From 66258ee7b59aec1c43f7371724ca044aab255606 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:16:55 +0200 Subject: [PATCH 1/9] lnrpc: enable RPC middleware in REST WebSockets If we don't flag the /v1/middleware call as request streaming, it can't be used properly with REST WebSockets because the proxy would close the connection after the first request message. --- lnrpc/metadata.go | 1 + 1 file changed, 1 insertion(+) diff --git a/lnrpc/metadata.go b/lnrpc/metadata.go index a8c1f57a5..a6e89949b 100644 --- a/lnrpc/metadata.go +++ b/lnrpc/metadata.go @@ -13,6 +13,7 @@ var ( regexp.MustCompile("^/v1/channels/acceptor$"), regexp.MustCompile("^/v1/channels/transaction-stream$"), regexp.MustCompile("^/v2/router/htlcinterceptor$"), + regexp.MustCompile("^/v1/middleware$"), } // MaxGrpcMsgSize is used when we configure both server and clients to From dc32ca61f89dc89ebea0393c3b1083ee79439237 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:16:56 +0200 Subject: [PATCH 2/9] rpcperms: add replaceProtoMsg Because of the way the gRPC Receive() method is designed, we need a way to replace a proto message with the content of another one without replacing the original instance itself (e.g. overwrite all values in the existing struct instance). --- rpcperms/middleware_handler.go | 26 +++++++++ rpcperms/middleware_handler_test.go | 90 +++++++++++++++++++++++++++++ 2 files changed, 116 insertions(+) create mode 100644 rpcperms/middleware_handler_test.go diff --git a/rpcperms/middleware_handler.go b/rpcperms/middleware_handler.go index 4663bec8a..0a890d2c3 100644 --- a/rpcperms/middleware_handler.go +++ b/rpcperms/middleware_handler.go @@ -529,3 +529,29 @@ func parseProto(typeName string, serialized []byte) (proto.Message, error) { return msg.Interface(), nil } + +// replaceProtoMsg replaces the given target message with the content of the +// replacement message. +func replaceProtoMsg(target interface{}, replacement interface{}) error { + targetMsg, ok := target.(proto.Message) + if !ok { + return fmt.Errorf("target is not a proto message: %v", target) + } + + replacementMsg, ok := replacement.(proto.Message) + if !ok { + return fmt.Errorf("replacement is not a proto message: %v", + replacement) + } + + if targetMsg.ProtoReflect().Type() != + replacementMsg.ProtoReflect().Type() { + + return fmt.Errorf("replacement message is of wrong type") + } + + proto.Reset(targetMsg) + proto.Merge(targetMsg, replacementMsg) + + return nil +} diff --git a/rpcperms/middleware_handler_test.go b/rpcperms/middleware_handler_test.go new file mode 100644 index 000000000..aa8715bf0 --- /dev/null +++ b/rpcperms/middleware_handler_test.go @@ -0,0 +1,90 @@ +package rpcperms + +import ( + "encoding/json" + "testing" + + "github.com/lightningnetwork/lnd/lnrpc" + "github.com/stretchr/testify/require" +) + +// TestReplaceProtoMsg makes sure the proto message replacement works as +// expected. +func TestReplaceProtoMsg(t *testing.T) { + testCases := []struct { + name string + original interface{} + replacement interface{} + expectedErr string + }{{ + name: "simple content replacement", + original: &lnrpc.Invoice{ + Memo: "This is a memo string", + Value: 123456, + }, + replacement: &lnrpc.Invoice{ + Memo: "This is the replaced string", + Value: 654321, + }, + }, { + name: "replace with empty message", + original: &lnrpc.Invoice{ + Memo: "This is a memo string", + Value: 123456, + }, + replacement: &lnrpc.Invoice{}, + }, { + name: "replace with fewer fields", + original: &lnrpc.Invoice{ + Memo: "This is a memo string", + Value: 123456, + }, + replacement: &lnrpc.Invoice{ + Value: 654321, + }, + }, { + name: "wrong replacement type", + original: &lnrpc.Invoice{ + Memo: "This is a memo string", + Value: 123456, + }, + replacement: &lnrpc.AddInvoiceResponse{}, + expectedErr: "replacement message is of wrong type", + }, { + name: "wrong original type", + original: &interceptRequest{}, + replacement: &lnrpc.Invoice{ + Memo: "This is the replaced string", + Value: 654321, + }, + expectedErr: "target is not a proto message", + }} + + for _, tc := range