Login or Register to Ask a Question and Join Our Community

Sponsored Content
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..
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

SSH prompts password for non identical users

host1 & host2 : Solaris 10 - SPARC server From host1 able to ssh to host2 as same user with out password prompt. But, when ssh to different user in host2, it prompts for password DETAILS ======= In host1: 1) logged as root 2) ssh-keygen -t dsa -b 1024 (no pass phrase) 3)... (5 Replies)
Discussion started by: vjkatsun
5 Replies

2. Shell Programming and Scripting

sudo command with password

Hello everybody, Say I forgot my root password (shit happens, no?) and I'd like to brutally try 100 possibilities to delete a file using sudo. How can I make a script that tries all the passwords? The following doesn't work. Do you have a clue? foo:~$ cat test sudo rm dummy <<< 'password' echo... (1 Reply)
Discussion started by: chebarbudo
1 Replies

3. AIX

Sudo ask for password

Hello I have a partition with Aix 5.3 and I install sudo I put the commands that I want to use x user and I put the option that donkask for password. But when I run with this user and I try to run that commands. ask me for a password. I put this line for no ask for password with that... (2 Replies)
Discussion started by: lo-lp-kl
2 Replies

4. Red Hat

SSH Prompts for Password After Keys Setup Successfully

I setup the keys between 2 servers, but my user account has no password specified for it (never set one up on the account for security reasons). When I try to SSH to the server, SSH prompts for a password that doesn't exist (so I can never connect successfully). Note: 'passwd -d Rynok' removes... (3 Replies)
Discussion started by: Rynok
3 Replies

5. UNIX for Dummies Questions & Answers

Unable to use the Sudo command. "0509-130 Symbol resolution failed for sudo because:"

Hi! I'm very new to unix, so please keep that in mind with the level of language used if you choose to help :D Thanks! When attempting to use sudo on and AIX machine with oslevel 5.1.0.0, I get the following error: exec(): 0509-036 Cannot load program sudo because of the following errors:... (1 Reply)
Discussion started by: Chloe123
1 Replies

6. Shell Programming and Scripting

password getting displayed using sudo

Hi While doing the following command password is gettin dispalyed : ssh <host> "sudo command ; exit" .... while i type my password for 2nd its gettin displayed ... i tried stty -echo and stty echo ... still i am havin problem..:confused: (1 Reply)
Discussion started by: ningy
1 Replies

7. Red Hat

Sudo + Nohup = no password?

Little confused here When i go to run sudo nohup ./script.ksh & I dont get asked for a password. It starts a process ID, I can see it when i do a ps -ef | grep script. But I dont get an output file from my script, so its not doing anything. What gives? does it have to do the "&" ? ... (4 Replies)
Discussion started by: nitrobass24
4 Replies

8. Red Hat

Sudo Password Prompt over SSH

I am not sure what I am missing here. I have the following identical entry in /etc/sudoers on multiple Red Hat 6.4 servers. icinga ALL=NOPASSWD:/usr/bin/yum --security --exclude\="kernel*" check-update On one server when I enter the command over SSH as follows it works fine. ssh -t -q... (1 Reply)
Discussion started by: scotbuff
1 Replies

9. UNIX for Dummies Questions & Answers

Sudo ssh with command running in background

I am trying to run a command. This is one of my attempts: for i in fileservera; do ssh -t $i 'sudo ls /';doneThis works, and I see the directories. However, what I want to do now is start a process on the remote server such as /usr/bin/connectproc -standalonesudo /usr/bin/connectproc... (1 Reply)
Discussion started by: newbie2010
1 Replies

10. AIX

Sudo command prompt for a password

in the /etc/sudoer file this line was added: wtolentino ALL=(ORACLE) NOPASSWD: /bin/chmod when i tried to run this command sudo -u oracle /bin/chmod 775 /appshared/applications/lpa/executables/chrpt001.rep it prompts me for a password for example: $ pwd /appshared/applications/lpa... (2 Replies)
Discussion started by: wtolentino
2 Replies

LEARN ABOUT DEBIAN

csp_mkdircp

csp_helper(1)							  USER COMMANDS 						     csp_helper(1)

  NAME
      csp_helper - A collection of caspar helper scripts

  SYNOPSIS
      csp_install dir (directory) file (file)

      csp_mkdircp dir (directory) file (file)

      csp_scp_keep_mode h ([user@]host) dir (directory) file (file)

      csp_sucp h ([user@]host) dir (directory) file (file)

  DESCRIPTION
      The  scripts  csp_install,  csp_mkdircp,	csp_scp_keep_mode  and csp_sucp are helpers for caspar(7). These scripts typically are not invoked
      directly, but via a Makefile which uses caspar. See the notes on	csp_PUSH  in  caspar(7)  for  information  on  how  to	link  csp_install,
      csp_scp_keep_mode and csp_sucp to caspar.

  install DESCRIPTION
      csp_install creates the required directory (if needed) and installs the file, preserving timestamps. It uses install(1).

  install EXAMPLES
       csp_INSTALL_OPTIONS='--owner=www-data --group=www-data' 
	csp_INSTALL_MODE=ugo=r 
	csp_install /srv/www index.html

       csp_INSTALL_MODE=u=rwx,go= csp_install /usr/local/sbin mkpasswd

  install ENVIRONMENT
      csp_install honors csp_INSTALL_OPTIONS and csp_INSTALL_MODE (default is u=rw,go=r).

  mkdircp DESCRIPTION
      csp_mkdircp calls mkdir(1) and cp(1).

  scp_keep_mode DESCRIPTION
      csp_scp_keep_mode  uses  ssh to copy a file to a remote host, keeping its file permission mode. The trick used is a combination of mktemp(1)
      and mv(1).  Useful if you'd like to be sure a file gets installed e.g. group writable, without fiddling with permission bits on  the  remote
      host.

  scp_keep_mode EXAMPLE
	chmod g+w rc
	csp_scp_keep_mode root@gandalf /etc/uruk rc

  scp_keep_mode ENVIRONMENT
      csp_scp_keep_mode honors csp_SSH ("ssh" by default).

  sucp DESCRIPTION
      csp_sucp calls cat(1) from within sudo(1) from within ssh(1). This allows one to copy files to accounts on hosts one can only reach by call-
      ing sudo on the ssh-reachable remote host.

      Typically, one wants to install a root-owned file, but one does not want to allow access to the root-account directly  from  ssh.  Typically
      sudo is used as an extra line of defense.

  sucp EXAMPLES
      Some examples:

	csp_sucp rms@bilbo /etc fstab

	csp_sucp monty-python commit/ trailer.txt

  sucp BUGS
      If  NOPASSWD  is	not  set in the sudoers(5) file, and one's timestamp is expired, csp_sucp will forward the sudo password prompt. The given
      password will be echoed on the console!

  AUTHOR
      Joost van Baal-Ili

  SEE ALSO
      caspar(7) The caspar homepage is at http://mdcc.cx/caspar/ .

  csp_helper 20120514						      14 mai 2012						       csp_helper(1)
All times are GMT -4. The time now is 12:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy