certificates/docker/entrypoint.sh
2021-08-18 11:11:05 -07:00

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#!/bin/bash
set -eo pipefail
# Paraphrased from:
# https://github.com/influxdata/influxdata-docker/blob/0d341f18067c4652dfa8df7dcb24d69bf707363d/influxdb/2.0/entrypoint.sh
# (a repo with no LICENSE.md)
export STEPPATH=$(step path)
# List of env vars required for step ca init
declare -ra REQUIRED_INIT_VARS=(DOCKER_STEPCA_INIT_NAME DOCKER_STEPCA_INIT_DNS DOCKER_STEPCA_INIT_EMAIL)
# optional:
# DOCKER_STEPCA_INIT_PASSWORD (initial CA password)
# DOCKER_STEPCA_INIT_SSH (boolean: given a non-empty value, create an SSH CA)
# Ensure all env vars required to run step ca init are set.
function init_if_possible () {
local missing_vars=0
for var in "${REQUIRED_INIT_VARS[@]}"; do
if [ -z "${!var}" ]; then
missing_vars=1
fi
done
if [ ${missing_vars} = 1 ]; then
>&2 echo "there is no ca.json config file; please run step ca init, or provide config parameters via DOCKER_STEPCA_INIT_ vars"
else
step_ca_init "${@}"
fi
}
function generate_password () {
set +o pipefail
< /dev/urandom tr -dc A-Za-z0-9 | head -c40
set -o pipefail
}
# Initialize a CA if not already initialized
function step_ca_init () {
local -a setup_args=(
--name "${DOCKER_STEPCA_INIT_NAME}"
--dns "${DOCKER_STEPCA_INIT_DNS}"
--provisioner "${DOCKER_STEPCA_INIT_EMAIL}"
--password-file "${STEPPATH}/password"
--address ":9000"
)
if [ -n "${DOCKER_STEPCA_INIT_PASSWORD}" ]; then
echo -n "${DOCKER_STEPCA_INIT_PASSWORD}" > "${STEPPATH}/password"
else
generate_password > "${STEPPATH}/password"
fi
if [ -n "${DOCKER_STEPCA_INIT_SSH}" ]; then
setup_args=("${setup_args[@]}" --ssh)
fi
step ca init "${setup_args[@]}"
mv $STEPPATH/password $PWDPATH
}
if [ ! -f "${STEPPATH}/config/ca.json" ]; then
init_if_possible
fi
exec "${@}"