Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/github.com/docker/libtrust/key_manager.go

@@ -0,0 +1,175 @@
+package libtrust
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os"
+	"path"
+	"sync"
+)
+
+// ClientKeyManager manages client keys on the filesystem
+type ClientKeyManager struct {
+	key        PrivateKey
+	clientFile string
+	clientDir  string
+
+	clientLock sync.RWMutex
+	clients    []PublicKey
+
+	configLock sync.Mutex
+	configs    []*tls.Config
+}
+
+// NewClientKeyManager loads a new manager from a set of key files
+// and managed by the given private key.
+func NewClientKeyManager(trustKey PrivateKey, clientFile, clientDir string) (*ClientKeyManager, error) {
+	m := &ClientKeyManager{
+		key:        trustKey,
+		clientFile: clientFile,
+		clientDir:  clientDir,
+	}
+	if err := m.loadKeys(); err != nil {
+		return nil, err
+	}
+	// TODO Start watching file and directory
+
+	return m, nil
+}
+
+func (c *ClientKeyManager) loadKeys() (err error) {
+	// Load authorized keys file
+	var clients []PublicKey
+	if c.clientFile != "" {
+		clients, err = LoadKeySetFile(c.clientFile)
+		if err != nil {
+			return fmt.Errorf("unable to load authorized keys: %s", err)
+		}
+	}
+
+	// Add clients from authorized keys directory
+	files, err := ioutil.ReadDir(c.clientDir)
+	if err != nil && !os.IsNotExist(err) {
+		return fmt.Errorf("unable to open authorized keys directory: %s", err)
+	}
+	for _, f := range files {
+		if !f.IsDir() {
+			publicKey, err := LoadPublicKeyFile(path.Join(c.clientDir, f.Name()))
+			if err != nil {
+				return fmt.Errorf("unable to load authorized key file: %s", err)
+			}
+			clients = append(clients, publicKey)
+		}
+	}
+
+	c.clientLock.Lock()
+	c.clients = clients
+	c.clientLock.Unlock()
+
+	return nil
+}
+
+// RegisterTLSConfig registers a tls configuration to manager
+// such that any changes to the keys may be reflected in
+// the tls client CA pool
+func (c *ClientKeyManager) RegisterTLSConfig(tlsConfig *tls.Config) error {
+	c.clientLock.RLock()
+	certPool, err := GenerateCACertPool(c.key, c.clients)
+	if err != nil {
+		return fmt.Errorf("CA pool generation error: %s", err)
+	}
+	c.clientLock.RUnlock()
+
+	tlsConfig.ClientCAs = certPool
+
+	c.configLock.Lock()
+	c.configs = append(c.configs, tlsConfig)
+	c.configLock.Unlock()
+
+	return nil
+}
+
+// NewIdentityAuthTLSConfig creates a tls.Config for the server to use for
+// libtrust identity authentication for the domain specified
+func NewIdentityAuthTLSConfig(trustKey PrivateKey, clients *ClientKeyManager, addr string, domain string) (*tls.Config, error) {
+	tlsConfig := newTLSConfig()
+
+	tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
+	if err := clients.RegisterTLSConfig(tlsConfig); err != nil {
+		return nil, err
+	}
+
+	// Generate cert
+	ips, domains, err := parseAddr(addr)
+	if err != nil {
+		return nil, err
+	}
+	// add domain that it expects clients to use
+	domains = append(domains, domain)
+	x509Cert, err := GenerateSelfSignedServerCert(trustKey, domains, ips)
+	if err != nil {
+		return nil, fmt.Errorf("certificate generation error: %s", err)
+	}
+	tlsConfig.Certificates = []tls.Certificate{{
+		Certificate: [][]byte{x509Cert.Raw},
+		PrivateKey:  trustKey.CryptoPrivateKey(),
+		Leaf:        x509Cert,
+	}}
+
+	return tlsConfig, nil
+}
+
+// NewCertAuthTLSConfig creates a tls.Config for the server to use for
+// certificate authentication
+func NewCertAuthTLSConfig(caPath, certPath, keyPath string) (*tls.Config, error) {
+	tlsConfig := newTLSConfig()
+
+	cert, err := tls.LoadX509KeyPair(certPath, keyPath)
+	if err != nil {
+		return nil, fmt.Errorf("Couldn't load X509 key pair (%s, %s): %s. Key encrypted?", certPath, keyPath, err)
+	}
+	tlsConfig.Certificates = []tls.Certificate{cert}
+
+	// Verify client certificates against a CA?
+	if caPath != "" {
+		certPool := x509.NewCertPool()
+		file, err := ioutil.ReadFile(caPath)
+		if err != nil {
+			return nil, fmt.Errorf("Couldn't read CA certificate: %s", err)
+		}
+		certPool.AppendCertsFromPEM(file)
+
+		tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
+		tlsConfig.ClientCAs = certPool
+	}
+
+	return tlsConfig, nil
+}
+
+func newTLSConfig() *tls.Config {
+	return &tls.Config{
+		NextProtos: []string{"http/1.1"},
+		// Avoid fallback on insecure SSL protocols
+		MinVersion: tls.VersionTLS10,
+	}
+}
+
+// parseAddr parses an address into an array of IPs and domains
+func parseAddr(addr string) ([]net.IP, []string, error) {
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return nil, nil, err
+	}
+	var domains []string
+	var ips []net.IP
+	ip := net.ParseIP(host)
+	if ip != nil {
+		ips = []net.IP{ip}
+	} else {
+		domains = []string{host}
+	}
+	return ips, domains, nil
+}