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Re: Troubleshooting SSH connection as SYSTEM user.


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

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