testCases { + t.Run(tc.name, func(tt *testing.T) { + err := replaceProtoMsg(tc.original, tc.replacement) + + if tc.expectedErr != "" { + require.Error(tt, err) + require.Contains( + tt, err.Error(), tc.expectedErr, + ) + + return + } + + require.NoError(tt, err) + jsonEqual(tt, tc.replacement, tc.original) + }) + } +} + +func jsonEqual(t *testing.T, expected, actual interface{}) { + expectedJSON, err := json.Marshal(expected) + require.NoError(t, err) + + actualJSON, err := json.Marshal(actual) + require.NoError(t, err) + + require.JSONEq(t, string(expectedJSON), string(actualJSON)) +} From 86c64abfe63cf77a992016066e54d59317fc790a Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:16:57 +0200 Subject: [PATCH 3/9] rpcperms: allow requests to be replaced as well With this commit we allow a replacement message to be sent by the middleware for a request type as well as the response type. This allows an incoming RPC request to be modified before it is forwarded to lnd. --- rpcperms/interceptor.go | 53 +++++++++++++++++----------------- rpcperms/middleware_handler.go | 9 +++--- 2 files changed, 30 insertions(+), 32 deletions(-) diff --git a/rpcperms/interceptor.go b/rpcperms/interceptor.go index 861d94b51..c5ebc24bb 100644 --- a/rpcperms/interceptor.go +++ b/rpcperms/interceptor.go @@ -118,7 +118,7 @@ var ( // | Macaroon Interceptor | // +----------------------------------+--------> +---------------------+ // | RPC Macaroon Middleware Handler |<-------- | External Middleware | -// +----------------------------------+ | - approve request | +// +----------------------------------+ | - modify request | // | Prometheus Interceptor | +---------------------+ // +-+--------------------------------+ // | validated gRPC request from client @@ -808,15 +808,11 @@ func (r *InterceptorChain) middlewareUnaryServerInterceptor() grpc.UnaryServerIn return handler(ctx, req) } - msg, err := NewMessageInterceptionRequest( - ctx, TypeRequest, false, info.FullMethod, req, - ) - if err != nil { - return nil, err - } - requestID := atomic.AddUint64(&r.lastRequestID, 1) - err = r.acceptRequest(requestID, msg) + req, err := r.interceptMessage( + ctx, TypeRequest, requestID, false, info.FullMethod, + req, + ) if err != nil { return nil, err } @@ -826,8 +822,9 @@ func (r *InterceptorChain) middlewareUnaryServerInterceptor() grpc.UnaryServerIn return resp, respErr } - return r.interceptResponse( - ctx, requestID, false, info.FullMethod, resp, + return r.interceptMessage( + ctx, TypeResponse, requestID, false, info.FullMethod, + resp, ) } } @@ -874,7 +871,7 @@ func (r *InterceptorChain) middlewareStreamServerInterceptor() grpc.StreamServer } requestID := atomic.AddUint64(&r.lastRequestID, 1) - err = r.acceptRequest(requestID, msg) + err = r.acceptStream(requestID, msg) if err != nil { return err } @@ -926,11 +923,11 @@ func (r *InterceptorChain) middlewareRegistered() bool { return len(r.registeredMiddleware) > 0 } -// acceptRequest sends an intercept request to all middlewares that have +// acceptStream sends an intercept request to all middlewares that have // registered for it. This means either a middleware has requested read-only // access or the request actually has a macaroon with a caveat the middleware // registered for. -func (r *InterceptorChain) acceptRequest(requestID uint64, +func (r *InterceptorChain) acceptStream(requestID uint64, msg *InterceptionRequest) error { r.RLock() @@ -967,13 +964,13 @@ func (r *InterceptorChain) acceptRequest(requestID uint64, return nil } -// interceptResponse sends out an intercept request for an RPC response. Since +// interceptMessage sends out an intercept request for an RPC response. Since // middleware that hasn't registered for the read-only mode has the option to -// overwrite/replace the response, this needs to be handled differently than the -// request/auth path above. -func (r *InterceptorChain) interceptResponse(ctx context.Context, - requestID uint64, isStream bool, fullMethod string, - m interface{}) (interface{}, error) { +// overwrite/replace the message, this needs to be