[Samba] Samba 4 and MS Windows NFS Server (2012R2) - Update

Ritter, Marcel (RRZE) marcel.ritter at fau.de
Tue Sep 1 10:30:53 UTC 2015


Hi Louis,

as I mentioned in my first mail on this topic, the setup is working quite fine
as long as NFS server and client are both Linux based.

Only the Microsoft NFS Server seems to trigger some different lookups,
that fail.

DNS is fine - both forward and reverse.
And yes I got all those UPNs in the keytab.

I also had a quick look at the check script, and I'll give it a try later this
week. According to my experience it would be *very* handy to have
a check script like this, especially when dealing with NFS.

Bye,
   Marcel

-----Urspr√ľngliche Nachricht-----
Von: samba [mailto:samba-bounces at lists.samba.org] Im Auftrag von L.P.H. van Belle
Gesendet: Dienstag, 1. September 2015 11:52
An: samba at lists.samba.org
Betreff: Re: [Samba] Samba 4 and MS Windows NFS Server (2012R2) - Update

hai, 

The servers have "A and PTR" records? 
You have for both server these UPNs. 

nfs/${SETFQDN} ${SETHOSTNAME_CAPS}$
nfs/${SETFQDN}@${SAMBA_KERBEROS_REALM} ${SETHOSTNAME_CAPS}$

on the samba side the nfs spn is in you keytab file? 

and if your brave, read, * dont run it, since i did not test this with windows servers. 

https://secure.bazuin.nl/scripts/these_are_experimental_scripts/
check the setup-nfsv4-kerberos.sh script, tested in a samba4 only setup, on debian (wheezy and jessie) and its not quite finished, i think.. 



Greetz, 

Louis



>-----Oorspronkelijk bericht-----
>Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
>Ritter, Marcel (RRZE)
>Verzonden: dinsdag 1 september 2015 11:25
>Aan: samba at lists.samba.org
>Onderwerp: Re: [Samba] Samba 4 and MS Windows NFS Server 
>(2012R2) - Update
>
>Hi again,
>
>I just started to debug things on the samba4 side:
>
>When trying to mount the Windows NFS share, I get the 
>following error on
>the samba4 dc (just grepping for nfs in the logs):
>
>  auth_check_password_send: Checking password for unmapped 
>user [S5DOM.TEST]\[nfs/nfsclient.mydom.test]@[]
>  map_user_info_cracknames: Mapping user 
>[MYDOM.TEST]\[nfs/nfsclient.mydom.test] from workstation []
>  auth_check_password_send: mapped user is: 
>[MYDOM]\[nfs/nfsclient.mydom.test]@[]
>   expr: (&(sAMAccountName=nfs/nfsclient.mydom.test)(objectclass=user))
>  sam_search_user: Couldn't find user 
>[nfs/nfsclient.mydom.test] in samdb, under DC=mydom,DC=test
>  auth_check_password_recv: sam_ignoredomain authentication 
>for user [S5DOM\nfs/nfsclient.mydom.test] FAILED with error 
>NT_STATUS_NO_SUCH_USER
>
>From a first search, it looks like function authsam_search_account()
>from source4/auth/ntlm/auth_sam.c does this lookup (and fails).
>
>I guess this search should look something like this:
>
>(&(|(sAMAccountName=nfs/nfsclient.mydom.test)(userPrincipalName
>=nfs/nfsclient.mydom.test at MYDOM.TEST))(objectclass=user))
>
>I'd like to give this a try, however I've no idea how to get 
>the required
>realm name from the parameters available during 
>authsam_search_account()
>call.
>
>Please, could someone more familiar with the samba code base provide me
>with the required information to do this?
>
>Bye,
>   Marcel
>
>-----Urspr√ľngliche Nachricht-----
>Von: samba [mailto:samba-bounces at lists.samba.org] Im Auftrag 
>von Ritter, Marcel (RRZE)
>Gesendet: Montag, 31. August 2015 08:44
>An: samba at lists.samba.org
>Betreff: [Samba] Samba 4 and MS Windows NFS Server (2012R2)
>
>Hi,
>
>has anyone out there tried to get a Windows Server 2012R2 
>based NFS Server running against a Samba4 active directory?
>
>I'm currently doing some interop testing, and I cannot get a 
>Windows Server 2012R2 based NFS  server running when using samba as AD.
>
>As far as i can tell, the setup looks good:
>
>I've got Linux based NFS servers and clients  (Ubuntu + SuSE) 
>up and running fine (krb5 auth against samba DC), but trying 
>to access the Windows NFS server fails.
>
>Outside the above testbed I've tried to mount NFS shares on a 
>different Windows Server (joined against our MS AD) and access 
>from Linux clients works fine here, so I guess it's not MS NFS 
>server itself that's causing the trouble.
>
>
>The failing windows NFS Server reports lots of messages like:
>
>"Server for NFS was unable to obtain security information for 
>the GSS user account MYDOM.TEST\nfs/nfsclient.mydom.test.
>
>Check that the user account MYDOM.TEST\nfs/nfsclient.mydom.test
>is valid and meets als configured security policies. Ther may 
>be additional information in the Windows Security event log.
>
>MSV Status: 0xC000009A, Substatus: 0x0
>S4U Status: 0xC000006D, Substatus: 0x0
>"
>
>The security log reports:
>
>"An account failed to log on.
>
>Subject:
>        Security ID:            SYSTEM
>        Account Name:           WIN12$
>        Account Domain:         MYDOM
>        Logon ID:               0x3E7
>
>Logon Type:                     3
>
>Account For Which Logon Failed:
>        Security ID:            NULL SID
>        Account Name:           nfs/nfsclient.mydom.test
>        Account Domain:         MYDOM.TEST
>
>Failure Information:
>        Failure Reason:         Unknown user name or bad password.
>        Status:                 0xC000006D
>        Sub Status:             0xC0000064
>
>Process Information:
>        Caller Process ID:      0x4
>        Caller Process Name:
>
>Network Information:
>        Workstation Name:
>        Source Network Address: -
>        Source Port:            -
>
>Detailed Authentication Information:
>        Logon Process:          NfsSvr
>        Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
>        Transited Services:     -
>        Package Name (NTLM only):       -
>        Key Length:             0
>
>This event is generated when a logon request fails. It is 
>generated on the computer where access was attempted.
>
>The Subject fields indicate the account on the local system 
>which requested the logon. This is most commonly a service 
>such as the Server service, or a local process such as 
>Winlogon.exe or Services.exe.
>
>The Logon Type field indicates the kind of logon that was 
>requested. The most common types are 2 (interactive) and 3 (network).
>
>The Process Information fields indicate which account and 
>process on the system requested the logon.
>
>The Network Information fields indicate where a remote logon 
>request originated. Workstation name is not always available 
>and may be left blank in some cases.
>
>The authentication information fields provide detailed 
>information about this specific logon request.
>        - Transited services indicate which intermediate 
>services have participated in this logon request.
>        - Package name indicates which sub-protocol was used 
>among the NTLM protocols.
>        - Key length indicates the length of the generated 
>session key. This will be 0 if no session key was requested.
>"
>
>For me it looks like Windows NFS server does some 
>additional/different lookups that fail on a samba backend but 
>succeed against a Windows AD, but that's just a guess.
>
>Is there an easy way to debug LDAP lookups (and results) in 
>Samba 4 (by setting a certain log level maybe)?
>
>Any other ideas what could cause this?
>
>Marcel
>
>BTW, I've tested this with Ubuntu samba package 4.1.6, but 
>also with latest git version of samba.
>
>
>
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