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L.P.H. van Belle

2017-Jun-20 09:13 UTC

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

Hai Baptiste,

What you can try;
Type: 
ktutil (enter)
rkt /etc/krb5.keytab 
rkt /var/lib/samba/private/krb5.keytab 
list

Now check if you see, 
host/server.internal.domain.tld at REALM
host/server at REALM
(same (both) for nfs/.. at REALM) 

And 
NETBIOSNAME$@REALM

If you see all, you can write this back to a new file. 
wkt /etc/krb5.keytab.new1
And if needed you can also cleanup the keytab file before writing. 

Now choose, of 
dedicated keytab file = /etc/krb5.keytab 

Or use the samba default in /var/lib/samba/private/krb5.keytab 
In case of the samba default 
rm /etc/krb5.keytab 
ln -sf /usr/local/samba/private/krb5.conf /etc/krb5.conf

Some extra info on the keytab things. 
https://wiki.samba.org/index.php/Generating_Keytabs 
https://wiki.samba.org/index.php/Keytab_Extraction 




Greetz, 

Louis


> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Prunk Dump via samba
> Verzonden: dinsdag 20 juni 2017 10:58
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] DRS stopped working after upgrade from 
> debian Jessie to Stretch
> 
> Thanks for the help !!!
> 
> 2017-06-19 23:58 GMT+02:00 Andrew Bartlett <abartlet at samba.org>:
> > On Mon, 2017-06-19 at 22:13 +0200, Prunk Dump via samba wrote:
> >> Hello Samba team !
> >>
> >> I'am in a very delicate situation. After an upgrade to 
> debian Stretch 
> >> my DRS stopped working.
> >
> > Have you ever had MIT krb5 installed, or is krb5kdc now running?
> >
> > Samba doesn't use /etc/krb5.keytab, so this may be related to some
> > previous install (or may be related to how you are trying 
> to use NFS).
> >
> >
> 
> I have checked, MIT kerberos is not installed, just the
"krb5-user"
> kerberos client package.
> 
> >>
> >> This seem to be a computer account problem. But I can't find
any
> >> problem in Kerberos :
> >>
> >>
> >>  --------------------------------
> >> # kinit -k FICHDC$
> >> # klist
> >> Ticket cache: FILE:/tmp/krb5cc_0
> >> Default principal: FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
> >
> > Can you do this against the secrets.keytab in Samba's private/
dir?
> >
> > You can reset the Samba machine account pw with 
> > ./source4/scripting/devel/chgtdcpass, but:
> >  - it wont be packaged so you will have to build Samba and 
> tell it to 
> > operate against the right paths
> >  - it shouldn't be needed, upgrades shouldn't break this, and 
> > understanding the root cause would be better
> >
> > Does 'samba-tool time -P' work?  It is any different with 
> 'samba-tool 
> > time -P -k no'?  (It seems you issue is related primarily 
> to kerberos 
> > and a keytab out of sync somehow).
> >
> 
> Yes you're right ! I need to understand the root of the 
> problem as I have some other DC to upgrade the same manner. 
> And you're right authentication with the private keytab does 
> not work. But strangely it works with /etc/krb5.keytab.
> 
> --------------------------------
> --------------------------------
> ~# klist -e -k /var/lib/samba/private/secrets.keytab
> Keytab name: FILE:/var/lib/samba/private/secrets.keytab
> KVNO Principal
> ---- 
> --------------------------------------------------------------
> ------------
>    1 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
>    1 
> HOST/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GU
> ILLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-crc)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
>    1 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
>    1 
> HOST/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GU
> ILLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-md5)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
>    1 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR 
> (arcfour-hmac)
>    1 
> HOST/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GU
> ILLAUME-FICHET.AC-GRENOBLE.FR
> (arcfour-hmac)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
>    1 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
> (aes128-cts-hmac-sha1-96)
>    1 
> HOST/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GU
> ILLAUME-FICHET.AC-GRENOBLE.FR
> (aes128-cts-hmac-sha1-96)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR 
> (aes128-cts-hmac-sha1-96)
>    1 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
> (aes256-cts-hmac-sha1-96)
>    1 
> HOST/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GU
> ILLAUME-FICHET.AC-GRENOBLE.FR
> (aes256-cts-hmac-sha1-96)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR 
> (aes256-cts-hmac-sha1-96)
> 
> 
> ~# kinit -V -k -t /var/lib/samba/private/secrets.keytab 
> FICHDC$ Using default cache: /tmp/krb5cc_0 Using principal: 
> FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
> Using keytab: /var/lib/samba/private/secrets.keytab
> kinit: Preauthentication failed while getting initial credentials
