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Full Discussion: ssh foo.com sudo command - Prompts for sudo password as visible text. Help?
Top Forums Shell Programming and Scripting ssh foo.com sudo command - Prompts for sudo password as visible text. Help? Post 302567842 by fluoborate on Tuesday 25th of October 2011 08:07:52 AM
Old 10-25-2011
ssh foo.com sudo command - Prompts for sudo password as visible text. Help?
I am writing a BASH script to update a webserver and then restart Apache. It looks basically like this:

Code:
#!/bin/bash
rsync /path/on/local/machine/ foo.com:path/on/remote/machine/
ssh foo.com sudo /etc/init.d/apache2 reload

rsync and ssh don't prompt for a password, because I have DSA encryption keys. However, if rsync or ssh did prompt for a password, it would be invisible as I typed it in.

Sadly, sudo does prompt for a password. Not only that, the password gets displayed on the screen of my local machine as I type it.

Edited to add this paragraph:
Here is an example of what happens:
Code:
local-box$ ./myScript.sh
[sudo] password for fluoborate:

It wants the password for "sudo /etc/init.d/apache2 reload", and it wants the password for the user fluoborate on remote-box. When I type in the password, it appears, it is visible on my screen (the screen of local-box).

Possible solutions:

1. Ideally, I would like to be able to do something like this:
Code:
sudo --password=thisIsThePassword /etc/init.d/apache2 reload

Before you balk at how insecure that is: I would prompt for the password earlier in the script, rather than hard-coding it, so reading the source code will not include the password. Also, nobody else can login to the remote machine, so they cannot see the command line arguments or look at my BASH history.

2. Modify my sudoers file. I don't want to do this, and I haven't been able to figure out how. I am on Ubuntu (10.10 server, iirc). I can make it never prompt for a sudo password, but I cannot make it always prompt except for the one command "sudo /etc/init.d/apache2 reload". If you can provide very explicit instructions to get that working, then please do, I will be forever grateful.

3. Use expect. I simply don't want to do this, it is ugly.

Thank you for the help.
Last edited by fluoborate; 10-25-2011 at 09:49 AM..
 

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LEARN ABOUT DEBIAN

mtail

MTAIL(1)							   User Commands							  MTAIL(1)

NAME

       mtail - tail variant designed for web developers monitoring logfiles

SYNOPSIS

       mtail [options]	<file>...

DESCRIPTION

       MonkeyTail  allows  a  user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the
       output whenever a pause in output over 3 seconds is detected.

       MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo.

OPTIONS

       -q     Quiet mode

       --quiet
	      "    "

       -n     Output the last N lines of each file before tailing (defaults to 0)

       <file>...
	      Files to tail.

	      These can specified in the following ways:

       @<groupname>
	      - expands the group (from .mtailrc) to a list of

	      files to tail

       <filename>
	      - tails a local file.

       +<filename>		- attempts to sudo and tail a local file (will
	      prompt for pwd if required).

       <remotehost>:<filename>
	      - attempts to invoke tail via ssh on a remote

	      host.

       +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a
	      remote host (will prompt for pwd if required).

SEE ALSO

       mtailrc(5), tail(1)

AUTHOR

       Martyn Smith <martyn@dollyfish.net.nz>

mtail								     May 2008								  MTAIL(1)
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