Tomek Rękawek created OAK-3498:
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             Summary: DN can't be used as the group name in the external auth 
handler
                 Key: OAK-3498
                 URL: https://issues.apache.org/jira/browse/OAK-3498
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: auth-external
    Affects Versions: 1.0.22, 1.3.7, 1.2.7
            Reporter: Tomek Rękawek
            Priority: Critical


One of the users wants to migrate his repository from Jackrabbit 2 to Oak. He 
uses LDAP for authentication. The LDAP synchronization in Jackrabbit 2 is 
configured in such manner, that both principal id and authorizable name is set 
to the DN (eg. {{CN=my-group,OU=abc,...}}).

After migration to Oak LDAP users can't login. The reason is that during the 
login, the {{DefaultSyncContext}} tries to synchronize all groups memberships 
and create missing groups. By default it uses CN as the group name and tries to 
find it. It fails, because the migrated group has a name created with its DN. 
It assumes that the group doesn't exist and then wants to create it - which 
fails as well, because group with the given principal name already exists. As a 
result, the whole login process fails.

The LDAP attribute to be used as the group name can be configured. However, the 
DN is not an attribute, so setting {{group.nameAttribute="dn"}} in 
{{LdapProviderConfig}} results in a {{NullPointerException}}.

I think two things can be improved here:

1. {{DefaultSyncContext}} should try to find a group using its principal name 
rather than group id.
2. It should be possible to use DN as the {{group.nameAttribute}}.



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