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|
#!/bin/sh -e
DEFAULT_ORG="Asterisk"
DEFAULT_CA_CN="Asterisk Private CA"
DEFAULT_CLIENT_CN="asterisk"
DEFAULT_SERVER_CN=`hostname -f`
# arguments
# $1 "ca" if we are to generate a CA cert
# $2 alternate config file name (for ca)
# $3 alternate common name
# $4 alternate org name
create_config () {
if [ "$1" = "ca" ]
then
castring="
[ext]
basicConstraints=CA:TRUE"
fi
cat > ${2:-"${CONFIG_FILE}"} << EOF
[req]
distinguished_name = req_distinguished_name
prompt = no
[req_distinguished_name]
CN=${3:-"${COMMON_NAME}"}
O=${4:-"${ORG_NAME}"}
${castring}
EOF
}
create_ca () {
echo "Creating CA key ${CAKEY}"
openssl genrsa -des3 -out ${CAKEY} 4096 > /dev/null
if [ $? -ne 0 ];
then
echo "Failed"
exit 1
fi
echo "Creating CA certificate ${CACERT}"
openssl req -new -config ${CACFG} -x509 -days 365 -key ${CAKEY} -out ${CACERT} > /dev/null
if [ $? -ne 0 ];
then
echo "Failed"
exit 1
fi
}
create_cert () {
local base=${OUTPUT_DIR}/${OUTPUT_BASE}
echo "Creating certificate ${base}.key"
openssl genrsa -out ${base}.key 1024 > /dev/null
if [ $? -ne 0 ];
then
echo "Failed"
exit 1
fi
echo "Creating signing request ${base}.csr"
openssl req -batch -new -config ${CONFIG_FILE} -key ${base}.key -out ${base}.csr > /dev/null
if [ $? -ne 0 ];
then
echo "Failed"
exit 1
fi
echo "Creating certificate ${base}.crt"
openssl x509 -req -days 365 -in ${base}.csr -CA ${CACERT} -CAkey ${CAKEY} -set_serial 01 -out ${base}.crt > /dev/null
if [ $? -ne 0 ];
then
echo "Failed"
exit 1
fi
echo "Combining key and crt into ${base}.pem"
cat ${base}.key > ${base}.pem
cat ${base}.crt >> ${base}.pem
}
usage () {
cat << EOF
This script is useful for quickly generating self-signed CA, server, and client
certificates for use with Asterisk. It is still recommended to obtain
certificates from a recognized Certificate Authority and to develop an
understanding how SSL certificates work. Real security is hard work.
OPTIONS:
-h Show this message
-m Type of cert "client" or "server". Defaults to server.
-f Config filename (openssl config file format)
-c CA cert filename (creates new CA cert/key as ca.crt/ca.key if not passed)
-k CA key filename
-C Common name (cert field)
This should be the fully qualified domain name or IP address for
the client or server. Make sure your certs have unique common
names.
-O Org name (cert field)
An informational string (company name)
-o Output filename base (defaults to asterisk)
-d Output directory (defaults to the current directory)
Example:
To create a CA and a server (pbx.mycompany.com) cert with output in /tmp:
ast_tls_cert -C pbx.mycompany.com -O "My Company" -d /tmp
This will create a CA cert and key as well as asterisk.pem and the the two
files that it is made from: asterisk.crt and asterisk.key. Copy asterisk.pem
and ca.crt somewhere (like /etc/asterisk) and set tlscertfile=/etc/asterisk.pem
and tlscafile=/etc/ca.crt. Since this is a self-signed key, many devices will
require you to import the ca.crt file as a trusted cert.
To create a client cert using the CA cert created by the example above:
ast_tls_cert -m client -c /tmp/ca.crt -k /tmp/ca.key -C phone1.mycompany.com \\
-O "My Company" -d /tmp -o joe_user
This will create client.crt/key/pem in /tmp. Use this if your device supports
a client certificate. Make sure that you have the ca.crt file set up as
a tlscafile in the necessary Asterisk configs. Make backups of all .key files
in case you need them later.
EOF
}
if ! type openssl >/dev/null 2>&1
then
echo "This script requires openssl to be in the path"
exit 1
fi
OUTPUT_BASE=asterisk # Our default cert basename
CERT_MODE=server
ORG_NAME=${DEFAULT_ORG}
while getopts "hf:c:k:o:d:m:C:O:" OPTION
do
case ${OPTION} in
h)
usage
exit 1
;;
f)
CONFIG_FILE=${OPTARG}
;;
c)
CACERT=${OPTARG}
;;
k)
CAKEY=${OPTARG}
;;
o)
OUTPUT_BASE=${OPTARG}
;;
d)
OUTPUT_DIR=${OPTARG}
;;
m)
CERT_MODE=${OPTARG}
;;
C)
COMMON_NAME=${OPTARG}
;;
O)
ORG_NAME=${OPTARG}
;;
?)
usage
exit
;;
esac
done
if [ -z "${OUTPUT_DIR}" ]
then
OUTPUT_DIR=.
else
mkdir -p "${OUTPUT_DIR}"
fi
umask 177
case "${CERT_MODE}" in
server)
COMMON_NAME=${COMMON_NAME:-"${DEFAULT_SERVER_CN}"}
;;
client)
COMMON_NAME=${COMMON_NAME:-"${DEFAULT_CLIENT_CN}"}
;;
*)
echo
echo "Unknown mode. Exiting."
exit 1
;;
esac
if [ -z "${CONFIG_FILE}" ]
then
CONFIG_FILE="${OUTPUT_DIR}/tmp.cfg"
echo
echo "No config file specified, creating '${CONFIG_FILE}'"
echo "You can use this config file to create additional certs without"
echo "re-entering the information for the fields in the certificate"
create_config
fi
if [ -z ${CACERT} ]
then
CAKEY=${OUTPUT_DIR}/ca.key
CACERT=${OUTPUT_DIR}/ca.crt
CACFG=${OUTPUT_DIR}/ca.cfg
if [ ! -r "$CAKEY" ] && [ ! -r "$CACFG" ]; then
create_config ca "${CACFG}" "${DEFAULT_CA_CN}" "${DEFAULT_CA_ORG}"
fi
if [ ! -r "$CACERT" ]; then
create_ca
fi
else
if [ -z ${CAKEY} ]
then
echo "-k must be specified if -c is"
exit 1
fi
fi
create_cert
|
