-
Notifications
You must be signed in to change notification settings - Fork 2.1k
/
remote_signer.go
275 lines (232 loc) · 6.99 KB
/
remote_signer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
package privval
import (
"fmt"
"io"
"net"
"github.com/pkg/errors"
amino "github.com/tendermint/go-amino"
"github.com/tendermint/tendermint/crypto"
cmn "github.com/tendermint/tendermint/libs/common"
"github.com/tendermint/tendermint/types"
)
// Socket errors.
var (
ErrConnTimeout = errors.New("remote signer timed out")
)
// RemoteSignerClient implements PrivValidator.
// It uses a net.Conn to request signatures
// from an external process.
type RemoteSignerClient struct {
conn net.Conn
// memoized
consensusPubKey crypto.PubKey
}
// Check that RemoteSignerClient implements PrivValidator.
var _ types.PrivValidator = (*RemoteSignerClient)(nil)
// NewRemoteSignerClient returns an instance of RemoteSignerClient.
func NewRemoteSignerClient(conn net.Conn) (*RemoteSignerClient, error) {
// retrieve and memoize the consensus public key once.
pubKey, err := getPubKey(conn)
if err != nil {
return nil, cmn.ErrorWrap(err, "error while retrieving public key for remote signer")
}
return &RemoteSignerClient{
conn: conn,
consensusPubKey: pubKey,
}, nil
}
// Close calls Close on the underlying net.Conn.
func (sc *RemoteSignerClient) Close() error {
return sc.conn.Close()
}
// GetPubKey implements PrivValidator.
func (sc *RemoteSignerClient) GetPubKey() crypto.PubKey {
return sc.consensusPubKey
}
// not thread-safe (only called on startup).
func getPubKey(conn net.Conn) (crypto.PubKey, error) {
err := writeMsg(conn, &PubKeyRequest{})
if err != nil {
return nil, err
}
res, err := readMsg(conn)
if err != nil {
return nil, err
}
pubKeyResp, ok := res.(*PubKeyResponse)
if !ok {
return nil, errors.Wrap(ErrUnexpectedResponse, "response is not PubKeyResponse")
}
if pubKeyResp.Error != nil {
return nil, errors.Wrap(pubKeyResp.Error, "failed to get private validator's public key")
}
return pubKeyResp.PubKey, nil
}
// SignVote implements PrivValidator.
func (sc *RemoteSignerClient) SignVote(chainID string, vote *types.Vote) error {
err := writeMsg(sc.conn, &SignVoteRequest{Vote: vote})
if err != nil {
return err
}
res, err := readMsg(sc.conn)
if err != nil {
return err
}
resp, ok := res.(*SignedVoteResponse)
if !ok {
return ErrUnexpectedResponse
}
if resp.Error != nil {
return resp.Error
}
*vote = *resp.Vote
return nil
}
// SignProposal implements PrivValidator.
func (sc *RemoteSignerClient) SignProposal(
chainID string,
proposal *types.Proposal,
) error {
err := writeMsg(sc.conn, &SignProposalRequest{Proposal: proposal})
if err != nil {
return err
}
res, err := readMsg(sc.conn)
if err != nil {
return err
}
resp, ok := res.(*SignedProposalResponse)
if !ok {
return ErrUnexpectedResponse
}
if resp.Error != nil {
return resp.Error
}
*proposal = *resp.Proposal
return nil
}
// Ping is used to check connection health.
func (sc *RemoteSignerClient) Ping() error {
err := writeMsg(sc.conn, &PingRequest{})
if err != nil {
return err
}
res, err := readMsg(sc.conn)
if err != nil {
return err
}
_, ok := res.(*PingResponse)
if !ok {
return ErrUnexpectedResponse
}
return nil
}
// RemoteSignerMsg is sent between RemoteSigner and the RemoteSigner client.
