mk-passwd-hash

#!/usr/bin/ruby
#
# This script will prompt for a password and then output
# a hash which may be used with 'usermod'.
#
# Using usermod you can script the changine of passwords
# for users.
#
# NOTE: Intentionally doesn't allow passwords to be entered
#       via the command-line.
#


#
#  The random pool from which salts will be taken.
#
SALT = ([*('/' '.'),*('A'..'Z'),*('a'..'z'), *('0'..'9')]).sample(8).join


#
#  Prompt for the password, twice to be sure.
#
puts "Please enter your plaintext password:"
pass1 = gets().chomp

puts "Please confirm your password:"
pass2 = gets().chomp


#
#  Ensure they match
#
if ( pass1 != pass2 )
  puts "Your passwords did not match.  Aborting"
  exit 1
end


#
#  Do the magic.
#
hash = pass1.crypt("$1$"+8.times.collect{SALT[rand(SALT.length)]}.join+"$")


#
#  We're done.
#
puts "Your hash is \t#{hash}\n"
exit(0)