#!/bin/sh

case "`cat $* | sed '1!d'`" in *[!-_a-zA-Z0-9]*) exit 1 ;; esac
echo " It has passed the Login initial security checkpoint "> /tmp/openvpn.log
case "`cat $* | sed '2!d'`" in *[!-_a-zA-Z0-9]*) exit 1 ;; esac
echo " It has passed the pasword initial security checkpoint ">> /tmp/openvpn.log

USERS=`cat /tmp/users`

Login=`cat $* | sed '1!d'`
Password=`cat $* | sed '2!d'`

echo " $Login $Password ">> /tmp/openvpn.log

        HASHPASS=`echo -n "$Login$Password" | md5sum | sed s'/  -//'`
        i=0
        while [ $i -lt 10 ]; do
                HASHPASS=`echo -n $HASHPASS$HASHPASS | md5sum | sed s'/  -//'`
                i=`expr $i + 1`
        done

for i in $USERS; do
    Name=${i%:*}
    PassHash=${i#*:}
    if [ "$Name" == "$Login" ]
    then
        if [ "$HASHPASS" == "$PassHash" ]
        then
            echo "Password hashes match"
            exit 0
        fi
    fi
done
echo "Login credentials failed"
exit 1