change(docker): use step-ca for CA + cert generation

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker/ca-entrypoint.sh

@@ -1,58 +1,123 @@
 #!/bin/bash
+# Initialize step-ca and request certificates from it.
+#
+# Certificates created by this service are meant to be used in
+# aurweb Docker's nginx service.
+#
+# If ./data/root_ca.crt is present, CA generation is skipped.
+# If ./data/${host}.{cert,key}.pem is available, host certificate
+# generation is skipped.
+#
 set -eou pipefail
 
-if [ -f /data/ca.root.pem ]; then
-    echo "Already have certs, skipping."
-    exit 0
+# /data-based variables.
+DATA_DIR="/data"
+DATA_ROOT_CA="$DATA_DIR/root_ca.crt"
+DATA_CERT="$DATA_DIR/localhost.cert.pem"
+DATA_CERT_KEY="$DATA_DIR/localhost.key.pem"
+
+# Host certificates requested from the CA (separated by spaces).
+DATA_CERT_HOSTS='localhost'
+
+# Local step paths and CA configuration values.
+STEP_DIR="$(step-cli path)"
+STEP_CA_CONFIG="$STEP_DIR/config/ca.json"
+STEP_CA_ADDR='127.0.0.1:8443'
+STEP_CA_URL='https://localhost:8443'
+STEP_CA_PROVISIONER='admin@localhost'
+
+# Password file used for both --password-file and --provisioner-password-file.
+STEP_PASSWD_FILE="$STEP_DIR/password.txt"
+
+# Hostnames supported by the CA.
+STEP_CA_NAME='aurweb'
+STEP_CA_DNS='localhost'
+
+make_password() {
+    # Create a random 20-length password and write it to $1.
+    openssl rand -hex 20 > $1
+}
+
+setup_step_ca() {
+    # Cleanup and setup step ca configuration.
+    rm -rf $STEP_DIR/*
+
+    # Initialize `step`
+    make_password "$STEP_PASSWD_FILE"
+    step-cli ca init \
+        --name="$STEP_CA_NAME" \
+        --dns="$STEP_CA_DNS" \
+        --address="$STEP_CA_ADDR" \
+        --password-file="$STEP_PASSWD_FILE" \
+        --provisioner="$STEP_CA_PROVISIONER" \
+        --provisioner-password-file="$STEP_PASSWD_FILE" \
+        --with-ca-url="$STEP_CA_URL"
+
+    # Update ca.json max TLS certificate duration to a year.
+    update-step-config "$STEP_CA_CONFIG"
+
+    # Install root_ca.crt as read/writable to /data/root_ca.crt.
+    install -m666 "$STEP_DIR/certs/root_ca.crt" "$DATA_ROOT_CA"
+}
+
+start_step_ca() {
+    # Start the step-ca web server.
+    step-ca "$STEP_CA_CONFIG" \
+        --password-file="$STEP_PASSWD_FILE" &
+    until printf "" 2>>/dev/null >>/dev/tcp/127.0.0.1/8443; do
+       sleep 1
+    done
+}
+
+kill_step_ca() {
+    # Stop the step-ca web server.
+    killall step-ca >/dev/null 2>&1 || /bin/true
+}
+
+install_step_ca() {
+    # Install step-ca certificate authority to the system.
+    step-cli certificate install "$STEP_DIR/certs/root_ca.crt"
+}
+
+step_cert_request() {
+    # Request a certificate from the step ca.
+    step-cli ca certificate \
+        --not-after=8800h \
+        --provisioner="$STEP_CA_PROVISIONER" \
+        --provisioner-password-file="$STEP_PASSWD_FILE" \
+        $1 $2 $3
+    chmod 666 /data/${1}.*.pem
+}
+
+if [ ! -f $DATA_ROOT_CA ]; then
+    setup_step_ca
+    install_step_ca
 fi
 
-# Generate a new 2048-bit RSA key for the Root CA.
-openssl genrsa -des3 -out /data/ca.key -passout pass:devca 2048
+# For all hosts separated by spaces in $DATA_CERT_HOSTS, perform a check
+# for their existence in /data and react accordingly.
+for host in $DATA_CERT_HOSTS; do
+    if [ -f /data/${host}.cert.pem ] && [ -f /data/${host}.key.pem ]; then
+        # Found an override. Move on to running the service after
+        # printing a notification to the user.
+        echo "Found '${host}.{cert,key}.pem' override, skipping..."
+        echo -n "Note: If you need to regenerate certificates, run "
+        echo '`rm -f data/*.{cert,key}.pem` before starting this service.'
+        exec "$@"
+    else
+        # Otherwise, we had a missing cert or key, so remove both.
+        rm -f /data/${host}.cert.pem
+        rm -f /data/${host}.key.pem
+    fi
+done
 
