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Execute Program Via Ssh

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Active2 months ago

Is there a way to structure a single command to login via SSH to a remote server and run a program on the remote login shell?

4 thoughts on ' Execute Shell Commands Over SSH Using Python and Paramiko ' maryam October 19, 2016. Thank you for your post, it's useful. I would like to know how it would change the program if I want to send result after ssh to my local, I have added these two lines after finally part.

In the OpenSSH manual, it reads 'If command is specified, it is executed on the remote host instead of a login shell.' So, for example, ssh user@server mail will login to the remote server, display the mailbox status, and then return you to the local shell. Is there a way to stay on the remote shell after displaying the mail status?

Furthermore, ssh user@server [command] does not seem to work if the command is a program, for example vim or mutt. Is there a way to login to the remote shell and run a program while staying in the remote shell during the program and after exiting the program, only finally exiting upon a specific logout command (just like in a normal SSH session)?

I would eventually like to be able to put such a command as an alias in the local .bashrc, so that it could be run quickly when desired. An example would be to login via SSH to a remote server and open mutt on the remote server to read or send email.

user981178user981178

1 Answer

Have you tried ssh -t user@server 'mail && bash' (or replace bash with whatever shell you like)?

The -t is necessary in order to create a pseudo-tty for bash to use as an interactive shell.

Jeff Schaller
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Execute Program Via Ssh Windows 10

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Active8 years, 2 months ago

I have a small SSH server, and I'd like to write a script to run each time somebody logs in via SSH.

Now, how would I go about that?

I'd like the script to run everytime ANYBODY logs in, and I need to have access to at least the username of the person who logged in, and the IP address the person logged in from. Cyberlink labelprint 2.5 crack keygen.

I thought about using /etc/bash.bashrc, but is that a good solution? For instance, is there a way a user could disable its use, and thus disable my script? If yes, what are my other options?

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Thanks.

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4 Answers

Execute Program Via Ssh Download

The mechanism to use depends upon your goals.

If you wish to provide something convenient or friendly for your users, then your /etc/profile is reasonable enough if all your users use the same shell. If you want the commands to execute only when logging in via ssh, place commands into /etc/ssh/sshrc. (If you don't mind users overriding the commands with their own ~/.ssh/rc file.)

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If you want to force a user to execute one program, and only one program, then the ForceCommand option as described by DigitalRoss is a good approach. (I personally would further confine the user with a mandatory access control system such as AppArmor, SELinux, TOMOYO, or SMACK, to ensure the program can not allow a user to escape. I've worked on AppArmor for ten years, so that's the tool I'd pick first, but the others are fine tools written by excellent programmers.)

If you just want one program to execute and not bother the user in any way, then the best approach is to use the pam_exec(8) module, which cannot be bypassed, works regardless of shell, and provides easy ability to run as the user or as the user account of the program performing the authorization. The manpage gives the following example:

This could be extended to run on auth, account, password, and session actions; probably session would be best for executing upon log in. Just add a line like:

to your /etc/pam.d/sshd control file.

sarnoldsarnold
Ssh execute script remotely

Newish versions of OpenSSH have a server feature called ForceCommand that gives control to a script instead of the operation (scp, ssh, ..) that the user intended. The script is passed the original command, so you could probably chain to it after doing whatever you need to do.

From sshd_config(5):

ForceCommand

Forces the execution of the command specified by ForceCommand, ignoring any command supplied by the client and ~/.ssh/rc if present. The command is invoked by using the user's login shell with the -c option. This applies to shell, command, or subsystem execution. It is most useful inside a Match block. The command originally supplied by the client is available in the SSH_ORIGINAL_COMMAND environment vari- able. Specifying a command of ``internal-sftp' will force the use of an in-process sftp server that requires no support files when used with ChrootDirectory.

I used this once to override scp and provide secure gem upload without giving every user authorized to upload gems interactive access they didn't need or want.

DigitalRoss
Ssh

Newish versions of OpenSSH have a server feature called ForceCommand that gives control to a script instead of the operation (scp, ssh, ..) that the user intended. The script is passed the original command, so you could probably chain to it after doing whatever you need to do.

From sshd_config(5):

ForceCommand

Forces the execution of the command specified by ForceCommand, ignoring any command supplied by the client and ~/.ssh/rc if present. The command is invoked by using the user's login shell with the -c option. This applies to shell, command, or subsystem execution. It is most useful inside a Match block. The command originally supplied by the client is available in the SSH_ORIGINAL_COMMAND environment vari- able. Specifying a command of ``internal-sftp' will force the use of an in-process sftp server that requires no support files when used with ChrootDirectory.

I used this once to override scp and provide secure gem upload without giving every user authorized to upload gems interactive access they didn't need or want.

DigitalRossDigitalRoss
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One way would be to use syslog-ng as a syslog daemon and configure it to run a script background every time a certain log entry (such as a successful ssh login) matches.

Execute Program Via Ssh Server

Janne PikkarainenJanne Pikkarainen
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Ssh Execute Command And Exit

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Execute Program Through Ssh

I don't believe there is a way to disable this from running. Can anyone else verify this?

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