No netgroup_provider?

[Spike White]

All,

Spoiler alert:  my configuration is working;  I just want verification I
did it right.

BACKGROUND:

I have an LDAP domain that was delivering autofs maps exclusively.  Other
(AD) domains were delivering users, groups, authentication and access.

Since this back-end LDAP domain didn’t participate in any user
authentication or access, I configured that backup LDAP domain in sssd.conf
with only an autofs_provder:

[domain/LDAP]

debug_level = 9

id_provider = none

autofs_provider = ldap

ldap_uri= ldap://austgcore17.example.com

ldap_schema = rfc2307bis

ldap_default_bind_dn = cn=ldapadm,dc=itzgeek,dc=local

ldap_default_authtok = ldppassword

ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local

ldap_autofs_map_object_class = automountMap

ldap_autofs_map_name = automountMapName

ldap_autofs_entry_object_class = automount

ldap_autofs_entry_key = automountKey

ldap_autofs_entry_value = automountInformation

ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local

Works great!  Get all expected automount maps.

CURRENT (ADDED NETGROUPS):

Now I have added NIS netgroups to this backend LDAP server.  Thus, it now
successfully delivers automount maps + netgroups.

I still don’t want this LDAP backend domain to even attempt authentication
and access – that’s in my other (AD) domains.

So you’d think all I’d have to do is change this:

[domain/LDAP]

…

id_provider = none

autofs_provider = ldap

to this:

[domain/LDAP]

…

id_provider = none

autofs_provider = ldap

netgroup_provider = ldap

But – point in fact – there is no “netgroup_provider” setting for sssd.conf
file.  Netgroup takes whatever the value is of ‘id_provider’.

So I turned on id_provider, then explicitly turned off all providers I
don’t want.  Is this correct?

[domain/LDAP]

debug_level = 9

#id_provider = none

id_provider = ldap

auth_provider = none

account_provider = none

chpass_provider = none

sudo_provider = none

subdomains_provider = none

autofs_provider = ldap

Also, any particular reason there’s not a netgroup_provider?

BTW, retrieving netgroups via sssd does not seem explicitly and concretely
documented.  That is, I had to consult multiple sources to get the RFC
2307bis setup, another to get  the sssd.conf settings.   (I’m not faulting
anyone; netgroups are rarely used anymore.)

Is there someone that maintains sssd documentation, I could submit a
concrete example – to help any future intrepid explorer?  I have the
specific back-end LDIF files,  the specific sssd.conf and nsswitch.conf
file setup.

Spike White

[Lukas Slebodnik]

On (18/02/19 10:53), Spike White wrote:
> All,
>
> Spoiler alert:  my configuration is working;  I just want verification I
> did it right.
>
> BACKGROUND:
>
> I have an LDAP domain that was delivering autofs maps exclusively.  Other
> (AD) domains were delivering users, groups, authentication and access.
>
> Since this back-end LDAP domain didn’t participate in any user
> authentication or access, I configured that backup LDAP domain in sssd.conf
> with only an autofs_provder:
>
> [domain/LDAP]
>
> debug_level = 9
>
> id_provider = none
>
> autofs_provider = ldap
>
> ldap_uri= ldap://austgcore17.example.com
>
> ldap_schema = rfc2307bis
>
> ldap_default_bind_dn = cn=ldapadm,dc=itzgeek,dc=local
>
> ldap_default_authtok = ldppassword
>
> ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local
>
> ldap_autofs_map_object_class = automountMap
>
> ldap_autofs_map_name = automountMapName
>
> ldap_autofs_entry_object_class = automount
>
> ldap_autofs_entry_key = automountKey
>
> ldap_autofs_entry_value = automountInformation
>
> ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local
>
> Works great!  Get all expected automount maps.
>
> CURRENT (ADDED NETGROUPS):
>
> Now I have added NIS netgroups to this backend LDAP server.  Thus, it now
> successfully delivers automount maps + netgroups.
>
> I still don’t want this LDAP backend domain to even attempt authentication
> and access – that’s in my other (AD) domains.
>
> So you’d think all I’d have to do is change this:
>
> [domain/LDAP]
>
> …
>
> id_provider = none
>
> autofs_provider = ldap
>
> to this:
>
> [domain/LDAP]
>
> …
>
> id_provider = none
>
> autofs_provider = ldap
>
> netgroup_provider = ldap
>
> But – point in fact – there is no “netgroup_provider” setting for sssd.conf
> file.  Netgroup takes whatever the value is of ‘id_provider’.
>
> So I turned on id_provider, then explicitly turned off all providers I
> don’t want.  Is this correct?
>
> [domain/LDAP]
>
> debug_level = 9
>
> #id_provider = none
>
> id_provider = ldap
>
> auth_provider = none
>
> account_provider = none
>
> chpass_provider = none
>
> sudo_provider = none
>
> subdomains_provider = none
>
> autofs_provider = ldap
>
> Also, any particular reason there’s not a netgroup_provider?