type RemoteSignerMsg interface{}
func RegisterRemoteSignerMsg(cdc *amino.Codec) {
cdc.RegisterInterface((*RemoteSignerMsg)(nil), nil)
cdc.RegisterConcrete(&PubKeyRequest{}, "tendermint/remotesigner/PubKeyRequest", nil)
cdc.RegisterConcrete(&PubKeyResponse{}, "tendermint/remotesigner/PubKeyResponse", nil)
cdc.RegisterConcrete(&SignVoteRequest{}, "tendermint/remotesigner/SignVoteRequest", nil)
cdc.RegisterConcrete(&SignedVoteResponse{}, "tendermint/remotesigner/SignedVoteResponse", nil)
cdc.RegisterConcrete(&SignProposalRequest{}, "tendermint/remotesigner/SignProposalRequest", nil)
cdc.RegisterConcrete(&SignedProposalResponse{}, "tendermint/remotesigner/SignedProposalResponse", nil)
cdc.RegisterConcrete(&PingRequest{}, "tendermint/remotesigner/PingRequest", nil)
cdc.RegisterConcrete(&PingResponse{}, "tendermint/remotesigner/PingResponse", nil)
}
// PubKeyRequest requests the consensus public key from the remote signer.
type PubKeyRequest struct{}
// PubKeyResponse is a PrivValidatorSocket message containing the public key.
type PubKeyResponse struct {
PubKey crypto.PubKey
Error *RemoteSignerError
}
// SignVoteRequest is a PrivValidatorSocket message containing a vote.
type SignVoteRequest struct {
Vote *types.Vote
}
// SignedVoteResponse is a PrivValidatorSocket message containing a signed vote along with a potenial error message.
type SignedVoteResponse struct {
Vote *types.Vote
Error *RemoteSignerError
}
// SignProposalRequest is a PrivValidatorSocket message containing a Proposal.
type SignProposalRequest struct {
Proposal *types.Proposal
}
type SignedProposalResponse struct {
Proposal *types.Proposal
Error *RemoteSignerError
}
// PingRequest is a PrivValidatorSocket message to keep the connection alive.
type PingRequest struct {
}
type PingResponse struct {
}
// RemoteSignerError allows (remote) validators to include meaningful error descriptions in their reply.
type RemoteSignerError struct {
// TODO(ismail): create an enum of known errors
Code int
Description string
}
func (e *RemoteSignerError) Error() string {
return fmt.Sprintf("RemoteSigner returned error #%d: %s", e.Code, e.Description)
}
func readMsg(r io.Reader) (msg RemoteSignerMsg, err error) {
const maxRemoteSignerMsgSize = 1024 * 10
_, err = cdc.UnmarshalBinaryLengthPrefixedReader(r, &msg, maxRemoteSignerMsgSize)
if _, ok := err.(timeoutError); ok {
err = cmn.ErrorWrap(ErrConnTimeout, err.Error())
}
return
}
func writeMsg(w io.Writer, msg interface{}) (err error) {
_, err = cdc.MarshalBinaryLengthPrefixedWriter(w, msg)
if _, ok := err.(timeoutError); ok {
err = cmn.ErrorWrap(ErrConnTimeout, err.Error())
}
return
}
func handleRequest(req RemoteSignerMsg, chainID string, privVal types.PrivValidator) (RemoteSignerMsg, error) {
var res RemoteSignerMsg
var err error
switch r := req.(type) {
case *PubKeyRequest:
var p crypto.PubKey
p = privVal.GetPubKey()
res = &PubKeyResponse{p, nil}
case *SignVoteRequest:
err = privVal.SignVote(chainID, r.Vote)
if err != nil {
res = &SignedVoteResponse{nil, &RemoteSignerError{0, err.Error()}}
} else {
res = &SignedVoteResponse{r.Vote, nil}
}
case *SignProposalRequest:
err = privVal.SignProposal(chainID, r.Proposal)
if err != nil {
res = &SignedProposalResponse{nil, &RemoteSignerError{0, err.Error()}}
} else {
res = &SignedProposalResponse{r.Proposal, nil}
}
case *PingRequest:
res = &PingResponse{}
default:
err = fmt.Errorf("unknown msg: %v", r)
}
return res, err
}
// IsConnTimeout returns a boolean indicating whether the error is known to
// report that a connection timeout occurred. This detects both fundamental
// network timeouts, as well as ErrConnTimeout errors.
func IsConnTimeout(err error) bool {
if cmnErr, ok := err.(cmn.Error); ok {
if cmnErr.Data() == ErrConnTimeout {
return true
}
}
if _, ok := err.(timeoutError); ok {
return true
}
return false
}