Troubleshooting SSH connection as SYSTEM user.

Larry Hall (Cygwin) reply-to-list-only-lh@cygwin.com
Thu May 26 22:19:00 GMT 2011


On 5/26/2011 5:46 PM, Matthew Leonhardt wrote:
> On Thu, May 26, 2011 at 4:47 PM, Larry Hall (Cygwin) wrote:
>> On 5/26/2011 11:10 AM, Matthew Leonhardt wrote:
>>>
>>> Hello all,
>>>
>>> I'm trying to install a service to keep some SSH tunnels alive using
>>> the following script:
>>>
>>> $ cat ssh_tunnel.exe
>>> #!/usr/bin/bash
>>> while :
>>> do
>>>    /cygdrive/c/WINDOWS/system32/netstat -an | grep 192\.168\.0\.1:139 \
>>>      | grep LISTENING>    /dev/null
>>>    if (( $? )); then
>>>      /usr/bin/ssh -v -v -v -x -i/home/user/.ssh/id_rsa -2 \
>>>        -L 192.168.0.1:139:127.0.0.1:139 -N remote_user@remote.host 2>&1&
>>>    fi
>>>    /cygdrive/c/WINDOWS/system32/netstat -an | grep 192\.168\.0\.1:3306 \
>>>      | grep LISTENING>    /dev/null
>>>    if (( $? )); then
>>>      /usr/bin/ssh -v -v -v -x -i/home/user/.ssh/id_rsa -2 \
>>>        -L 192.168.0.1:3306:127.0.0.1:3306 -N remote_user@remote.host 2>&1&
>>>    fi
>>>    sleep 300
>>> done
>>>
>>> The script works fine at the command line, but fails when running as a
>>> service.  My vain attempt to gather info (-v -v -v) only yields:
>>>
>>> Permission denied, please try again.
>>> Permission denied, please try again.
>>> Permission denied (publickey,gssapi-with-mic,password).
>>>
>>> in the service log (all three lines for each instance of an ssh command).
>>>
>>> SYSTEM should have access to id_rsa:
>>>
>>> $ getfacl id_rsa
>>> # file: id_rsa
>>> # owner: user
>>> # group: Domain Users
>>> user::rw-
>>> group::---
>>> group:SYSTEM:r--
>>> mask:rwx
>>> other:---
>>>
>>> $ ls -l id_rsa
>>> -rw-------+ 1 user Domain Users 1679 Dec 13 13:40 id_rsa
>>>
>>> But, id_rsa was generated as "user", not as "SYSTEM," so I'm wondering
>>> if SYSTEM needs it's own private RSA key, and how one would go about
>>> generating one, since I don't seem to be able to su to the SYSTEM
>>> user.
>>
>> Correct.  What you propose could be a work-around for your case.  Check
>> out the link below for how to create a SYSTEM-owned shell that you can
>> then experiment with.
>>
>> <http://cygwin.com/ml/cygwin/2004-08/msg01132.html>
>
> Brilliant!  That's exactly what I was looking for and it totally did
> the trick.  TY!

You're welcome.

> FWIW, I had to modify the shortcut to use full paths to the date and
> sleep commands.

Smart move. :-)

-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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