From 86e5f9d0db270bc4bd5951ebc0d48f994c79a87f Mon Sep 17 00:00:00 2001 From: Daniel McNally Date: Mon, 25 Apr 2022 00:47:27 -0400 Subject: [PATCH] lnrpc: add macaroon_root_key to InitWalletRequest 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. --- lnrpc/walletunlocker.pb.go | 169 ++++++++++++++++-------------- lnrpc/walletunlocker.proto | 7 ++ lnrpc/walletunlocker.swagger.json | 5 + walletunlocker/service.go | 20 ++++ 4 files changed, 124 insertions(+), 77 deletions(-) diff --git a/lnrpc/walletunlocker.pb.go b/lnrpc/walletunlocker.pb.go index 07c169e4f..30aa7aeb2 100644 --- a/lnrpc/walletunlocker.pb.go +++ b/lnrpc/walletunlocker.pb.go @@ -219,6 +219,11 @@ type InitWalletRequest struct { //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. 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() { @@ -316,6 +321,13 @@ func (x *InitWalletRequest) GetWatchOnly() *WatchOnly { return nil } +func (x *InitWalletRequest) GetMacaroonRootKey() []byte { + if x != nil { + return x.MacaroonRootKey + } + return nil +} + type InitWalletResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -822,8 +834,8 @@ var file_walletunlocker_proto_rawDesc = []byte{ 0x09, 0x52, 0x12, 0x63, 0x69, 0x70, 0x68, 0x65, 0x72, 0x53, 0x65, 0x65, 0x64, 0x4d, 0x6e, 0x65, 0x6d, 0x6f, 0x6e, 0x69, 0x63, 0x12, 0x27, 0x0a, 0x0f, 0x65, 0x6e, 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b/lnrpc/walletunlocker.swagger.json @@ -313,6 +313,11 @@ "watch_only": { "$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." + }, + "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." } } }, diff --git a/walletunlocker/service.go b/walletunlocker/service.go index 157ef086d..6d58b0478 100644 --- a/walletunlocker/service.go +++ b/walletunlocker/service.go @@ -65,6 +65,10 @@ type WalletUnlockParams struct { // MacResponseChan is the channel for sending back the admin macaroon to // the WalletUnlocker service. 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 @@ -130,6 +134,10 @@ type WalletInitMsg struct { // initialized stateless, which means no unencrypted macaroons should be // written to disk. 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 @@ -398,6 +406,17 @@ func (u *UnlockerService) InitWallet(ctx context.Context, "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 // wallet's files so we can check if the wallet already exists. loader, err := u.newLoader(uint32(recoveryWindow)) @@ -422,6 +441,7 @@ func (u *UnlockerService) InitWallet(ctx context.Context, Passphrase: password, RecoveryWindow: uint32(recoveryWindow), StatelessInit: in.StatelessInit, + MacRootKey: macaroonRootKey, } // There are two supported ways to initialize the wallet. Either from