handled differently than the +// auth path above. +func (r *InterceptorChain) interceptMessage(ctx context.Context, + interceptType InterceptType, requestID uint64, isStream bool, + fullMethod string, m interface{}) (interface{}, error) { r.RLock() defer r.RUnlock() @@ -981,7 +978,8 @@ func (r *InterceptorChain) interceptResponse(ctx context.Context, currentMessage := m for _, middleware := range r.registeredMiddleware { msg, err := NewMessageInterceptionRequest( - ctx, TypeResponse, isStream, fullMethod, currentMessage, + ctx, interceptType, isStream, fullMethod, + currentMessage, ) if err != nil { return nil, err @@ -1039,8 +1037,9 @@ type serverStreamWrapper struct { // SendMsg is called when lnd sends a message to the client. This is wrapped to // intercept streaming RPC responses. func (w *serverStreamWrapper) SendMsg(m interface{}) error { - newMsg, err := w.interceptor.interceptResponse( - w.ServerStream.Context(), w.requestID, true, w.fullMethod, m, + newMsg, err := w.interceptor.interceptMessage( + w.ServerStream.Context(), TypeResponse, w.requestID, true, + w.fullMethod, m, ) if err != nil { return err @@ -1057,13 +1056,13 @@ func (w *serverStreamWrapper) RecvMsg(m interface{}) error { return err } - msg, err := NewMessageInterceptionRequest( - w.ServerStream.Context(), TypeRequest, true, w.fullMethod, - m, + req, err := w.interceptor.interceptMessage( + w.ServerStream.Context(), TypeRequest, w.requestID, true, + w.fullMethod, m, ) if err != nil { return err } - return w.interceptor.acceptRequest(w.requestID, msg) + return replaceProtoMsg(m, req) } diff --git a/rpcperms/middleware_handler.go b/rpcperms/middleware_handler.go index 0a890d2c3..7ccad0b58 100644 --- a/rpcperms/middleware_handler.go +++ b/rpcperms/middleware_handler.go @@ -263,11 +263,9 @@ func (h *MiddlewareHandler) sendInterceptRequests(errChan chan error, break } - // For intercepted responses we also allow the + // For intercepted messages we also allow the // content itself to be overwritten. - if requestInfo.request.Type == TypeResponse && - t.ReplaceResponse { - + if t.ReplaceResponse { response.replace = true protoMsg, err := parseProto( requestInfo.request.ProtoTypeName, @@ -322,7 +320,8 @@ const ( // TypeRequest is the type of intercept message that is sent when an RPC // request message is sent to lnd. For client-streaming RPCs a new // message of this type is sent for each individual RPC request sent to - // the stream. + // the stream. Middleware has the option to modify a request message + // before it is delivered to lnd. TypeRequest InterceptType = 2 // TypeResponse is the type of intercept message that is sent when an From d604055ccceea6d06ce673e29e998133000afbbe Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:16:58 +0200 Subject: [PATCH 4/9] lnrpc: describe request replacement in API docs This commit updates the comments in the proto file to mention the new behavior of also being able to replace request messages. --- lnrpc/lightning.pb.go | 10 ++++------ lnrpc/lightning.proto | 10 ++++------ lnrpc/lightning.swagger.json | 4 ++-- 3 files changed, 10 insertions(+), 14 deletions(-) diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go index 25e9e6222..a80f76b8e 100644 --- a/lnrpc/lightning.pb.go +++ b/lnrpc/lightning.pb.go @@ -16206,16 +16206,14 @@ type InterceptFeedback struct { //response and the processing of it can continue. Error string `protobuf:"bytes,1,opt,name=error,proto3" json:"error,omitempty"` // - //A boolean indicating that the gRPC response should be replaced/overwritten. - //As its name suggests, this can only be used as a feedback to an intercepted - //response RPC message and is ignored for feedback on any other message. This - //boolean is needed because in protobuf an empty message is serialized as a - //0-length or nil byte slice and we wouldn't be able to distinguish between + //A boolean indicating that the gRPC message should be replaced/overwritten. + //This boolean is needed because in protobuf an empty message is serialized as + //a 0-length or nil byte slice and we wouldn't be able to