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main_test.go
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651 lines (510 loc) · 15.6 KB
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package main
import (
"crypto/ed25519"
"crypto/rand"
"encoding/hex"
"net"
"os"
"path/filepath"
"testing"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
// testBackend holds a test agent backend with its socket path
type testBackend struct {
agent agent.Agent
listener net.Listener
sockPath string
tmpDir string // directory to clean up (only if we created it)
}
// createShortTempDir creates a temporary directory with a short path in /tmp
// to avoid Unix socket path length limits (108 chars on Linux).
// t.TempDir() paths can be too long in nested nix shells.
func createShortTempDir(t *testing.T) string {
t.Helper()
randBytes := make([]byte, 6)
if _, err := rand.Read(randBytes); err != nil {
t.Fatalf("failed to generate random bytes: %v", err)
}
dir := filepath.Join("/tmp", "ua-"+hex.EncodeToString(randBytes))
if err := os.MkdirAll(dir, 0700); err != nil {
t.Fatalf("failed to create temp dir: %v", err)
}
return dir
}
// newTestBackend creates a new in-memory agent backend served over a Unix socket
func newTestBackend(t *testing.T, tmpDir string, name string) *testBackend {
t.Helper()
// Use short socket names to stay under Unix socket path limit
sockPath := filepath.Join(tmpDir, name+".s")
keyring := agent.NewKeyring()
listener, err := net.Listen("unix", sockPath)
if err != nil {
t.Fatalf("failed to create listener for %s: %v", name, err)
}
// Serve agent in background
go func() {
for {
conn, err := listener.Accept()
if err != nil {
return // listener closed
}
go agent.ServeAgent(keyring, conn)
}
}()
return &testBackend{
agent: keyring,
listener: listener,
sockPath: sockPath,
}
}
func (tb *testBackend) close() {
tb.listener.Close()
}
// testEnv manages a test environment with short temp directory
type testEnv struct {
dir string
t *testing.T
}
func newTestEnv(t *testing.T) *testEnv {
t.Helper()
return &testEnv{
dir: createShortTempDir(t),
t: t,
}
}
func (e *testEnv) cleanup() {
os.RemoveAll(e.dir)
}
// generateTestKey creates a new ed25519 key pair for testing
func generateTestKey(t *testing.T) (ed25519.PrivateKey, ssh.PublicKey) {
t.Helper()
pub, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("failed to generate test key: %v", err)
}
sshPub, err := ssh.NewPublicKey(pub)
if err != nil {
t.Fatalf("failed to convert public key: %v", err)
}
return priv, sshPub
}
// addKeyToBackend adds a key to a backend agent
func addKeyToBackend(t *testing.T, backend *testBackend, priv ed25519.PrivateKey, comment string) {
t.Helper()
err := backend.agent.Add(agent.AddedKey{
PrivateKey: priv,
Comment: comment,
})
if err != nil {
t.Fatalf("failed to add key to backend: %v", err)
}
}
func TestList_SingleBackend(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
addKeyToBackend(t, backend, priv1, "key1")
addKeyToBackend(t, backend, priv2, "key2")
union := NewUnionAgent([]string{backend.sockPath})
keys, err := union.List()
if err != nil {
t.Fatalf("List() error: %v", err)
}
if len(keys) != 2 {
t.Errorf("expected 2 keys, got %d", len(keys))
}
}
func TestList_MultipleBackends(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
priv3, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv1, "key1-backend1")
addKeyToBackend(t, backend1, priv2, "key2-backend1")
addKeyToBackend(t, backend2, priv3, "key3-backend2")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
keys, err := union.List()
if err != nil {
t.Fatalf("List() error: %v", err)
}
if len(keys) != 3 {
t.Errorf("expected 3 keys, got %d", len(keys))
}
}
func TestList_Deduplication(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
// Add the same key to both backends
priv, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv, "shared-key-backend1")
addKeyToBackend(t, backend2, priv, "shared-key-backend2")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
keys, err := union.List()
if err != nil {
t.Fatalf("List() error: %v", err)
}
if len(keys) != 1 {
t.Errorf("expected 1 key (deduplicated), got %d", len(keys))
}
}
func TestList_UnavailableBackend(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv, _ := generateTestKey(t)
addKeyToBackend(t, backend, priv, "key1")
// Include a non-existent socket path
nonExistent := filepath.Join(env.dir, "bad.s")
