SSH (Secure SHell) is a protocol for running commands on a remote computer.

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Disable SSH password authentication on specific interface

I have an OpenWrt router, I want to disable password authentication on SSH, so that one can only authenticate with keys. This is easily achieved by following the guide in the documentation, however, I ...
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1answer
407 views

Can I switch to another process in another tty# terminal from an ssh terminal?

Here's the deal. I have a Linux Mint 15 server running a web server, an ssh server, and a minecraft server. When I go back to college after the summer, I want to leave my machine at home (6 hrs away) ...
1
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1answer
325 views

X11 forwarding over ssh

I used to log into a remote server on our corporate network using Xephyr and ssh using the following command Xephyr :0 -ac -br -screen 950x540 | xterm -bg black -fg white -display :0 -e ssh -Yf ...
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0answers
914 views

Can I ssh to a server through a pptp tunnel? [closed]

I'm new to VPNs, so there's a good chance I'm completely misunderstanding my needs here. My workplace is setup so that I can only ssh into its servers when either (a) I'm using a computer in the ...
4
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1answer
5k views

Adding public is_rsa.pub to known_hosts automatically - how to?

How to automatically add server to known_hosts ? (and not use md5 fingerprint, as I mean secure way, please not send "auto yes/accept" solutions. I want to bring required credentials from server to ...
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1answer
1k views

git, setting up remote repository without ssh

I want to set up a remote git repository on a openSuse machine, and I have the following question. Do I really need ssh on the machine, to set up the remote git repository? Initially is it possible ...
0
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1answer
285 views

Can I use `screen` to keep an ssh tunnel alive from the client?

I read here that you can keep your ssh sessions alive a bit longer using a utility called GNU screen. Is it possible to keep an SSH tunnel alive longer with this as well?
2
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4answers
479 views

Allow guest SSH login and redirect to a program

Sometimes I get really silly ideas. This time, the idea is to deliver an easter egg for anyone who decides to try and connect to my server via SSH. Doing so will run a program, such as easteregg.sh, ...
5
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1answer
2k views

Generate own (stronger) RSA host key for OpenSSH?

I would like to replace the default 2048 bit host key generated when installing OpenSSH or starting it the first time with one of 4096 bit length. This leads to two questions: Does OpenSSH allow ...
3
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1answer
102 views

What is the best way to create remote tunnel?

I have 3 Linux servers: 10.0.0.0/24 - (10.0.0.10) Linux server inside my LAN. 20.0.0.0/24 - (20.0.0.10) Linux server with HTTP Apache server 50.50.50.50/32 - Server on Amazon AWS which see ...
2
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1answer
258 views

Lazy mount of remote filesystem (with sshfs)

I have a remote computer, and I mount its filesystem with sshfs to my local folder ~/user@host, like that: sshfs user@host: ~/user@host Works nice, but I want to implement "lazy" mount: i.e. I ...
4
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1answer
14k views

channel 1: open failed: administratively prohibited: open failed [duplicate]

I am trying to set up an SSH tunnel (on a Raspberry Pi) with the following command: ssh user@terbank.cs.kuleuven.be -L 5672:tabor.cs.kotnet.leuven.be:5672 -N (I should note that I can, or at least ...
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2answers
3k views

Automating backups run from a bash script in Linux the right way

I have a bash script I wrote to backup a Moodle installation. It works fine, I've tested the backups, but there's a problem with it; when I do the backups, since I have to use sudo to type the ...
2
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1answer
364 views

View blocked address from sshguard

How can I view all the addresses that sshguard has blocked to iptables?
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2answers
362 views

How to fix 'set -o emacs' in .bashrc not working in ssh shell

I work in an LDAP-based user and host network. My user exists on all hosts since it an LDAP user, and my user's home directory exists on all hosts as a mountpoint. I have ~/.bash_profile set up to ...
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1answer
152 views

How to fix SSH on OSX?

I have been able to connect to OSX machine using ssh client successfully for hours, but then it stops working and I get connection refused. ps -ax | grep ssh 841 ttys004 0:00.00 grep ssh Using ...
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3answers
173 views

How can I automatically log in to a list of servers to prevent account lockout?

