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ledger.go
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ledger.go
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package ledgerwallet
import (
"bytes"
"context"
"encoding/json"
"fmt"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-datastore"
"github.com/ipfs/go-datastore/query"
logging "github.com/ipfs/go-log"
ledgerfil "github.com/whyrusleeping/ledger-filecoin-go"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/node/modules/dtypes"
)
var log = logging.Logger("wallet-ledger")
type LedgerWallet struct {
ds datastore.Datastore
}
func NewWallet(ds dtypes.MetadataDS) *LedgerWallet {
return &LedgerWallet{ds}
}
type LedgerKeyInfo struct {
Address address.Address
Path []uint32
}
var _ api.WalletAPI = (*LedgerWallet)(nil)
func (lw LedgerWallet) WalletSign(ctx context.Context, signer address.Address, toSign []byte, meta api.MsgMeta) (*crypto.Signature, error) {
ki, err := lw.getKeyInfo(signer)
if err != nil {
return nil, err
}
fl, err := ledgerfil.FindLedgerFilecoinApp()
if err != nil {
return nil, err
}
defer fl.Close() // nolint:errcheck
if meta.Type != api.MTChainMsg {
return nil, fmt.Errorf("ledger can only sign chain messages")
}
{
var cmsg types.Message
if err := cmsg.UnmarshalCBOR(bytes.NewReader(meta.Extra)); err != nil {
return nil, xerrors.Errorf("unmarshalling message: %w", err)
}
_, bc, err := cid.CidFromBytes(toSign)
if err != nil {
return nil, xerrors.Errorf("getting cid from signing bytes: %w", err)
}
if !cmsg.Cid().Equals(bc) {
return nil, xerrors.Errorf("cid(meta.Extra).bytes() != toSign")
}
}
sig, err := fl.SignSECP256K1(ki.Path, meta.Extra)
if err != nil {
return nil, err
}
return &crypto.Signature{
Type: crypto.SigTypeSecp256k1,
Data: sig.SignatureBytes(),
}, nil
}
func (lw LedgerWallet) getKeyInfo(addr address.Address) (*LedgerKeyInfo, error) {
kib, err := lw.ds.Get(keyForAddr(addr))
if err != nil {
return nil, err
}
var out LedgerKeyInfo
if err := json.Unmarshal(kib, &out); err != nil {
return nil, xerrors.Errorf("unmarshalling ledger key info: %w", err)
}
return &out, nil
}
func (lw LedgerWallet) WalletDelete(ctx context.Context, k address.Address) error {
return lw.ds.Delete(keyForAddr(k))
}
func (lw LedgerWallet) WalletExport(ctx context.Context, k address.Address) (*types.KeyInfo, error) {
return nil, fmt.Errorf("cannot export keys from ledger wallets")
}
func (lw LedgerWallet) WalletHas(ctx context.Context, k address.Address) (bool, error) {
_, err := lw.ds.Get(keyForAddr(k))
if err == nil {
return true, nil
}
if err == datastore.ErrNotFound {
return false, nil
}
return false, err
}
func (lw LedgerWallet) WalletImport(ctx context.Context, kinfo *types.KeyInfo) (address.Address, error) {
var ki LedgerKeyInfo
if err := json.Unmarshal(kinfo.PrivateKey, &ki); err != nil {
return address.Undef, err
}
return lw.importKey(ki)
}
func (lw LedgerWallet) importKey(ki LedgerKeyInfo) (address.Address, error) {
if ki.Address == address.Undef {
return address.Undef, fmt.Errorf("no address given in imported key info")
}
if len(ki.Path) != filHdPathLen {
return address.Undef, fmt.Errorf("bad hd path len: %d, expected: %d", len(ki.Path), filHdPathLen)
}
bb, err := json.Marshal(ki)
if err != nil {
return address.Undef, xerrors.Errorf("marshaling key info: %w", err)
}
if err := lw.ds.Put(keyForAddr(ki.Address), bb); err != nil {
return address.Undef, err
}
return ki.Address, nil
}
func (lw LedgerWallet) WalletList(ctx context.Context) ([]address.Address, error) {
res, err := lw.ds.Query(query.Query{Prefix: dsLedgerPrefix})
if err != nil {
return nil, err
}
defer res.Close() // nolint:errcheck
var out []address.Address
for {
res, ok := res.NextSync()
if !ok {
break
}
var ki LedgerKeyInfo
if err := json.Unmarshal(res.Value, &ki); err != nil {
return nil, err
}
out = append(out, ki.Address)
}
return out, nil
}
const hdHard = 0x80000000
var filHDBasePath = []uint32{hdHard | 44, hdHard | 461, hdHard, 0}
var filHdPathLen = 5
func (lw LedgerWallet) WalletNew(ctx context.Context, t types.KeyType) (address.Address, error) {
if t != types.KTSecp256k1Ledger {
return address.Undef, fmt.Errorf("unsupported key type: '%s', only '%s' supported",
t, types.KTSecp256k1Ledger)
}
res, err := lw.ds.Query(query.Query{Prefix: dsLedgerPrefix})
if err != nil {
return address.Undef, err
}
defer res.Close() // nolint:errcheck
var maxi int64 = -1
for {
res, ok := res.NextSync()
if !ok {
break
}
var ki LedgerKeyInfo
if err := json.Unmarshal(res.Value, &ki); err != nil {
return address.Undef, err
}
if i := ki.Path[filHdPathLen-1]; maxi == -1 || maxi < int64(i) {
maxi = int64(i)
}
}
fl, err := ledgerfil.FindLedgerFilecoinApp()
if err != nil {
return address.Undef, xerrors.Errorf("finding ledger: %w", err)
}
defer fl.Close() // nolint:errcheck
path := append(append([]uint32(nil), filHDBasePath...), uint32(maxi+1))
_, _, addr, err := fl.GetAddressPubKeySECP256K1(path)
if err != nil {
return address.Undef, xerrors.Errorf("getting public key from ledger: %w", err)
}
log.Warnf("creating key: %s, accept the key in ledger device", addr)
_, _, addr, err = fl.ShowAddressPubKeySECP256K1(path)
if err != nil {
return address.Undef, xerrors.Errorf("verifying public key with ledger: %w", err)
}
a, err := address.NewFromString(addr)
if err != nil {
return address.Undef, fmt.Errorf("parsing address: %w", err)
}
var lki LedgerKeyInfo
lki.Address = a
lki.Path = path
return lw.importKey(lki)
}
func (lw *LedgerWallet) Get() api.WalletAPI {
if lw == nil {
return nil
}
return lw
}
var dsLedgerPrefix = "/ledgerkey/"
func keyForAddr(addr address.Address) datastore.Key {
return datastore.NewKey(dsLedgerPrefix + addr.String())
}