open-consul/tlsutil/config.go

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package tlsutil
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"net"
"time"
)
// Config used to create tls.Config
type Config struct {
// VerifyIncoming is used to verify the authenticity of incoming connections.
// This means that TCP requests are forbidden, only allowing for TLS. TLS connections
// must match a provided certificate authority. This can be used to force client auth.
VerifyIncoming bool
// VerifyOutgoing is used to verify the authenticity of outgoing connections.
// This means that TLS requests are used, and TCP requests are not made. TLS connections
// must match a provided certificate authority. This is used to verify authenticity of
// server nodes.
VerifyOutgoing bool
// CAFile is a path to a certificate authority file. This is used with VerifyIncoming
// or VerifyOutgoing to verify the TLS connection.
CAFile string
// CertFile is used to provide a TLS certificate that is used for serving TLS connections.
// Must be provided to serve TLS connections.
CertFile string
// KeyFile is used to provide a TLS key that is used for serving TLS connections.
// Must be provided to serve TLS connections.
KeyFile string
// Node name is the name we use to advertise. Defaults to hostname.
NodeName string
// ServerName is used with the TLS certificate to ensure the name we
// provide matches the certificate
ServerName string
}
// AppendCA opens and parses the CA file and adds the certificates to
// the provided CertPool.
func (c *Config) AppendCA(pool *x509.CertPool) error {
if c.CAFile == "" {
return nil
}
// Read the file
data, err := ioutil.ReadFile(c.CAFile)
if err != nil {
return fmt.Errorf("Failed to read CA file: %v", err)
}
if !pool.AppendCertsFromPEM(data) {
return fmt.Errorf("Failed to parse any CA certificates")
}
return nil
}
// KeyPair is used to open and parse a certificate and key file
func (c *Config) KeyPair() (*tls.Certificate, error) {
if c.CertFile == "" || c.KeyFile == "" {
return nil, nil
}
cert, err := tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
if err != nil {
return nil, fmt.Errorf("Failed to load cert/key pair: %v", err)
}
return &cert, err
}
// OutgoingTLSConfig generates a TLS configuration for outgoing
// requests. It will return a nil config if this configuration should
// not use TLS for outgoing connections.
func (c *Config) OutgoingTLSConfig() (*tls.Config, error) {
if !c.VerifyOutgoing {
return nil, nil
}
// Create the tlsConfig
tlsConfig := &tls.Config{
RootCAs: x509.NewCertPool(),
InsecureSkipVerify: true,
}
if c.ServerName != "" {
tlsConfig.ServerName = c.ServerName
tlsConfig.InsecureSkipVerify = false
}
// Ensure we have a CA if VerifyOutgoing is set
if c.VerifyOutgoing && c.CAFile == "" {
return nil, fmt.Errorf("VerifyOutgoing set, and no CA certificate provided!")
}
// Parse the CA cert if any
err := c.AppendCA(tlsConfig.RootCAs)
if err != nil {
return nil, err
}
// Add cert/key
cert, err := c.KeyPair()
if err != nil {
return nil, err
} else if cert != nil {
tlsConfig.Certificates = []tls.Certificate{*cert}
}
return tlsConfig, nil
}
// Wrap a net.Conn into a client tls connection, performing any
// additional verification as needed.
//
// As of go 1.3, crypto/tls only supports either doing no certificate
// verification, or doing full verification including of the peer's
// DNS name. For consul, we want to validate that the certificate is
// signed by a known CA, but because consul doesn't use DNS names for
// node names, we don't verify the certificate DNS names. Since go 1.3
// no longer supports this mode of operation, we have to do it
// manually.
func WrapTLSClient(conn net.Conn, tlsConfig *tls.Config) (net.Conn, error) {
var err error
var tlsConn *tls.Conn
tlsConn = tls.Client(conn, tlsConfig)
// If crypto/tls is doing verification, there's no need to do
// our own.
if tlsConfig.InsecureSkipVerify == false {
return tlsConn, nil
}
if err = tlsConn.Handshake(); err != nil {
tlsConn.Close()
return nil, err
}
// The following is lightly-modified from the doFullHandshake
// method in crypto/tls's handshake_client.go.
opts := x509.VerifyOptions{
Roots: tlsConfig.RootCAs,
CurrentTime: time.Now(),
DNSName: "",
Intermediates: x509.NewCertPool(),
}
certs := tlsConn.ConnectionState().PeerCertificates
for i, cert := range certs {
if i == 0 {
continue
}
opts.Intermediates.AddCert(cert)
}
_, err = certs[0].Verify(opts)
if err != nil {
tlsConn.Close()
return nil, err
}
return tlsConn, err
}
// IncomingTLSConfig generates a TLS configuration for incoming requests
func (c *Config) IncomingTLSConfig() (*tls.Config, error) {
// Create the tlsConfig
tlsConfig := &tls.Config{
ServerName: c.ServerName,
ClientCAs: x509.NewCertPool(),
ClientAuth: tls.NoClientCert,
}
if tlsConfig.ServerName == "" {
tlsConfig.ServerName = c.NodeName
}
// Parse the CA cert if any
err := c.AppendCA(tlsConfig.ClientCAs)
if err != nil {
return nil, err
}
// Add cert/key
cert, err := c.KeyPair()
if err != nil {
return nil, err
} else if cert != nil {
tlsConfig.Certificates = []tls.Certificate{*cert}
}
// Check if we require verification
if c.VerifyIncoming {
tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
if c.CAFile == "" {
return nil, fmt.Errorf("VerifyIncoming set, and no CA certificate provided!")
}
if cert == nil {
return nil, fmt.Errorf("VerifyIncoming set, and no Cert/Key pair provided!")
}
}
return tlsConfig, nil
}