Make TLS setup work automatically

This commit injects the per-test-generated tls certs into the tailscale
container and makes sure all can ping all. It does not test any of the
DERP isolation yet.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/hsic/hsic.go

@@ -1,52 +1,83 @@
 package hsic
 
 import (
-	"archive/tar"
 	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
 	"encoding/json"
+	"encoding/pem"
 	"errors"
 	"fmt"
-	"io"
 	"log"
+	"math/big"
+	"net"
 	"net/http"
-	"path/filepath"
+	"time"
 
 	"github.com/juanfont/headscale"
 	v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
 	"github.com/juanfont/headscale/integration/dockertestutil"
+	"github.com/juanfont/headscale/integration/integrationutil"
 	"github.com/ory/dockertest/v3"
-	"github.com/ory/dockertest/v3/docker"
 )
 
 const (
 	hsicHashLength       = 6
 	dockerContextPath    = "../."
 	aclPolicyPath        = "/etc/headscale/acl.hujson"
+	tlsCertPath          = "/etc/headscale/tls.cert"
+	tlsKeyPath           = "/etc/headscale/tls.key"
+	headscaleDefaultPort = 8080
 )
 
 var errHeadscaleStatusCodeNotOk = errors.New("headscale status code not ok")
 
 type HeadscaleInContainer struct {
 	hostname string
-	port     int
 
 	pool      *dockertest.Pool
 	container *dockertest.Resource
 	network   *dockertest.Network
 
 	// optional config
+	port      int
 	aclPolicy *headscale.ACLPolicy
 	env       []string
+	tlsCert   []byte
+	tlsKey    []byte
 }
 
 type Option = func(c *HeadscaleInContainer)
 
 func WithACLPolicy(acl *headscale.ACLPolicy) Option {
 	return func(hsic *HeadscaleInContainer) {
+		// TODO(kradalby): Move somewhere appropriate
+		hsic.env = append(hsic.env, fmt.Sprintf("HEADSCALE_ACL_POLICY_PATH=%s", aclPolicyPath))
+
 		hsic.aclPolicy = acl
 	}
 }
 
+func WithTLS() Option {
+	return func(hsic *HeadscaleInContainer) {
+		cert, key, err := createCertificate()
+		if err != nil {
+			log.Fatalf("failed to create certificates for headscale test: %s", err)
+		}
+
+		// TODO(kradalby): Move somewhere appropriate
+		hsic.env = append(hsic.env, fmt.Sprintf("HEADSCALE_TLS_CERT_PATH=%s", tlsCertPath))
+		hsic.env = append(hsic.env, fmt.Sprintf("HEADSCALE_TLS_KEY_PATH=%s", tlsKeyPath))
+		hsic.env = append(hsic.env, "HEADSCALE_TLS_CLIENT_AUTH_MODE=disabled")
+
+		hsic.tlsCert = cert
+		hsic.tlsKey = key
+	}
+}
+
 func WithConfigEnv(configEnv map[string]string) Option {
 	return func(hsic *HeadscaleInContainer) {
 		env := []string{}
@@ -59,9 +90,14 @@ func WithConfigEnv(configEnv map[string]string) Option {
 	}
 }
 
+func WithPort(port int) Option {
+	return func(hsic *HeadscaleInContainer) {
+		hsic.port = port
+	}
+}
+
 func New(
 	pool *dockertest.Pool,
-	port int,
 	network *dockertest.Network,
 	opts ...Option,
 ) (*HeadscaleInContainer, error) {
@@ -71,11 +107,10 @@ func New(
 	}
 
 	hostname := fmt.Sprintf("hs-%s", hash)
-	portProto := fmt.Sprintf("%d/tcp", port)
 
 	hsic := &HeadscaleInContainer{
 		hostname: hostname,
-		port:     port,
+		port:     headscaleDefaultPort,
 
 		pool:    pool,
 		network: network,
@@ -85,9 +120,7 @@ func New(
 		opt(hsic)
 	}
 
-	if hsic.aclPolicy != nil {
-		hsic.env = append(hsic.env, fmt.Sprintf("HEADSCALE_ACL_POLICY_PATH=%s", aclPolicyPath))
-	}
+	portProto := fmt.Sprintf("%d/tcp", hsic.port)
 
 	headscaleBuildOptions := &dockertest.BuildOptions{
 		Dockerfile: "Dockerfile.debug",
@@ -144,9 +177,25 @@ func New(
 		}
 	}
 
