Mounting your Nikhef home directory using SSH

for Windows Vista/7

Introduction

This tutorial contains screenshots for the English version of Windows Vista.

It has been confirmed that these instructions also work for Windows 7.

The instructions for Windows 2000/XP are also still available.

To be able to mount a Windows share over SSH we will need

• Administrator access to the local computer, including the ability to

  elevate privileges. If you don’t know what I am talking about then

  stop reading right here.

• PuTTY v0.58+,

  which is an excellent and free implementation of SSH for Windows.

  It is assumed that you are familiar with the PuTTY user interface.

• One real or virtual network adapter, bound to the Client for Microsoft Networks

  driver.

  Normally you should already have such an adapter, as otherwise you

  would not be able to mount any Windows shares.

• One real or virtual network adapter, NOT bound to the

  Client for Microsoft Networks driver.

Note that this is slightly different from the requirements for Windows 2000/XP,

as with Vista/7 a different protocol driver (SMB) is used compared to the

older versions of Windows (Netbios over TCP/IP or CIFS).

This part of the tutorial is split into the following steps:

1. As most people do not have a spare real network adapter in their computer,

   we will add an extra virtual network adapter by

   installing the

   Microsoft Loopback Adapter.

2. After that, the network adapter must be properly

   configured.

3. Furthermore, a Windows system driver needs to be

   tweaked.

4. And we need to create a Task for the

   Windows Task Scheduler.

5. Reboot Windows and verify that all changes were

   applied successfully.

6. Then we set up a special

   PuTTY session with the right port-forwarding.

7. Finally, we start PuTTY and mount our Nikhef home

   directory.

8. For those wishing to undo the above steps follow the

   instructions at the bottom of this tutorial.

Installing the Loopback Adapter

To install the Loopback adapter follow these steps:

• Start the Add Hardware Wizard by either going

  Start->Settings->Control Panel->Add Hardware or by

  starting a console window with elevated (Administrator) privileges.

  In the console window type

    hdwwiz.exe
  

  The Hardware Wizard will come up:

  

• Click Next to continue:

  

  Select Install the hardware that I manually select from a list

  and click Next.

• Now you’ll see:

  

  Select the entry Network adapters and click Next.

• In the next screen

  

  first select Microsoft from the list of Manufacturers

  and then select Microsoft Loopback Adapter from the

  list of Network Adapters. Finally, click Next once more.

• Almost finished:

  

  This is your last chance to abort, otherwise, click Next.

• After a while you should see:

  

  Click Finish to exit the Hardware Wizard.

You are now ready to configure your newly installed Loopback adapter. Even though

Windows might not ask you to, reboot anyways (heey, it’s a Microsoft OS ;-)).

From reports I’ve seen on the Internet a reboot is sometimes required for the

loopback adapter to come up properly.

Configuring the Loopback Adapter

Now that your newly installed loopback adapter is up and running we must configure

it properly:

• Go to the Network Connections Center:

  

• Choose the loopback adapter (usually it is named “Local Area Connection #3″)

  and right-click on it.

• Choose Properties, after which a new window will appear

  

  Make sure that

  • the entry Client for Microsoft Networks

    is NOT enabled, i.e. does not have a checkmark in front of it.

  • the entry File and Printer sharing for Microsoft Networks

    is NOT enabled, i.e. does not have a checkmark in front of it.

  • the entry Internet Protocol (TCP/IP) is enabled.
• Select the entry Internet Protocol (TCP/IP), then click on

  Properties.

• A new window will appear:

  

  Select Use the following IP address and fill in the ‘IP address’

  and ‘Subnet mask’ as above.

  It is not necessary to fill in the ‘Default gateway’ or a ‘DNS server’.

• Click on Advanced to make the following window appear:

  

  Deselect Automatic metric and fill in the value of 9999

  as the ‘Interface metric’ as shown above.

• Click on the WINS tab:

  

  and select Disable NetBIOS over TCP/IP.

• Click on OK.
• You are now back in the main ‘TCP/IP Properties’ screen. Click OK again.
• You are now back in the main ‘Loopback Properties’ screen. Click Close.

Tweaking the ‘SMB’ driver

Now we first need to tweak a Windows system driver to overcome the thing that

Microsoft broke. The root cause of the problem is that we need to access the

file share using TCP port 445. However, when Windows Vista or 7 boots

this port is grabbed by the system smb driver for all interfaces.

By delaying the startup of the smb driver and by installing a

portproxy rule we can circumvent this. This section explains how

to do this:

• Start a console window with elevated (Administrator) privileges.
• First, we disable the automatic starting of the smb driver:

    sc config smb start= demand
  

  NOTE the space after the start= !

• Next we add a portproxy rule to reroute TCP port 445 to a port of

  our choosing. For this tutorial, I choose 44445:

    netsh interface portproxy add v4tov4 listenaddress=10.255.255.1 listenport=445
          connectaddress=10.255.255.1 connectport=44445
  

  IMPORTANT NOTES:

  • The listenaddress is the address of the Loopback adapter

    configured in the section earlier

  • The connectaddress must be identical to the listenaddress
  • Using listenaddress=127.0.0.1 does not work. Believe me, I’ve tried.

  If all went well you should see something like

  

  The portproxy rule is persisent , so there should be no need to repeat

  this step after a reboot.