> 
> ~# samba-tool time -P
> ldb_wrap open of secrets.ldb
> GENSEC backend 'gssapi_spnego' registered GENSEC backend 
> 'gssapi_krb5' registered GENSEC backend 'gssapi_krb5_sasl' 
> registered GENSEC backend 'spnego' registered GENSEC backend 
> 'schannel' registered GENSEC backend 'naclrpc_as_system' 
> registered GENSEC backend 'sasl-EXTERNAL' registered GENSEC 
> backend 'ntlmssp' registered GENSEC backend 
> 'ntlmssp_resume_ccache' registered GENSEC backend 
> 'http_basic' registered GENSEC backend 'http_ntlm'
registered
> GENSEC backend 'krb5' registered GENSEC backend 
> 'fake_gssapi_krb5' registered
> resolve_lmhosts: Attempting lmhosts lookup for name 
> fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr<0x20>
> Wrong username or password: kinit for
> FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR failed 
> (Preauthentication failed)
> 
> SPNEGO(gssapi_krb5) NEG_TOKEN_INIT failed: 
> NT_STATUS_LOGON_FAILURE Failed initial gensec_update with 
> mechanism spnego: NT_STATUS_LOGON_FAILURE
> ERROR(runtime): uncaught exception - (-1073741715, 
> "Connection to SRVSVC pipe of server 
> 'fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr'
> failed: NT_STATUS_LOGON_FAILURE")
>   File
"/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py",
> line 176, in _run
>     return self.run(*args, **kwargs)
>   File
"/usr/lib/python2.7/dist-packages/samba/netcmd/nettime.py",
> line 59, in run
>     self.outf.write(net.time(server_name)+"\n")
> 
> ~# samba-tool time -P -k no
> ldb_wrap open of secrets.ldb
> GENSEC backend 'gssapi_spnego' registered GENSEC backend 
> 'gssapi_krb5' registered GENSEC backend 'gssapi_krb5_sasl' 
> registered GENSEC backend 'spnego' registered GENSEC backend 
> 'schannel' registered GENSEC backend 'naclrpc_as_system' 
> registered GENSEC backend 'sasl-EXTERNAL' registered GENSEC 
> backend 'ntlmssp' registered GENSEC backend 
> 'ntlmssp_resume_ccache' registered GENSEC backend 
> 'http_basic' registered GENSEC backend 'http_ntlm'
registered
> GENSEC backend 'krb5' registered GENSEC backend 
> 'fake_gssapi_krb5' registered
> resolve_lmhosts: Attempting lmhosts lookup for name 
> fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr<0x20>
> Got challenge flags:
> Got NTLMSSP neg_flags=0x62898215
> NTLMSSP: Set final flags:
> Got NTLMSSP neg_flags=0x62088215
> NTLMSSP Sign/Seal - Initialising with flags:
> Got NTLMSSP neg_flags=0x62088215
> ERROR(runtime): uncaught exception - (-1073741715, 
> "Connection to SRVSVC pipe of server 
> 'fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr'
> failed: NT_STATUS_LOGON_FAILURE")
>   File
"/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py",
> line 176, in _run
>     return self.run(*args, **kwargs)
>   File
"/usr/lib/python2.7/dist-packages/samba/netcmd/nettime.py",
> line 59, in run
>     self.outf.write(net.time(server_name)+"\n")
> 
> ~# klist -e -k /etc/krb5.keytab
> Keytab name: FILE:/etc/krb5.keytab
> KVNO Principal
> ---- 
> --------------------------------------------------------------
> ------------
>    1 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-crc)
>    1 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-md5)
>    1 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (arcfour-hmac)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
>    2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
>    2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
>    2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
>    2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR 
> (aes128-cts-hmac-sha1-96)
>    2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR 
> (aes256-cts-hmac-sha1-96)
>    2 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-crc)
>    2 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (des-cbc-md5)
>    2 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (arcfour-hmac)
>    2 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (aes128-cts-hmac-sha1-96)
>    2 
> nfs/fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr at NET.LYC-GUI
> LLAUME-FICHET.AC-GRENOBLE.FR
> (aes256-cts-hmac-sha1-96)
> 
> ~# kinit -k -t /etc/krb5.keytab FICHDC$
> 
> --------------------------------
> --------------------------------
> 
> I don't know what is "KVNO". But on the
"/etc/krb5.keytab"
> there is "1" and "2" FICHDC$ principals entries. But on
> "/var/lib/samba/private/secret.keytab" there is only
"1".
> 
> And on the samba log file I have :
> 
> --------------------------------
> GSS server Update(krb5)(1) Update failed:  Miscellaneous failure (see
> text): Failed to find
> FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR(kvno 2) in 
> keytab FILE:/var/lib/samba/private/secrets.keytab (arcfour-hmac-md5)
> --------------------------------
> 
> How "/var/lib/samba/private/secrets.keytab" is updated by samba ?
> 
> Thank you very much for the help !
> 
> Baptiste.
> 
> --
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
>

