Example #1
0
func build_subcircuit() (*Subcircuit, error) {
	slc := dirclient.FindPath(MasterConfig.Network.MinCircuitLen)
	DEBUG("Building a subcicruit with minlen %d...", len(slc))
	// this returns a checker whether a public key is valid
	pubkey_checker := func(hsh string) kiss.Verifier {
		return func(k *big.Int) bool {
			hashed := hash_base32(k.Bytes())
			return subtle.ConstantTimeCompare([]byte(hashed), []byte(hsh)) == 1
		}
	}
	// circuit-building loop
	iwire, err := net.Dial("tcp", slc[0].Address)
	if err != nil {
		return nil, err
	}
	iwire, err = kiss.Kiriobfs_handshake_client(iwire)
	if err != nil {
		//iwire.Close()
		return nil, err
	}
	wire, err := kiss.KiSS_handshake_client(
		iwire, pubkey_checker(slc[0].PublicKey))
	if err != nil {
		//wire.Close()
		return nil, err
	}
	for idx, ele := range slc[1:] {
		DEBUG("Extending circuit to length %d...", idx+2)
		// extend wire
		err = write_sc_message(sc_message{SC_EXTEND, ele.PublicKey}, wire)
		if err != nil {
			wire.Close()
			return nil, err
		}

		verifier := pubkey_checker(ele.PublicKey)
		// at this point wire is raw (well unobfs) connection to next
		wire, err = kiss.KiSS_handshake_client(wire, verifier)
		if err != nil {
			//wire.Close()
			return nil, err
		}
		DEBUG("Extended circuit to length %d", idx+2)
	}
	err = write_sc_message(sc_message{SC_TERMINATE, ""}, wire)
	if err != nil {
		return nil, err
	}
	DEBUG("Subcircuit building complete with length %d", len(slc))
	toret := Subcircuit{slc, wire}
	return &toret, nil
}
Example #2
0
func sc_server_handler(wire net.Conn) error {
	defer wire.Close()
	owire, err := kiss.Kiriobfs_handshake_server(wire)
	if err != nil {
		//log.Error(err.Error())
		return err
	}
	log.Debug("Of dones for obfs layer")
	awire, err := kiss.KiSS_handshake_server(owire, MasterKey)
	if err != nil {
		//log.Error(err.Error())
		return err
	}
	log.Debug("Of dones in kiss layer")
	// Now awire is the wire
	cmd, err := read_sc_message(awire)
	if err != nil {
		log.Error(err.Error())
		return err
	}
	log.Debug(cmd)
	if cmd.Msg_type == SC_EXTEND {
		theirnode := dirclient.PKeyLookup(cmd.Msg_arg)
		if theirnode == nil {
			return errors.New("Watif")
		}
		actwire, err := net.Dial("tcp", theirnode.Address)
		if err != nil {
			return err
		}
		remwire, err := kiss.Kiriobfs_handshake_client(actwire)
		if err != nil {
			return err
		}
		go func() {
			io.Copy(remwire, awire)
			remwire.Close()
		}()
		io.Copy(awire, remwire)
		awire.Close()
	} else if cmd.Msg_type == SC_TERMINATE && MasterConfig.General.IsExit {
		e2e_server_handler(newGobWire(awire))
	}
	return nil
}