distinguish between //an empty replacement message and the "don't replace anything" case. ReplaceResponse bool `protobuf:"varint,2,opt,name=replace_response,json=replaceResponse,proto3" json:"replace_response,omitempty"` // //If the replace_response field is set to true, this field must contain the - //binary serialized gRPC response message in the protobuf format. + //binary serialized gRPC message in the protobuf format. ReplacementSerialized []byte `protobuf:"bytes,3,opt,name=replacement_serialized,json=replacementSerialized,proto3" json:"replacement_serialized,omitempty"` } diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto index e65e3f6eb..44b5b88e5 100644 --- a/lnrpc/lightning.proto +++ b/lnrpc/lightning.proto @@ -4501,18 +4501,16 @@ message InterceptFeedback { string error = 1; /* - A boolean indicating that the gRPC response should be replaced/overwritten. - As its name suggests, this can only be used as a feedback to an intercepted - response RPC message and is ignored for feedback on any other message. This - boolean is needed because in protobuf an empty message is serialized as a - 0-length or nil byte slice and we wouldn't be able to distinguish between + A boolean indicating that the gRPC message should be replaced/overwritten. + This boolean is needed because in protobuf an empty message is serialized as + a 0-length or nil byte slice and we wouldn't be able to distinguish between an empty replacement message and the "don't replace anything" case. */ bool replace_response = 2; /* If the replace_response field is set to true, this field must contain the - binary serialized gRPC response message in the protobuf format. + binary serialized gRPC message in the protobuf format. */ bytes replacement_serialized = 3; } diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json index 6fdd36bd1..0ff50ed16 100644 --- a/lnrpc/lightning.swagger.json +++ b/lnrpc/lightning.swagger.json @@ -4682,12 +4682,12 @@ }, "replace_response": { "type": "boolean", - "description": "A boolean indicating that the gRPC response should be replaced/overwritten.\nAs its name suggests, this can only be used as a feedback to an intercepted\nresponse RPC message and is ignored for feedback on any other message. This\nboolean is needed because in protobuf an empty message is serialized as a\n0-length or nil byte slice and we wouldn't be able to distinguish between\nan empty replacement message and the \"don't replace anything\" case." + "description": "A boolean indicating that the gRPC message should be replaced/overwritten.\nThis boolean is needed because in protobuf an empty message is serialized as\na 0-length or nil byte slice and we wouldn't be able to distinguish between\nan empty replacement message and the \"don't replace anything\" case." }, "replacement_serialized": { "type": "string", "format": "byte", - "description": "If the replace_response field is set to true, this field must contain the\nbinary serialized gRPC response message in the protobuf format." + "description": "If the replace_response field is set to true, this field must contain the\nbinary serialized gRPC message in the protobuf format." } } }, From 502542da60af328275b413ca647725282ed1d303 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:16:59 +0200 Subject: [PATCH 5/9] lnrpc: add is_error to intercept message --- lnrpc/lightning.pb.go | 935 ++++++++++++++++++----------------- lnrpc/lightning.proto | 10 +- lnrpc/lightning.swagger.json | 6 +- 3 files changed, 489 insertions(+), 462 deletions(-) diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go index a80f76b8e..e9ead2706 100644 --- a/lnrpc/lightning.pb.go +++ b/lnrpc/lightning.pb.go @@ -15935,12 +15935,18 @@ type RPCMessage struct { StreamRpc bool `protobuf:"varint,2,opt,name=stream_rpc,json=streamRpc,proto3" json:"stream_rpc,omitempty"` // //The full canonical gRPC name of the message type (in the format - //.TypeName, for example lnrpc.GetInfoRequest). + //.TypeName, for example lnrpc.GetInfoRequest). In case of an + //error being returned from lnd, this simply contains the string "error". TypeName string `protobuf:"bytes,3,opt,name=type_name,json=typeName,proto3" json:"type_name,omitempty"` // //The full content of the gRPC message, serialized in the binary protobuf //format. Serialized []byte `protobuf:"bytes,4,opt,name=serialized,proto3" json:"serialized,omitempty"` + // + //Indicates that the response from lnd was an error, not a gRPC response. If + //this is set to true then the type_name contains the string "error" and + //serialized contains the error string. + IsError bool `protobuf:"varint,5,opt,name=is_error,json=isError,proto3" json:"is_error,omitempty"` } func (x *RPCMessage) Reset() { @@ -16003,6 +16009,13 @@ func (x *RPCMessage) GetSerialized() []byte { return nil } +func (x *RPCMessage) GetIsError() bool { + if x != nil { + return x.IsError + } + return false +} + type RPCMiddlewareResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -19119,7 +19132,7 @@ var file_lightning_proto_rawDesc = []byte{ 0x22, 0x34, 0x0a, 0x0a, 0x53, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x41, 0x75, 0x74, 0x68, 0x12, 0x26, 0x0a, 0x0f, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x5f, 0x66, 0x75, 0x6c, 0x6c, 0x5f, 0x75, 0x72, 0x69, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x46, - 0x75, 0x6c, 0x6c, 0x55, 0x72, 0x69, 0x22, 0x90, 0x01, 0x0a, 0x0a, 0x52, 0x50, 0x43, 0x4d, 0x65, + 0x75, 0x6c, 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In case of an + error being returned from lnd, this simply contains the string "error". */ string type_name = 3; @@ -4425,6 +4426,13 @@ message RPCMessage { format. */ bytes serialized = 4; + + /* + Indicates that the response from lnd was an error, not a gRPC response. If + this is set to true then the type_name contains the string "error" and + serialized contains the error string. + */ + bool is_error = 5; } message RPCMiddlewareResponse { diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json index 0ff50ed16..29c60525d 100644 --- a/lnrpc/lightning.swagger.json +++ b/lnrpc/lightning.swagger.json @@ -5953,12 +5953,16 @@ }, "type_name": { "type": "string", - "description": "The full canonical gRPC name of the message type (in the format\n\u003crpcpackage\u003e.TypeName, for example lnrpc.GetInfoRequest)." + "description": "The full canonical gRPC name of the message type (in the format\n\u003crpcpackage\u003e.TypeName, for example lnrpc.GetInfoRequest). In case of an\nerror being returned from lnd, this simply contains the string \"error\"." }, "serialized": { "type": "string", "format": "byte", "description": "The full content of the gRPC message, serialized in the binary protobuf\nformat." + }, + "is_error": { + "type": "boolean", + "description": "Indicates that the response from lnd was an error, not a gRPC response. If\nthis is set to true then the type_name contains the string \"error\" and\nserialized contains the error string." } } }, From b1d8767a0ca0fcc662854c2850c93ea99b463925 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:17:00 +0200 Subject: [PATCH 6/9] rpcperms: intercept errors too --- rpcperms/interceptor.go | 43 ++++++++++++-- rpcperms/middleware_handler.go | 104 +++++++++++++++++++++++---------- 2 files changed, 110 insertions(+), 37 deletions(-) diff --git a/rpcperms/interceptor.go b/rpcperms/interceptor.go index c5ebc24bb..07ee4fccb 100644 --- a/rpcperms/interceptor.go +++ b/rpcperms/interceptor.go @@ -817,14 +817,27 @@ func (r *InterceptorChain) middlewareUnaryServerInterceptor() grpc.UnaryServerIn return nil, err } - resp, respErr := handler(ctx, req) - if respErr != nil { - return resp, respErr + // Call the handler, which executes the request against lnd. + lndResp, lndErr := handler(ctx, req) + if lndErr != nil { + // The call to lnd ended in an error and not a normal + // proto message response. Send the error to the + // interceptor as well to inform about the abnormal + // termination of the stream and to give the option to + // replace the error message with a custom one. + replacedErr, err := r.interceptMessage( + ctx, TypeResponse, requestID, false, + info.FullMethod, lndErr, + ) + if err != nil { + return nil, err + } + return lndResp, replacedErr.