union := NewUnionAgent([]string{nonExistent, backend.sockPath})
keys, err := union.List()
if err != nil {
t.Fatalf("List() error: %v", err)
}
// Should still return keys from the available backend
if len(keys) != 1 {
t.Errorf("expected 1 key from available backend, got %d", len(keys))
}
}
func TestSign_SingleBackend(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv, pub := generateTestKey(t)
addKeyToBackend(t, backend, priv, "key1")
union := NewUnionAgent([]string{backend.sockPath})
data := []byte("test data to sign")
sig, err := union.Sign(pub, data)
if err != nil {
t.Fatalf("Sign() error: %v", err)
}
// Verify signature
if err := pub.Verify(data, sig); err != nil {
t.Errorf("signature verification failed: %v", err)
}
}
func TestSign_MultipleBackends_KeyInFirst(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv, pub := generateTestKey(t)
addKeyToBackend(t, backend1, priv, "key1")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
data := []byte("test data to sign")
sig, err := union.Sign(pub, data)
if err != nil {
t.Fatalf("Sign() error: %v", err)
}
if err := pub.Verify(data, sig); err != nil {
t.Errorf("signature verification failed: %v", err)
}
}
func TestSign_MultipleBackends_KeyInSecond(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv, pub := generateTestKey(t)
addKeyToBackend(t, backend2, priv, "key1") // Key only in second backend
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
data := []byte("test data to sign")
sig, err := union.Sign(pub, data)
if err != nil {
t.Fatalf("Sign() error: %v", err)
}
if err := pub.Verify(data, sig); err != nil {
t.Errorf("signature verification failed: %v", err)
}
}
func TestSign_KeyNotFound(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
// Generate a key but don't add it to the backend
_, pub := generateTestKey(t)
union := NewUnionAgent([]string{backend.sockPath})
data := []byte("test data to sign")
_, err := union.Sign(pub, data)
if err == nil {
t.Error("expected error when signing with unknown key, got nil")
}
}
func TestSignWithFlags(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv, pub := generateTestKey(t)
addKeyToBackend(t, backend, priv, "key1")
union := NewUnionAgent([]string{backend.sockPath})
data := []byte("test data to sign")
sig, err := union.SignWithFlags(pub, data, 0)
if err != nil {
t.Fatalf("SignWithFlags() error: %v", err)
}
if err := pub.Verify(data, sig); err != nil {
t.Errorf("signature verification failed: %v", err)
}
}
func TestAdd_ForwardsToFirstBackend(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
priv, _ := generateTestKey(t)
err := union.Add(agent.AddedKey{
PrivateKey: priv,
Comment: "added-via-union",
})
if err != nil {
t.Fatalf("Add() error: %v", err)
}
// Key should be in first backend
keys1, _ := backend1.agent.List()
if len(keys1) != 1 {
t.Errorf("expected 1 key in first backend, got %d", len(keys1))
}
// Key should NOT be in second backend
keys2, _ := backend2.agent.List()
if len(keys2) != 0 {
t.Errorf("expected 0 keys in second backend, got %d", len(keys2))
}
}
func TestAdd_NoBackends(t *testing.T) {
union := NewUnionAgent([]string{})
priv, _ := generateTestKey(t)
err := union.Add(agent.AddedKey{
PrivateKey: priv,
Comment: "test",
})
if err == nil {
t.Error("expected error when adding to union with no backends, got nil")
}
}
func TestRemove_FromAllBackends(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
// Add the same key to both backends
priv, pub := generateTestKey(t)
addKeyToBackend(t, backend1, priv, "shared-key")
addKeyToBackend(t, backend2, priv, "shared-key")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
err := union.Remove(pub)
if err != nil {
t.Fatalf("Remove() error: %v", err)
}
// Key should be removed from both backends
keys1, _ := backend1.agent.List()
if len(keys1) != 0 {
t.Errorf("expected 0 keys in first backend after remove, got %d", len(keys1))
}
keys2, _ := backend2.agent.List()
if len(keys2) != 0 {
t.Errorf("expected 0 keys in second backend after remove, got %d", len(keys2))
}
}
func TestRemoveAll_FromAllBackends(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
priv3, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv1, "key1")
addKeyToBackend(t, backend1, priv2, "key2")
addKeyToBackend(t, backend2, priv3, "key3")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
err := union.RemoveAll()
if err != nil {
t.Fatalf("RemoveAll() error: %v", err)
}
