#!/bin/bash
#
# Sign a certificate request as a CA.  Run this on deleuze as an
# admin.  If a domain is provided, then the certificate request must
# apply only to that domain.
#
# Usage: ca-sign days request.csr outfile.pem [domain]

if test -n "$5" || test -z "$3"; then
    echo "Incorrect arguments."
    echo "Usage: ca-sign days request.csr outfile.pem [domain]"
    exit 1
fi

# Make sure we run this from deleuze
if test "$(hostname -s)" != "deleuze"; then
    echo "Error: This script must be run from deleuze."
    exit 1
fi

DIR=/var/local/lib/ca
CONF=$DIR/openssl.cnf
POLICY=policy_anything

# Certificate revocation list
CRL1=$DIR/crl-v1
CRL2=$DIR/crl-v2
CA_LOC=/afs/hcoop.net/user/h/hc/hcoop/public_html/ca

# Parameters
DAYS=$1
REQUEST=$2
PEM=$3
DOMAIN=$4

# Verify request
STATUS=$(openssl req -noout -in "$REQUEST" -verify 2>&1)
if test "$STATUS" != "verify OK"; then
    echo "Error: This is not a valid certificate request."
    exit 1
fi
if test -n "$DOMAIN"; then
    CN=$(openssl req -text -in "$REQUEST" | grep "Subject:" | grep "CN=." | \
        sed -r -e 's/^.*CN=([^/=,]+).*$/\1/1')
    if test "${CN%%${DOMAIN}}" = "${CN}"; then
        echo "Error: Domain in cert does not match $DOMAIN."
        exit 1
    fi
fi

# Get new serial number
ID=$(cat -- $DIR/serial)

# Exit on error
set -e

# Sign.
echo "Signing certificate request $REQUEST ..."
openssl ca -config $CONF -policy $POLICY -out $PEM -in $REQUEST -days $DAYS
echo

# Make a copy of the request
cp $REQUEST $DIR/requests/$ID.csr

# Update revocation list.
echo "Updating certificate revocation list ..."
openssl ca -config $CONF -batch -gencrl -crldays 30 -out $CRL1.pem
openssl crl -outform DER -out $CRL1.crl -in $CRL1.pem
openssl ca -config $CONF -batch -gencrl -crldays 30 -crlexts crl_ext \
    -out $CRL2.pem
openssl crl -outform DER -out $CRL2.crl -in $CRL2.pem
cp $CRL1.crl $CRL2.crl $CA_LOC
echo

echo "Don't forget to run ca-install to install the signed certificate!"