Rowland Penny

2017-Jun-20 09:37 UTC

head link

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

On Tue, 20 Jun 2017 11:13:25 +0200
"L.P.H. van Belle via samba" <samba at lists.samba.org> wrote:

If you check what the OP posted from:

klist -e -k /var/lib/samba/private/secrets.keytab

There is this in reference to his DC:

   1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
   1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
   1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
   1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (aes128-cts-hmac-sha1-96)
   1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (aes256-cts-hmac-sha1-96)

Amongst his previous output was this:

GSS server Update(krb5)(1) Update failed:  Miscellaneous failure (see text): 
Failed to find FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR(kvno 2) in keytab
FILE:/var/lib/samba/private/secrets.keytab (arcfour-hmac-md5)

I can see FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR in the output above,
but I do not see 'arcfour-hmac-md5'

Rowland

Andrew Bartlett

2017-Jun-20 10:31 UTC

head link

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

On Tue, 2017-06-20 at 11:13 +0200, L.P.H. van Belle via samba
wrote:> Now choose, of 
> dedicated keytab file = /etc/krb5.keytab 
To be clear, this parameter is not used in the AD DC.

Thanks,

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba

Prunk Dump

2017-Jun-20 10:52 UTC

head link

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

2017-06-20 11:37 GMT+02:00 Rowland Penny via samba <samba at
lists.samba.org>:> On Tue, 20 Jun 2017 11:13:25 +0200
> "L.P.H. van Belle via samba" <samba at lists.samba.org>
wrote:
>
> If you check what the OP posted from:
>
> klist -e -k /var/lib/samba/private/secrets.keytab
>
> There is this in reference to his DC:
>
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
(aes128-cts-hmac-sha1-96)
>    1 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR
(aes256-cts-hmac-sha1-96)
>
> Amongst his previous output was this:
>
> GSS server Update(krb5)(1) Update failed:  Miscellaneous failure (see
text):
> Failed to find FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR(kvno 2) in
keytab
> FILE:/var/lib/samba/private/secrets.keytab (arcfour-hmac-md5)
>
> I can see FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR in the output
above,
> but I do not see 'arcfour-hmac-md5'
>
> Rowland
>
> --
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba

I have regenerated one keytab for "FICHDC$" and
"HOST/fichdc"
principals and copied the keytab file in both "/etc/krb5.keytab" and
"/var/lib/samba/private/secrets.keytab" by security (I have made
backup of old keytab files). But authentication with machine account
still not works :

----------------------------
~# samba-tool domain exportkeytab /tmp/krb5.keytab
--principal="FICHDC$"
~# samba-tool domain exportkeytab /tmp/krb5.keytab
--principal="HOST/fichdc"
~# klist -e -k /tmp/krb5.keytab
Keytab name: FILE:/tmp/krb5.keytab
KVNO Principal
---- --------------------------------------------------------------------------
   2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
   2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
   2 FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)
   2 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (arcfour-hmac)
   2 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-md5)
   2 HOST/fichdc at NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR (des-cbc-crc)