// All keys should be removed from both backends
keys1, _ := backend1.agent.List()
if len(keys1) != 0 {
t.Errorf("expected 0 keys in first backend after RemoveAll, got %d", len(keys1))
}
keys2, _ := backend2.agent.List()
if len(keys2) != 0 {
t.Errorf("expected 0 keys in second backend after RemoveAll, got %d", len(keys2))
}
}
func TestLock_AllBackends(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv1, "key1")
addKeyToBackend(t, backend2, priv2, "key2")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
passphrase := []byte("test-passphrase")
err := union.Lock(passphrase)
if err != nil {
t.Fatalf("Lock() error: %v", err)
}
// Both backends should be locked (return 0 keys when locked)
keys1, _ := backend1.agent.List()
if len(keys1) != 0 {
t.Errorf("expected 0 keys from locked first backend, got %d", len(keys1))
}
keys2, _ := backend2.agent.List()
if len(keys2) != 0 {
t.Errorf("expected 0 keys from locked second backend, got %d", len(keys2))
}
}
func TestUnlock_AllBackends(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv1, "key1")
addKeyToBackend(t, backend2, priv2, "key2")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
passphrase := []byte("test-passphrase")
// Lock first
err := union.Lock(passphrase)
if err != nil {
t.Fatalf("Lock() error: %v", err)
}
// Then unlock
err = union.Unlock(passphrase)
if err != nil {
t.Fatalf("Unlock() error: %v", err)
}
// Both backends should be unlocked and show their keys
keys1, _ := backend1.agent.List()
if len(keys1) != 1 {
t.Errorf("expected 1 key from unlocked first backend, got %d", len(keys1))
}
keys2, _ := backend2.agent.List()
if len(keys2) != 1 {
t.Errorf("expected 1 key from unlocked second backend, got %d", len(keys2))
}
}
func TestUnlock_WrongPassphrase(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv, _ := generateTestKey(t)
addKeyToBackend(t, backend, priv, "key1")
union := NewUnionAgent([]string{backend.sockPath})
// Lock with one passphrase
err := union.Lock([]byte("correct-passphrase"))
if err != nil {
t.Fatalf("Lock() error: %v", err)
}
// Try to unlock with wrong passphrase
err = union.Unlock([]byte("wrong-passphrase"))
if err == nil {
t.Error("expected error when unlocking with wrong passphrase, got nil")
}
// Backend should still be locked
keys, _ := backend.agent.List()
if len(keys) != 0 {
t.Errorf("expected 0 keys from still-locked backend, got %d", len(keys))
}
}
func TestSigners_SingleBackend(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend := newTestBackend(t, env.dir, "a1")
defer backend.close()
priv1, _ := generateTestKey(t)
priv2, _ := generateTestKey(t)
addKeyToBackend(t, backend, priv1, "key1")
addKeyToBackend(t, backend, priv2, "key2")
union := NewUnionAgent([]string{backend.sockPath})
signers, err := union.Signers()
if err != nil {
t.Fatalf("Signers() error: %v", err)
}
if len(signers) != 2 {
t.Errorf("expected 2 signers, got %d", len(signers))
}
}
func TestSigners_MultipleBackends_Deduplication(t *testing.T) {
env := newTestEnv(t)
defer env.cleanup()
backend1 := newTestBackend(t, env.dir, "a1")
defer backend1.close()
backend2 := newTestBackend(t, env.dir, "a2")
defer backend2.close()
// Add the same key to both backends
priv, _ := generateTestKey(t)
addKeyToBackend(t, backend1, priv, "shared-key")
addKeyToBackend(t, backend2, priv, "shared-key")
union := NewUnionAgent([]string{backend1.sockPath, backend2.sockPath})
signers, err := union.Signers()
if err != nil {
t.Fatalf("Signers() error: %v", err)
}
if len(signers) != 1 {
t.Errorf("expected 1 signer (deduplicated), got %d", len(signers))
}
}
func TestGenerateSocketPath(t *testing.T) {
// Save and restore TMPDIR
origTmpdir := os.Getenv("TMPDIR")
defer os.Setenv("TMPDIR", origTmpdir)
tmpDir := t.TempDir()
os.Setenv("TMPDIR", tmpDir)
path, err := generateSocketPath()
if err != nil {
t.Fatalf("generateSocketPath() error: %v", err)
}
// Check that the directory was created
dir := filepath.Dir(path)
info, err := os.Stat(dir)
if err != nil {
t.Fatalf("socket directory not created: %v", err)
}
if !info.IsDir() {
t.Error("expected socket path parent to be a directory")
}
// Check permissions (should be 0700)
if info.Mode().Perm() != 0700 {
t.Errorf("expected directory permissions 0700, got %o", info.Mode().Perm())
}
// Check path format
if filepath.Base(dir)[:4] != "ssh-" {
t.Errorf("expected directory name to start with 'ssh-', got %s", filepath.Base(dir))
}
}