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#!/bin/bash
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set -e
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# TODO:
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# - Parse params using argbash (argbash.io). Here's a template that I have tested but have not implemented yet:
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#
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# ARG_OPTIONAL_SINGLE([ca-url], , [the URL of the upstream (issuing) step-ca server])
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# ARG_OPTIONAL_SINGLE([fingerprint], , [the SHA256 fingerprint of the upstream peer step-ca server])
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# ARG_OPTIONAL_SINGLE([provisioner-name], , [the name of a JWK provisioner on the upstream CA that this RA will use])
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# ARG_OPTIONAL_SINGLE([provisioner-password-file], , [the name a file containing the upstream JWK provisioner password])
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# ARG_OPTIONAL_REPEATED([dns-name], , [DNS name of this RA that will appear on its TLS certificate; you may pass this flag multiple times])
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# ARG_OPTIONAL_SINGLE([listen-address], , [the address (and port #) this RA will listen on, eg. :443 or 127.0.0.1:4443])
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# ARG_HELP([This script will install and configure a Registration Authority that connects to an upstream CA running step-ca.])
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# ARGBASH_GO
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echo "This script will install and start a step-ca server running in Registration Authority (RA) mode."
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echo ""
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echo "You will need an upstream CA (URL and fingerprint)"
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echo "Don't have a CA? Sign up for a hosted CA at smallstep.com — or run your own."
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echo ""
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# Fail if this script is not run as root.
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if ! [ $(id -u) = 0 ]; then
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echo "This script must be run as root"
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exit 1
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fi
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# Architecture detection
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arch=$(uname -m)
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case $arch in
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x86_64) arch="amd64" ;;
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x86) arch="386" ;;
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i686) arch="386" ;;
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i386) arch="386" ;;
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aarch64) arch="arm64" ;;
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armv5*) arch="armv5" ;;
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armv6*) arch="armv6" ;;
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armv7*) arch="armv7" ;;
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esac
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if [ "$arch" = "armv5" ]; then
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echo "This script doesn't work on armv5 machines"
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exit 1
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fi
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if ! hash jq &> /dev/null; then
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echo "This script requires the jq commmand; please install it."
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exit 1
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fi
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if ! hash curl &> /dev/null; then
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echo "This script requires the curl commmand; please install it."
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exit 1
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fi
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if ! hash tar &> /dev/null; then
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echo "This script requires the tar commmand; please install it."
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exit 1
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fi
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while [ $# -gt 0 ]; do
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case "$1" in
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--ca-url)
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CA_URL="$2"
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shift
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shift
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;;
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--fingerprint)
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CA_FINGERPRINT="$2"
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shift
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shift
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;;
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--provisioner-name)
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CA_PROVISIONER_NAME="$2"
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shift
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shift
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;;
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--provisioner-password-file)
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CA_PROVISIONER_JWK_PASSWORD_FILE="$2"
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shift
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shift
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;;
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--dns-names)
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RA_DNS_NAMES="$2"
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shift
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shift
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;;
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--listen-address)
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RA_ADDRESS="$2"
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shift
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shift
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;;
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*)
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shift
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;;
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esac
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done
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# Install step
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if ! hash step &> /dev/null; then
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echo "Installing 'step' in /usr/bin..."
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STEP_VERSION=$(curl -s https://api.github.com/repos/smallstep/cli/releases/latest | jq -r '.tag_name')
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curl -sLO https://github.com/smallstep/cli/releases/download/$STEP_VERSION/step_linux_${STEP_VERSION:1}_$arch.tar.gz
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tar xvzf step_linux_${STEP_VERSION:1}_$arch.tar.gz
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install -m 0755 -t /usr/bin step_${STEP_VERSION:1}/bin/step
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rm step_linux_${STEP_VERSION:1}_$arch.tar.gz
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rm -rf step_${STEP_VERSION:1}
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fi
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# Prompt for required parameters
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if [ -z "$CA_URL" ]; then
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CA_URL=""
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while [[ $CA_URL = "" ]]; do
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read -p "Issuing CA URL: " CA_URL < /dev/tty
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done
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fi
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if [ -z "$CA_FINGERPRINT" ]; then
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CA_FINGERPRINT=""
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while [[ $CA_FINGERPRINT = "" ]]; do
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read -p "Issuing CA Fingerprint: " CA_FINGERPRINT < /dev/tty
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done
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fi
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echo "Bootstrapping with the CA..."
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export STEPPATH=$(mktemp -d)
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export STEP_CONSOLE=true
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step ca bootstrap --ca-url $CA_URL --fingerprint $CA_FINGERPRINT
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if [ -z "$CA_PROVISIONER_NAME" ]; then
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declare -a provisioners
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readarray -t provisioners < <(step ca provisioner list | jq -r '.[] | select(.type == "JWK") | .name')
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provisioners+=("Create provisioner")
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printf '%s\n' "${provisioners[@]}"
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printf "%b" "\nSelect a JWK provisioner:\n" >&2
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select provisioner in "${provisioners[@]}"; do
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if [ "$provisioner" == "Create provisioner" ]; then
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echo "Creating a JWK provisioner on the upstream CA..."
