providers/ldap: rework Schema and DSE (#5838)

* rework Root DSE

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* always parse filter objectClass

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* start adding LDAP Schema

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add more schema

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* update schema more

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix cn for schema

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* only include main DN in namingContexts

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* use schema from gh

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add description

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add response filtering

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix response filtering

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* don't return rootDSE entry when searching for singleLevel

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* remove currentTime

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix attribute filtering

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* set SINGLE-VALUE

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix numbers

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

internal/outpost/ldap/constants/constants.go

@@ -1,9 +1,18 @@
 package constants
 
+const OC = "objectClass"
+
 const (
 	OCTop         = "top"
 	OCDomain      = "domain"
 	OCNSContainer = "nsContainer"
+	OCSubSchema   = "subschema"
+)
+
+const (
+	SearchAttributeNone           = "1.1"
+	SearchAttributeAllUser        = "*"
+	SearchAttributeAllOperational = "+"
 )
 
 const (
@@ -20,7 +29,7 @@ const (
 	OCOrgPerson     = "organizationalPerson"
 	OCInetOrgPerson = "inetOrgPerson"
 	OCAKUser        = "goauthentik.io/ldap/user"
-	OCPosixAccount        = "posixAccount"
+	OCPosixAccount  = "posixAccount"
 )
 
 const (