-# Request and self-sign a new Root CA certificate, using
-# the RSA key. Output Root CA PEM-format certificate and key:
-# /data/ca.root.pem and /data/ca.key.pem
-openssl req -x509 -new -nodes -sha256 -days 1825 \
-    -passin pass:devca \
-    -subj "/C=US/ST=California/L=Authority/O=aurweb/CN=localhost" \
-    -in /data/ca.key -out /data/ca.root.pem -keyout /data/ca.key.pem
+start_step_ca
+for host in $DATA_CERT_HOSTS; do
+    step_cert_request $host /data/${host}.cert.pem /data/${host}.key.pem
+done
+kill_step_ca
 
-# Generate a new 2048-bit RSA key for a localhost server.
-openssl genrsa -out /data/localhost.key 2048
-
-# Generate a Certificate Signing Request (CSR) for the localhost server
-# using the RSA key we generated above.
-openssl req -new -key /data/localhost.key -passout pass:devca \
-    -subj "/C=US/ST=California/L=Server/O=aurweb/CN=localhost" \
-    -out /data/localhost.csr
-
-# Get our CSR signed by our Root CA PEM-formatted certificate and key
-# to produce a fresh /data/localhost.cert.pem PEM-formatted certificate.
-openssl x509 -req -in /data/localhost.csr \
-    -CA /data/ca.root.pem -CAkey /data/ca.key.pem \
-    -CAcreateserial \
-    -out /data/localhost.cert.pem \
-    -days 825 -sha256 \
-    -passin pass:devca \
-    -extfile /docker/localhost.ext
-
-# Convert RSA key to a PEM-formatted key: /data/localhost.key.pem
-openssl rsa -in /data/localhost.key -text > /data/localhost.key.pem
-
-# At the end here, our notable certificates and keys are:
-#   - /data/ca.root.pem
-#   - /data/ca.key.pem
-#   - /data/localhost.key.pem
-#   - /data/localhost.cert.pem
-#
-# When running a server which uses the localhost certificate, a chain
-# should be used, starting with localhost.cert.pem:
-#   - cat /data/localhost.cert.pem /data/ca.root.pem > localhost.chain.pem
-#
-# The Root CA (ca.root.pem) should be imported into browsers or
-# ca-certificates on machines wishing to verify localhost.
-#
-
-chmod 666 /data/*
+# Set permissions to /data to rwx for everybody.
+chmod 777 /data
 
 exec "$@"

docker/health/ca.sh

@@ -0,0 +1,2 @@
+
+exec printf "" 2>>/dev/null >>/dev/tcp/127.0.0.1/8443

docker/nginx-entrypoint.sh

@@ -15,7 +15,7 @@ if [ -f "$CERT" ]; then
     cp -vf "$CERT" "$DEST_CERT"
     cp -vf "$KEY" "$DEST_KEY"
 else
-    cat /data/localhost.cert.pem /data/ca.root.pem > "$DEST_CERT"
+    cat /data/localhost.cert.pem /data/root_ca.crt > "$DEST_CERT"
     cp -vf /data/localhost.key.pem "$DEST_KEY"
 fi
 

docker/scripts/install-deps.sh

@@ -9,6 +9,6 @@ pacman -Syu --noconfirm --noprogressbar \
       mariadb mariadb-libs cgit-aurweb uwsgi uwsgi-plugin-cgi \
       php php-fpm memcached php-memcached python-pip pyalpm \
       python-srcinfo curl libeatmydata cronie python-poetry \
-      python-poetry-core
+      python-poetry-core step-cli step-ca
 
 exec "$@"

docker/scripts/run-ca.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+STEP_DIR="$(step-cli path)"
+STEP_PASSWD_FILE="$STEP_DIR/password.txt"
+STEP_CA_CONFIG="$STEP_DIR/config/ca.json"
+
+# Start the step-ca https server.
+exec step-ca "$STEP_CA_CONFIG" --password-file="$STEP_PASSWD_FILE"

docker/scripts/update-step-config

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+import json
+import sys
+
+CA_CONFIG = sys.argv[1]
+
+with open(CA_CONFIG) as f:
+    data = json.load(f)
+
+if "authority" not in data:
+    data["authority"] = dict()
+if "claims" not in data["authority"]:
+    data["authority"]["claims"] = dict()
+
+# One year of certificate duration.
+data["authority"]["claims"] = {"maxTLSCertDuration": "8800h"}
+
+with open(CA_CONFIG, "w") as f:
+    json.dump(data, f)