Add client implementation of hello-mTLS using nodejs

Fixes smallstep/ca-component#138

autocert/examples/hello-mtls/README.md

@@ -68,9 +68,9 @@ languages are appreciated!
   - [X] Restrict to safe ciphersuites and TLS versions
   - [ ] TLS stack configuration loaded from `step-ca`
   - [ ] Root certificate rotation
-- [ ] Client using autocert root certificate
-  - [ ] mTLS (send client certificate if server asks for it)
-  - [ ] Automatic certificate rotation
-  - [ ] Restrict to safe ciphersuites and TLS versions
+- [X] Client using autocert root certificate
+  - [X] mTLS (send client certificate if server asks for it)
+  - [X] Automatic certificate rotation
+  - [X] Restrict to safe ciphersuites and TLS versions
   - [ ] TLS stack configuration loaded from `step-ca`
   - [ ] Root certificate rotation

autocert/examples/hello-mtls/node/Dockerfile.client

@@ -0,0 +1,6 @@
+FROM node:lts-alpine
+
+RUN mkdir /src
+ADD client.js /src
+
+CMD ["node", "/src/client.js"]

autocert/examples/hello-mtls/node/client.js

@@ -0,0 +1,44 @@
+const fs = require('fs'); 
+const https = require('https'); 
+
+const config = {
+    ca: '/var/run/autocert.step.sm/root.crt',
+    key: '/var/run/autocert.step.sm/site.key',
+    cert: '/var/run/autocert.step.sm/site.crt',
+    url: process.env.HELLO_MTLS_URL,
+    requestFrequency: 5000
+};
+
+var options = { 
+    ca: fs.readFileSync(config.ca), 
+    key: fs.readFileSync(config.key),
+    cert: fs.readFileSync(config.cert),
+    ciphers: 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256',
+    minVersion: 'TLSv1.2',
+    maxVersion: 'TLSv1.2',
+    // Not necessary as it defaults to true
+    rejectUnauthorized: true
+};
+
+fs.watch(config.cert, (event, filename) => {
+    if (event == 'change') {
+        options.cert = fs.readFileSync(config.cert);
+    }
+});
+
+function loop() {
+    var req = https.request(config.url, options, function(res) { 
+        res.on('data', (data) => {
+            process.stdout.write(options.cert)
+            process.stdout.write(data)
+            setTimeout(loop, config.requestFrequency);
+        }); 
+    }); 
+    req.on('error', (e) => {
+        process.stderr.write('error: ' + e.message + '\n');
+        setTimeout(loop, config.requestFrequency);
+    })
+    req.end();
+}
+
+loop();

autocert/examples/hello-mtls/node/hello-mtls.client.yaml

@@ -0,0 +1,22 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hello-mtls-client
+  labels: {app: hello-mtls-client}
+spec:
+  replicas: 1
+  selector: {matchLabels: {app: hello-mtls-client}}
+  template:
+    metadata:
+      annotations:
+        autocert.step.sm/name: hello-mtls-client.default.pod.cluster.local
+      labels: {app: hello-mtls-client}
+    spec:
+      containers:
+      - name: hello-mtls-client
+        image: hello-mtls-client-node:latest
+        imagePullPolicy: Never
+        resources: {requests: {cpu: 10m, memory: 20Mi}}
+        env:
+        - name: HELLO_MTLS_URL
+          value: https://hello-mtls.default.svc.cluster.local

autocert/examples/hello-mtls/node/server.js

@@ -9,7 +9,7 @@ var config = {
     ciphers: 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256',
     minVersion: 'TLSv1.2',
     maxVersion: 'TLSv1.2'
-}
+};
 
 function createSecureContext() {
     return tls.createSecureContext({
@@ -24,7 +24,7 @@ var ctx = createSecureContext()
 
 fs.watch(config.cert, (event, filename) => {
     if (event == 'change') {
-        ctx = createSecureContext()
+        ctx = createSecureContext();
     }
 });
 
@@ -38,3 +38,5 @@ https.createServer({
     res.writeHead(200);
     res.end('hello nodejs\n');
 }).listen(443);
+
+console.log("Listening on :443 ...");