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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 MOJAVE

softwareupdate

softwareupdate(8)					    BSD System Manager's Manual 					 softwareupdate(8)

NAME

     softwareupdate -- system software update tool

SYNOPSIS

     softwareupdate command [args ...]

DESCRIPTION

     Software Update checks for new and updated versions of your software based on information about your computer and current software.

     Invoke softwareupdate by specifying a command followed by zero or more args.

     softwareupdate requires admin authentication for all commands except --list.  If you run softwareupdate as a normal admin user, you will be
     prompted for a password where required. Alternatively, you can run softwareupdate as root and avoid all further authentication prompts.

     The following commands are available:

     -l | --list
		 List all available updates.

     -i | --install
		 Each update specified by args is downloaded and installed.  args can be one of the following:

		 -r | --recommended
			     All updates that are recommended for your system. These are prefixed with a * character in the --list output.

		 -R | --restart
			     Automatically restart (or shut down) if required to complete installation.

		 -a | --all  All updates that are applicable to your system, including those non-recommended ones, which are prefixed with a -
			     character in the --list output. (Non-recommended updates are uncommon in any case.)

		 item ...    One or more specified updates. The --list output shows the item names you can specify here, prefixed by the * or -
			     characters. See EXAMPLES.

     -d | --download
		 Each update specified by args is downloaded but not installed. The values of args are the same as for the --install command.
		 Updates downloaded with --download can be subsequently installed with --install, or through the App Store (as long as they remain
		 applicable to your system).  Updates are downloaded to /Library/Updates, but are not designed to be installed by double-clicking
		 the packages in that directory: always use --install or the App Store to actually perform the install.

     --ignore identifier ...
		 Manages the per-machine list of ignored updates. The identifier is the first part of the item name (before the dash and version
		 number) that is shown by --list.  See EXAMPLES.

     --reset-ignored
		 Clears the per-machine list of ignored updates.

     --schedule on | off
		 Manages the per-machine automatic (background) check preference.

     -h | --help
		 Print command usage.

EXAMPLES

     The following examples are shown as given to the shell:

     softwareupdate --list

	   Software Update Tool

	   Finding available software
	   Software Update found the following new or updated software:
	      * MacBookAirEFIUpdate2.4-2.4
		   MacBook Air EFI Firmware Update (2.4), 3817K [recommended] [restart]
	      * ProAppsQTCodecs-1.0
		   ProApps QuickTime codecs (1.0), 968K [recommended]
	      * JavaForOSX-1.0
		   Java for OS X 2012-005 (1.0), 65288K [recommended]

     sudo softwareupdate --install JavaForOSX-1.0

	   Software Update Tool

	   Finding available software

	   Downloading Java for OS X 2012-005
	   Downloaded Java for OS X 2012-005
	   Installing Java for OS X 2012-005
	   Done with Java for OS X 2012-005
	   Done.

     sudo softwareupdate --ignore JavaForOSX

	   Ignored updates:
	   (JavaForOSX)

     sudo softwareupdate --schedule

	   Automatic check is on

Mac OS								September 11, 2012							    Mac OS
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