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lnrpc: add macaroon_root_key to InitWalletRequest

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This adds a field for specifying the macaroon root key to use during the
wallet initialization process instead of having lnd generate a random
macaroon root key itself.
This commit is contained in:
Daniel McNally 2022-04-25 00:47:27 -04:00
parent a1cd7734d8
commit 86e5f9d0db
No known key found for this signature in database
GPG Key ID: BC19D851B2FC3A00
4 changed files with 124 additions and 77 deletions
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169
lnrpc/walletunlocker.pb.go
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@ -219,6 +219,11 @@ type InitWalletRequest struct {
//any of the keys and _needs_ to be run with a remote signer that has the //any of the keys and _needs_ to be run with a remote signer that has the
//corresponding private keys and can serve signing RPC requests. //corresponding private keys and can serve signing RPC requests.
WatchOnly *WatchOnly `protobuf:"bytes,9,opt,name=watch_only,json=watchOnly,proto3" json:"watch_only,omitempty"` WatchOnly *WatchOnly `protobuf:"bytes,9,opt,name=watch_only,json=watchOnly,proto3" json:"watch_only,omitempty"`
//
//macaroon_root_key is an optional 32 byte macaroon root key that can be
//provided when initializing the wallet rather than letting lnd generate one
//on its own.
MacaroonRootKey []byte `protobuf:"bytes,10,opt,name=macaroon_root_key,json=macaroonRootKey,proto3" json:"macaroon_root_key,omitempty"`
} }
func (x *InitWalletRequest) Reset() { func (x *InitWalletRequest) Reset() {
@ -316,6 +321,13 @@ func (x *InitWalletRequest) GetWatchOnly() *WatchOnly {
return nil return nil
} }
func (x *InitWalletRequest) GetMacaroonRootKey() []byte {
if x != nil {
return x.MacaroonRootKey
}
return nil
}
type InitWalletResponse struct { type InitWalletResponse struct {
state protoimpl.MessageState state protoimpl.MessageState
sizeCache protoimpl.SizeCache sizeCache protoimpl.SizeCache
@ -822,8 +834,8 @@ var file_walletunlocker_proto_rawDesc = []byte{
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@ -853,82 +865,85 @@ var file_walletunlocker_proto_rawDesc = []byte{
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} }
var ( var (

7
lnrpc/walletunlocker.proto
View File

@ -185,6 +185,13 @@ message InitWalletRequest {
corresponding private keys and can serve signing RPC requests. corresponding private keys and can serve signing RPC requests.
*/ */
WatchOnly watch_only = 9; WatchOnly watch_only = 9;
/*
macaroon_root_key is an optional 32 byte macaroon root key that can be
provided when initializing the wallet rather than letting lnd generate one
on its own.
*/
bytes macaroon_root_key = 10;
} }
message InitWalletResponse { message InitWalletResponse {
/* /*

5
lnrpc/walletunlocker.swagger.json
View File

@ -313,6 +313,11 @@
"watch_only": { "watch_only": {
"$ref": "#/definitions/lnrpcWatchOnly", "$ref": "#/definitions/lnrpcWatchOnly",
"description": "watch_only is the third option of initializing a wallet: by importing\naccount xpubs only and therefore creating a watch-only wallet that does not\ncontain any private keys. That means the wallet won't be able to sign for\nany of the keys and _needs_ to be run with a remote signer that has the\ncorresponding private keys and can serve signing RPC requests." "description": "watch_only is the third option of initializing a wallet: by importing\naccount xpubs only and therefore creating a watch-only wallet that does not\ncontain any private keys. That means the wallet won't be able to sign for\nany of the keys and _needs_ to be run with a remote signer that has the\ncorresponding private keys and can serve signing RPC requests."
},
"macaroon_root_key": {
"type": "string",
"format": "byte",
"description": "macaroon_root_key is an optional 32 byte macaroon root key that can be\nprovided when initializing the wallet rather than letting lnd generate one\non its own."
} }
} }
}, },

20
walletunlocker/service.go
View File

@ -65,6 +65,10 @@ type WalletUnlockParams struct {
// MacResponseChan is the channel for sending back the admin macaroon to // MacResponseChan is the channel for sending back the admin macaroon to
// the WalletUnlocker service. // the WalletUnlocker service.
MacResponseChan chan []byte MacResponseChan chan []byte
// MacRootKey is the 32 byte macaroon root key specified by the user
// during wallet initialization.
MacRootKey []byte
} }
// ChannelsToRecover wraps any set of packed (serialized+encrypted) channel // ChannelsToRecover wraps any set of packed (serialized+encrypted) channel
@ -130,6 +134,10 @@ type WalletInitMsg struct {
// initialized stateless, which means no unencrypted macaroons should be // initialized stateless, which means no unencrypted macaroons should be
// written to disk. // written to disk.
StatelessInit bool StatelessInit bool
// MacRootKey is the 32 byte macaroon root key specified by the user
// during wallet initialization.
MacRootKey []byte
} }
// WalletUnlockMsg is a message sent by the UnlockerService when a user wishes // WalletUnlockMsg is a message sent by the UnlockerService when a user wishes
@ -398,6 +406,17 @@ func (u *UnlockerService) InitWallet(ctx context.Context,
"non-negative", recoveryWindow) "non-negative", recoveryWindow)
} }
// Ensure that the macaroon root key is *exactly* 32-bytes.
macaroonRootKey := in.MacaroonRootKey
if len(macaroonRootKey) > 0 &&
len(macaroonRootKey) != macaroons.RootKeyLen {
return nil, fmt.Errorf("macaroon root key must be exactly "+
"%v bytes, is instead %v",
macaroons.RootKeyLen, len(macaroonRootKey),
)
}
// We'll then open up the directory that will be used to store the // We'll then open up the directory that will be used to store the
// wallet's files so we can check if the wallet already exists. // wallet's files so we can check if the wallet already exists.
loader, err := u.newLoader(uint32(recoveryWindow)) loader, err := u.newLoader(uint32(recoveryWindow))
@ -422,6 +441,7 @@ func (u *UnlockerService) InitWallet(ctx context.Context,
Passphrase: password, Passphrase: password,
RecoveryWindow: uint32(recoveryWindow), RecoveryWindow: uint32(recoveryWindow),
StatelessInit: in.StatelessInit, StatelessInit: in.StatelessInit,
MacRootKey: macaroonRootKey,
} }
// There are two supported ways to initialize the wallet. Either from // There are two supported ways to initialize the wallet. Either from