+	if hsic.hasTLS() {
+		err = hsic.WriteFile(tlsCertPath, hsic.tlsCert)
+		if err != nil {
+			return nil, fmt.Errorf("failed to write TLS certificate to container: %w", err)
+		}
+
+		err = hsic.WriteFile(tlsKeyPath, hsic.tlsKey)
+		if err != nil {
+			return nil, fmt.Errorf("failed to write TLS key to container: %w", err)
+		}
+	}
+
 	return hsic, nil
 }
 
+func (t *HeadscaleInContainer) hasTLS() bool {
+	return len(t.tlsCert) != 0 && len(t.tlsKey) != 0
+}
+
 func (t *HeadscaleInContainer) Shutdown() error {
 	return t.pool.Purge(t.container)
 }
@@ -183,11 +232,7 @@ func (t *HeadscaleInContainer) GetPort() string {
 }
 
 func (t *HeadscaleInContainer) GetHealthEndpoint() string {
-	hostEndpoint := fmt.Sprintf("%s:%d",
-		t.GetIP(),
-		t.port)
-
-	return fmt.Sprintf("http://%s/health", hostEndpoint)
+	return fmt.Sprintf("%s/health", t.GetEndpoint())
 }
 
 func (t *HeadscaleInContainer) GetEndpoint() string {
@@ -195,17 +240,39 @@ func (t *HeadscaleInContainer) GetEndpoint() string {
 		t.GetIP(),
 		t.port)
 
+	if t.hasTLS() {
+		return fmt.Sprintf("https://%s", hostEndpoint)
+	}
+
 	return fmt.Sprintf("http://%s", hostEndpoint)
 }
 
+func (t *HeadscaleInContainer) GetCert() []byte {
+	return t.tlsCert
+}
+
+func (t *HeadscaleInContainer) GetHostname() string {
+	return t.hostname
+}
+
 func (t *HeadscaleInContainer) WaitForReady() error {
 	url := t.GetHealthEndpoint()
 
 	log.Printf("waiting for headscale to be ready at %s", url)
 
+	client := &http.Client{}
+
+	if t.hasTLS() {
+		insecureTransport := http.DefaultTransport.(*http.Transport).Clone()
+		insecureTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
+		client = &http.Client{Transport: insecureTransport}
+	}
+
 	return t.pool.Retry(func() error {
-		resp, err := http.Get(url) //nolint
+		resp, err := client.Get(url) //nolint
 		if err != nil {
+			log.Printf("ready err: %s", err)
+
 			return fmt.Errorf("headscale is not ready: %w", err)
 		}
 
@@ -292,55 +359,96 @@ func (t *HeadscaleInContainer) ListMachinesInNamespace(
 }
 
 func (t *HeadscaleInContainer) WriteFile(path string, data []byte) error {
-	dirPath, fileName := filepath.Split(path)
+	return integrationutil.WriteFileToContainer(t.pool, t.container, path, data)
+}
 
-	file := bytes.NewReader(data)
+func createCertificate() ([]byte, []byte, error) {
+	// From:
+	// https://shaneutt.com/blog/golang-ca-and-signed-cert-go/
 
