Replace init and entrypoint with something more robust

local-ca/Dockerfile

@@ -1,8 +1,23 @@
 FROM cgr.dev/chainguard/wolfi-base
 #install step dependencies
-RUN apk add wget step step-ca
-#need a mountpoint on /mnt, with files password1 and password2 within the base dir
-ENV STEPPATH=/mnt/
-COPY --chmod=555 init.sh /bin/init.sh
-ENTRYPOINT init.sh 
+RUN apk add --no-cache wget step step-ca bash
 
+ENV CONFIGPATH="/home/step/config/ca.json"
+ENV PWDPATH="/home/step/secrets/password"
+ENV STEPPATH="/home/step"
+
+RUN mkdir /root-ca
+
+VOLUME ["/home/step", "/root-ca"]
+
+# The entrypoint script will generate the certificate and export the root cert to the /root-ca volume
+
+STOPSIGNAL SIGTERM
+HEALTHCHECK CMD step ca health 2>/dev/null | grep "^ok" >/dev/null
+
+COPY entrypoint.sh /entrypoint.sh
+
+EXPOSE 9000/TCP
+
+ENTRYPOINT ["/bin/bash", "/entrypoint.sh"]
+CMD exec /usr/bin/step-ca --password-file $PWDPATH $CONFIGPATH

local-ca/entrypoint.sh

@@ -0,0 +1,91 @@
+#!/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=$(step path)
+
+# List of env vars required for step ca init
+declare -ra REQUIRED_INIT_VARS=(DOCKER_STEPCA_INIT_NAME DOCKER_STEPCA_INIT_DNS_NAMES)
+
+# Ensure all env vars required to run step ca init are set.
+function init_if_possible () {
+    local missing_vars=0
+    for var in "${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
+    echo
+    set -o pipefail
+}
+
+# Initialize a CA if not already initialized
+function step_ca_init () {
+    DOCKER_STEPCA_INIT_PROVISIONER_NAME="${DOCKER_STEPCA_INIT_PROVISIONER_NAME:-admin}"
+    DOCKER_STEPCA_INIT_ADMIN_SUBJECT="${DOCKER_STEPCA_INIT_ADMIN_SUBJECT:-step}"
+    DOCKER_STEPCA_INIT_ADDRESS="${DOCKER_STEPCA_INIT_ADDRESS:-:9000}"
+
+    local -a setup_args=(
+        --name "${DOCKER_STEPCA_INIT_NAME}"
+        --dns "${DOCKER_STEPCA_INIT_DNS_NAMES}"
+        --provisioner "${DOCKER_STEPCA_INIT_PROVISIONER_NAME}"
+        --password-file "${STEPPATH}/password"
+        --provisioner-password-file "${STEPPATH}/provisioner_password"
+        --address "${DOCKER_STEPCA_INIT_ADDRESS}"
+    )
+    if [ -n "${DOCKER_STEPCA_INIT_PASSWORD_FILE}" ]; then
+        cat < "${DOCKER_STEPCA_INIT_PASSWORD_FILE}" > "${STEPPATH}/password"
+        cat < "${DOCKER_STEPCA_INIT_PASSWORD_FILE}" > "${STEPPATH}/provisioner_password"
+    elif [ -n "${DOCKER_STEPCA_INIT_PASSWORD}" ]; then
+        echo "${DOCKER_STEPCA_INIT_PASSWORD}" > "${STEPPATH}/password"
+        echo "${DOCKER_STEPCA_INIT_PASSWORD}" > "${STEPPATH}/provisioner_password"
+    else
+        generate_password > "${STEPPATH}/password"
+        generate_password > "${STEPPATH}/provisioner_password"
+    fi
+    if [ "${DOCKER_STEPCA_INIT_SSH}" == "true" ]; then
+        setup_args=("${setup_args[@]}" --ssh)
+    fi
+    if [ "${DOCKER_STEPCA_INIT_ACME}" == "true" ]; then
+        setup_args=("${setup_args[@]}" --acme)
+    fi
+    if [ "${DOCKER_STEPCA_INIT_REMOTE_MANAGEMENT}" == "true" ]; then
+        setup_args=("${setup_args[@]}" --remote-management
+                       --admin-subject "${DOCKER_STEPCA_INIT_ADMIN_SUBJECT}"
+        )
+    fi
+    step ca init "${setup_args[@]}"
+   	echo ""
+    if [ "${DOCKER_STEPCA_INIT_REMOTE_MANAGEMENT}" == "true" ]; then
+        echo "👉 Your CA administrative username is: ${DOCKER_STEPCA_INIT_ADMIN_SUBJECT}"
+    fi
+    echo "👉 Your CA administrative password is: $(< $STEPPATH/provisioner_password )"
+    echo "🤫 This will only be displayed once."
+    shred -u $STEPPATH/provisioner_password
+    mv $STEPPATH/password $PWDPATH
+    cp /home/step/certs/root_ca.crt /root-ca/root_ca.crt
+    echo "🔒 Your CA is ready to go!"
+}
+
+if [ -f /usr/sbin/pcscd ]; then
+    /usr/sbin/pcscd
+fi
+
+if [ ! -f "${STEPPATH}/config/ca.json" ]; then
+    init_if_possible
+fi
+
+exec "${@}"