~# cp /tmp/krb5.keytab /etc/krb5.keytab
~# cp /tmp/krb5.keytab /var/lib/samba/private/secrets.keytab
~# systemctl restart samba-ad-dc
~# samba-tool time -P
ldb_wrap open of secrets.ldb
GENSEC backend 'gssapi_spnego' registered
GENSEC backend 'gssapi_krb5' registered
GENSEC backend 'gssapi_krb5_sasl' registered
GENSEC backend 'spnego' registered
GENSEC backend 'schannel' registered
GENSEC backend 'naclrpc_as_system' registered
GENSEC backend 'sasl-EXTERNAL' registered
GENSEC backend 'ntlmssp' registered
GENSEC backend 'ntlmssp_resume_ccache' registered
GENSEC backend 'http_basic' registered
GENSEC backend 'http_ntlm' registered
GENSEC backend 'krb5' registered
GENSEC backend 'fake_gssapi_krb5' registered
resolve_lmhosts: Attempting lmhosts lookup for name
fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr<0x20>
Wrong username or password: kinit for
FICHDC$@NET.LYC-GUILLAUME-FICHET.AC-GRENOBLE.FR failed
(Preauthentication failed)

SPNEGO(gssapi_krb5) NEG_TOKEN_INIT failed: NT_STATUS_LOGON_FAILURE
Failed initial gensec_update with mechanism spnego: NT_STATUS_LOGON_FAILURE
ERROR(runtime): uncaught exception - (-1073741715, "Connection to
SRVSVC pipe of server 'fichdc.net.lyc-guillaume-fichet.ac-grenoble.fr'
failed: NT_STATUS_LOGON_FAILURE")
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py",
line 176, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/nettime.py",
line 59, in run
    self.outf.write(net.time(server_name)+"\n")
----------------------------

The possible problem is that "KVNO" is still at "2" and
there is no
"aes128-cts-hmac-sha1-96" and "aes256-cts-hmac-sha1-96"
encryption.
But I don't how to generate there encryptions with samba tool. What
account need to be put in "net ads enctypes set <ACCOUNTNAME>" ?

Thank you very much for your help !!!

Baptiste.

L.P.H. van Belle

2017-Jun-20 11:19 UTC

head link

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

Hai Andrew, 

Thanks, for that info, i didnt know that. 
Just a thought..  Separate the config paramters per type, makes it much better
readable.
Like : 
man smb.conf.ad 
man smb.conf.member
man smb.conf for all paramters. 


Greetz, 

Louis


 
> -----Oorspronkelijk bericht-----
> Van: Andrew Bartlett [mailto:abartlet at samba.org] 
> Verzonden: dinsdag 20 juni 2017 12:31
> Aan: L.P.H. van Belle; samba at lists.samba.org
> Onderwerp: Re: [Samba] DRS stopped working after upgrade from 
> debian Jessie to Stretch
> 
> On Tue, 2017-06-20 at 11:13 +0200, L.P.H. van Belle via samba wrote:
> > Now choose, of
> > dedicated keytab file = /etc/krb5.keytab
> 
> To be clear, this parameter is not used in the AD DC.
> 
> Thanks,
> 
> Andrew Bartlett
> 
> -- 
> Andrew Bartlett                       http://samba.org/~abartlet/
> Authentication Developer, Samba Team  http://samba.org
> Samba Developer, Catalyst IT          
> http://catalyst.net.nz/services/samba
> 
>

Rowland Penny

2017-Jun-20 11:22 UTC

head link

[Samba] DRS stopped working after upgrade from debian Jessie to Stretch

On Tue, 20 Jun 2017 22:31:02 +1200
Andrew Bartlett via samba <samba at lists.samba.org> wrote:
> On Tue, 2017-06-20 at 11:13 +0200, L.P.H. van Belle via samba wrote:
> > Now choose, of 
> > dedicated keytab file = /etc/krb5.keytab 
> 
> To be clear, this parameter is not used in the AD DC.
> 
> Thanks,
> 
> Andrew Bartlett
> 
Shouldn't that be 'this parameter should not be added to smb.conf on an
AD DC.'

You can have a keytab called 'krb5.keytab' in /etc, it just isn't
used
in authentication by the AD DC.

Just trying to clarify this ;-)

Rowland

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