Re: [PLUG] Mount cifs share from fstab.

[Smith, Cathy]

I work in a multi-user environment where authentication is performed by 
Kerberos.  So all user accounts in the Active Directory domain, use their AD 
password to login to the Linux servers.   The Linux server is configured as a 
samba server.   We run Red Hat here.   I just have a basic samba server 
configuration running on the Linux server.  I don't have to have the account's 
password specified as long as the account is in the AD domain.  We only use the 
.sambpass file for non-AD accounts.  Those account must have a local password 
entry on the Linux server.

Cathy
-- 
Cathy L. Smith
IT Engineer

Pacific Northwest National Laboratory
Operated by Battelle for the 
U.S. Department of Energy

Phone: 509.375.2687
Fax:       509.375.4399
Email: cathy.sm...@pnnl.gov



-Original Message-
From: plug-boun...@pdxlinux.org [mailto:plug-boun...@pdxlinux.org] On Behalf Of 
Tomas Kuchta
Sent: Monday, December 04, 2017 4:35 PM
To: Portland Linux/Unix Group <plug@pdxlinux.org>
Subject: Re: [PLUG] Mount cifs share from fstab.

When you put SMB password into root RO file, it is not secure locally, but it 
is not transmitted over the network in the plain text as far as I know.

In my experience, SMB/CIFS is quie painful to use in multi user, multi machine 
world without domain compatible single sign of.

To be fair, same goes for NFS with Kerberos, if you cannot live without server 
side authentication.

Off topic:
In my opinion - single sign on should be basic stuff done by any ..nix 
household chiefdom setup for both Linux and Windows. Once working, it makes 
huge difference in usability and security. And it currently keeps M$ away from 
local network resource scans.

-T

On Dec 4, 2017 3:47 PM, "David" <dafr+p...@dafr.us> wrote:

> On 12/04/2017 03:36 PM, michael wrote:
>
>> On 2017-12-04 17:00, David wrote:
>>
>>> On 12/04/2017 02:33 PM, michael wrote:
>>>
>>>> I have it working.  I don't want the password for the owner of the 
>>>> share in plain text in a file though.  Creating /home/pi/.smbpasswd 
>>>> with the contents:
>>>> username=Test
>>>> password=password
>>>> domain=somedomain
>>>> and chmod 600 isn't good enough.
>>>>
>>>> The password should be salted in this file even if it is password!
>>>>
>>>> Is there a simple way to use an smbpasswd file properly salted 
>>>> without implementing a full samba server?
>>>>
>>>
>>> The proper tool that I know of is "smbpasswd" as an executable, 
>>> which is part of the samba-common-bin package on my system (Debian).
>>>
>>> It may have dependencies which includes a full smb server (which I 
>>> run), so this may not be helpful information.
>>>
>>> dafr
>>>
>>
>
>> I am most concerned about the password having to be in plaintext when 
>> transmitted over the network.  Even if there is a way without a full 
>> samba server deployment to have the password sent in encrypted form 
>> over the network, that would be great.  The server is probably the 
>> latest incarnation of Windows server.  I don't like the idea of 
>> having to have a Linux user for every Windows user either.
>>
>
>
>
> Sure, I get that, and agree with the concerns. I was looking at the 
> smbpasswd man page initially and this is why I think you want to use 
> this
> utility:
>
>   "On a UNIX machine the encrypted SMB
>passwords are usually stored in the smbpasswd(5) file."
>
> Now, the problem with the utility is that unless you do something 
> fancy, you may have to be on the localhost where the share is exported 
> to set / reset the password as a user. This may not be feasible in 
> your situation unless there is a web interface that you can front 
> smbpasswd with to allow users to change passwords.
>
> When mounting a share in a Windows VM on my Linux host, I have to auth 
> with a pop-up window of user / pass to access the shared directory. 
> I'm not sure if (and don't believe that) you have to have a Linux 
> account for the Windows user. They are different password files, but 
> my experience is also limited to a full samba server, so your needs 
> may be more an issue than mine.
>
> dafr
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Re: [PLUG] Mount cifs share from fstab.

[Tomas Kuchta]

When you put SMB password into root RO file, it is not secure locally, but
it is not transmitted over the network in the plain text as far as I know.

In my experience, SMB/CIFS is quie painful to use in multi user, multi
machine world without domain compatible single sign of.

To be fair, same goes for NFS with Kerberos, if you cannot live without
server side authentication.

