#!/bin/bash

if [ $# -eq 0 ]; then
	echo $"Usage: `basename $0` filename" 1>&2
	exit 1
fi

PEM=$1
REQ=`/bin/mktemp /tmp/openssl.XXXXXX`
KEY=`/bin/mktemp /tmp/openssl.XXXXXX`
CRT=`/bin/mktemp /tmp/openssl.XXXXXX`
NEW=${PEM}_

trap "rm -f $REQ $KEY $CRT $NEW" SIGINT

if [ ! -f $PEM ]; then
	echo "$PEM: file not found" 1>&2
	exit 1
fi

let -a SERIAL=0x$(openssl x509 -in $PEM -noout -serial | cut -d= -f2)
let SERIAL++

umask 077

OWNER=`ls -l $PEM | awk '{ printf "%s.%s", $3, $4; }'`

openssl rsa -inform pem -in $PEM -out $KEY
openssl x509 -x509toreq -in $PEM -signkey $KEY -out $REQ
openssl x509 -req -in $REQ -signkey $KEY -set_serial $SERIAL -days 365 \
	-extfile /etc/pki/tls/openssl.cnf -extensions v3_ca -out $CRT

(cat $KEY ; echo "" ; cat $CRT) > $NEW

chown $OWNER $NEW

mv -f $NEW $PEM

rm -f $REQ $KEY $CRT

exit 0