mirror of https://github.com/lightninglabs/loop
loopd: add macaroon authentication to the daemon's server connection
To secure access to loop's RPC server, we add a macaroon authentication service and its gRPC interceptors to the daemon's server connection.pull/281/head
Oliver Gugger
4 years ago
parent
ff17553f3b
commit
751c70e6c7
@ -0,0 +1,192 @@
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package loopd
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import (
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/macaroons"
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"google.golang.org/grpc"
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"gopkg.in/macaroon-bakery.v2/bakery"
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)
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const (
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// loopMacaroonLocation is the value we use for the loopd macaroons'
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// "Location" field when baking them.
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loopMacaroonLocation = "loop"
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)
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var (
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// RequiredPermissions is a map of all loop RPC methods and their
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// required macaroon permissions to access loopd.
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RequiredPermissions = map[string][]bakery.Op{
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"/looprpc.SwapClient/LoopOut": {{
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Entity: "swap",
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Action: "execute",
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}, {
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Entity: "loop",
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Action: "out",
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}},
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"/looprpc.SwapClient/LoopIn": {{
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Entity: "swap",
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Action: "execute",
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}, {
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Entity: "loop",
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Action: "in",
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}},
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"/looprpc.SwapClient/Monitor": {{
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Entity: "swap",
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Action: "read",
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}},
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"/looprpc.SwapClient/ListSwaps": {{
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Entity: "swap",
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Action: "read",
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}},
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"/looprpc.SwapClient/SwapInfo": {{
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Entity: "swap",
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Action: "read",
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}},
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"/looprpc.SwapClient/LoopOutTerms": {{
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Entity: "terms",
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Action: "read",
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}, {
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Entity: "loop",
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Action: "out",
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}},
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"/looprpc.SwapClient/LoopOutQuote": {{
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Entity: "swap",
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Action: "read",
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}, {
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Entity: "loop",
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Action: "out",
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}},
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"/looprpc.SwapClient/GetLoopInTerms": {{
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Entity: "terms",
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Action: "read",
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}, {
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Entity: "loop",
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Action: "in",
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}},
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"/looprpc.SwapClient/GetLoopInQuote": {{
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Entity: "swap",
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Action: "read",
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}, {
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Entity: "loop",
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Action: "in",
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}},
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"/looprpc.SwapClient/GetLsatTokens": {{
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Entity: "auth",
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Action: "read",
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}},
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}
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// allPermissions is the list of all existing permissions that exist
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// for loopd's RPC. The default macaroon that is created on startup
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// contains all these permissions and is therefore equivalent to lnd's
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// admin.macaroon but for loop.
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allPermissions = []bakery.Op{{
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Entity: "loop",
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Action: "out",
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}, {
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Entity: "loop",
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Action: "in",
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}, {
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Entity: "swap",
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Action: "execute",
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}, {
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Entity: "swap",
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Action: "read",
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}, {
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Entity: "terms",
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Action: "read",
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}, {
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Entity: "auth",
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Action: "read",
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}}
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// macDbDefaultPw is the default encryption password used to encrypt the
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// loop macaroon database. The macaroon service requires us to set a
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// non-nil password so we set it to an empty string. This will cause the
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// keys to be encrypted on disk but won't provide any security at all as
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// the password is known to anyone.
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//
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// TODO(guggero): Allow the password to be specified by the user. Needs
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// create/unlock calls in the RPC. Using a password should be optional
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// though.
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macDbDefaultPw = []byte("")
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)
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// startMacaroonService starts the macaroon validation service, creates or
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// unlocks the macaroon database and creates the default macaroon if it doesn't
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// exist yet. If macaroons are disabled in general in the configuration, none of
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// these actions are taken.
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func (d *Daemon) startMacaroonService() error {
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// Create the macaroon authentication/authorization service.
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var err error
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d.macaroonService, err = macaroons.NewService(
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d.cfg.DataDir, loopMacaroonLocation, macaroons.IPLockChecker,
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)
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if err != nil {
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return fmt.Errorf("unable to set up macaroon authentication: "+
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"%v", err)
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}
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// Try to unlock the macaroon store with the private password.
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err = d.macaroonService.CreateUnlock(&macDbDefaultPw)
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if err != nil {
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return fmt.Errorf("unable to unlock macaroon DB: %v", err)
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}
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// Create macaroon files for loop CLI to use if they don't exist.
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if !lnrpc.FileExists(d.cfg.MacaroonPath) {
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ctx := context.Background()
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// We only generate one default macaroon that contains all
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// existing permissions (equivalent to the admin.macaroon in
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// lnd). Custom macaroons can be created through the bakery
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// RPC.
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loopMac, err := d.macaroonService.NewMacaroon(
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ctx, macaroons.DefaultRootKeyID,
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allPermissions...,
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)
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if err != nil {
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return err
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}
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loopMacBytes, err := loopMac.M().MarshalBinary()
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(d.cfg.MacaroonPath, loopMacBytes, 0644)
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if err != nil {
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if err := os.Remove(d.cfg.MacaroonPath); err != nil {
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log.Errorf("Unable to remove %s: %v",
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d.cfg.MacaroonPath, err)
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}
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return err
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}
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}
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return nil
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}
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// stopMacaroonService closes the macaroon database.
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func (d *Daemon) stopMacaroonService() error {
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return d.macaroonService.Close()
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}
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// macaroonInterceptor creates gRPC server options with the macaroon security
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// interceptors.
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func (d *Daemon) macaroonInterceptor() []grpc.ServerOption {
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unaryInterceptor := d.macaroonService.UnaryServerInterceptor(
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RequiredPermissions,
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)
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streamInterceptor := d.macaroonService.StreamServerInterceptor(
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RequiredPermissions,
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)
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return []grpc.ServerOption{
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grpc.UnaryInterceptor(unaryInterceptor),
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grpc.StreamInterceptor(streamInterceptor),
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}
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}
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