// Performs handshake and returns a new authenticated SecretConnection.
// Returns nil if error in handshake.
// Caller should call conn.Close()
// See docs/sts-final.pdf for more information.
func MakeSecretConnection(conn io.ReadWriteCloser, locPrivKey acm.PrivKeyEd25519) (*SecretConnection, error) {
locPubKey := locPrivKey.PubKey().(acm.PubKeyEd25519)
// Generate ephemeral keys for perfect forward secrecy.
locEphPub, locEphPriv := genEphKeys()
// Write local ephemeral pubkey and receive one too.
// NOTE: every 32-byte string is accepted as a Curve25519 public key
// (see DJB's Curve25519 paper: http://cr.yp.to/ecdh/curve25519-20060209.pdf)
remEphPub, err := shareEphPubKey(conn, locEphPub)
if err != nil {
return nil, err
}
// Compute common shared secret.
shrSecret := computeSharedSecret(remEphPub, locEphPriv)
// Sort by lexical order.
loEphPub, hiEphPub := sort32(locEphPub, remEphPub)
// Generate nonces to use for secretbox.
recvNonce, sendNonce := genNonces(loEphPub, hiEphPub, locEphPub == loEphPub)
// Generate common challenge to sign.
challenge := genChallenge(loEphPub, hiEphPub)
// Construct SecretConnection.
sc := &SecretConnection{
conn: conn,
recvBuffer: nil,
recvNonce: recvNonce,
sendNonce: sendNonce,
shrSecret: shrSecret,
}
// Sign the challenge bytes for authentication.
locSignature := signChallenge(challenge, locPrivKey)
// Share (in secret) each other's pubkey & challenge signature
authSigMsg, err := shareAuthSignature(sc, locPubKey, locSignature)
if err != nil {
return nil, err
}
remPubKey, remSignature := authSigMsg.Key, authSigMsg.Sig
if !remPubKey.VerifyBytes(challenge[:], remSignature) {
return nil, errors.New("Challenge verification failed")
}
// We've authorized.
sc.remPubKey = remPubKey
return sc, nil
}
func makeNodeInfo(sw *p2p.Switch, privKey acm.PrivKeyEd25519) *types.NodeInfo {
nodeInfo := &types.NodeInfo{
PubKey: privKey.PubKey().(acm.PubKeyEd25519),
Moniker: config.GetString("moniker"),
ChainID: config.GetString("chain_id"),
Version: types.Versions{
Tendermint: Version,
P2P: p2p.Version,
RPC: rpc.Version,
Wire: wire.Version,
},
}
// include git hash in the nodeInfo if available
if rev, err := ReadFile(config.GetString("revision_file")); err == nil {
nodeInfo.Version.Revision = string(rev)
}
if !sw.IsListening() {
return nodeInfo
}
p2pListener := sw.Listeners()[0]
p2pHost := p2pListener.ExternalAddress().IP.String()
p2pPort := p2pListener.ExternalAddress().Port
rpcListenAddr := config.GetString("rpc_laddr")
_, rpcPortStr, _ := net.SplitHostPort(rpcListenAddr)
rpcPort, err := strconv.Atoi(rpcPortStr)
if err != nil {
PanicSanity(Fmt("Expected numeric RPC.ListenAddr port but got %v", rpcPortStr))
}
// We assume that the rpcListener has the same ExternalAddress.
// This is probably true because both P2P and RPC listeners use UPnP,
// except of course if the rpc is only bound to localhost
nodeInfo.Host = p2pHost
nodeInfo.P2PPort = p2pPort
nodeInfo.RPCPort = uint16(rpcPort)
return nodeInfo
}
// Not goroutine safe.
// NOTE: Overwrites sw.nodeInfo.PubKey
func (sw *Switch) SetNodePrivKey(nodePrivKey acm.PrivKeyEd25519) {
sw.nodePrivKey = nodePrivKey
if sw.nodeInfo != nil {
sw.nodeInfo.PubKey = nodePrivKey.PubKey().(acm.PubKeyEd25519)
}
}
func signChallenge(challenge *[32]byte, locPrivKey acm.PrivKeyEd25519) (signature acm.SignatureEd25519) {
signature = locPrivKey.Sign(challenge[:]).(acm.SignatureEd25519)
return
}