[Samba] Problems with Winbind Idmap and Active Directory 2008 r2

[Michael Adam]

Hi Matthew,

Matthew Choppen wrote:
> For our Linux Machines (SLES 10) we are using kerberos and LDAP to
> authenticate against Active Directory (works perfectly)
> 
> Please note that the same configuration works with Windows 2003 Server, the
> problem is with with Windows 2008 Server
> 
> However we are experiencing problems with winbind for the file share, I see
> in the "log.winbind-idmap" logfile the following errors
> 
> [2011/03/03 15:09:08.643286,  1]
> winbindd/idmap_ad.c:143(ad_idmap_cached_connection_internal)
>   ad_idmap_init: failed to connect to AD
> [2011/03/03 15:09:08.643323,  1]
> winbindd/idmap_ad.c:326(idmap_ad_unixids_to_sids)
>   ADS uninitialized: No logon servers
> The user from windows clients experiences extremely poor performance (I
> guess timeouts from winbind, and I would also guess that winbind then
> assigns some kind of default ID and not the real uid/gid from AD)
> 
> The Unix Services for windows is applied and the users have the correct UNIX
> settings (else LDAP / kerberos auth would not work)
> 
> I have also tried backend = ldap:ldap://OurADServer  which also does not
> work!!!

No, this won't work since the ldap idmap backend will search for
completely different attributes than the ad backend.

Before addressing the above connection error (which may even
be related), let's fix the configuration:

You should not configure "ad" as the default
idmap backend in smb.conf. This does not work since
a couple of releases actually.

Instead, you should configure something like this:

    idmap backend = tdb
    idmap uid = 1000000-1999999
    idmap gid = 1000000-1999999

    idmap config MYDOMAIN : backend  = ad
    idmap config MYDOMAIN : range = 1000-999999

Where you should make sure that the reange of the MYDOMAIN
setting covers the complete range of your IDs in AD.
(See "man idmap_ad" for more info.)

Could you change your config in the sense above and re-check?
(After restarting winbindd)

If the problems persist, we can continue to analyze the situation.

Cheers - Michael

> Here is our current configuration:
> 
> samba3-3.5.2-43.suse101.x86_64.rpm
> samba3-cifsmount-3.5.2-43.suse101.x86_64.rpm
> samba3-client-3.5.2-43.suse101.x86_64.rpm
> samba3-debuginfo-3.5.2-43.suse101.x86_64.rpm
> samba3-doc-3.5.2-43.suse101.x86_64.rpm
> samba3-utils-3.5.2-43.suse101.x86_64.rpm
> samba3-winbind-32bit-3.5.2-43.suse101.i586.rpm
> samba3-winbind-3.5.2-43.suse101.x86_64.rpm
> Samba Config
> 
> [global]
>     workgroup = MYDOMAIN
>     password server = OurADServer
>     domain master = no
>     realm =  MYDOMAIN.COM
>     server string = ClearCase Server
>     netbios name = OURNAME
>     security = ADS
>     encrypt passwords = yes
>     winbind use default domain = Yes
>     winbind nested groups = Yes
>     client use spnego = Yes
>     winbind enum users = Yes
>     winbind enum groups = Yes
>     template shell = /bin/bash
>     template homedir = /home/%u
>     log level = 2
>     log file = /var/log/samba/%m
>     max log size = 50
>     winbind separator = +
>     #idmap uid = 40000-50000
>     #idmap gid = 40000-50000
>     winbind offline logon = true
>     winbind cache time = 5
>     winbind refresh tickets = true
>     map to guest = Bad User
>     username map = /etc/samba/users.map
>     max open files = 11000
>     add machine script = /usr/sbin/useradd -c Machine -d /var/lib/nobody -s
> /bin/false %m$
>     ldap ssl = No
>     socket options = TCP_NODELAY SO_RCVBUF=16384 SO_SNDBUF=16384
>     idmap backend = ad
>     ldap idmap suffix = dc=mydomain,dc=com
>     ldap admin dn = CN=bindUserFromAD,OU=Siteroles,OU=HAM,DC=mydomain,dc=com
>     ldap suffix = dc=mydomain,dc=com
>     usershare allow guests = Yes
>     directory security mask = 0775
>     kernel oplocks = No
>     create mask = 0775
>     directory mask = 0775
>     map archive = No
>     oplocks = No
>     level2 oplocks = No
> [vobs]
>         comment = Vob storage directory
>         path = /vobs
>         valid users = @"MYDOMAIN+ccusers"
>         writeable = Yes
>         create mask = 0775
>         force directory mode = 0775
> [vobstore]
>         comment = Vob storage directory
>         path = /vobstore
>         valid users = @"MYDOMAIN+ccusers"
>         writeable = Yes
>         create mask = 0775
>         force directory mode = 0775
> [ccviews]
>         comment = View storage directory
>         path = /ccviews
>         valid users = @"MYDOMAIN+ccusers"
>         writeable = Yes
>         create mask = 0775
>         force directory mode = 0775
> Thanks for any assistance :)
> 
> Matt
> -- 
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