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#!/bin/sh
# $Id: alcasar-CA.sh 2924 2021-02-23 21:42:48Z rexy $

# alcasar-CA.sh
# by Franck BOUIJOUX (3abtux), Pascal LEVANT and Richard REY (Rexy)
# This script is distributed under the Gnu General Public License (GPL)
#
# Some ideas from "nessus-mkcert" script written by Renaud Deraison <deraison@cvs.nessus.org>
# and Michel Arboi <arboi@alussinan.org>
#
DIR_TMP=${TMPDIR-/tmp}/alcasar-mkcert.$$
DIR_PKI=/etc/pki
DIR_CERT=$DIR_PKI/tls
DIR_WEB=/var/www/html
CACERT=$DIR_PKI/CA/alcasar-ca.crt
CAKEY=$DIR_PKI/CA/private/alcasar-ca.key
SRVREQ=$DIR_CERT/alcasar.req
SRVKEY=$DIR_CERT/private/alcasar.key
SRVCERT=$DIR_CERT/certs/alcasar.crt
SRVPEM=$DIR_CERT/private/alcasar.pem
SRVCHAIN=$DIR_CERT/certs/server-chain.pem
CONF_FILE="/usr/local/etc/alcasar.conf"
hostname=`grep ^HOSTNAME= $CONF_FILE|cut -d"=" -f2`
domain=`grep ^DOMAIN= $CONF_FILE|cut -d"=" -f2`
domain=${domain:=localdomain}
fqdn_hostname="$hostname.$domain"
# The value for organizationalUnitName must be 64 chars or less;
#   thus, hostname must be 36 chars or less. If it's too big,
#   try removing domain (merci REXY ;-) ).
hostname_len=`echo $fqdn_hostname| wc -c`
if [ $hostname_len -gt 36 ];
then
        fqdn_hostname=$hostname
fi
private_ip=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2|cut -d"/" -f1`

CACERT_LIFETIME="1460"
SRVCERT_LIFETIME="1460"
COUNTRY="FR"
PROVINCE="none"
LOCATION="Paris"
ORGANIZATION="ALCASAR-Team"

mkdir $DIR_TMP || exit 1
[ -d $DIR_PKI/CA/private ] || mkdir -p $DIR_PKI/CA/private ; chown -R root:root $DIR_PKI/CA ; chmod -R 750 $DIR_PKI/CA
# dynamic conf file for openssl
cat <<EOF >$DIR_TMP/ssl.conf
RANDFILE                = $HOME/.rnd
#
[ca]
default_ca = AlcasarCA

[AlcasarCA]
dir             = $DIR_TMP              # Where everything is kept
certs           = \$dir                 # Where the issued certs are kept
crl_dir         = \$dir                 # Where the issued crl are kept
database        = \$dir/index.txt       # database index file.
new_certs_dir   = \$dir                 # default place for new certs.
certificate     = $CACERT               # The CA certificate
serial          = \$dir/serial          # The current serial number
crl             = \$dir/crl.pem         # The current CRL
private_key     = $CAKEY                # The private key
x509_extensions = usr_cert              # The extentions to add to the cert
crl_extensions  = crl_ext
default_days    = 365                   # how long to certify for
default_crl_days= 30                    # how long before next CRL
default_md      = sha256                # which message digest to use.
preserve        = no                    # keep passed DN ordering
policy          = policy_anything

[policy_anything]
countryName             = optional
stateOrProvinceName     = optional
localityName            = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[req]
default_bits            = 2048
distinguished_name      = req_distinguished_name
# attributes            = req_attributes
x509_extensions         = v3_ca         # The extentions to add to the self signed cert

[ v3_ca ]
subjectKeyIdentifier    = hash
authorityKeyIdentifier  = keyid:always,issuer:always
basicConstraints        = critical,CA:true
keyUsage                = cRLSign, keyCertSign
nsCertType              = sslCA