Because netgroups are part of id_provider
The same as users, groups and service. (There is neither user_provider nor
group_provider ...)

If you want to provide just netgroups then you might set sssd options
ldap_user_search_base and ldap_group_search_base( ldap_service_search_base)
to the part of LDAP tree which does not contain any users/groups.
> BTW, retrieving netgroups via sssd does not seem explicitly and concretely
> documented.  That is, I had to consult multiple sources to get the RFC
> 2307bis setup, another to get  the sssd.conf settings.   (I’m not faulting
> anyone; netgroups are rarely used anymore.)

Netgroups are retrieved by default if you have standard nisSchema[0] in your LDAP
server.

[domain/$DOMAIN]
    ldap_search_base = $BASE_DN
    id_provider = ldap
    ldap_uri = ldap://$SERVER
    ldap_tls_cacert = /etc/openldap/certs/cacert.asc

LS

[1] https://docs.oracle.com/cd/E36784_01/html/E38254/appendixa-3.html

[Jakub Hrozek]

On Mon, Feb 18, 2019 at 06:34:54PM +0100, Lukas Slebodnik wrote:
> > Also, any particular reason there’s not a netgroup_provider?
>
> Because netgroups are part of id_provider
> The same as users, groups and service. (There is neither user_provider nor
> group_provider ...)

btw the reasoning behind this is basically 'if it has an nsswitch map
provided by libc, it should be part of the ID provider'

[Spike White]

This LDAP domain has no user or group information.  Only automount maps and
netgroups.

I'm defining search_base only for autofs and netgroup:

ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local
ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local

I am not explicitly setting ldap_search_base.   If not explicitly set, the
sssd-ldap man page gives a lot of LDAP server-ese as to what value it takes
on:

Default [for ldap_search_base]: If not set, the value of the
defaultNamingContext or namingContexts attribute from the RootDSE of the
LDAP server
           is used. If defaultNamingContext does not exist or has an empty
value namingContexts is used. The namingContexts attribute
           must have a single value with the DN of the search base of the
LDAP server to make this work. Multiple values are are not
           supported.

(I don't understand that above paragraph from the man page.)

However, I do see in the LDAP_child.log that it does attempt a user
authentication.  We're using short login names, so I'm guessing it consults
each child domain for authentication.  I haven't checked the logs to see if
it is consulted during the access phase.

Anyway, since there are no users or groups in this LDAP child domain, I
should set:
    auth_provider = none
    account_provider = none

for this domain, so that it doesn't even consult this child domain for user
login -- correct?