Creating a task to start the ‘SMB’ driver

Of course, now that we have disabled the automatic startup of the ‘SMB’ driver

we need to start it manually when Windows comes up, or rather, when a user

logs in. For this we use the Vista/7 Task Scheduler:

• Start the ‘Task Scheduler’ from the ‘Administrative Tasks’ menu:
• Click on ‘Create Basic Task’ to use the Task Wizard. A new window will

  come up:

  

  Enter the name of the task, e.g. Start SMB driver

  and click Next.

• Choose an event to trigger the execution of the task. We will change this

  later on, so for now, choose When I log in:

  

  and click Next.

• Next we need to choose the type of action:

  

  Select the entry Start a program and click Next.

• Fill in the details of the program we want to start:

  

  • The Program is ‘c:windowssystem32net.exe‘
  • The Arguments are ‘start smb‘

  Then click Next to continue.

• Before clicking ‘Finish’ first select the tickbox ‘Open the properties dialog’:

  

  and then click Finish.

• In the ‘Task Properties’ window select Run whether user is logged on or not, then

  select Do not store password. After that, also select the tickbox

  Run with highest privileges:

  

  Do NOT click ‘OK’ just yet, but go to the ‘Triggers’ tab, then double-click

  the ‘At log on’ trigger to edit it.

• In the ‘Edit Trigger’ window change the setting ‘Specific user or group’ to

  Any user:

  

  then go to the ‘Conditions’ tab:

• In the ‘Conditions’ window make sure the setting ‘Start the task only if the computer

  is on AC power‘ is NOT set:

  

  and then click OK.

The task is now configured. Close the Task Scheduler.

Reboot and verify

Of course, now that we have disabled the automatic startup of the ‘SMB’ driver we have to

reboot Windows before proceeding.

• After Windows comes up and you have logged in, check the status of the ‘SMB’ driver. Open

  a command console (no privilege elevation is required) and type

    sc query smb
  

  The SMB driver should be in the state Running.

• Verify that the portproxy was applied successfully by checking the open ports

  on the system. Type in the command console

    netstat -an | find ":445 "
  

  You should see something like

    TCP    10.255.255.1:445    0.0.0.0:0       LISTENING
  

  If you see ‘0.0.0.0:445‘ instead then the ‘portproxy’ rule was not applied

  correctly.

Configuring PuTTY

Set up a special PuTTY session with the appropriate port-forwarding:

• Start PuTTY and create a new session or load your existing session for

  logging in on login.nikhef.nl. Choose host login2.nikhef.nl

  and protocol SSH.

• Expand the Connection->SSH menu option in the Category tree-list

  and select Tunnels.

• Add a new forwarded port:

  

  • For the Source port, fill in the IP address of your

    loopback adapter, plus the port 44445 (NOT 445!).

    The entry field might seem

    to small for it, but it will work. If you have configured your

    loopback adapter exactly as in the previous section, then fill in

    10.255.255.1:44445.
  • For the Destination, fill in beuk.nikhef.nl:445.
  • Click on Add.
• You should now see:

  

• In the Category tree-list on the left, scroll back up and choose

  Session again. Save your session.

Putting it all together

Now that we have configured both our loopback adapter and PuTTY we can put it

all together and mount our Nikhef home directory as a Windows share:

• Start your newly created Nikhef-PuTTY session and login on

  login2.nikhef.nl as normal.

• Make sure port-forwarding is working properly by checking the PuTTY

  event log. Select the Window menu of the PuTTY screen (top left) and

  select Event log. You should see a log similar to:

  

  If not, then check your PuTTY session options first.

• Go to Start->Run and type \10.255.255.1user<Your-nikhef-userid>
• You will be prompted to authenticate yourself:

  

  For the Username, fill in the domain NIKHEF followed

  by your Nikhef-Windows userid.

  For the Password, fill in your Nikhef-Windows password, which

  might be different from the password you use to log in on

  login2.nikhef.nl and press OK.

• You should now see your Nikhef home directory in Windows Explorer!

Congratulations!

Mapping a network drive

To make life even easier it might be handy to map a network drive to your

Nikhef home directory:

• Start Windows Explorer and choose Tools->Map Network Drive.
• In the next screen, fill in:

  

  • Choose an available drive letter.
  • Do NOT click on Browse but type in as the Folder

    name:

    \10.255.255.1user<Your-nikhef-userid>

  • Do NOT click on Finish, click on

    Different user name.

• In the next screen, fill in your Nikhef-Windows userid:

  

  For the User name, fill in the domain NIKHEF followed

  by your Nikhef-Windows userid.

  For the Password, fill in your Nikhef-Windows password, which

  might be different from the password you use to log in on

  login.nikhef.nl and press OK.

• Click on Finish to complete the network drive mapping.
• You should now see a new drive letter appear in the Folders tree-list

  in Windows Explorer. Click on it to verify that you are indeed viewing your

  Nikhef home directory.

Control+Z! Undo! Undo!

For those wishing to undo the CIFS-over-SSH trick follow these steps:

1. Start a console window with elevated (Administrator) privileges.
2. Restore the automatic startup of the smb driver by typing

     sc config smb start= auto
   

   NOTE the space after the start= !

3. Remove the portproxy rule by typing

     netsh interface portproxy delete v4tov4 listenaddress=10.255.255.1 listenport=445
   

4. Start a Device Manager by typing

     devmgmt.msc
   

   Expand the ‘Network Adapters’, right-click on Loopback adapter and select

   Uninstall.

5. Use the ‘Task Scheduler’ from the ‘Administrative Tasks’ menu to delete the

   task ‘Start SMB driver’

That’s all, folks!