// ID returns the ID of a given Conn.
func ID(c Conn) string {
l := fmt.Sprintf("%s/%s", c.LocalMultiaddr(), c.LocalPeer().Pretty())
r := fmt.Sprintf("%s/%s", c.RemoteMultiaddr(), c.RemotePeer().Pretty())
lh := u.Hash([]byte(l))
rh := u.Hash([]byte(r))
ch := u.XOR(lh, rh)
return peer.ID(ch).Pretty()
}
// KeyHash hashes a key.
func KeyHash(k Key) ([]byte, error) {
kb, err := k.Bytes()
if err != nil {
return nil, err
}
return u.Hash(kb), nil
}
// RandPeerID generates random "valid" peer IDs. it does not NEED to generate
// keys because it is as if we lost the key right away. fine to read randomness
// and hash it. to generate proper keys and corresponding PeerID, use:
// sk, pk, _ := testutil.RandKeyPair()
// id, _ := peer.IDFromPublicKey(pk)
func RandPeerID() (peer.ID, error) {
buf := make([]byte, 16)
if _, err := io.ReadFull(u.NewTimeSeededRand(), buf); err != nil {
return "", err
}
h := u.Hash(buf)
return peer.ID(h), nil
}
// IDFromPublicKey returns the Peer ID corresponding to pk
func IDFromPublicKey(pk ic.PubKey) (ID, error) {
b, err := pk.Bytes()
if err != nil {
return "", err
}
hash := u.Hash(b)
return ID(hash), nil
}
func (ks *keyset) generate() error {
var err error
ks.sk, ks.pk, err = tu.RandTestKeyPair(512)
if err != nil {
return err
}
bpk, err := ks.pk.Bytes()
if err != nil {
return err
}
ks.hpk = string(u.Hash(bpk))
ks.hpkp = b58.Encode([]byte(ks.hpk))
return nil
}
func (ks *keyset) load(hpkp, skBytesStr string) error {
skBytes, err := base64.StdEncoding.DecodeString(skBytesStr)
if err != nil {
return err
}
ks.sk, err = ic.UnmarshalPrivateKey(skBytes)
if err != nil {
return err
}
ks.pk = ks.sk.GetPublic()
bpk, err := ks.pk.Bytes()
if err != nil {
return err
}
ks.hpk = string(u.Hash(bpk))
ks.hpkp = b58.Encode([]byte(ks.hpk))
if ks.hpkp != hpkp {
return fmt.Errorf("hpkp doesn't match key. %s", hpkp)
}
return nil
}
// runHandshake performs initial communication over insecure channel to share
// keys, IDs, and initiate communication, assigning all necessary params.
// requires the duplex channel to be a msgio.ReadWriter (for framed messaging)
func (s *secureSession) runHandshake() error {
ctx, cancel := context.WithTimeout(s.ctx, HandshakeTimeout) // remove
defer cancel()
// =============================================================================
// step 1. Propose -- propose cipher suite + send pubkeys + nonce
// Generate and send Hello packet.
// Hello = (rand, PublicKey, Supported)
nonceOut := make([]byte, nonceSize)
_, err := rand.Read(nonceOut)
if err != nil {
return err
}
defer log.EventBegin(ctx, "secureHandshake", s).Done()
s.local.permanentPubKey = s.localKey.GetPublic()
myPubKeyBytes, err := s.local.permanentPubKey.Bytes()
if err != nil {
return err
}
proposeOut := new(pb.Propose)
proposeOut.Rand = nonceOut
proposeOut.Pubkey = myPubKeyBytes
proposeOut.Exchanges = &SupportedExchanges
proposeOut.Ciphers = &SupportedCiphers
proposeOut.Hashes = &SupportedHashes
// log.Debugf("1.0 Propose: nonce:%s exchanges:%s ciphers:%s hashes:%s",
// nonceOut, SupportedExchanges, SupportedCiphers, SupportedHashes)
// Send Propose packet (respects ctx)
proposeOutBytes, err := writeMsgCtx(ctx, s.insecureM, proposeOut)
if err != nil {
return err
}
// Receive + Parse their Propose packet and generate an Exchange packet.
proposeIn := new(pb.Propose)
proposeInBytes, err := readMsgCtx(ctx, s.insecureM, proposeIn)
if err != nil {
return err
}
// log.Debugf("1.0.1 Propose recv: nonce:%s exchanges:%s ciphers:%s hashes:%s",
// proposeIn.GetRand(), proposeIn.GetExchanges(), proposeIn.GetCiphers(), proposeIn.GetHashes())
// =============================================================================
// step 1.1 Identify -- get identity from their key
// get remote identity
s.remote.permanentPubKey, err = ci.UnmarshalPublicKey(proposeIn.GetPubkey())
if err != nil {
return err
}
// get peer id
s.remotePeer, err = peer.IDFromPublicKey(s.remote.permanentPubKey)
if err != nil {
return err
}
log.Debugf("1.1 Identify: %s Remote Peer Identified as %s", s.localPeer, s.remotePeer)
// =============================================================================
// step 1.2 Selection -- select/agree on best encryption parameters
// to determine order, use cmp(H(remote_pubkey||local_rand), H(local_pubkey||remote_rand)).
oh1 := u.Hash(append(proposeIn.GetPubkey(), nonceOut...))
oh2 := u.Hash(append(myPubKeyBytes, proposeIn.GetRand()...))
