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538 lines
12 KiB
538 lines
12 KiB
package privval
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"time"
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"github.com/tendermint/go-amino"
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"github.com/tendermint/go-crypto"
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cmn "github.com/tendermint/tmlibs/common"
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"github.com/tendermint/tmlibs/log"
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p2pconn "github.com/tendermint/tendermint/p2p/conn"
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"github.com/tendermint/tendermint/types"
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)
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const (
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defaultAcceptDeadlineSeconds = 3
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defaultConnDeadlineSeconds = 3
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defaultConnHeartBeatSeconds = 30
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defaultConnWaitSeconds = 60
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defaultDialRetries = 10
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)
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// Socket errors.
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var (
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ErrDialRetryMax = errors.New("dialed maximum retries")
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ErrConnWaitTimeout = errors.New("waited for remote signer for too long")
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ErrConnTimeout = errors.New("remote signer timed out")
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)
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var (
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acceptDeadline = time.Second + defaultAcceptDeadlineSeconds
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connDeadline = time.Second * defaultConnDeadlineSeconds
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connHeartbeat = time.Second * defaultConnHeartBeatSeconds
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)
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// SocketPVOption sets an optional parameter on the SocketPV.
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type SocketPVOption func(*SocketPV)
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// SocketPVAcceptDeadline sets the deadline for the SocketPV listener.
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// A zero time value disables the deadline.
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func SocketPVAcceptDeadline(deadline time.Duration) SocketPVOption {
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return func(sc *SocketPV) { sc.acceptDeadline = deadline }
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}
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// SocketPVConnDeadline sets the read and write deadline for connections
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// from external signing processes.
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func SocketPVConnDeadline(deadline time.Duration) SocketPVOption {
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return func(sc *SocketPV) { sc.connDeadline = deadline }
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}
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// SocketPVHeartbeat sets the period on which to check the liveness of the
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// connected Signer connections.
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func SocketPVHeartbeat(period time.Duration) SocketPVOption {
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return func(sc *SocketPV) { sc.connHeartbeat = period }
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}
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// SocketPVConnWait sets the timeout duration before connection of external
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// signing processes are considered to be unsuccessful.
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func SocketPVConnWait(timeout time.Duration) SocketPVOption {
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return func(sc *SocketPV) { sc.connWaitTimeout = timeout }
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}
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// SocketPV implements PrivValidator, it uses a socket to request signatures
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// from an external process.
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type SocketPV struct {
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cmn.BaseService
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addr string
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acceptDeadline time.Duration
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connDeadline time.Duration
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connHeartbeat time.Duration
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connWaitTimeout time.Duration
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privKey crypto.PrivKeyEd25519
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conn net.Conn
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listener net.Listener
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}
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// Check that SocketPV implements PrivValidator.
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var _ types.PrivValidator = (*SocketPV)(nil)
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// NewSocketPV returns an instance of SocketPV.
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func NewSocketPV(
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logger log.Logger,
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socketAddr string,
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privKey crypto.PrivKeyEd25519,
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) *SocketPV {
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sc := &SocketPV{
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addr: socketAddr,
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acceptDeadline: acceptDeadline,
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connDeadline: connDeadline,
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connHeartbeat: connHeartbeat,
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connWaitTimeout: time.Second * defaultConnWaitSeconds,
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privKey: privKey,
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}
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sc.BaseService = *cmn.NewBaseService(logger, "SocketPV", sc)
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return sc
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}
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// GetAddress implements PrivValidator.
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func (sc *SocketPV) GetAddress() types.Address {
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addr, err := sc.getAddress()
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if err != nil {
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panic(err)
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}
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return addr
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}
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// Address is an alias for PubKey().Address().
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func (sc *SocketPV) getAddress() (cmn.HexBytes, error) {
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p, err := sc.getPubKey()
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if err != nil {
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return nil, err
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}
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return p.Address(), nil
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}
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// GetPubKey implements PrivValidator.
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func (sc *SocketPV) GetPubKey() crypto.PubKey {
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pubKey, err := sc.getPubKey()
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if err != nil {
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panic(err)
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}
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return pubKey
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}
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func (sc *SocketPV) getPubKey() (crypto.PubKey, error) {
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err := writeMsg(sc.conn, &PubKeyMsg{})
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if err != nil {
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return nil, err
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}
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res, err := readMsg(sc.conn)
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if err != nil {
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return nil, err
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}
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return res.(*PubKeyMsg).PubKey, nil
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}
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// SignVote implements PrivValidator.
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func (sc *SocketPV) SignVote(chainID string, vote *types.Vote) error {
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err := writeMsg(sc.conn, &SignVoteMsg{Vote: vote})
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if err != nil {
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return err
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}
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res, err := readMsg(sc.conn)
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if err != nil {
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return err
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}
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*vote = *res.(*SignVoteMsg).Vote
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return nil
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}
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// SignProposal implements PrivValidator.
