🚀: LDAAP: Add a filter to find bind DN

[jip149]

Which feature or improvement would you like to request?

Currently, the username the clients sends has to be part of the DN.

A more flexible approach would be to implement a filter that searches for the DN. This woud allow to login with fields that are not on the DN, eg. email.

Instead of
Bind Auth DN eg uid=?,ou=people,dc=example,dc=org

Use
Bind Auth Filter eg (&(objectClass=person)(|(uid=?)(mail=?)))
Perform search with Bind DN
Bind Auth using dn of results

See maddy for an example of implementation https://maddy.email/reference/auth/ldap/

Is your feature request related to a problem?

No response

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