[req_distinguished_name]
countryName                     = Country Name (2 letter code)
countryName_default             = FR
countryName_min                 = 2
countryName_max                 = 2
stateOrProvinceName             = State or Province Name (full name)
stateOrProvinceName_default     = Some-State
localityName                    = Locality Name (eg, city)
localityName_default            = Lyon
0.organizationName              = Organization Name (eg, company)
0.organizationName_default      = your organization name
organizationalUnitName          = Organizational Unit Name (eg, section)
commonName                      = Common Name (eg, your name or your server\'s hostname)
commonName_max                  = 255
emailAddress                    = Email Address
emailAddress_max                = 255

[usr_cert]
nsCertType                      = server
subjectKeyIdentifier            = hash
authorityKeyIdentifier          = keyid,issuer
basicConstraints                = CA:FALSE
keyUsage                        = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
issuerAltName                   = issuer:copy
subjectAltName                  = @alt_names

[alt_names]
DNS.1                           = $fqdn_hostname
IP.1                            = $private_ip
EOF

CAMAIL=
SRVMAIL=
echo 01 > $DIR_TMP/serial
touch $DIR_TMP/index.txt

# CA key
rm -f $CAKEY
echo "*********CAKEY*********" > $DIR_TMP/openssl-log
openssl genrsa -out $CAKEY 2048 2>> $DIR_TMP/openssl-log

# CA certificate
rm -f $CACERT
echo >> $DIR_TMP/openssl-log
echo "*********CACERT*********" >> $DIR_TMP/openssl-log
echo "$COUNTRY
$PROVINCE
$LOCATION
$ORGANIZATION
Certification Authority for $fqdn_hostname
$fqdn_hostname-local-CA
$CAMAIL" | 
openssl req -config $DIR_TMP/ssl.conf -new -x509 -sha256 -days $CACERT_LIFETIME -key $CAKEY -out $CACERT 2>> $DIR_TMP/openssl-log

# Server key
rm -f $SRVKEY   
echo >> $DIR_TMP/openssl-log
echo "*********SRVKEY*********" >> $DIR_TMP/openssl-log
openssl genrsa -out $SRVKEY 2048 2>> $DIR_TMP/openssl-log

# Server certificate "request"
echo >> $DIR_TMP/openssl-log
echo "*********SRVRQST*********" >> $DIR_TMP/openssl-log
echo "$COUNTRY
$PROVINCE
$LOCATION
$ORGANIZATION
Server certificate for $fqdn_hostname
$fqdn_hostname
$SRVMAIL" | 
openssl req -config $DIR_TMP/ssl.conf -new -key $SRVKEY -out $SRVREQ 2>> $DIR_TMP/openssl-log

# Sign the server certificate "request" to create server certificate
rm -f $SRVCERT
echo >> $DIR_TMP/openssl-log
echo "*********SRVCERT*********" >> $DIR_TMP/openssl-log
openssl ca -config $DIR_TMP/ssl.conf -name AlcasarCA -batch -days $SRVCERT_LIFETIME -in $SRVREQ -out $SRVCERT 2>> $DIR_TMP/openssl-log
rm -f $SRVREQ

(cat $SRVKEY; echo; cat $SRVCERT) > $SRVPEM
cp -f $CACERT $SRVCHAIN

# Limit rights
chown -R root:root $SRVKEY $CAKEY
chmod -R 0600 $SRVKEY $CAKEY

# Link certs in ALCASAR Control Center
if [ -s "$CACERT" -a -s "$CAKEY" -a -s "$SRVCERT" -a -s "$SRVKEY" ];
        then
        [ -d $DIR_WEB/certs ] || mkdir -p $DIR_WEB/certs
        rm -f $DIR_WEB/certs/*
        ln -s $CACERT $DIR_WEB/certs/certificat_alcasar_ca.crt
        ln -s $SRVCERT $DIR_WEB/certs/certificat_alcasar.crt
        rm -rf $DIR_TMP
        exit 0
else
        echo "An error occured when generating security certificates (see : $DIR_TMP/openssl-log)" 
        exit 1
fi