-	buf := bytes.NewBuffer([]byte{})
-
-	tarWriter := tar.NewWriter(buf)
-
-	header := &tar.Header{
-		Name: fileName,
-		Size: file.Size(),
-		// Mode:    int64(stat.Mode()),
-		// ModTime: stat.ModTime(),
-	}
-
-	err := tarWriter.WriteHeader(header)
-	if err != nil {
-		return fmt.Errorf("failed write file header to tar: %w", err)
-	}
-
-	_, err = io.Copy(tarWriter, file)
-	if err != nil {
-		return fmt.Errorf("failed to copy file to tar: %w", err)
-	}
-
-	err = tarWriter.Close()
-	if err != nil {
-		return fmt.Errorf("failed to close tar: %w", err)
-	}
-
-	log.Printf("tar: %s", buf.String())
-
-	// Ensure the directory is present inside the container
-	_, err = t.Execute([]string{"mkdir", "-p", dirPath})
-	if err != nil {
-		return fmt.Errorf("failed to ensure directory: %w", err)
-	}
-
-	err = t.pool.Client.UploadToContainer(
-		t.container.Container.ID,
-		docker.UploadToContainerOptions{
-			NoOverwriteDirNonDir: false,
-			Path:                 dirPath,
-			InputStream:          bytes.NewReader(buf.Bytes()),
+	ca := &x509.Certificate{
+		SerialNumber: big.NewInt(2019),
+		Subject: pkix.Name{
+			Organization: []string{"Headscale testing INC"},
+			Country:      []string{"NL"},
+			Locality:     []string{"Leiden"},
 		},
+		NotBefore: time.Now(),
+		NotAfter:  time.Now().Add(30 * time.Minute),
+		IsCA:      true,
+		ExtKeyUsage: []x509.ExtKeyUsage{
+			x509.ExtKeyUsageClientAuth,
+			x509.ExtKeyUsageServerAuth,
+		},
+		KeyUsage:              x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
+		BasicConstraintsValid: true,
+	}
+
+	caPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// caBytes, err := x509.CreateCertificate(rand.Reader, ca, ca, &caPrivKey.PublicKey, caPrivKey)
+	// if err != nil {
+	// 	return nil, err
+	// }
+
+	cert := &x509.Certificate{
+		SerialNumber: big.NewInt(1658),
+		Subject: pkix.Name{
+			Organization: []string{"Headscale testing INC"},
+			Country:      []string{"NL"},
+			Locality:     []string{"Leiden"},
+		},
+		IPAddresses:  []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
+		NotBefore:    time.Now(),
+		NotAfter:     time.Now().Add(30 * time.Minute),
+		SubjectKeyId: []byte{1, 2, 3, 4, 6},
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
+		KeyUsage:     x509.KeyUsageDigitalSignature,
+	}
+
+	certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	certBytes, err := x509.CreateCertificate(
+		rand.Reader,
+		cert,
+		ca,
+		&certPrivKey.PublicKey,
+		caPrivKey,
 	)
 	if err != nil {
-		return err
+		return nil, nil, err
 	}
 
-	return nil
+	certPEM := new(bytes.Buffer)
+
+	err = pem.Encode(certPEM, &pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: certBytes,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	certPrivKeyPEM := new(bytes.Buffer)
+
+	err = pem.Encode(certPrivKeyPEM, &pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// serverCert, err := tls.X509KeyPair(certPEM.Bytes(), certPrivKeyPEM.Bytes())
+	// if err != nil {
+	// 	return nil, err
+	// }
+
+	return certPEM.Bytes(), certPrivKeyPEM.Bytes(), nil
 }

integration/integrationutil/util.go

@@ -0,0 +1,77 @@
+package integrationutil
+
+import (
+	"archive/tar"
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"path/filepath"
+
+	"github.com/juanfont/headscale/integration/dockertestutil"
+	"github.com/ory/dockertest/v3"
+	"github.com/ory/dockertest/v3/docker"
+)
+
+func WriteFileToContainer(
+	pool *dockertest.Pool,
+	container *dockertest.Resource,
+	path string,
+	data []byte,
+) error {
+	dirPath, fileName := filepath.Split(path)
+
+	file := bytes.NewReader(data)
+
+	buf := bytes.NewBuffer([]byte{})
+
+	tarWriter := tar.NewWriter(buf)
+
+	header := &tar.Header{
+		Name: fileName,
+		Size: file.Size(),
+		// Mode:    int64(stat.Mode()),
+		// ModTime: stat.ModTime(),
+	}
+
+	err := tarWriter.WriteHeader(header)
+	if err != nil {
+		return fmt.Errorf("failed write file header to tar: %w", err)
+	}
+
+	_, err = io.Copy(tarWriter, file)
+	if err != nil {
+		return fmt.Errorf("failed to copy file to tar: %w", err)
+	}
+
+	err = tarWriter.Close()
+	if err != nil {
+		return fmt.Errorf("failed to close tar: %w", err)
+	}
+
+	log.Printf("tar: %s", buf.String())
+
+	// Ensure the directory is present inside the container
+	_, _, err = dockertestutil.ExecuteCommand(
+		container,
+		[]string{"mkdir", "-p", dirPath},
+		[]string{},
+	)
+	if err != nil {
+		return fmt.Errorf("failed to ensure directory: %w", err)
+	}
+
+	err = pool.Client.UploadToContainer(
+		container.Container.ID,
+		docker.UploadToContainerOptions{
+			NoOverwriteDirNonDir: false,
+			Path:                 dirPath,
+			InputStream:          bytes.NewReader(buf.Bytes()),
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

