Bug 1462746 - Mount "Windows10 Creators Update"-Shares on RHEL6 (SAMBA-AD 4.5 Env with "ntlm auth= no")
Mount "Windows10 Creators Update"-Shares on RHEL6 (SAMBA-AD 4.5 Env with "ntl...
Status: NEW
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: cifs-utils (Show other bugs)
6.9
x86_64 Linux
unspecified Severity medium
: rc
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Assigned To: Ronnie Sahlberg
Filesystem QE
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Depends On:
Blocks:
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Reported: 2017-06-19 08:54 EDT by Tim
Modified: 2017-08-21 16:35 EDT (History)
1 user (show)

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Description Tim 2017-06-19 08:54:47 EDT
Description of problem:
We mount via autofs W10-Shares on our RHEL6 Server.
Since W10-Creators-Update (W10-C-U) and SAMBA 4.5 (NTLMv1 authentication disabled by default) we can't mount shares from clients with W10-C-U.
The option 'sec="ntlmssp"' in mount.cifs won't help.

FYI:
We noticed this problem since we update our SAMBA-AD-Env from 4.4.X to 4.5.10
-> "4.5 NTLMv1 authentication disabled by default"

If we undo the changes from samba 4.5 with "ntlm auth = yes" in smb.conf. We can mount CIFS-Shares on Clients with and without W10-C-U (Of cource sec options is default sec=ntlm in this cifs-kernel-module-version).
But if we set "ntlm auth = no" we can only mount shares from W10-Clients without the W10-C-U and with mount.cifs option 'sec="ntlmssp"'.

Version-Release number of selected component (if applicable):
kernel-firmware-2.6.32-696.3.1.el6.noarch
cifs-utils-4.8.1-20.el6.x86_64

How reproducible:

Steps to Reproduce:
W10-Client with W10-C-U
# mount.cifs -o user=cifs_user,domain=ds,password=PASSWORD,sec=ntlmssp //testclientw10cu/share /mnt/test/ -v
mount.cifs kernel mount options: ip=192.168.1.95,unc=\\testclientw10cu\share,sec=ntlmssp,user=cifs_user,,domain=ds,pass=********
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)


W10-Client without W10-C-U
 mount.cifs -o user=cifs_user,domain=ds,password=PASSWORD,sec=ntlmssp //testclientnow10cu/share /mnt/test/ -v
mount.cifs kernel mount options: ip=192.168.1.102,unc=\\testclientnow10cu\share,sec=ntlmssp,user=cifs_user,,domain=ds,pass=********
-> Share is mounted
Comment 2 Tim 2017-06-19 11:14:09 EDT
With RHEL7 no Problems ;-)

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