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func (sc *SocketPV) SignProposal(
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chainID string,
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proposal *types.Proposal,
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) error {
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err := writeMsg(sc.conn, &SignProposalMsg{Proposal: proposal})
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if err != nil {
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return err
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}
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res, err := readMsg(sc.conn)
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if err != nil {
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return err
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}
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*proposal = *res.(*SignProposalMsg).Proposal
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return nil
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}
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// SignHeartbeat implements PrivValidator.
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func (sc *SocketPV) SignHeartbeat(
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chainID string,
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heartbeat *types.Heartbeat,
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) error {
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err := writeMsg(sc.conn, &SignHeartbeatMsg{Heartbeat: heartbeat})
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if err != nil {
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return err
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}
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res, err := readMsg(sc.conn)
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if err != nil {
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return err
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}
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*heartbeat = *res.(*SignHeartbeatMsg).Heartbeat
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return nil
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}
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// OnStart implements cmn.Service.
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func (sc *SocketPV) OnStart() error {
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if err := sc.listen(); err != nil {
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err = cmn.ErrorWrap(err, "failed to listen")
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sc.Logger.Error(
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"OnStart",
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"err", err,
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)
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return err
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}
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conn, err := sc.waitConnection()
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if err != nil {
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err = cmn.ErrorWrap(err, "failed to accept connection")
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sc.Logger.Error(
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"OnStart",
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"err", err,
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)
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return err
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}
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sc.conn = conn
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return nil
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}
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// OnStop implements cmn.Service.
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func (sc *SocketPV) OnStop() {
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if sc.conn != nil {
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if err := sc.conn.Close(); err != nil {
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err = cmn.ErrorWrap(err, "failed to close connection")
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sc.Logger.Error(
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"OnStop",
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"err", err,
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)
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}
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}
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if sc.listener != nil {
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if err := sc.listener.Close(); err != nil {
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err = cmn.ErrorWrap(err, "failed to close listener")
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sc.Logger.Error(
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"OnStop",
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"err", err,
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)
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}
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}
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}
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func (sc *SocketPV) acceptConnection() (net.Conn, error) {
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conn, err := sc.listener.Accept()
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if err != nil {
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if !sc.IsRunning() {
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return nil, nil // Ignore error from listener closing.
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}
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return nil, err
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}
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conn, err = p2pconn.MakeSecretConnection(conn, sc.privKey)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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func (sc *SocketPV) listen() error {
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ln, err := net.Listen(cmn.ProtocolAndAddress(sc.addr))
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if err != nil {
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return err
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}
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sc.listener = newTCPTimeoutListener(
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ln,
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sc.acceptDeadline,
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sc.connDeadline,
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sc.connHeartbeat,
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)
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return nil
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}
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// waitConnection uses the configured wait timeout to error if no external
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// process connects in the time period.
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func (sc *SocketPV) waitConnection() (net.Conn, error) {
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var (
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connc = make(chan net.Conn, 1)
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errc = make(chan error, 1)
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)
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go func(connc chan<- net.Conn, errc chan<- error) {
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conn, err := sc.acceptConnection()
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if err != nil {
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errc <- err
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return
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}
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connc <- conn
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}(connc, errc)
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select {
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case conn := <-connc:
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return conn, nil
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case err := <-errc:
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if _, ok := err.(timeoutError); ok {
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return nil, cmn.ErrorWrap(ErrConnWaitTimeout, err.Error())
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}
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return nil, err
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case <-time.After(sc.connWaitTimeout):
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return nil, ErrConnWaitTimeout
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}
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}
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//---------------------------------------------------------
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// RemoteSignerOption sets an optional parameter on the RemoteSigner.
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type RemoteSignerOption func(*RemoteSigner)
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// RemoteSignerConnDeadline sets the read and write deadline for connections
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// from external signing processes.
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func RemoteSignerConnDeadline(deadline time.Duration) RemoteSignerOption {
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return func(ss *RemoteSigner) { ss.connDeadline = deadline }
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}
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// RemoteSignerConnRetries sets the amount of attempted retries to connect.
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func RemoteSignerConnRetries(retries int) RemoteSignerOption {
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return func(ss *RemoteSigner) { ss.connRetries = retries }
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}
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// RemoteSigner implements PrivValidator by dialing to a socket.
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type RemoteSigner struct {
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cmn.BaseService
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addr string
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chainID string
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connDeadline time.Duration
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connRetries int
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privKey crypto.PrivKeyEd25519
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privVal types.PrivValidator
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conn net.Conn
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}
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// NewRemoteSigner returns an instance of RemoteSigner.
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func NewRemoteSigner(
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logger log.Logger,
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chainID, socketAddr string,
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privVal types.PrivValidator,
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privKey crypto.PrivKeyEd25519,
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) *RemoteSigner {
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rs := &RemoteSigner{
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addr: socketAddr,
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chainID: chainID,
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connDeadline: time.Second * defaultConnDeadlineSeconds,
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connRetries: defaultDialRetries,
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privKey: privKey,
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privVal: privVal,
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}
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rs.BaseService = *cmn.NewBaseService(logger, "RemoteSigner", rs)
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return rs
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}
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// OnStart implements cmn.Service.
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func (rs *RemoteSigner) OnStart() error {
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conn, err := rs.connect()
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if err != nil {
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err = cmn.ErrorWrap(err, "connect")
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rs.Logger.Error("OnStart", "err", err)
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return err
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}
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go rs.handleConnection(conn)
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return nil
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}
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// OnStop implements cmn.Service.
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func (rs *RemoteSigner) OnStop() {
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if rs.conn == nil {
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return
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}
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if err := rs.conn.Close(); err != nil {
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rs.Logger.Error("OnStop", "err", cmn.ErrorWrap(err, "closing listener failed"))
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}
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}
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func (rs *RemoteSigner) connect() (net.Conn, error) {
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for retries := rs.connRetries; retries > 0; retries-- {
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// Don't sleep if it is the first retry.
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if retries != rs.connRetries {
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time.Sleep(rs.connDeadline)
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}
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conn, err := cmn.Connect(rs.addr)
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if err != nil {
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err = cmn.ErrorWrap(err, "connection failed")
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rs.Logger.Error(
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"connect",
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"addr", rs.addr,
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"err", err,
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)
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continue
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}
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if err := conn.SetDeadline(time.Now().Add(connDeadline)); err != nil {
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err = cmn.ErrorWrap(err, "setting connection timeout failed")
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rs.Logger.Error(
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"connect",
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"err", err,
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)
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continue
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}
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conn, err = p2pconn.MakeSecretConnection(conn, rs.privKey)
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if err != nil {
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err = cmn.ErrorWrap(err, "encrypting connection failed")
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rs.Logger.Error(
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"connect",
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"err", err,
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)
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continue
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}
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return conn, nil
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}
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return nil, ErrDialRetryMax
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}
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func (rs *RemoteSigner) handleConnection(conn net.Conn) {
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for {
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if !rs.IsRunning() {
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return // Ignore error from listener closing.
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}
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req, err := readMsg(conn)
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if err != nil {
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if err != io.EOF {
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rs.Logger.Error("handleConnection", "err", err)
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}
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return
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}
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var res SocketPVMsg
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switch r := req.(type) {
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case *PubKeyMsg:
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var p crypto.PubKey
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p = rs.privVal.GetPubKey()
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res = &PubKeyMsg{p}
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case *SignVoteMsg:
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err = rs.privVal.SignVote(rs.chainID, r.Vote)
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res = &SignVoteMsg{r.Vote}
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case *SignProposalMsg:
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err = rs.privVal.SignProposal(rs.chainID, r.Proposal)
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res = &SignProposalMsg{r.Proposal}
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case *SignHeartbeatMsg:
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err = rs.privVal.SignHeartbeat(rs.chainID, r.Heartbeat)
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res = &SignHeartbeatMsg{r.Heartbeat}
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default:
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err = fmt.Errorf("unknown msg: %v", r)
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}
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if err != nil {
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rs.Logger.Error("handleConnection", "err", err)
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return
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}
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err = writeMsg(conn, res)
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if err != nil {
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rs.Logger.Error("handleConnection", "err", err)
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return
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}
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}
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}
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//---------------------------------------------------------
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// SocketPVMsg is sent between RemoteSigner and SocketPV.
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type SocketPVMsg interface{}
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func RegisterSocketPVMsg(cdc *amino.Codec) {
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cdc.RegisterInterface((*SocketPVMsg)(nil), nil)
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cdc.RegisterConcrete(&PubKeyMsg{}, "tendermint/socketpv/PubKeyMsg", nil)
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cdc.RegisterConcrete(&SignVoteMsg{}, "tendermint/socketpv/SignVoteMsg", nil)
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cdc.RegisterConcrete(&SignProposalMsg{}, "tendermint/socketpv/SignProposalMsg", nil)
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cdc.RegisterConcrete(&SignHeartbeatMsg{}, "tendermint/socketpv/SignHeartbeatMsg", nil)
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}
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// PubKeyMsg is a PrivValidatorSocket message containing the public key.
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type PubKeyMsg struct {
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PubKey crypto.PubKey
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}
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// SignVoteMsg is a PrivValidatorSocket message containing a vote.
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type SignVoteMsg struct {
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Vote *types.Vote
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}
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// SignProposalMsg is a PrivValidatorSocket message containing a Proposal.
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type SignProposalMsg struct {
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Proposal *types.Proposal
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}
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// SignHeartbeatMsg is a PrivValidatorSocket message containing a Heartbeat.
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type SignHeartbeatMsg struct {
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Heartbeat *types.Heartbeat
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}
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func readMsg(r io.Reader) (msg SocketPVMsg, err error) {
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const maxSocketPVMsgSize = 1024 * 10
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_, err = cdc.UnmarshalBinaryReader(r, &msg, maxSocketPVMsgSize)
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if _, ok := err.(timeoutError); ok {
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err = cmn.ErrorWrap(ErrConnTimeout, err.Error())
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}
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return
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}
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func writeMsg(w io.Writer, msg interface{}) (err error) {
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_, err = cdc.MarshalBinaryWriter(w, msg)
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if _, ok := err.(timeoutError); ok {
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err = cmn.ErrorWrap(ErrConnTimeout, err.Error())
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}
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return
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}
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