integration/scenario.go

@@ -150,20 +150,8 @@ func (s *Scenario) Namespaces() []string {
 // Note: These functions assume that there is a _single_ headscale instance for now
 
 // TODO(kradalby): make port and headscale configurable, multiple instances support?
-func (s *Scenario) StartHeadscale() error {
-	headscale, err := hsic.New(s.pool, headscalePort, s.network,
-		hsic.WithACLPolicy(
-			&headscale.ACLPolicy{
-				ACLs: []headscale.ACL{
-					{
-						Action:       "accept",
-						Sources:      []string{"*"},
-						Destinations: []string{"*:*"},
-					},
-				},
-			},
-		),
-	)
+func (s *Scenario) StartHeadscale(opts ...hsic.Option) error {
+	headscale, err := hsic.New(s.pool, s.network, opts...)
 	if err != nil {
 		return fmt.Errorf("failed to create headscale container: %w", err)
 	}
@@ -228,10 +216,22 @@ func (s *Scenario) CreateTailscaleNodesInNamespace(
 				defer namespace.createWaitGroup.Done()
 
 				// TODO(kradalby): error handle this
-				tsClient, err := tsic.New(s.pool, version, s.network)
+				tsClient, err := tsic.New(
+					s.pool,
+					version,
+					s.network,
+					tsic.WithHeadscaleTLS(s.Headscale().GetCert()),
+					tsic.WithHeadscaleName(s.Headscale().GetHostname()),
+				)
 				if err != nil {
 					// return fmt.Errorf("failed to add tailscale node: %w", err)
-					log.Printf("failed to add tailscale node: %s", err)
+					log.Printf("failed to create tailscale node: %s", err)
+				}
+
+				err = tsClient.WaitForReady()
+				if err != nil {
+					// return fmt.Errorf("failed to add tailscale node: %w", err)
+					log.Printf("failed to wait for tailscaled: %s", err)
 				}
 
 				namespace.Clients[tsClient.Hostname()] = tsClient
@@ -306,8 +306,8 @@ func (s *Scenario) WaitForTailscaleSync() error {
 // CreateHeadscaleEnv is a conventient method returning a set up Headcale
 // test environment with nodes of all versions, joined to the server with X
 // namespaces.
-func (s *Scenario) CreateHeadscaleEnv(namespaces map[string]int) error {
-	err := s.StartHeadscale()
+func (s *Scenario) CreateHeadscaleEnv(namespaces map[string]int, opts ...hsic.Option) error {
+	err := s.StartHeadscale(opts...)
 	if err != nil {
 		return err
 	}

integration/tsic/tsic.go

@@ -12,6 +12,7 @@ import (
 	"github.com/cenkalti/backoff/v4"
 	"github.com/juanfont/headscale"
 	"github.com/juanfont/headscale/integration/dockertestutil"
+	"github.com/juanfont/headscale/integration/integrationutil"
 	"github.com/ory/dockertest/v3"
 	"github.com/ory/dockertest/v3/docker"
 	"tailscale.com/ipn/ipnstate"
@@ -20,6 +21,7 @@ import (
 const (
 	tsicHashLength    = 6
 	dockerContextPath = "../."
+	headscaleCertPath = "/usr/local/share/ca-certificates/headscale.crt"
 )
 