Off topic:
In my opinion - single sign on should be basic stuff done by any ..nix
household chiefdom setup for both Linux and Windows. Once working, it makes
huge difference in usability and security. And it currently keeps M$ away
from local network resource scans.

-T

On Dec 4, 2017 3:47 PM, "David"  wrote:

> On 12/04/2017 03:36 PM, michael wrote:
>
>> On 2017-12-04 17:00, David wrote:
>>
>>> On 12/04/2017 02:33 PM, michael wrote:
>>>
 I have it working.  I don't want the password for the owner of the
 share in plain text in a file though.  Creating
 /home/pi/.smbpasswd with the contents:
 username=Test
 password=password
 domain=somedomain
 and chmod 600 isn't good enough.

 The password should be salted in this file even if it is password!

 Is there a simple way to use an smbpasswd file properly salted without
 implementing a full samba server?

>>>
>>> The proper tool that I know of is "smbpasswd" as an executable, which
>>> is part of the samba-common-bin package on my system (Debian).
>>>
>>> It may have dependencies which includes a full smb server (which I
>>> run), so this may not be helpful information.
>>>
>>> dafr
>>>
>>
>
>> I am most concerned about the password having to be in plaintext when
>> transmitted over the network.  Even if
>> there is a way without a full samba server deployment to have the
>> password sent in encrypted form over the
>> network, that would be great.  The server is probably the latest
>> incarnation of Windows server.  I don't
>> like the idea of having to have a Linux user for every Windows user
>> either.
>>
>
>
>
> Sure, I get that, and agree with the concerns. I was looking at the
> smbpasswd man page initially and this is why I think you want to use this
> utility:
>
>   "On a UNIX machine the encrypted SMB
>passwords are usually stored in the smbpasswd(5) file."
>
> Now, the problem with the utility is that unless you do something fancy,
> you may have to be on the localhost where the share is exported to set /
> reset the password as a user. This may not be feasible in your situation
> unless there is a web interface that you can front smbpasswd with to allow
> users to change passwords.
>
> When mounting a share in a Windows VM on my Linux host, I have to auth
> with a pop-up window of user / pass to access the shared directory. I'm not
> sure if (and don't believe that) you have to have a Linux account for the
> Windows user. They are different password files, but my experience is also
> limited to a full samba server, so your needs may be more an issue than
> mine.
>
> dafr
> ___
> PLUG mailing list
> PLUG@pdxlinux.org
> http://lists.pdxlinux.org/mailman/listinfo/plug
>
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Re: [PLUG] Mount cifs share from fstab.

[David]

On 12/04/2017 03:36 PM, michael wrote:

On 2017-12-04 17:00, David wrote:

On 12/04/2017 02:33 PM, michael wrote:
I have it working.  I don't want the password for the owner of the 
share in plain text in a file though.  Creating

/home/pi/.smbpasswd with the contents:
username=Test
password=password
domain=somedomain
and chmod 600 isn't good enough.

The password should be salted in this file even if it is password!

Is there a simple way to use an smbpasswd file properly salted 
without implementing a full samba server?


The proper tool that I know of is "smbpasswd" as an executable, which
is part of the samba-common-bin package on my system (Debian).

It may have dependencies which includes a full smb server (which I
run), so this may not be helpful information.

dafr




I am most concerned about the password having to be in plaintext when 
transmitted over the network.  Even if
there is a way without a full samba server deployment to have the 
password sent in encrypted form over the
network, that would be great.  The server is probably the latest 
incarnation of Windows server.  I don't

like the idea of having to have a Linux user for every Windows user either.




Sure, I get that, and agree with the concerns. I was looking at the 
smbpasswd man page initially and this is why I think you want to use 
this utility:


  "On a UNIX machine the encrypted SMB
   passwords are usually stored in the smbpasswd(5) file."

Now, the problem with the utility is that unless you do something fancy, 
you may have to be on the localhost where the share is exported to set / 
reset the password as a user. This may not be feasible in your situation 
unless there is a web interface that you can front smbpasswd with to 
allow users to change passwords.


When mounting a share in a Windows VM on my Linux host, I have to auth 
with a pop-up window of user / pass to access the shared directory. I'm 
not sure if (and don't believe that) you have to have a Linux account 
for the Windows user. They are different password files, but my 
experience is also limited to a full samba server, so your needs may be 
more an issue than mine.


dafr
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