Question

Oracle ssh remote tunnel - Acess database objects via TOAD (or any other oracle app)

Asked by: barnarp

Hi all,

I want to connect TOAD to Oracle through a firewall (on Unix server behind firewall) using SSH.

I have Oracle 9i client on local windows XP pc.
I am using SSH Tectia client (latest commercial version).

I created a remote tunnel of type TCP with local and destination port to 1521.

I can connect ssh on port 22 through Tectia client to the Unix box, but in the log it fails to create the tunnel.

Do I need a oracle server on my local pc to make this work?

Which port should I run locally, as I think 1521 local might be wrong.

Any help please?

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Asked On
2009-09-18 at 05:46:19ID24743019
Tags

oracle

,

ssh

,

tunnel

,

secure

Topics

SSH / Telnet Software

,

Oracle 9.x

,

Oracle 3rd Party Tools

,

Oracle Database

,

Remote Desktop/Terminal Services

Participating Experts
2
Points
250
Comments
11

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Answers

 

by: barnarpPosted on 2009-09-18 at 06:46:54ID: 25365866

250 worth.

 

by: arober11Posted on 2009-09-19 at 07:41:03ID: 25373187

On the remote server, type:

grep -i AllowTcpForwarding /etc/ssh/sshd_config

If you don't see:

AllowTcpForwarding yes

Then tweak the value and restart the sshd servie.

 

by: arober11Posted on 2009-09-19 at 17:35:46ID: 25375432

Once you have the tunnel sorted out, if you haven't already done it you'll need to alter the tnsname.ora entry for the remote database, to have 127.0.0.1 as the IP. Toad has an inbuilt TNSNAMES.ora editor

 

by: dvzPosted on 2009-09-20 at 14:58:53ID: 25379184

Likely, I am misunderstanding.  Connecting with SQL*Net from a TOAD client into a target database goes through the Oracle listener process (which passes the connect request to the appropriate instance).  The Oracle username/password authentication is internal to the database, and has nothing to do with the host authentication nor a host user session.  

I am willing to learn something entirely new, barnap, but my advice is you cannot do what you say you want to do.  Secure Shell authentication is only for client to server.

 

by: barnarpPosted on 2009-09-21 at 00:04:46ID: 25380706

arober11, I dont have access to admin the unix box.

dvz, according to toadsoft this is possible: from the toad help file:


Using Toad with a Firewall
You can connect Toad to Oracle through a firewall using the SSH© Secure Shell" software, version 2.4.0. Other software may work, but has not been tested with Toad. In order for Toad to remain connected, both the SSH tunnel and client must be running.

To connect through a firewall

From the main SSH Secure Shell screen, select the profile/edit profile menu button.



From the tabs on the right panel of the Profiles window, select Outgoing Tunneling.

Click Edit. Enter tunnel information in the Edit Outgoing Tunnel dialog box.



Edit your Tnsnames.ora file as follows

NOTE: Make sure to correct the port to the one you used when setting up your tunnel.

add (server=dedicated)

CADEV.world =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 11521))

)

(CONNECT_DATA =

(SID = cadev)

(server=dedicated)

)

)

Start an SSH client and connect to Toad.

 

by: barnarpPosted on 2009-09-21 at 00:16:32ID: 25380752

arober, I ran the command on the box and get:
AllowTcpForwarding no

I dont know if the admins would allow to enable tcp forwarding. Is it not a security risk?

 

by: arober11Posted on 2009-09-21 at 01:28:15ID: 25381063

Yes

 

by: dvzPosted on 2009-09-21 at 06:50:16ID: 25382793

tks barnarp, every day's an adventure...

 

by: barnarpPosted on 2009-09-21 at 07:03:59ID: 25382912

yeah dvz, you said it. Turns out unix admins wont switch on tcp forwarding. go figure.

 

by: arober11Posted on 2009-09-21 at 13:25:23ID: 25387227

If you have a plain old ssh terminal session, and permissions permitting, you could start a sqlplus session on the remote DB

Note: Remember to set the ORACLE_HOME environment variable, if not already set.

20120131-EE-VQP-002

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