ADAM custom password policy

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Is it possible to make ADAM to call a configurable "plugin" to enforce
custom policy?
As I understand you can disable default policy enforcement (which calls
OS API NetValidateUserPassword) - so may be you can also refirect this
call somehow?

It would be nice to apply extended (comparing to OS) password policies
to users authenticating using standard LDAP; also, the "plugin" could
perform additional actions (e.g. auditing). And all of this using
secure and extensible AD store...

Any thoughts on this?

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