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accounts, eth, clique, signer: support for external signer API (#18079)

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* accounts, eth, clique: implement external backend + move sighash calc to backend

* signer: implement account_Version on external API

* accounts/external: enable ipc, add copyright

* accounts, internal, signer: formatting

* node: go fmt

* flags: disallow --dev in combo with --externalsigner

* accounts: remove clique-specific signing method, replace with more generic

* accounts, consensus: formatting + fix error in tests

* signer/core: remove (test-) import cycle

* clique: remove unused import

* accounts: remove CliqueHash and avoid dependency on package crypto

* consensus/clique: unduplicate header encoding
This commit is contained in:
Martin Holst Swende
2019-02-05 11:23:57 +01:00
committed by GitHub
parent 520024dfd6
commit 43e8efe895
17 changed files with 460 additions and 117 deletions
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37
accounts/accounts.go
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@ -18,12 +18,14 @@
package accounts
import (
"fmt"
"math/big"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"golang.org/x/crypto/sha3"
)
// Account represents an Ethereum account located at a specific location defined
@ -87,8 +89,7 @@ type Wallet interface {
// chain state reader.
SelfDerive(base DerivationPath, chain ethereum.ChainStateReader)
// SignHash requests the wallet to sign the given hash.
//
// SignData requests the wallet to sign the hash of the given data
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
@ -98,7 +99,20 @@ type Wallet interface {
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignHash(account Account, hash []byte) ([]byte, error)
SignData(account Account, mimeType string, data []byte) ([]byte, error)
// Signtext requests the wallet to sign the hash of a given piece of data, prefixed
// by the Ethereum prefix scheme
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
// If the wallet requires additional authentication to sign the request (e.g.
// a password to decrypt the account, or a PIN code o verify the transaction),
// an AuthNeededError instance will be returned, containing infos for the user
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignText(account Account, text []byte) ([]byte, error)
// SignTx requests the wallet to sign the given transaction.
//
@ -113,12 +127,12 @@ type Wallet interface {
// the account in a keystore).
SignTx(account Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error)
// SignHashWithPassphrase requests the wallet to sign the given hash with the
// SignTextWithPassphrase requests the wallet to sign the given text with the
// given passphrase as extra authentication information.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
SignHashWithPassphrase(account Account, passphrase string, hash []byte) ([]byte, error)
SignTextWithPassphrase(account Account, passphrase string, hash []byte) ([]byte, error)
// SignTxWithPassphrase requests the wallet to sign the given transaction, with the
// given passphrase as extra authentication information.
@ -148,6 +162,19 @@ type Backend interface {
Subscribe(sink chan<- WalletEvent) event.Subscription
}
// TextHash is a helper function that calculates a hash for the given message that can be
// safely used to calculate a signature from.
//
// The hash is calulcated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func TextHash(data []byte) []byte {
hash := sha3.NewLegacyKeccak256()
fmt.Fprintf(hash, "\x19Ethereum Signed Message:\n%d%s", len(data), data)
return hash.Sum(nil)
}
// WalletEventType represents the different event types that can be fired by
// the wallet subscription subsystem.
type WalletEventType int