Spike

On Mon, Feb 18, 2019 at 11:37 AM Lukas Slebodnik 
wrote:
> On (18/02/19 10:53), Spike White wrote:
> > All,
> >
> > Spoiler alert:  my configuration is working;  I just want verification I
> > did it right.
> >
> > BACKGROUND:
> >
> > I have an LDAP domain that was delivering autofs maps exclusively.  Other
> > (AD) domains were delivering users, groups, authentication and access.
> >
> > Since this back-end LDAP domain didn’t participate in any user
> > authentication or access, I configured that backup LDAP domain in
>
> sssd.conf
> > with only an autofs_provder:
> >
> > [domain/LDAP]
> >
> > debug_level = 9
> >
> > id_provider = none
> >
> > autofs_provider = ldap
> >
> > ldap_uri= ldap://austgcore17.example.com
> >
> > ldap_schema = rfc2307bis
> >
> > ldap_default_bind_dn = cn=ldapadm,dc=itzgeek,dc=local
> >
> > ldap_default_authtok = ldppassword
> >
> > ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local
> >
> > ldap_autofs_map_object_class = automountMap
> >
> > ldap_autofs_map_name = automountMapName
> >
> > ldap_autofs_entry_object_class = automount
> >
> > ldap_autofs_entry_key = automountKey
> >
> > ldap_autofs_entry_value = automountInformation
> >
> > ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local
> >
> > Works great!  Get all expected automount maps.
> >
> > CURRENT (ADDED NETGROUPS):
> >
> > Now I have added NIS netgroups to this backend LDAP server.  Thus, it now
> > successfully delivers automount maps + netgroups.
> >
> > I still don’t want this LDAP backend domain to even attempt authentication
> > and access – that’s in my other (AD) domains.
> >
> > So you’d think all I’d have to do is change this:
> >
> > [domain/LDAP]
> >
> > …
> >
> > id_provider = none
> >
> > autofs_provider = ldap
> >
> > to this:
> >
> > [domain/LDAP]
> >
> > …
> >
> > id_provider = none
> >
> > autofs_provider = ldap
> >
> > netgroup_provider = ldap
> >
> > But – point in fact – there is no “netgroup_provider” setting for
>
> sssd.conf
> > file.  Netgroup takes whatever the value is of ‘id_provider’.
> >
> > So I turned on id_provider, then explicitly turned off all providers I
> > don’t want.  Is this correct?
> >
> > [domain/LDAP]
> >
> > debug_level = 9
> >
> > #id_provider = none
> >
> > id_provider = ldap
> >
> > auth_provider = none
> >
> > account_provider = none
> >
> > chpass_provider = none
> >
> > sudo_provider = none
> >
> > subdomains_provider = none
> >
> > autofs_provider = ldap
> >
> > Also, any particular reason there’s not a netgroup_provider?
>
> Because netgroups are part of id_provider
> The same as users, groups and service. (There is neither user_provider nor
> group_provider ...)
>
> If you want to provide just netgroups then you might set sssd options
> ldap_user_search_base and ldap_group_search_base( ldap_service_search_base)
> to the part of LDAP tree which does not contain any users/groups.
> > BTW, retrieving netgroups via sssd does not seem explicitly and concretely
> > documented.  That is, I had to consult multiple sources to get the RFC
> > 2307bis setup, another to get  the sssd.conf settings.   (I’m not faulting
> > anyone; netgroups are rarely used anymore.)
>
> Netgroups are retrieved by default if you have standard nisSchema[0] in
> your LDAP
> server.
> [domain/$DOMAIN]
> ldap_search_base = $BASE_DN
> id_provider = ldap
> ldap_uri = ldap://$SERVER
> ldap_tls_cacert = /etc/openldap/certs/cacert.asc
>
>
> LS
>
> [1] https://docs.oracle.com/cd/E36784_01/html/E38254/appendixa-3.html
> _______________________________________________
> sssd-users mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]
> Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html
> List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
> List Archives:
> https://lists.fedorahosted.org/archives/list/[e-mail].o...

[Spike White]

Gotcha!  That reasoning makes sense.

I know that "autofs" is a special case.  Even though there's an "automount"
entry in /etc/nsswitch.conf file, I've read that automountd does not
technically use libnsswitch.so -- instead it "peeks" inside
/etc/nsswitch.conf file for the settings of that "automount"  entry.  And
automountd takes the appropriate action itself.

So automount is not a "an nsswitch map provided by libc", thus you have a
separate autofs_provider.