I have started a new contract, and need to have an active account on almost 200 servers. Security has accounts lock after 30 days of inactivity, as well as if you do not log in within 1 hour of ...
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2answers
19k views

Terminate dropped SSH sessions

My SSH sessions seem to be dropping though that is not my major problem - the major problem is my previous sessions are still alive, worse yet one of them is running visudo preventing me from ...
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1answer
958 views

su to another user using ssh keys?

Assuming that user_A and user_B set up and exchange public ssh keys with each other, is it possible for user_A to su into user_B on the same machine?
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3answers
29k views

Logging SSH access attempts

I've configured an ubuntu server with openssh in order to connect to it and execute commands from a remote system like a phone or a laptop. The problem is... I'm probably not the only one. Is there ...
1
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1answer
301 views

Connecting to Github from server

I am trying to connect to Github from a server running Jenkins. To do this, I'm copying my public key from another server, into the authorized_keys on the new server. All I'm getting is the ...
28
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4answers
40k views

Specify identity file (id_rsa) with rsync

I need to make periodic backups of a directory on a remote server which is a virtual machine hosted by a research organisation. They mandate that access to VMs is through ssh keys, which is all good, ...
2
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1answer
233 views

SSH tunnelling outgoing traffic shaping

I am using an OpenSSH server for a client app that uses the traffic forwarding, SSH tunnelling and some users are consuming an extraordinary amount of bandwidth. Is there a way to shape the traffic on ...
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3answers
12k views

Number of SSH connection(s) on a single linux machine

I landed up in a situation wherein I had to access a Linux machine via puTTY.I made various attempts to SSH but failed to connect to the machine. I then realised my colleague was accessing the same ...
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3answers
10k views

Get ssh server key fingerprint

Is there a way to programmatically obtain a SSH server key fingerprint without authenticating to it? I'm trying ssh -v user@host false 2>&1 | grep "Server host key", but this hangs waiting for ...
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2answers
421 views

Allow a user to run a single command as root over ssh

I have a user account that is not designed for logging in interactively, but want to allow it to run a single command (as root). Is there a better way to accomplish this (without granting more rights ...
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3answers
6k views

Why does SSH show protocol as tcp6 *and* tcp in netstat?

$ netstat -nat Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:80 ...
2
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1answer
490 views

SSH Setup - How will the router know my computer's ip?

I'm very new to the networking side of the house and am trying to set up SSH on my new Ubuntu machine. I have my DD-WRT router working with DDNS now and can log in to the router page -- but I'm not ...
6
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1answer
143 views

Tracking my shell path in Emacs

Not a long time ago, I found the following precious snippet that allows Emacs to track my current directory on any ansi-term buffer. More specifically, if I cd <some/path> from within a ...
2
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1answer
1k views

SSH Login Alert Using pam_exec

Hi I have been trying to follow the information about pam_exec from here: Ssh login hook? When a user log's in they get: /etc/pam.d/email-alert.sh failed: exit code 8 My sshd file has this at the ...
4
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2answers
2k views

Unable to get the right exit code from a script

I have a script which connects to a remote server via SFTP and get some file from there. My script goes like this: /usr/bin/sftp USER@remote.server.com <<EOF lcd /dir1/dir2/dir3 cd ...
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1answer
144 views

osx server, windows client, running emacs opens it on server not client

I've installed emacsformacosx on my OSX box. I'd like to shove my macmini in a data center and run it headless. I've gotten x-windows working. If I run xeyes, it displays on my Windows 7 client. ...
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1answer
25k views

Use different username by default for a specific host

I have a different (assigned, non-changable) username on one of the servers I log to regularly, and I would like to avoid writing it down every time. Can I make these lines [tohecz@localhost ~]$ ssh ...
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1answer
9k views

Login via ssh without password, getting authorized_keys file removed after first login attempt

I'm trying to configure passwordless login via ssh. I have Centos 6.5 This what I did: copied content of id_rsa.pub from my client machine to ~/.ssh/authorized_keys set permissions 700 to ~/.ssh and ...
6
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1answer
133 views

Send only one warning when the private key is not available

For added security, I would like to require a private key to use sudo on my Ubuntu Server box. I've added private key authentication for sudo as described at ...
1
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1answer
2k views

scp to Local Machine After SSHing [duplicate]

From my local machine I can copy files from a remote machine scp remote:/some/file/path ~ But what if I'm already SSHed into the remote machine? Can I do something like this ssh remote cd ...
0
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1answer
288 views

Unrar local files to remote server [duplicate]

I have two Linux servers, one which has several RAR files and another empty one. I would like to extract the archives and move the content to Server 2. The problem is: I do not have enough storage to ...
3
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1answer
179 views

Unrar local files to remote server

I have two Linux servers, one which has several RAR files and another empty one. I would like to extract the archives and move the content to Server 2. The problem is: I do not have enough storage to ...
2
votes
1answer
2k views

Shellscript! Syntax error: unexpected “(”

Update: After the changes from the first answer I got some more error codes. : not found: line 23: { esxidown.sh: line 24: redir error Insufficient arguments. : not found: line 26: esxidown.sh: ...
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1answer
741 views

autossh won't run in background

I try to set autossh to run at boot adding it to /etc/rc.local but I am unable to even get it to run in the background. This is the crucial part of my config file: Host remotehost.com LocalForward ...
2
votes
2answers
187 views

using ssh-agent

I have my desktop in the office. When X starts, ssh-agent starts automatically. I have to add my SSH key once, at the beginning, and then I can use ssh without having to enter my password each time. ...
2
votes
2answers
1k views

How is using a public-key for logging in to SSH any better than using a password?

I'm not asking about password vs key authentication. I've seen a few times (and even Amazons AWS) says that even if SSH has a major vulnerability that key authentication would make such an exploit ...
6
votes
3answers
3k views

How to prevent “Last Login:” message from showing up when using sftp?

In Ubuntu GNU/Linux 12.04, I have a user johndoe that is part of an sftponly group, set up to sftp to a chroot jail using Subsystem sftp internal-sftp Match Group sftponly ChrootDirectory %h ...
6
votes
2answers
3k views

Force ssh to always use SSH_ASKPASS

I want to force ssh to always use the program specified by SSH_ASKPASS. In my case the program is just a bash script returning the passphrase. The problem is, as the ssh documentation says: If ...
2
votes
2answers
604 views

SSH: “Connection closed by remote host” randomly while working on an interactive session

I am working on a remote server, on which I do numerical simulation using the OpenFOAM computational fluid dynamics library. I built a collection of Python scripts to automate my parametric studies ...
2
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1answer
168 views

Problem on running Script on host after connecting

I am new to linux scripting. Please help. I searched on below a lot but was not able to find appropriate answer : I am trying to make a script which I will later schedule as cronjob, so that it keeps ...
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3answers
280 views

Why does SSH have unsecure defaults?

Why does SSH come with such an unsecure default configuration? to name what I consider unsecure defaults: root login enabled on SSH SSH protocol version 1 (which is vulnerable to MIM attacks) ...
2
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1answer
656 views

rkhunter /usr/bin/ssh && /usr/sbin/sshd [Warning]

My last rkhuter scan reported a couple of warnings that deserve to be checked(for my noob eyes). Main reason for my suspect is that i wasn't on the machine at (03-Apr-2014 01:12:12) ->AM I googled ...
3
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1answer
130 views

Port forwarding with ssh where the final destination does not have sshd running

I know how to use ssh to port forward a local port say like 7000 to a remote ssh server on port 50070. For example: ssh -L 7000:127.0.01:50070 root@sshserver "Me port 7000" - > "ssherver port ...
3
votes
2answers
79 views

Is there a one liner which can list public key fingerprints with authorized_keys as input?

I'd like to audit the authorized_keys file on a number of servers and match them with known AWS key fingerprints. Is there a one-liner which incorporates ssh-keygen -lf which will output the ...