03-30-2009
Running script through SSH as root
Hi all,
I have a situation where I have a shell script that I need to run remotely on multiple *nix machines via SSH. Unfortunately, some of the commands in it require root access. I know that best practices for ssh entail configuring it so that the root account cannot log in, you need to elevate to root via su after logging in with a regular account.
Unfortunately, this seems to leave me in a dilemma: How in a script can I elevate to root, since it will prompt me for a password that I will not be there to enter? Or, is there some other alternative from an advanced security perspective that will allow me to log in with an account that has root level access to the machine (but isn't the actual "root" account)?
Finally, just to head this off: No, I cannot set the script up in crontab to run as root at a certain time/frequency. The requirements for this script to run is: 1) SCP it to /var/tmp; 2) Execute via SSH as root or root-equivalent; 3) scrape the output; 4) Execute "rm /var/tmp/script.sh" via SSH to remove it.
Any suggestions?
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LEARN ABOUT SUSE
ssh-keysign
SSH-KEYSIGN(8) BSD System Manager's Manual SSH-KEYSIGN(8)
NAME
ssh-keysign -- ssh helper program for host-based authentication
SYNOPSIS
ssh-keysign
DESCRIPTION
ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
SSH protocol version 2.
ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
EnableSSHKeysign to ``yes''.
ssh-keysign is not intended to be invoked by the user, but from ssh(1). See ssh(1) and sshd(8) for more information about host-based authen-
tication.
FILES
/etc/ssh/ssh_config
Controls whether ssh-keysign is enabled.
/etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, read-
able only by root, and not accessible to others. Since they are readable only by root, ssh-keysign must be set-uid root if host-
based authentication is used.
SEE ALSO
ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
HISTORY
ssh-keysign first appeared in OpenBSD 3.2.
AUTHORS
Markus Friedl <markus@openbsd.org>
BSD
May 31, 2007 BSD