Spike

On Mon, Feb 18, 2019 at 3:02 PM Spike White  wrote:
> This LDAP domain has no user or group information.  Only automount maps
> and netgroups.
>
> I'm defining search_base only for autofs and netgroup:
>
> ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local
> ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local
>
> I am not explicitly setting ldap_search_base.   If not explicitly set, the
> sssd-ldap man page gives a lot of LDAP server-ese as to what value it takes
> on:
>        Default [for ldap_search_base]: If not set, the value of the
>
> defaultNamingContext or namingContexts attribute from the RootDSE of the
> LDAP server
>            is used. If defaultNamingContext does not exist or has an empty
> value namingContexts is used. The namingContexts attribute
>            must have a single value with the DN of the search base of the
> LDAP server to make this work. Multiple values are are not
>            supported.
>
> (I don't understand that above paragraph from the man page.)
>
> However, I do see in the LDAP_child.log that it does attempt a user
> authentication.  We're using short login names, so I'm guessing it consults
> each child domain for authentication.  I haven't checked the logs to see if
> it is consulted during the access phase.
>
> Anyway, since there are no users or groups in this LDAP child domain, I
> should set:
>     auth_provider = none
>     account_provider = none
>
> for this domain, so that it doesn't even consult this child domain for
> user login -- correct?
>
> Spike
>
> On Mon, Feb 18, 2019 at 11:37 AM Lukas Slebodnik 
> wrote:
> > On (18/02/19 10:53), Spike White wrote:
> > > All,
> > >
> > > Spoiler alert:  my configuration is working;  I just want verification I
> > > did it right.
> > >
> > > BACKGROUND:
> > >
> > > I have an LDAP domain that was delivering autofs maps exclusively.  Other
> > > (AD) domains were delivering users, groups, authentication and access.
> > >
> > > Since this back-end LDAP domain didn’t participate in any user
> > > authentication or access, I configured that backup LDAP domain in
> >
> > sssd.conf
> > > with only an autofs_provder:
> > >
> > > [domain/LDAP]
> > >
> > > debug_level = 9
> > >
> > > id_provider = none
> > >
> > > autofs_provider = ldap
> > >
> > > ldap_uri= ldap://austgcore17.example.com
> > >
> > > ldap_schema = rfc2307bis
> > >
> > > ldap_default_bind_dn = cn=ldapadm,dc=itzgeek,dc=local
> > >
> > > ldap_default_authtok = ldppassword
> > >
> > > ldap_autofs_search_base = ou=automount,ou=admin,dc=itzgeek,dc=local
> > >
> > > ldap_autofs_map_object_class = automountMap
> > >
> > > ldap_autofs_map_name = automountMapName
> > >
> > > ldap_autofs_entry_object_class = automount
> > >
> > > ldap_autofs_entry_key = automountKey
> > >
> > > ldap_autofs_entry_value = automountInformation
> > >
> > > ldap_netgroup_search_base = ou=netgroup,ou=admin,dc=itzgeek,dc=local
> > >
> > > Works great!  Get all expected automount maps.
> > >
> > > CURRENT (ADDED NETGROUPS):
> > >
> > > Now I have added NIS netgroups to this backend LDAP server.  Thus, it now
> > > successfully delivers automount maps + netgroups.
> > >
> > > I still don’t want this LDAP backend domain to even attempt
> >
> > authentication
> > > and access – that’s in my other (AD) domains.
> > >
> > > So you’d think all I’d have to do is change this:
> > >
> > > [domain/LDAP]
> > >
> > > …
> > >
> > > id_provider = none
> > >
> > > autofs_provider = ldap
> > >
> > > to this:
> > >
> > > [domain/LDAP]
> > >
> > > …
> > >
> > > id_provider = none
> > >
> > > autofs_provider = ldap
> > >
> > > netgroup_provider = ldap
> > >
> > > But – point in fact – there is no “netgroup_provider” setting for
> >
> > sssd.conf
> > > file.  Netgroup takes whatever the value is of ‘id_provider’.
> > >
> > > So I turned on id_provider, then explicitly turned off all providers I
> > > don’t want.  Is this correct?
> > >
> > > [domain/LDAP]
> > >
> > > debug_level = 9
> > >
> > > #id_provider = none
> > >
> > > id_provider = ldap
> > >
> > > auth_provider = none
> > >
> > > account_provider = none
> > >
> > > chpass_provider = none
> > >
> > > sudo_provider = none
> > >
> > > subdomains_provider = none
> > >
> > > autofs_provider = ldap
> > >
> > > Also, any particular reason there’s not a netgroup_provider?
> >
> > Because netgroups are part of id_provider
> > The same as users, groups and service. (There is neither user_provider nor
> > group_provider ...)
> >
> > If you want to provide just netgroups then you might set sssd options
> > ldap_user_search_base and ldap_group_search_base(
> > ldap_service_search_base)
> > to the part of LDAP tree which does not contain any users/groups.
> > > BTW, retrieving netgroups via sssd does not seem explicitly and
> >
> > concretely
> > > documented.  That is, I had to consult multiple sources to get the RFC
> > > 2307bis setup, another to get  the sssd.conf settings.   (I’m not
> >
> > faulting
> > > anyone; netgroups are rarely used anymore.)
> >
> > Netgroups are retrieved by default if you have standard nisSchema[0] in
> > your LDAP
> > server.
> > [domain/$DOMAIN]
> > ldap_search_base = $BASE_DN
> > id_provider = ldap
> > ldap_uri = ldap://$SERVER
> > ldap_tls_cacert = /etc/openldap/certs/cacert.asc
> >
> >
> > LS
> >
> > [1] https://docs.oracle.com/cd/E36784_01/html/E38254/appendixa-3.html
> > _______________________________________________
> > sssd-users mailing list -- [e-mail]
> > To unsubscribe send an email to [e-mail]
> > Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html
> > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
> > List Archives:
> > https://lists.fedorahosted.org/archives/list/[e-mail].o...