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echo ""
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read -p "Label your provisioner (e.g. example-ra): " CA_PROVISIONER_NAME < /dev/tty
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step beta ca provisioner add $CA_PROVISIONER_NAME --type JWK --create
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break
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elif [ -n "$provisioner" ]; then
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echo "Using existing provisioner $provisioner."
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CA_PROVISIONER_NAME=$provisioner
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break
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else
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echo "Invalid selection!"
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fi
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done
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fi
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if [ -z "$RA_DNS_NAMES" ]; then
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RA_DNS_NAMES=""
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while [[ $RA_DNS_NAMES = "" ]]; do
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echo "What DNS names or IP addresses will your RA use?"
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read -p "(e.g. acme.example.com[,1.1.1.1,etc.]): " RA_DNS_NAMES < /dev/tty
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done
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fi
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if [ -z "$RA_ADDRESS" ]; then
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RA_ADDRESS=""
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while [[ $RA_ADDRESS = "" ]] ; do
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echo "What address should your RA listen on?"
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read -p "(e.g. :443 or 10.2.1.201:4430): " RA_ADDRESS < /dev/tty
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done
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fi
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if [ -z "$CA_PROVISIONER_JWK_PASSWORD_FILE" ]; then
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read -s -p "Enter the CA Provisioner Password: " CA_PROVISIONER_JWK_PASSWORD < /dev/tty
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printf "%b" "\n"
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fi
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echo "Installing 'step-ca' in /usr/bin..."
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CA_VERSION=$(curl -s https://api.github.com/repos/smallstep/certificates/releases/latest | jq -r '.tag_name')
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curl -sLO https://github.com/smallstep/certificates/releases/download/$CA_VERSION/step-ca_linux_${CA_VERSION:1}_$arch.tar.gz
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tar -xf step-ca_linux_${CA_VERSION:1}_$arch.tar.gz
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install -m 0755 -t /usr/bin step-ca_${CA_VERSION:1}/bin/step-ca
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setcap CAP_NET_BIND_SERVICE=+eip $(which step-ca)
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rm step-ca_linux_${CA_VERSION:1}_$arch.tar.gz
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rm -rf step-ca_${CA_VERSION:1}
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echo "Creating 'step' user..."
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export STEPPATH=/etc/step-ca
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useradd --system --home $(step path) --shell /bin/false step
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echo "Creating RA configuration..."
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mkdir -p $(step path)/db
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mkdir -p $(step path)/config
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cat <<EOF > $(step path)/config/ca.json
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{
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"address": "$RA_ADDRESS",
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"dnsNames": ["$RA_DNS_NAMES"],
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"db": {
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"type": "badgerV2",
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"dataSource": "/etc/step-ca/db"
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},
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"logger": {"format": "text"},
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"authority": {
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"type": "stepcas",
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"certificateAuthority": "$CA_URL",
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"certificateAuthorityFingerprint": "$CA_FINGERPRINT",
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"certificateIssuer": {
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"type" : "jwk",
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"provisioner": "$CA_PROVISIONER_NAME"
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},
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"provisioners": [{
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"type": "ACME",
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"name": "acme"
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}]
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},
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"tls": {
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"cipherSuites": [
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"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
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"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"
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],
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"minVersion": 1.2,
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"maxVersion": 1.3,
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"renegotiation": false
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}
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}
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EOF
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if ! [ -z "$CA_PROVISIONER_JWK_PASSWORD" ]; then
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echo "Saving provisoiner password to $(step path)/password.txt..."
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echo $CA_PROVISIONER_JWK_PASSWORD > $(step path)/password.txt
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else
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echo "Copying provisioner password file to $(step path)/password.txt..."
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cp $CA_PROVISIONER_JWK_PASSWORD_FILE $(step path)/password.txt
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fi
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chmod 440 $(step path)/password.txt
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# Add a service to systemd for the RA.
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echo "Creating systemd service step-ca.service..."
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curl -sL https://raw.githubusercontent.com/smallstep/certificates/master/systemd/step-ca.service \
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-o /etc/systemd/system/step-ca.service
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echo "Creating RA mode override /etc/systemd/system/step-ca.service.d/local.conf..."
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mkdir /etc/systemd/system/step-ca.service.d
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cat <<EOF > /etc/systemd/system/step-ca.service.d/local.conf
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[Service]
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; The empty ExecStart= clears the inherited ExecStart= value
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ExecStart=
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ExecStart=/usr/bin/step-ca config/ca.json --issuer-password-file password.txt
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EOF
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echo "Starting step-ca.service..."
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systemctl daemon-reload
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chown -R step:step $(step path)
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systemctl enable --now step-ca
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echo "Adding STEPPATH export to /root/.bash_profile..."
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echo "export STEPPATH=$STEPPATH" >> /root/.bash_profile
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echo "Finished. Check the journal with journalctl -fu step-ca.service"
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Mariano Cano
3 years ago
committed by
GitHub