#!/bin/sh -e

. /usr/share/debconf/confmodule

# Create the ssl-cert system group for snakeoil ownership:
if ! getent group ssl-cert >/dev/null; then
addgroup --quiet --system --force-badname ssl-cert
fi

check_vuln_version () {
if dpkg --compare-versions "$2" ge "$1" && dpkg --compare-versions "$2" lt $3 ; then
check_key="yes"
fi
}

# Check if the generated snakeoil key/cert has been generated
# from a vulnerable openssl version and replace it if necessary.
if [ -x /usr/bin/openssl-vulnkey -a -n "$2" ] ; then
check_key=""
check_vuln_version 0 "$2" 1.0.13-0ubuntu0.7.04.1
check_vuln_version 1.0.13-1 "$2" 1.0.14-0ubuntu0.7.10.1
check_vuln_version 1.0.14-0ubuntu1 "$2" 1.0.14-0ubuntu2.1
check_vuln_version 1.0.15 "$2" 1.0.19ubuntu1

CERT="/etc/ssl/certs/ssl-cert-snakeoil.pem"
KEY="/etc/ssl/private/ssl-cert-snakeoil.key"
# check if the cert and key file exist,
# the issuer and subject are the same (self signed cert)
# and the private key is vulnerable
if [ "${check_key}" = "yes" -a \
-e "${CERT}" -a -e "${KEY}" -a \
"$(openssl x509 -issuer -noout < ${CERT} | sed 's/issuer= //')" = "$(openssl x509 -subject -noout < ${CERT} | sed 's/subject= //')" ]; then
if ! openssl-vulnkey -q ${KEY}; then
db_version 2.0
db_input critical make-ssl-cert/vulnerable_prng || true
db_go
if [ ! -e ${CERT}.broken ] && [ ! -e ${KEY}.broken ] ; then
mv ${CERT} ${CERT}.broken
mv ${KEY} ${KEY}.broken
fi
make-ssl-cert generate-default-snakeoil --force-overwrite
fi
fi
fi

# no need to perform any check. If the certificates are there
# it will exit 0.
make-ssl-cert generate-default-snakeoil

# allow group ssl-cert to access /etc/ssl/private
if ! dpkg-statoverride --list /etc/ssl/private >/dev/null 2>&1
then
dpkg-statoverride --update --add root ssl-cert 710 /etc/ssl/private
fi

# If we're upgrading from an older version, fix the unreadable key:
if dpkg --compare-versions "$2" lt 1.0.12; then
chgrp ssl-cert /etc/ssl/private/ssl-cert-snakeoil.key
chmod g+r /etc/ssl/private/ssl-cert-snakeoil.key
fi