Re: Using LDAP how to restrict users to certain applications only

Thanks & Regards
Geo P.C.
www.geopc.co.cc

On Mon, May 13, 2013 at 8:27 PM, Peter Gietz <peter.gietz@daasi.de> wrote:

Your third acl allows everyone to read (by * read). You should delete that

olcAccess: {2}to * by self write by dn="cn=admin,dc=ds,dc=geo,dc=com"
write by * read

Peter

Am 13.05.2013 14:46, schrieb Geo P.C.:
Thanks Peter.

We created a user as follows:

dn: cn=zabbix,ou=Applications,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: zabbix
sn: zabbix
userPassword:: e1NIQX1NaTh4WX2V3dabTBGZ2JWRnY0L2s9

root@geopc:/etc/ldap/slapd.d/cn=config# ldapsearch -VV
ldapsearch: @(#) $OpenLDAP: ldapsearch (Oct 17 2012 19:48:03) $
buildd@komainu:/build/buildd/openldap-2.4.28/debian/build/clients/tools
(LDAP library: OpenLDAP 20428)

In /usr/share/slapd/slapd.conf we added acl but it’s not affecting so we added in olcAccess. It also default contents and please see the current settings.

root@geopc:/etc/ldap/slapd.d/cn=config# ldapsearch -Q -LLL -Y EXTERNAL -H ldapi:/// -b cn=config '(olcDatabase={1}hdb)' olcAccess
dn: olcDatabase={1}hdb,cn=config
olcAccess: {0}to attrs=userPassword,shadowLastChange by self write by anonymou
s auth by dn="cn=admin,dc=ds,dc=geo,dc=com" write by * none
olcAccess: {1}to dn.base="" by * read
olcAccess: {2}to * by self write by dn="cn=admin,dc=ds,dc=geo,dc=com"
write by * read
olcAccess: {3}to dn.sub="ou=People,dc=prime,dc=ds,dc=geo,dc=com" attrs
=userPassword by self write by * auth
olcAccess: {4}to dn.sub="ou=People,dc=prime,dc=ds,dc=geo,dc=com" filte
r="( allowedService=zabbix)" attrs=uid,objectClass by dn.exact="cn=zabbix,ou=App
lications,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com" read by self read

dn: olcDatabase={2}hdb,cn=config

root@geopc:/etc/ldap/slapd.d/cn=config#

With this setting zabbix application can be logged by all users in ou=People,dc=prime,dc=ds,dc=geo,dc=com.

Can you please have a check and please help me on it. Thanks in advance.

Geo
Thanks & Regards
Geo P.C.
www.geopc.co.cc
On Mon, May 13, 2013 at 4:04 PM, Peter Gietz <peter.gietz@daasi.de> wrote:
You shouldn't use user1 as binddn in the application but a dedicated service account.
And you should make sure that everyone is allowed to authenticate.

like so:

LDAP entry:
cn=zabix,ou=applications,dc=prime,dc=ds,dc=geo,dc=com
objectClass:...
...
userPassword: password

Zabix configuration
host: 192.168.1.1
base: ou=People,dc=prime,dc=ds,dc=geo,dc=com
port: 636
uid: uid
bind_dn: cn=zabix,ou=applications,dc=prime,dc=ds,dc=geo,dc=com
password: password

ACL configuration:

access to dn.sub="ou=People,dc=prime,dc=ds,dc=geo,dc=com"
attrs=userPassword
by self write
by * auth

access to dn.sub="ou=People,dc=prime,dc=ds,dc=geo,dc=com"
filter="(allowedService=zabbix)"
attrs=uid,objectClass
by dn.exact="cn=zabix,ou=applications,dc=prime,dc=ds,dc=geo,dc=com" read
by self read

Hope this works for you.

Cheers,

Peter

Am 13.05.2013 10:54, schrieb Geo P.C.:
Dear Peter

As per your suggestion In inetOrgPerson I created a custom attribute called allowedService and now the users list is as

dn: ou=People,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: organizationalUnit
ou: People

dn: uid=user1,ou=People,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: posixAccount
objectClass: inetOrgPerson
uid: user1
allowedService: zabbix
allowedService: gitlab

dn: uid=user2,ou=People,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: posixAccount
objectClass: inetOrgPerson
uid: user2
allowedService: gitlab

dn: uid=user3,ou=People,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: posixAccount
objectClass: inetOrgPerson
uid: user3
allowedService: gitlab

Now we have two applications zabbix and gitlb. For zabbix user1 need to have access others not. For gitlab three users should have access.

We have created two organizational units as

dn: ou=zabix,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: organizationalUnit
ou: zabbix

dn: ou=gitlab,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com
objectClass: top
objectClass: organizationalUnit
ou: gitlab

In zabbix application configured as follows:

    host: 192.168.1.1
    base: ou=zabix,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com
    port: 636
    uid: uid
    bind_dn: uid=user1,ou=People,dc=prime,dc=ds,dc=geo,dc=com
    password: password

In slapd.conf file we added acl as:

access to dn.base="ou=People,dc=prime,dc=ds,dc=geo,dc=com" filter="(allowedService=zabbix)" attrs=uid,userPassword by dn.exact="ou=zabix,ou=Groups,dc=prime,dc=ds,dc=geo,dc=com" read by * break

But with this configuration we are unable to login to zabix application with user user1.

Can you please help me on it. Let me know I am following the correct way? Can you please update me the correct steps we need to done.

