149 lines
3.6 KiB
Go
149 lines
3.6 KiB
Go
package libp2ptls
|
|
|
|
import (
|
|
"context"
|
|
"crypto/tls"
|
|
"errors"
|
|
"net"
|
|
"sync"
|
|
|
|
ci "github.com/libp2p/go-libp2p-core/crypto"
|
|
"github.com/libp2p/go-libp2p-core/peer"
|
|
"github.com/libp2p/go-libp2p-core/sec"
|
|
)
|
|
|
|
// ID is the protocol ID (used when negotiating with multistream)
|
|
const ID = "/tls/1.0.0"
|
|
|
|
// Transport constructs secure communication sessions for a peer.
|
|
type Transport struct {
|
|
identity *Identity
|
|
|
|
localPeer peer.ID
|
|
privKey ci.PrivKey
|
|
}
|
|
|
|
// New creates a TLS encrypted transport
|
|
func New(key ci.PrivKey) (*Transport, error) {
|
|
id, err := peer.IDFromPrivateKey(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
t := &Transport{
|
|
localPeer: id,
|
|
privKey: key,
|
|
}
|
|
|
|
identity, err := NewIdentity(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
t.identity = identity
|
|
return t, nil
|
|
}
|
|
|
|
var _ sec.SecureTransport = &Transport{}
|
|
|
|
// SecureInbound runs the TLS handshake as a server.
|
|
// If p is empty, connections from any peer are accepted.
|
|
func (t *Transport) SecureInbound(ctx context.Context, insecure net.Conn, p peer.ID) (sec.SecureConn, error) {
|
|
config, keyCh := t.identity.ConfigForPeer(p)
|
|
cs, err := t.handshake(ctx, tls.Server(insecure, config), keyCh)
|
|
if err != nil {
|
|
insecure.Close()
|
|
}
|
|
return cs, err
|
|
}
|
|
|
|
// SecureOutbound runs the TLS handshake as a client.
|
|
// Note that SecureOutbound will not return an error if the server doesn't
|
|
// accept the certificate. This is due to the fact that in TLS 1.3, the client
|
|
// sends its certificate and the ClientFinished in the same flight, and can send
|
|
// application data immediately afterwards.
|
|
// If the handshake fails, the server will close the connection. The client will
|
|
// notice this after 1 RTT when calling Read.
|
|
func (t *Transport) SecureOutbound(ctx context.Context, insecure net.Conn, p peer.ID) (sec.SecureConn, error) {
|
|
config, keyCh := t.identity.ConfigForPeer(p)
|
|
cs, err := t.handshake(ctx, tls.Client(insecure, config), keyCh)
|
|
if err != nil {
|
|
insecure.Close()
|
|
}
|
|
return cs, err
|
|
}
|
|
|
|
func (t *Transport) handshake(
|
|
ctx context.Context,
|
|
tlsConn *tls.Conn,
|
|
keyCh <-chan ci.PubKey,
|
|
) (sec.SecureConn, error) {
|
|
// There's no way to pass a context to tls.Conn.Handshake().
|
|
// See https://github.com/golang/go/issues/18482.
|
|
// Close the connection instead.
|
|
select {
|
|
case <-ctx.Done():
|
|
tlsConn.Close()
|
|
default:
|
|
}
|
|
|
|
done := make(chan struct{})
|
|
var wg sync.WaitGroup
|
|
|
|
// Ensure that we do not return before
|
|
// either being done or having a context
|
|
// cancellation.
|
|
defer wg.Wait()
|
|
defer close(done)
|
|
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
select {
|
|
case <-done:
|
|
case <-ctx.Done():
|
|
tlsConn.Close()
|
|
}
|
|
}()
|
|
|
|
if err := tlsConn.Handshake(); err != nil {
|
|
// if the context was canceled, return the context error
|
|
if ctxErr := ctx.Err(); ctxErr != nil {
|
|
return nil, ctxErr
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
// Should be ready by this point, don't block.
|
|
var remotePubKey ci.PubKey
|
|
select {
|
|
case remotePubKey = <-keyCh:
|
|
default:
|
|
}
|
|
if remotePubKey == nil {
|
|
return nil, errors.New("go-libp2p-tls BUG: expected remote pub key to be set")
|
|
}
|
|
|
|
conn, err := t.setupConn(tlsConn, remotePubKey)
|
|
if err != nil {
|
|
// if the context was canceled, return the context error
|
|
if ctxErr := ctx.Err(); ctxErr != nil {
|
|
return nil, ctxErr
|
|
}
|
|
return nil, err
|
|
}
|
|
return conn, nil
|
|
}
|
|
|
|
func (t *Transport) setupConn(tlsConn *tls.Conn, remotePubKey ci.PubKey) (sec.SecureConn, error) {
|
|
remotePeerID, err := peer.IDFromPublicKey(remotePubKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &conn{
|
|
Conn: tlsConn,
|
|
localPeer: t.localPeer,
|
|
privKey: t.privKey,
|
|
remotePeer: remotePeerID,
|
|
remotePubKey: remotePubKey,
|
|
}, nil
|
|
}
|