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# Managing Alias ldap object in FusionDirectory
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# Problem
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### Purpose
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We need to make objects aliases (not for mail) in Fusiondirectory.
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LdapAlias is a plugin which allow to manage ldap aliasedObjectName.
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Our Problem :
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### Fonctionality
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- We have a FusionDirectory server in latest version
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- We have a QNAP storage bay
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It will allow to create alias on objects on other part of the ldap tree to make them appears in only one branch.
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On QNAP, it's not possible (at the time of writing this) to have Samba
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accounts in multiple OUs. (not possible to make a subtree search)
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We must put all the users at the root level !
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### Problem
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We can search users with filter but it will be preferable if we can
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distribute user objects aliases in differents OU.
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The final user will can branch to the OU and obtain directly only the
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users in that OU.
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Applications searching the LDAP will be able to follow aliases if they support that.
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This can be done by setting the LDAP option LDAP_OPT_DEREF to LDAP_DEREF_ALWAYS. ldapsearch supports this with option "-a always".
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We search if it's possible in openldap and we find that :
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https://coderwall.com/p/c0w6-q/create-ldap-aliases-in-openldap
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This seems to match LDAP option LDAP_OPT_DEREF ldap_set_option
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# Alias plugin
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### Solution
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We can create an alias plugin in FD which allows to create/manage object of objectClass alias with only one field to enter the dn it should be an alias to.
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We create a plugin in FusionDirectory that manage aliasedObjectName attributes.
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Applications searching the LDAP will be able to follow aliases if they support that.
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This can be done by setting the LDAP option LDAP_OPT_DEREF to LDAP_DEREF_ALWAYS. ldapsearch supports this with option "-a always".
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This seems to match LDAP option LDAP_OPT_DEREF ldap_set_option |
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\ No newline at end of file |
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#### ldap objectClass
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```
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objectClass: alias
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objectClass: top
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objectClass: extensibleObject
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```
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#### Management list
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We should a a management class in FusionDirectory that manage this kind of objects, and allow to create new aliasedObjectName attributes.
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When we create a new aliasedObjectName attributes we should use :
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* a UsersAttribute for selecting the user is linked to for user alias
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* a xxxAttribute for selecting the user is linked to for group alias |