Thanks in advance.
Geo
Skype id: geopcgeo
On Thu, May 9, 2013 at 4:30 PM, Geo P.C. <pcgeopc@gmail.com> wrote:
Dear Peter

Thanks for your update. As you specified I am trying to set up this option. Thanks again

Geo.
On Tue, May 7, 2013 at 8:34 PM, Peter Gietz <peter.gietz@daasi.de> wrote:
Hi Geo,

I don't think that alias object will be of use for you. Frankly I don't quite understand how you would like to use that.

What you should do as I proposed (solution 2b.):

define an attribute like allowedService and manage that instead of using groups.

create accounts for each application (all applications have binddn and bind password to connect to an ldap server)

And the restrict access rights of these DNs via ACLs such as :

access to filter=(allowedService=Wordpress)
by cn=wordpress,ou=serviceaccounts,dc=examle,dc=com
read
...

access to * by * none

Cheers,

Peter

Am 07.05.2013 14:59, schrieb Geo P.C.:
Dear Peter,

Thanks for your reply. In order to login to an application from a selected group only we checked alias option. But it was not working. Please see the details:
In application we have given base dn as ou=People,dc=geo,dc=com  and the user dn: uid=geo_pc,ou=People,dc=geo,dc=com can able to login to the application successfully.
Now we created an alias as follows:
dn: uid=geo_pc,ou=Applications,ou=Groups,dc=geo,dc=com
aliasedobjectname: uid=geo_pc,ou=People,dc=geo,dc=com 
objectclass: alias
objectclass: extensibleObject
objectclass: top
uid: geo_pc
Now in application we have given base dn as ou=Applications,ou=Groups,dc=geo,dc=com but with this user ou=Applications,ou=Groups,dc=geo,dc=com  we are unable to login to the application.
Please let us know is there any additional configuration we need to done. Can you please help me on it.
Thanks
Geo
Thanks & Regards
Geo P.C.
www.geopc.co.cc
On Tue, May 7, 2013 at 5:51 PM, Peter Gietz <peter.gietz@daasi.de> wrote:
1.) If you had a config parameter like search filter in your application you could use that to make unwanted users invisible for the application. But this means you can't use group entries , but dynamic groups, i.e. a group is an ldapfilter, e.g. "(allowedServices=Wordpress)" and you manage group privileges in an own attribute allowedServices.

2.) You could also do this via ACLs in the server, each application using its own bind dn, which can then have read access to a subset of the data. Here you can use a.) group entries or b.) dynamic groups

3.) Of course you could also have a separate replica for each application with filtered entries, but only with dynamic groups (see 1.), but that is a lot of overhead. Beware: combining this with 2. i.e. group ACLs on replica bindDN is a rathole, don't do that!

4.) IMHO best would be to file a feature request to the application developers for supporting LDAP-groups

if not 4.) my recommendation would be 2a.) being the minimal invasive alternative.

Hope this helps,

Peter

Am 06.05.2013 12:21, schrieb Geo P.C.:

Hi

We are using many applications like zabbix, phabricator, AC etc. We need to integrate LDAP in all these applications. These application support LDAP but not group based authentication.

Please let us know is there any option to restrict selected users to login. We created all users under ou ‘users’ .

On these application we need to login certain users only. How we can restrict it as we can’t able to restrict on application side

In these application they provide only “Base DN” and “Search Attribute” so we can’t able to give dn: ou=users,ou=system as it gives access to all users.

So is it possible to give Base DN as “cn=Zabbix,ou=groups,ou=system” and this group contains only user1 and user2. SO it will restrict users.

Please let us know how we can implement this scenario. Thanks in advance please help us to solve this issue.

Thanks
Geo
-- 

Peter Gietz, CEO

DAASI International GmbH        
Europaplatz 3                   
D-72072 Tübingen                
Germany                    

phone: +49 7071 407109-0
fax:   +49 7071 407109-9  
email: peter.gietz@daasi.de
web:   www.daasi.de

Sitz der Gesellschaft: Tübingen
Registergericht: Amtsgericht Stuttgart, HRB 382175
Geschäftsleitung: Peter Gietz
-- 

Peter Gietz, CEO

DAASI International GmbH        
Europaplatz 3                   
D-72072 Tübingen                
Germany                    

phone: +49 7071 407109-0
fax:   +49 7071 407109-9  
email: peter.gietz@daasi.de
web:   www.daasi.de

Sitz der Gesellschaft: Tübingen
Registergericht: Amtsgericht Stuttgart, HRB 382175
Geschäftsleitung: Peter Gietz
-- 

Peter Gietz, CEO

DAASI International GmbH        
Europaplatz 3                   
D-72072 Tübingen                
Germany                    

phone: +49 7071 407109-0
fax:   +49 7071 407109-9  
email: peter.gietz@daasi.de
web:   www.daasi.de

Sitz der Gesellschaft: Tübingen
Registergericht: Amtsgericht Stuttgart, HRB 382175
Geschäftsleitung: Peter Gietz
-- 

Peter Gietz, CEO

DAASI International GmbH        
Europaplatz 3                   
D-72072 Tübingen                
Germany                    

phone: +49 7071 407109-0
fax:   +49 7071 407109-9  
email: peter.gietz@daasi.de
web:   www.daasi.de

Sitz der Gesellschaft: Tübingen
Registergericht: Amtsgericht Stuttgart, HRB 382175
Geschäftsleitung: Peter Gietz