 var (
@@ -41,12 +43,51 @@ type TailscaleInContainer struct {
 	// "cache"
 	ips  []netip.Addr
 	fqdn string
+
+	// optional config
+	headscaleCert     []byte
+	headscaleHostname string
+}
+
+type Option = func(c *TailscaleInContainer)
+
+func WithHeadscaleTLS(cert []byte) Option {
+	return func(tsic *TailscaleInContainer) {
+		tsic.headscaleCert = cert
+	}
+}
+
+func WithOrCreateNetwork(network *dockertest.Network) Option {
+	return func(tsic *TailscaleInContainer) {
+		if network != nil {
+			tsic.network = network
+
+			return
+		}
+
+		network, err := dockertestutil.GetFirstOrCreateNetwork(
+			tsic.pool,
+			fmt.Sprintf("%s-network", tsic.hostname),
+		)
+		if err != nil {
+			log.Fatalf("failed to create network: %s", err)
+		}
+
+		tsic.network = network
+	}
+}
+
+func WithHeadscaleName(hsName string) Option {
+	return func(tsic *TailscaleInContainer) {
+		tsic.headscaleHostname = hsName
+	}
 }
 
 func New(
 	pool *dockertest.Pool,
 	version string,
 	network *dockertest.Network,
+	opts ...Option,
 ) (*TailscaleInContainer, error) {
 	hash, err := headscale.GenerateRandomStringDNSSafe(tsicHashLength)
 	if err != nil {
@@ -55,20 +96,38 @@ func New(
 
 	hostname := fmt.Sprintf("ts-%s-%s", strings.ReplaceAll(version, ".", "-"), hash)
 
-	// TODO(kradalby): figure out why we need to "refresh" the network here.
-	// network, err = dockertestutil.GetFirstOrCreateNetwork(pool, network.Network.Name)
-	// if err != nil {
-	// 	return nil, err
-	// }
+	tsic := &TailscaleInContainer{
+		version:  version,
+		hostname: hostname,
+
+		pool:    pool,
+		network: network,
+	}
+
+	for _, opt := range opts {
+		opt(tsic)
+	}
 
 	tailscaleOptions := &dockertest.RunOptions{
 		Name:     hostname,
 		Networks: []*dockertest.Network{network},
-		Cmd: []string{
-			"tailscaled", "--tun=tsdev",
+		// Cmd: []string{
+		// 	"tailscaled", "--tun=tsdev",
+		// },
+		Entrypoint: []string{
+			"/bin/bash",
+			"-c",
+			"/bin/sleep 3 ; update-ca-certificates ; tailscaled --tun=tsdev",
 		},
 	}
 
+	if tsic.headscaleHostname != "" {
+		tailscaleOptions.ExtraHosts = []string{
+			"host.docker.internal:host-gateway",
+			fmt.Sprintf("%s:host-gateway", tsic.headscaleHostname),
+		}
+	}
+
 	// dockertest isnt very good at handling containers that has already
 	// been created, this is an attempt to make sure this container isnt
 	// present.
@@ -89,14 +148,20 @@ func New(
 	}
 	log.Printf("Created %s container\n", hostname)
 
-	return &TailscaleInContainer{
-		version:  version,
-		hostname: hostname,
+	tsic.container = container
 
-		pool:      pool,
-		container: container,
-		network:   network,
-	}, nil
+	if tsic.hasTLS() {
+		err = tsic.WriteFile(headscaleCertPath, tsic.headscaleCert)
+		if err != nil {
+			return nil, fmt.Errorf("failed to write TLS certificate to container: %w", err)
+		}
+	}
+
+	return tsic, nil
+}
+
+func (t *TailscaleInContainer) hasTLS() bool {
+	return len(t.headscaleCert) != 0
 }
 
 func (t *TailscaleInContainer) Shutdown() error {
@@ -111,6 +176,19 @@ func (t *TailscaleInContainer) Version() string {
 	return t.version
 }
 
+func (t *TailscaleInContainer) WaitForReady() error {
+	return t.pool.Retry(func() error {
+		// If tailscaled has not started yet, this will return a non-zero
+		// status code
+		_, err := t.Execute([]string{"tailscale", "status"})
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
 func (t *TailscaleInContainer) Execute(
 	command []string,
 ) (string, string, error) {
@@ -318,6 +396,10 @@ func (t *TailscaleInContainer) Ping(hostnameOrIP string) error {
 	})
 }
 
+func (t *TailscaleInContainer) WriteFile(path string, data []byte) error {
+	return integrationutil.WriteFileToContainer(t.pool, t.container, path, data)
+}
+
 func createTailscaleBuildOptions(version string) *dockertest.BuildOptions {
 	var tailscaleBuildOptions *dockertest.BuildOptions
 	switch version {