order := bytes.Compare(oh1, oh2)
if order == 0 {
return ErrEcho // talking to self (same socket. must be reuseport + dialing self)
}
s.local.curveT, err = selectBest(order, SupportedExchanges, proposeIn.GetExchanges())
if err != nil {
return err
}
s.local.cipherT, err = selectBest(order, SupportedCiphers, proposeIn.GetCiphers())
if err != nil {
return err
}
s.local.hashT, err = selectBest(order, SupportedHashes, proposeIn.GetHashes())
if err != nil {
return err
}
// we use the same params for both directions (must choose same curve)
// WARNING: if they dont SelectBest the same way, this won't work...
s.remote.curveT = s.local.curveT
s.remote.cipherT = s.local.cipherT
s.remote.hashT = s.local.hashT
// log.Debugf("1.2 selection: exchange:%s cipher:%s hash:%s",
// s.local.curveT, s.local.cipherT, s.local.hashT)
// =============================================================================
// step 2. Exchange -- exchange (signed) ephemeral keys. verify signatures.
// Generate EphemeralPubKey
var genSharedKey ci.GenSharedKey
s.local.ephemeralPubKey, genSharedKey, err = ci.GenerateEKeyPair(s.local.curveT)
// Gather corpus to sign.
selectionOut := new(bytes.Buffer)
selectionOut.Write(proposeOutBytes)
selectionOut.Write(proposeInBytes)
selectionOut.Write(s.local.ephemeralPubKey)
selectionOutBytes := selectionOut.Bytes()
// log.Debugf("2.0 exchange: %v", selectionOutBytes)
exchangeOut := new(pb.Exchange)
exchangeOut.Epubkey = s.local.ephemeralPubKey
exchangeOut.Signature, err = s.localKey.Sign(selectionOutBytes)
if err != nil {
return err
}
// Send Propose packet (respects ctx)
if _, err := writeMsgCtx(ctx, s.insecureM, exchangeOut); err != nil {
return err
}
// Receive + Parse their Exchange packet.
exchangeIn := new(pb.Exchange)
if _, err := readMsgCtx(ctx, s.insecureM, exchangeIn); err != nil {
return err
}
// =============================================================================
// step 2.1. Verify -- verify their exchange packet is good.
// get their ephemeral pub key
s.remote.ephemeralPubKey = exchangeIn.GetEpubkey()
selectionIn := new(bytes.Buffer)
selectionIn.Write(proposeInBytes)
selectionIn.Write(proposeOutBytes)
selectionIn.Write(s.remote.ephemeralPubKey)
selectionInBytes := selectionIn.Bytes()
// log.Debugf("2.0.1 exchange recv: %v", selectionInBytes)
// u.POut("Remote Peer Identified as %s\n", s.remote)
sigOK, err := s.remote.permanentPubKey.Verify(selectionInBytes, exchangeIn.GetSignature())
if err != nil {
// log.Error("2.1 Verify: failed: %s", err)
return err
}
if !sigOK {
err := errors.New("Bad signature!")
// log.Error("2.1 Verify: failed: %s", err)
return err
}
// log.Debugf("2.1 Verify: signature verified.")
// =============================================================================
// step 2.2. Keys -- generate keys for mac + encryption
// OK! seems like we're good to go.
s.sharedSecret, err = genSharedKey(exchangeIn.GetEpubkey())
if err != nil {
return err
}
// generate two sets of keys (stretching)
k1, k2 := ci.KeyStretcher(s.local.cipherT, s.local.hashT, s.sharedSecret)
// use random nonces to decide order.
switch {
case order > 0:
// just break
case order < 0:
k1, k2 = k2, k1 // swap
default:
// we should've bailed before this. but if not, bail here.
return ErrEcho
}
s.local.keys = k1
s.remote.keys = k2
// log.Debug("2.2 keys:\n\tshared: %v\n\tk1: %v\n\tk2: %v",
// s.sharedSecret, s.local.keys, s.remote.keys)
// =============================================================================
// step 2.3. MAC + Cipher -- prepare MAC + cipher
if err := s.local.makeMacAndCipher(); err != nil {
return err
}
if err := s.remote.makeMacAndCipher(); err != nil {
return err
}
// log.Debug("2.3 mac + cipher.")
// =============================================================================
// step 3. Finish -- send expected message to verify encryption works (send local nonce)
// setup ETM ReadWriter
w := NewETMWriter(s.insecure, s.local.cipher, s.local.mac)
r := NewETMReader(s.insecure, s.remote.cipher, s.remote.mac)
s.secure = msgio.Combine(w, r).(msgio.ReadWriteCloser)
// log.Debug("3.0 finish. sending: %v", proposeIn.GetRand())
// send their Nonce.
if _, err := s.secure.Write(proposeIn.GetRand()); err != nil {
return fmt.Errorf("Failed to write Finish nonce: %s", err)
}
// read our Nonce
nonceOut2 := make([]byte, len(nonceOut))
if _, err := io.ReadFull(s.secure, nonceOut2); err != nil {
return fmt.Errorf("Failed to read Finish nonce: %s", err)
}
// log.Debug("3.0 finish.\n\texpect: %v\n\tactual: %v", nonceOut, nonceOut2)
if !bytes.Equal(nonceOut, nonceOut2) {
return fmt.Errorf("Failed to read our encrypted nonce: %s != %s", nonceOut2, nonceOut)
}
// Whew! ok, that's all folks.
return nil
}
func newPeerTime(t time.Time) peer.ID {
s := fmt.Sprintf("hmmm time: %v", t)
h := u.Hash([]byte(s))
return peer.ID(h)
}