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Reading password from /dev/tty

 
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# 1  
Old 01-30-2012
Reading password from /dev/tty
hi,
From the below script:
Code:
##########################################pwd_auth.sh########################################################################################
#Author: Pandeeswaran Bhoopathy
#Written on:26th Jan 2012 2:00PM
#This script describes the feature of stty and illustrates the authentication mechanism
#############################################################################################################################################
#!/usr/bin/bash
printf "Enter the password:\n"
stty -echo 
read password </dev/tty
printf "Enter the passwrd again:\n"
read passwrd1</dev/tty
if [ $password = $passwrd1 ]
then
echo "Both the passwords match\n"
else
printf "Passwords do not match\n"
fi
stty echo

is it possible to print the password intermediately in the above script?i.e:is it possible to read the password from /dev/tty?
Similarly, while using
Code:
read -s

,can we retrieve the typed text from where its getting stored . i guess it's /proc/core.but i am unable to retrieve from there.
Please help me.

Thanks
# 2  
Old 01-30-2012
Why do you want to?

How to do so can vary from system to system, and even the manner the password is stored in can vary. You need root access to do so anyway, which makes it fairly useless unless you've got control of the machine anyway. Extracting a password from memory is like trying to read a hard drive with an electron microscope; might be technically possible, but an exercise in frustration, and used only in desperate (or fraudulent) circumstances.
# 3  
Old 01-30-2012
Yes/i just want to try in my system. Actuall y i have created that script for understanding the concept of stty. so out of curious,i am asking how to read the text from /dev/tty.
Thanks
# 4  
Old 01-30-2012
You can see how to read text from /dev/tty:

Code:
read < /dev/tty

If you want to rip variable values from memory, I can't help you.
 
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