Bug 1175710

Summary: Authentication fails when netbios/hostname is longer than MAX_NETBIOSNAME_LEN-1
Product: [Fedora] Fedora Reporter: Harald Reindl <h.reindl>
Component: sambaAssignee: Guenther Deschner <gdeschner>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 20CC: abokovoy, asn, gdeschner, jlayton, madam, martin, sbose, ssorce
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: samba-4.1.15-1.fc20 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-01-17 23:56:12 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Harald Reindl 2014-12-18 12:48:44 UTC
i have here 6 machines with nearly identical configurations - one is in fact a 2 years ago disc clone and only on one machine after update to 4.1.14 login fails

* downgrade
* login works again
* update
* login for every user broken
* downgrade
* works again

reproduced 5 times

check_ntlm_password:  Authentication for user [reindl] -> [reindl] FAILED with error NT_STATUS_NO_SUCH_USER
[2014/12/18 13:22:25.630123,  2] ../source3/auth/auth.c:288(auth_check_ntlm_password)

BTW: while update this crash happens every time

Dec 18 13:33:11 south smbd: /usr/sbin/smbd: /usr/lib64/samba/libwinbind-client.so: version `SAMBA_4.1.12' not found (required by /lib64/libwbclient.so.0)
Dec 18 13:33:11 south systemd: smb.service: control process exited, code=exited status=1
Dec 18 13:33:11 south systemd: Failed to start Samba SMB Daemon.

 server string = fileserver
 netbios name = fileserver

 hosts allow =
 hosts deny = all
 veto files = /.DS_Store/._*/.AppleDB/.AppleDesktop/.AppleDouble/.Parent/.TemporaryItems/Temporary Items/Network Trash Folder/.bin/.FBCIndex/.FBCLockFolder/TheFindByContentFolder/
 delete veto files = yes

 workgroup = LOUNGE
 lm announce = no
 lanman auth = no
 ntlm auth = no
 client lanman auth = no
 client ntlmv2 auth = yes
 multicast dns register = no
 max protocol = SMB3
 client signing = disabled
 store dos attributes = no
 log file = /var/log/samba/samba.log
 log level = 1 all:1 auth:2 passdb:2 tdb:2 vfs:1 smb:1 locking:0 sam:0 winbind:0 idmap:0 quota:0 acls:0 msdfs:0 dmapi:0 registry:0 printdrivers:0 lanman:0 rpc_parse:0 rpc_srv:0 rpc_cli:0
 max log size = 4048
 os level = 0
 domain master = no
 preferred master = no
 local master = no
 disable netbios = yes
 wins support = no
 browse list = no
 dns proxy = no
 name resolve order = lmhosts hosts bcast
 nmbd bind explicit broadcast = no
 remote announce =
 syslog = 0
 syslog only = no
 smb ports = 445 139
 max smbd processes = 50
 max xmit = 32768
 read raw = no
 write raw = no
 getwd cache = yes
 stat cache = yes
 max stat cache size = 512
 use sendfile = yes
 restrict anonymous = 1
 security = user
 invalid users = nobody root admin administrator guest gast pcguest anonymous
 access based share enum = yes
 ldap ssl = no
 server signing = Auto
 time server = no
 unix extensions = no
 show add printer wizard = no
 load printers = no
 printable = no
 printing = bsd
 printcap name = /dev/null
 hide unreadable = yes

 comment = Private Data
 writable = yes
 browseable = no
 valid users = %S
 nt acl support = no
 locking = yes
 oplocks = no
 level2 oplocks = no
 use sendfile = yes
 inherit permissions = yes
 vfs objects = netatalk
 follow symlinks = no
 wide links = no
 hide special files = yes
 strict allocate = yes
 strict sync = no

Comment 1 Harald Reindl 2014-12-18 12:51:04 UTC
P.S: yes i know that i gave karma after upgraded the first machines without any troubles except two remote servers while the last one failed

Comment 2 Guenther Deschner 2014-12-18 12:57:20 UTC
Have you upgraded libwbclient as well ?

Comment 3 Harald Reindl 2014-12-18 12:59:33 UTC

Dec 18 10:32:48 Installed: 2:libwbclient-4.1.14-1.fc20.x86_64
Dec 18 10:32:49 Installed: 2:samba-libs-4.1.14-1.fc20.x86_64
Dec 18 10:32:49 Installed: 2:samba-common-4.1.14-1.fc20.x86_64
Dec 18 10:32:49 Installed: 2:libsmbclient-4.1.14-1.fc20.x86_64
Dec 18 10:32:49 Installed: 2:samba-client-4.1.14-1.fc20.x86_64
Dec 18 10:32:50 Installed: 2:samba-4.1.14-1.fc20.x86_64

Dec 18 13:31:52 Installed: 2:libwbclient-4.1.12-5.fc20.x86_64
Dec 18 13:31:53 Installed: 2:samba-libs-4.1.12-5.fc20.x86_64
Dec 18 13:31:54 Installed: 2:samba-common-4.1.12-5.fc20.x86_64
Dec 18 13:31:54 Installed: 2:libsmbclient-4.1.12-5.fc20.x86_64
Dec 18 13:31:54 Installed: 2:samba-client-4.1.12-5.fc20.x86_64
Dec 18 13:31:54 Installed: 2:samba-4.1.12-5.fc20.x86_64

Dec 18 13:33:09 Updated: 2:libwbclient-4.1.14-1.fc20.x86_64
Dec 18 13:33:11 Updated: 2:samba-libs-4.1.14-1.fc20.x86_64
Dec 18 13:33:11 Updated: 2:samba-common-4.1.14-1.fc20.x86_64
Dec 18 13:33:11 Updated: 2:libsmbclient-4.1.14-1.fc20.x86_64
Dec 18 13:33:11 Updated: 2:samba-client-4.1.14-1.fc20.x86_64
Dec 18 13:33:11 Updated: 2:samba-4.1.14-1.fc20.x86_64

Dec 18 13:34:04 Installed: 2:libwbclient-4.1.12-5.fc20.x86_64
Dec 18 13:34:05 Installed: 2:samba-libs-4.1.12-5.fc20.x86_64
Dec 18 13:34:06 Installed: 2:samba-common-4.1.12-5.fc20.x86_64
Dec 18 13:34:06 Installed: 2:libsmbclient-4.1.12-5.fc20.x86_64
Dec 18 13:34:06 Installed: 2:samba-client-4.1.12-5.fc20.x86_64
Dec 18 13:34:06 Installed: 2:samba-4.1.12-5.fc20.x86_64

Comment 4 Michael Adam 2014-12-18 15:41:46 UTC
Is an old smbd still running by chance?

i.e. unless you are not already doing so:

could you make sure the upgrade process incorporates the following steps:

- stop the samba services
- make sure no smbd / winbindd / nmbd process is running
- upgrade the packages to 4.1.14
- check symbol versions with "nm /lib64/libwbclient.so.0"
  and look out for occurrences of 4.1.12
- start samba
- try login

If the same happens as above, or if the nm check shows 4.1.12
then we have a problem with the binaries/libraries in the pkg.
But since the upgrade works nicely on other servers, I rather
think there is a more likely a problem with the starting/stopping
the daemons during upgrade.


Comment 5 Harald Reindl 2014-12-18 15:58:10 UTC
nm: /lib64/libwbclient.so.0: no symbols

i completly stopped samba multiple times and restarted it at least 30 times by trying to play around with smb.conf (use one from other working machines) and raise/lower logging on the affected machine, deleted *anything* below /var/lib/samba/ and added a new user after that with "smbpasswd"

after 3 hours i gave up, downgraded and all worked with the new password-database as well as with the backups containing the existing users and after another update it pretended again "NT_STATUS_NO_SUCH_USER" which is a different message than "NT_STATUS_WRONG_PASSWORD"

i really have no clue what's going on there nor how it is possible that this affects only one machine but in fact "samba-4.1.12-5.fc20.x86_64" don't have that issue

Comment 6 Sumit Bose 2014-12-18 16:31:16 UTC
Please try

objdump -T /lib64/libwbclient.so.0 | grep SAMBA

instead of nm. 

For me it looks that the update did not remove the old version of the library. Pleae note that in 4.1.14 /lib/libwbclient.* is manages by the alternatives tool which afaik does not remove existing files.

After the update /lib64/libwbclient.so.0.11 should be a link to /etc/alternatives/...  If it is a file it is most probably the old version and yum/rpm was not able to remove it.

Comment 7 Harald Reindl 2014-12-18 16:56:49 UTC
* it is a symlink
* i removed the phyiscal file before update again
* Dec 18 17:51:35 south smbd: /usr/sbin/smbd: error 
  while loading shared libraries: libwbclient.so.0: cannot 
  open shared object file: No such file or directory
* so the upgrade path is borked because smbd restarts
  in the middle fof the yum transaction
* FRANKLY THAT is why i hate this damned automatic restarts
  because i am the once who decides when to restart services
  in case of deploy updates to 30 machines 
* i really don't get why we start with alternatives crap
  in case of libraries

in any case - on that machine 4.1.4 don't work

downgraded again before users kill me and all is fine

that crash happens exatly *once* due upgrade

Dec 18 17:47:56 localhost smbd: /usr/sbin/smbd: error while loading shared libraries: libwbclient.so.0: cannot open shared object file: No such file or directory
Dec 18 17:47:56 localhost systemd: smb.service: control process exited, code=exited status=127
Dec 18 17:47:56 localhost systemd: Failed to start Samba SMB Daemon.

