Re: Ldap filter to get group members

dhanushka ranasinghe wrote:

Hi guys...

Thanks for the reply ,

i tried many ldap filters according to the suggestion made by andrew..but i unable to get it work.. any idea how write such a filter.

Thank You

On 15 May 2012 03:03, Andrew Findlay <andrew.findlay@skills-1st.co.uk mailto:andrew.findlay@skills-1st.co.uk> wrote:

On Mon, May 14, 2012 at 08:06:41PM +0530, dhanushka ranasinghe wrote:

 > i have a LDAP server and its has a group called .
 >
 > cn=internal ou=group,dc=example,dc=com
 >
 > --users of this group is :
 >
 > uid=user1,ou=user,dc=example,dc=com
 > uid=user2,ou=user,dc=example,dc=com

 > i need to only to authenticate the users under cn=internal ....

I assume you mean "I only want to allow users of this group to access
some resource"

 > This is what we are using
 >
 >
(&(objectClass=groupOfNames)(memberOf=CN=internal,OU=group,DC=example,DC=com))
 >
 > seems like its not working ..
 >
 > what the LDAP search filter i need to use to get only the members of
the cn=
 > internal group  authenticated...

I think it would be best to use several LDAP operations rather than
trying to do everything in one go. For example:

1)      Search for user:
                base: ou=user,dc=example,dc=com
                filter: (&(objectclass=account)(uid=<username>))
        If the user exists, note the DN of the entry found.

2)      Authenticate user:
                Bind as the user DN using the user-supplied password
        If this fails, deny access.

3)      Re-bind as a system user (or anon if that has enough access)

4)      Check authorisation:
                Search base: CN=internal,OU=group,DC=example,DC=com
                Search scope: base
                Filter: (member=<user DN>)
                Return attributes: cn
        If this returns an entry then the user is in the authorisation
        group and should be allowed to use the resource. Otherwise,
        deny access.

Step 4 should just be an LDAP Compare operation.