[Samba] Samba 4.6.2 member server errors
L.P.H. van Belle
belle at bazuin.nl
Mon Oct 16 14:58:20 UTC 2017
Hi Tom,
Small update.
I'am also still looking into this but im not getting much futher..
I am just reading :
https://blogs.msdn.microsoft.com/openspecification/2009/12/31/verifying-the-server-signature-in-kerberos-privilege-account-certificate/
Bit older but, im trying to understand more what happens here.
And the only "guess" i can make here is .
A kerberos ticket, with the wrong encryption type tried to validate.
Base on that, but again, this is what i would try.
For all servers in krb5.conf. (* do you have any xp/w2003 or older in you lan ? )
; for Windows 2008 with AES
; default_tgs_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
; default_tkt_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
; permitted_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
Or at least make sure they are the same.
Run net cache flush on all server and reboot them.
Of a wrong verifcation is somewhere in cache or memory, then this could help.
Now,
> I do not know if it is important or not but these machines
> were just joined to the domain within the last week or so.
Yes, very important, because .. Whats the default time for a kerberos ticket.
The default value for a TGT (also referred to as a user ticket) is 7 days, ...
And a computer is a user..
So we are imo getting in the right direction.
.... Still reading things here
Greetz,
Louis
> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Tom
> Diehl via samba
> Verzonden: maandag 16 oktober 2017 16:41
> Aan: Rowland Penny
> CC: samba at lists.samba.org
> Onderwerp: Re: [Samba] Samba 4.6.2 member server errors
>
> Hi Rowland,
>
>
> On Sun, 15 Oct 2017, Rowland Penny via samba wrote:
>
> > On Sun, 15 Oct 2017 13:38:13 -0400 (EDT)
> > me at tdiehl.org wrote:
> >
> >> Yes I understand, however, there are 2 things I am concerned about.
> >>
> >> When the errors are spewing, winbind never goes to sleep
> and the load
> >> on the server runs somewhere between 6-8 constantly (as shown by
> >> top.). Even when there is no one in the office and hence no files
> >> being served I still see the high load.
> >>
> >> When the errors stop (This happens intermittently) winbind
> will sleep
> >> and the load settles down to < 1.
> >>
> >> The other thing that concerns me is that I am wondering if
> this is an
> >> indication that something more serious is about to break. It is one
> >> thing for me to see things in the background and entirely something
> >> else for it to impact the users. :-)
> >>
> >> Suggestions?
> >>
> >> Regards,
> >>
> >
> > If nothing is connecting, then winbind shouldn't be doing
> much, so if
> > it is, you need to find out why.
> >
> > Check the Samba logs on the DCs, is there anything relevant
> showing at
> > the time that winbind is overloading on the domain member
> > Raise the log levels on the DCs and domain members and see
> if anything
> > pops out.
>
> I ran the logging up to level 10 on the DC's and the file server.
> The DC's do not show anything significant, at least not that
> I can tell.
> There is so much info there I might be missing something.
>
> On the file server I see the following at level 10:
>
> [2017/10/16 10:11:21.392833, 6, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd.c:919(new_connection)
> accepted socket 44
> [2017/10/16 10:11:21.392850, 10, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd.c:734(process_request)
> process_request: Handling async request 58214:GETPWNAM
> [2017/10/16 10:11:21.392857, 3, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd_getpwnam.c:56(winbindd_getpwnam_send)
> getpwnam kmg\mb-shop9-17$
> [2017/10/16 10:11:21.392868, 1, pid=1440, effective(0, 0),
> real(0, 0)] ../librpc/ndr/ndr.c:450(ndr_print_function_debug)
> wbint_LookupName: struct wbint_LookupName
> in: struct wbint_LookupName
> domain : *
> domain : 'KMG'
> name : *
> name : 'MB-SHOP9-17$'
> flags : 0x00000008 (8)
> [2017/10/16 10:11:21.392899, 1, pid=1440, effective(0, 0),
> real(0, 0)] ../librpc/ndr/ndr.c:450(ndr_print_function_debug)
> wbint_LookupName: struct wbint_LookupName
> out: struct wbint_LookupName
> type : *
> type : SID_NAME_USER (1)
> sid : *
> sid :
> S-1-5-21-3052942767-4183929206-737583365-1617
> result : NT_STATUS_OK
> [2017/10/16 10:11:21.392926, 10, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/wb_sids2xids.c:113(wb_sids2xids_send)
> SID 0: S-1-5-21-3052942767-4183929206-737583365-1617
> [2017/10/16 10:11:21.392939, 10, pid=1440, effective(0, 0),
> real(0, 0)]
> ../source3/lib/idmap_cache.c:56(idmap_cache_find_sid2unixid)
> Parsing value for key
> [IDMAP/SID2XID/S-1-5-21-3052942767-4183929206-737583365-1617]:
> value=[-1:N]
> [2017/10/16 10:11:21.392946, 10, pid=1440, effective(0, 0),
> real(0, 0)]
> ../source3/lib/idmap_cache.c:75(idmap_cache_find_sid2unixid)
> Parsing value for key
> [IDMAP/SID2XID/S-1-5-21-3052942767-4183929206-737583365-1617]:
> id=[4294967295], endptr=[:N]
> [2017/10/16 10:11:21.392955, 5, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd_getpwnam.c:137(winbindd_getpwnam_recv)
> Could not convert sid
> S-1-5-21-3052942767-4183929206-737583365-1617: NT_STATUS_NO_SUCH_USER
> [2017/10/16 10:11:21.392963, 10, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd.c:796(wb_request_done)
> wb_request_done[58214:GETPWNAM]: NT_STATUS_NO_SUCH_USER
> [2017/10/16 10:11:21.392982, 10, pid=1440, effective(0, 0),
> real(0, 0), class=winbind]
> ../source3/winbindd/winbindd.c:734(process_request)
> process_request: Handling async request 58217:PAM_AUTH_CRAP
> [2017/10/16 10:11:21.912764, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.912829, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.912865, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.912935, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.912976, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913011, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913047, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913079, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913124, 2, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:96(check_pac_checksum)
> check_pac_checksum: PAC Verification failed: Decrypt
> integrity check failed (-1765328353)
> [2017/10/16 10:11:21.913139, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Decrypt integrity check failed
> [2017/10/16 10:11:21.913203, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913243, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913281, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913316, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913353, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913392, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913431, 5, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:347(kerberos_decode_pac)
> PAC Decode: Failed to verify the service signature:
> Invalid argument
> [2017/10/16 10:11:21.913475, 3, pid=1440, effective(0, 0),
> real(0, 0)] ../auth/kerberos/kerberos_pac.c:409(kerberos_decode_pac)
> Found account name from PAC: MB-RECEPTION-17$ []
>
> I do not know if it is important or not but these machines
> were just joined
> to the domain within the last week or so.
>
> I see many of these for different machines.
>
> Please let me know what you think.
>
> Regards,
>
>
> --
> Tom me at tdiehl.org
>
> --
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