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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 OSF1

netrc

netrc(4)						     Kernel Interfaces Manual							  netrc(4)

NAME

       netrc, .netrc - Specifies automatic login information for ftp

SYNOPSIS

       $HOME/.netrc

DESCRIPTION

       The  .netrc  file contains the information used by the automatic login (autologin) feature of the ftp command.  It is a hidden file in your
       home directory and must be owned by the user logging in, or by the root user.   If the .netrc file contains a login  password,  the  file's
       permissions must be set to 600 (read and write by owner only).

       The  .netrc file can contain the following entries (separated by spaces, tabs, or newlines): Where host is the name of a remote host.  This
       entry begins the definition of the autologin process for the specified host.  All following entries up to the next machine entry or the end
       of  the	file apply to that host.  This is the same as machine, except that default matches any name.  There can be only one default token,
       and it must appear after all machine tokens.  This is normally used as follows: default login anonymous password  user@site  The  preceding
       command	line gives the user automatic anonymous ftp login to machines not specified in .netrc.	This can be overriden by using the -n flag
       to disable autologin.  Where user is the username to use at the remote host.  If this entry is found, the  autologin  process  initiates  a
       login  using  the specified name.  If this entry is missing, the autologin process fails.  Where password is the login password to be used.
       The autologin process supplies this password to the remote server.  A login password must be established at the remote host and that  pass-
       word  must  be  entered	in  this  file, or the autologin process fails and you are prompted for the login password.  Where password is the
       account password to be used.  If this entry is found and an account password is required at the remote host, the autologin process supplies
       the  password  to  the  remote  server.	 If  the remote host requires an account password but this entry is missing, the autologin process
       prompts for the account password.  Where macro is the name of an ftp subcommand macro.  The macro definition starts on the  following  line
       and  is	defined  to  contain all of the following ftp subcommands up to the next blank line.  If the macro is named init, ftp executes the
       macro upon successful completion of the autologin process.

FILES

       Contains automatic login information.

RELATED INFORMATION

       Commands:  ftp(1).  delim off

																	  netrc(4)
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