Sponsored Content
Top Forums Shell Programming and Scripting Are free public shells for ssh tunneling safe? Post 302468105 by Neo on Monday 1st of November 2010 04:15:47 PM
Old 11-01-2010
Quote:
Originally Posted by rafunk
To clarify, by public shell I meant a shell for which you can sign up on certain websites for free. You signup and then you can use your personal login and password to access the shell.
I understood exactly what you mean by a free shell account.

On these accounts, you don't have superuser permissions and you did not install and compile sshd yourself. This means you don't know what sshd is doing.

In addition, when you set up an ssh connection between your client and the free shell server, only the connection is secure between the end points of the sockets.

This means that the superuser on the free server could, in theory, log and read your messages, if they wanted to with a simple code mod.

If you want "security" you need to have control over the "box in the middle" or you will be subject to a variation of what is called "the man in the middle attack".

Of course "secure" is relative, and if you don't care if the superuser on the free shell server can track your web surfing, then ...... it does not matter. I simply answered your question correctly, that it is not "secure" to use a third party server that you don't have superuser privs on the box.
This User Gave Thanks to Neo For This Post:
 

10 More Discussions You Might Find Interesting

1. Solaris

ssh tunneling

Hi, I have tried the following: on PC1 (win xp) I have created ssh connection with port forwarding (local 8888 to remote 8888) to server1. >From server1 I have created another ssh connection with port forwarding to server2(local 8888 to remote 1521). When I try to connect to oracle... (3 Replies)
Discussion started by: goran00
3 Replies

2. UNIX for Advanced & Expert Users

SSH Tunneling

Hi all question - there are 2 servers A + B. server A is connected to the internet and running a squid proxy server - server B is behind a firewall. I can ssh from A to B but not from B to A. I need internet access on B to update some files. I thought I could use some sort of ssh tunnel to... (1 Reply)
Discussion started by: silvaman
1 Replies

3. Filesystems, Disks and Memory

Tunneling NFS through SSH????

Hello Folks, Im trying to pass the NFS Shared data through the SSH tunnel. Following are the Steps for my Executions: A) Commands Executed on Server (NFS Server + SSHD Server running) i) share -F nfs -o rw=<NFS Server IP> /home ii) Start the NFS Server Services and SSHD Services. ... (3 Replies)
Discussion started by: ImpeccableCode
3 Replies

4. UNIX for Advanced & Expert Users

tunneling commands and file transfers through established ssh connection

Hi - I frequently run commands, and transfer files to/from a host that uses SecurID ssh authentication. It is a real pain to have to enter the authentication information every time I want to interact with this host. I am wondering if there is a way to establish a one-time ssh connection to this... (2 Replies)
Discussion started by: cpp6f
2 Replies

5. Infrastructure Monitoring

Tunneling UDP via SSH

Performing UDP tunneling through an SSH connection Found this while looking for a way to temporarily forward SNMP requests across otherwise disconnected networks. Might be useful for someone else, too. (1 Reply)
Discussion started by: pludi
1 Replies

6. Shell Programming and Scripting

What are public keys in ssh and how do we create the public keys??

Hi All, I am having knowledge on some basics of ssh and wanted to know what are the public keys and how can we create and implement it in connecting server. Please provide the information for the above, it would be helpful for me. Thanks, Ravindra (1 Reply)
Discussion started by: ravi3cha
1 Replies

7. UNIX for Dummies Questions & Answers

SSH port forwarding/tunneling

So this seems like something that should be simple...but I can't quite seem to get it up and running. I have a machine, .107 with a GUI on port 8443. The problem is that I can't connect directly to .107 from my laptop. Now I have another machine, .69 that can connect to .107. So shouldn't I be able... (4 Replies)
Discussion started by: DeCoTwc
4 Replies

8. UNIX for Advanced & Expert Users

Server access for SSH Tunneling!

Hi! I came to know about SSH Tunneling to bypass the Firewall. I will have to setup a free access SSH server to tunnel data access through PUTTY or OpenSSH. The problem is that I don't know about any free access servers. So, can anyone of you guide me for that, for any type of help? (1 Reply)
Discussion started by: nixhead
1 Replies

9. UNIX for Dummies Questions & Answers

Ssh tunneling

I want to perform ssh tunnelling for which I have been using PuTTy. Config is as follows: Host IP: 172.XX.XX.111Port: 22Tunnel setting source port: 19005Destination: 172.XX.XX.40:1521After entering my user ID and password, I am able to see in my command prompt that 127.0.0.1:19005 is listening.... (1 Reply)
Discussion started by: aakashsoor
1 Replies

10. Shell Programming and Scripting

Query regarding PuTTY SSH Tunneling

I have a process running on my local server. http://dev.techx.com:6060/proct I wish to block port 6060 and expose port 7777 to the outside world. I block port 6060 and open port 7777 on the firewall. What should be the PuTTY Settings -> Connection -> SSH -> Tunnels 1. Destination ... (3 Replies)
Discussion started by: mohtashims
3 Replies
SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
All times are GMT -4. The time now is 05:36 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy