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260 lines
6.6 KiB
260 lines
6.6 KiB
package privval
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import (
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"fmt"
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"io"
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"net"
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"github.com/pkg/errors"
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"github.com/tendermint/go-amino"
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"github.com/tendermint/tendermint/crypto"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/types"
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)
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// Socket errors.
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var (
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ErrConnTimeout = errors.New("remote signer timed out")
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)
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// RemoteSignerClient implements PrivValidator.
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// It uses a net.Conn to request signatures
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// from an external process.
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type RemoteSignerClient struct {
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conn net.Conn
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// memoized
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consensusPubKey crypto.PubKey
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}
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// Check that RemoteSignerClient implements PrivValidator.
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var _ types.PrivValidator = (*RemoteSignerClient)(nil)
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// NewRemoteSignerClient returns an instance of RemoteSignerClient.
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func NewRemoteSignerClient(conn net.Conn) (*RemoteSignerClient, error) {
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// retrieve and memoize the consensus public key once.
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pubKey, err := getPubKey(conn)
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if err != nil {
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return nil, cmn.ErrorWrap(err, "error while retrieving public key for remote signer")
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}
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return &RemoteSignerClient{
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conn: conn,
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consensusPubKey: pubKey,
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}, nil
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}
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// Close calls Close on the underlying net.Conn.
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func (sc *RemoteSignerClient) Close() error {
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return sc.conn.Close()
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}
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// GetPubKey implements PrivValidator.
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func (sc *RemoteSignerClient) GetPubKey() crypto.PubKey {
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return sc.consensusPubKey
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}
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// not thread-safe (only called on startup).
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func getPubKey(conn net.Conn) (crypto.PubKey, error) {
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err := writeMsg(conn, &PubKeyRequest{})
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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(conn)
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if err != nil {
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return nil, err
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}
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pubKeyResp, ok := res.(*PubKeyResponse)
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if !ok {
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return nil, errors.Wrap(ErrUnexpectedResponse, "response is not PubKeyResponse")
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}
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if pubKeyResp.Error != nil {
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return nil, errors.Wrap(pubKeyResp.Error, "failed to get private validator's public key")
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}
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return pubKeyResp.PubKey, nil
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}
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// SignVote implements PrivValidator.
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func (sc *RemoteSignerClient) SignVote(chainID string, vote *types.Vote) error {
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err := writeMsg(sc.conn, &SignVoteRequest{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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resp, ok := res.(*SignedVoteResponse)
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if !ok {
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return ErrUnexpectedResponse
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}
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if resp.Error != nil {
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return resp.Error
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}
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*vote = *resp.Vote
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return nil
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}
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// SignProposal implements PrivValidator.
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func (sc *RemoteSignerClient) 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, &SignProposalRequest{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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resp, ok := res.(*SignedProposalResponse)
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if !ok {
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return ErrUnexpectedResponse
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}
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if resp.Error != nil {
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return resp.Error
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}
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*proposal = *resp.Proposal
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return nil
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}
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// Ping is used to check connection health.
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func (sc *RemoteSignerClient) Ping() error {
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err := writeMsg(sc.conn, &PingRequest{})
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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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_, ok := res.(*PingResponse)
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if !ok {
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return ErrUnexpectedResponse
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}
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return nil
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}
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// RemoteSignerMsg is sent between RemoteSigner and the RemoteSigner client.
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type RemoteSignerMsg interface{}
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func RegisterRemoteSignerMsg(cdc *amino.Codec) {
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cdc.RegisterInterface((*RemoteSignerMsg)(nil), nil)
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cdc.RegisterConcrete(&PubKeyRequest{}, "tendermint/remotesigner/PubKeyRequest", nil)
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cdc.RegisterConcrete(&PubKeyResponse{}, "tendermint/remotesigner/PubKeyResponse", nil)
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cdc.RegisterConcrete(&SignVoteRequest{}, "tendermint/remotesigner/SignVoteRequest", nil)
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cdc.RegisterConcrete(&SignedVoteResponse{}, "tendermint/remotesigner/SignedVoteResponse", nil)
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cdc.RegisterConcrete(&SignProposalRequest{}, "tendermint/remotesigner/SignProposalRequest", nil)
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cdc.RegisterConcrete(&SignedProposalResponse{}, "tendermint/remotesigner/SignedProposalResponse", nil)
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cdc.RegisterConcrete(&PingRequest{}, "tendermint/remotesigner/PingRequest", nil)
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cdc.RegisterConcrete(&PingResponse{}, "tendermint/remotesigner/PingResponse", nil)
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}
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// PubKeyRequest requests the consensus public key from the remote signer.
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type PubKeyRequest struct{}
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// PubKeyResponse is a PrivValidatorSocket message containing the public key.
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type PubKeyResponse struct {
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PubKey crypto.PubKey
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Error *RemoteSignerError
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}
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// SignVoteRequest is a PrivValidatorSocket message containing a vote.
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type SignVoteRequest struct {
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Vote *types.Vote
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}
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// SignedVoteResponse is a PrivValidatorSocket message containing a signed vote along with a potenial error message.
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type SignedVoteResponse struct {
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Vote *types.Vote
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Error *RemoteSignerError
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}
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// SignProposalRequest is a PrivValidatorSocket message containing a Proposal.
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type SignProposalRequest struct {
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Proposal *types.Proposal
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}
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type SignedProposalResponse struct {
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Proposal *types.Proposal
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Error *RemoteSignerError
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}
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// PingRequest is a PrivValidatorSocket message to keep the connection alive.
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type PingRequest struct {
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}
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type PingResponse struct {
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}
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// RemoteSignerError allows (remote) validators to include meaningful error descriptions in their reply.
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type RemoteSignerError struct {
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// TODO(ismail): create an enum of known errors
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Code int
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Description string
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}
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func (e *RemoteSignerError) Error() string {
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return fmt.Sprintf("RemoteSigner returned error #%d: %s", e.Code, e.Description)
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}
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func readMsg(r io.Reader) (msg RemoteSignerMsg, err error) {
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const maxRemoteSignerMsgSize = 1024 * 10
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_, err = cdc.UnmarshalBinaryLengthPrefixedReader(r, &msg, maxRemoteSignerMsgSize)
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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.MarshalBinaryLengthPrefixedWriter(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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func handleRequest(req RemoteSignerMsg, chainID string, privVal types.PrivValidator) (RemoteSignerMsg, error) {
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var res RemoteSignerMsg
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var err error
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switch r := req.(type) {
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case *PubKeyRequest:
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var p crypto.PubKey
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p = privVal.GetPubKey()
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res = &PubKeyResponse{p, nil}
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case *SignVoteRequest:
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err = privVal.SignVote(chainID, r.Vote)
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if err != nil {
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res = &SignedVoteResponse{nil, &RemoteSignerError{0, err.Error()}}
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} else {
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res = &SignedVoteResponse{r.Vote, nil}
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}
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case *SignProposalRequest:
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err = privVal.SignProposal(chainID, r.Proposal)
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if err != nil {
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res = &SignedProposalResponse{nil, &RemoteSignerError{0, err.Error()}}
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} else {
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res = &SignedProposalResponse{r.Proposal, nil}
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}
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case *PingRequest:
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res = &PingResponse{}
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default:
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err = fmt.Errorf("unknown msg: %v", r)
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}
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return res, err
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}
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