user to perform a Kerberos init against the Active Directory. A successful Kerberos init guarantees a correct password for this principal, and therefor the bind finally succeeds.

Within this overlay operation, the password gets encrypted with the default OpenLDAP hash alorithm and stored as userPassword attribute. There is an option to update the sambaNTPassword also (using code borrowed from Howard Chu's smbk5pwd overlay). All following simple bind authentications will first try these cached credentials, making the OpenLDAP server independent from AD.

In case the user changes its password on the Active Directory server, the old password stays valid in OpenLDAP until the user first presents the new password for an simple bind. Within this bind operation, the overlay performs another Kerberos init and updates the cached credentials in OpenLDAP.