0000000000000000      DF *UND*  0000000000000000  SAMBA_4.1.14 winbindd_free_response
0000000000000000      DF *UND*  0000000000000000  SAMBA_4.1.14 winbindd_request_response
0000000000000000      DF *UND*  0000000000000000  SAMBA_4.1.14 winbindd_priv_request_response

Comment 8 Martin Smith 2015-01-09 10:27:17 UTC
I seem to have this problem as well. I also have several machines and only one is affected. The problem started as soon as the 4.1.14 update was installed. An active connection from a Windows machine stopped working and I could not authenticate it again.

They all have fairly basic SMB configurations - standalone servers with a small number of shares and users.

The machines that work are older installs and are still using an smbpasswd file.

The affected machine will not accept logins. I get NT_STATUS_NO_SUCH_USER. The user is in the tdbsam database and prior to the update everything was working.

The library file mentioned above is a symlink. I have verified the samba RPMS and they are ok. I have spent several hours troubleshooting and have not identified the problem.

Local connection fails:

smbclient //localhost/video -U martin
Enter martin's password: *********
session setup failed: NT_STATUS_LOGON_FAILURE

Samba log snippet:

[2015/01/09 10:19:44.982150,  3] ../source3/auth/auth.c:177(auth_check_ntlm_password)
  check_ntlm_password:  Checking password for unmapped user [MYGROUP]\[martin]@[ANALYTICAL-ENGINE] with the new password interface
[2015/01/09 10:19:44.982187,  3] ../source3/auth/auth.c:180(auth_check_ntlm_password)
  check_ntlm_password:  mapped user is: [ANALYTICAL-ENGINE]\[martin]@[ANALYTICAL-ENGINE]
[2015/01/09 10:19:44.982221,  2] ../source3/auth/auth.c:288(auth_check_ntlm_password)
  check_ntlm_password:  Authentication for user [martin] -> [martin] FAILED with error NT_STATUS_NO_SUCH_USER
[2015/01/09 10:19:44.982266,  2] ../auth/gensec/spnego.c:743(gensec_spnego_server_negTokenTarg)

pdbedit output:

Module 'tdbsam' loaded
Unix username:        martin
NT username:          
Account Flags:        [U          ]
User SID:             S-1-5-21-807222276-2518046738-2387355048-1005
Primary Group SID:    S-1-5-21-807222276-2518046738-2387355048-513
Full Name:            Martin
Home Directory:       \\analytical-engine\martin
HomeDir Drive:        
Logon Script:         
Profile Path:         \\analytical-engine\martin\profile
Account desc:         
Munged dial:          
Logon time:           0
Logoff time:          Wed, 06 Feb 2036 15:06:39 GMT
Kickoff time:         Wed, 06 Feb 2036 15:06:39 GMT
Password last set:    Fri, 09 Jan 2015 09:27:22 GMT
Password can change:  Fri, 09 Jan 2015 09:27:22 GMT
Password must change: never
Last bad password   : 0
Bad password count  : 0

# ls -l /lib64/libwbclient.so.0.11
lrwxrwxrwx. 1 root root 40 Jan  8 11:33 /lib64/libwbclient.so.0.11 -> /etc/alternatives/libwbclient.so.0.11-64

# rpm --verify samba samba-common samba-libs libwbclient
S.5....T.  c /etc/samba/smb.conf

Comment 9 Martin Smith 2015-01-09 12:34:18 UTC
I think the answer is here:


4.1.14 appears to have changed the way long server names are handled. Previously they were not truncated, now they are. This causes a check for local name to fail. It's visible with auth logging set to 10.

I have manually set a short netbios name in the config and the shares are now accessible.

Comment 10 Harald Reindl 2015-01-09 13:12:27 UTC
indeed - the servername in smb.conf had 16 chars, changed to one with 5 chars and login works also with 4.1.14 - Aaaaaargh

Comment 11 Andreas Schneider 2015-01-12 17:15:01 UTC
I've proposed a patch to fix this issue upstream.

Comment 12 Fedora Update System 2015-01-14 07:51:05 UTC
samba-4.1.15-1.fc20 has been submitted as an update for Fedora 20.

Comment 13 Fedora Update System 2015-01-14 07:52:33 UTC
samba-4.1.15-1.fc21 has been submitted as an update for Fedora 21.

Comment 14 Fedora Update System 2015-01-14 23:55:47 UTC
Package samba-4.1.15-1.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing samba-4.1.15-1.fc20'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 15 Fedora Update System 2015-01-17 23:56:12 UTC
samba-4.1.15-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 16 Fedora Update System 2015-01-26 02:30:36 UTC
samba-4.1.15-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.