#!/usr/bin/perl -w
use strict;
$|++;

#------------------------------------------------------------------------------
# Basic Auth and entitlement function set.  Read perldoc -f crypt for a tad
# more information on crypt and salt (contains a nice function for random
# salt).  Then go on and read many more tomes to get a tad more information :)
#------------------------------------------------------------------------------

my ( $username, $passwd ) = @ARGV;
if ( my $permissions = &check_passwd( $username, $passwd ) ) {
  print "$username is $permissions\n";
} else {
 print "authentication failed\n";
}

##
# check_passwd( $username, $password );
#
# returns group or permissions or whatever you have in the third column of your
# passwd file if username and password match
#
sub check_passwd ($$) {
  my ($input_username, $input_passwd) = @_;
  while (<DATA>) {
    my ($username, $crypted_passwd, $permissions)  = split ':';
    next unless $input_username eq $username;
    my $crypted_input_passwd = crypt($input_passwd, $crypted_passwd);
    if ( $crypted_input_passwd eq $crypted_passwd ) {
      chomp( $permissions );
      return $permissions;
    }
  }
  return;
}


##
# DATA file description and data (with unencrypted passwords, for testing)
#
# username:passwd:permissions
# nob:bob:god
# rim:tim:angel
# hal:kal:devil
##

__DATA__
nob:a1ni5aPmumc2E:god
rim:jZR4taPdoUdwA:angel
hal:0ZYFuJV/xWRvc:devil