(error) } return r.interceptMessage( ctx, TypeResponse, requestID, false, info.FullMethod, - resp, + lndResp, ) } } @@ -883,7 +896,27 @@ func (r *InterceptorChain) middlewareStreamServerInterceptor() grpc.StreamServer interceptor: r, } - return handler(srv, wrappedSS) + // Call the stream handler, which will block as long as the + // stream is alive. + lndErr := handler(srv, wrappedSS) + if lndErr != nil { + // This is an error being returned from lnd. Send it to + // the interceptor as well to inform about the abnormal + // termination of the stream and to give the option to + // replace the error message with a custom one. + replacedErr, err := r.interceptMessage( + ss.Context(), TypeResponse, requestID, + true, info.FullMethod, lndErr, + ) + if err != nil { + return err + } + + return replacedErr.(error) + } + + // Normal/successful termination of the stream. + return nil } } diff --git a/rpcperms/middleware_handler.go b/rpcperms/middleware_handler.go index 7ccad0b58..1e9d16b56 100644 --- a/rpcperms/middleware_handler.go +++ b/rpcperms/middleware_handler.go @@ -263,24 +263,41 @@ func (h *MiddlewareHandler) sendInterceptRequests(errChan chan error, break } - // For intercepted messages we also allow the - // content itself to be overwritten. - if t.ReplaceResponse { - response.replace = true - protoMsg, err := parseProto( - requestInfo.request.ProtoTypeName, - t.ReplacementSerialized, + // If there's nothing to replace, we're done, + // this request was just accepted. + if !t.ReplaceResponse { + break + } + + // We are replacing the response, the question + // now just is: was it an error or a proper + // proto message? + response.replace = true + if requestInfo.request.IsError { + response.replacement = errors.New( + string(t.ReplacementSerialized), ) - if err != nil { - response.err = err - - break - } - - response.replacement = protoMsg + break } + // Not an error but a proper proto message that + // needs to be replaced. For that we need to + // parse it from the raw bytes into the full RPC + // message. + protoMsg, err := parseProto( + requestInfo.request.ProtoTypeName, + t.ReplacementSerialized, + ) + + if err != nil { + response.err = err + + break + } + + response.replacement = protoMsg + default: return fmt.Errorf("unknown middleware "+ "message: %v", msg) @@ -369,6 +386,10 @@ type InterceptionRequest struct { // ProtoTypeName is the fully qualified name of the protobuf type of the // request or response message that is serialized in the field above. ProtoTypeName string + + // IsError indicates that the message contained within this request is + // an error. Will only ever be true for response messages. + IsError bool } // NewMessageInterceptionRequest creates a new interception request for either @@ -382,24 +403,36 @@ func NewMessageInterceptionRequest(ctx context.Context, return nil, err } - rpcReq, ok := m.(proto.Message) - if !ok { - return nil, fmt.Errorf("msg is not proto message: %v", m) - } - rawRequest, err := proto.Marshal(rpcReq) - if err != nil { - return nil, fmt.Errorf("cannot marshal proto msg: %v", err) + req := &InterceptionRequest{ + Type: authType, + StreamRPC: isStream, + Macaroon: mac, + RawMacaroon: rawMacaroon, + FullURI: fullMethod, } - return &InterceptionRequest{ - Type: authType, - StreamRPC: isStream, - Macaroon: mac, - RawMacaroon: rawMacaroon, - FullURI: fullMethod, - ProtoSerialized: rawRequest, - ProtoTypeName: string(proto.MessageName(rpcReq)), - }, nil + // The message is either a proto message or an error, we don't support + // any other types being intercepted. + switch t := m.(type) { + case proto.Message: + req.ProtoSerialized, err = proto.Marshal(t) + if err != nil { + return nil, fmt.Errorf("cannot marshal proto msg: %v", + err) + } + req.ProtoTypeName = string(proto.MessageName(t)) + + case error: + req.ProtoSerialized = []byte(t.Error()) + req.ProtoTypeName = "error" + req.IsError = true + + default: + return nil, fmt.Errorf("unsupported type for interception "+ + "request: %v", m) + } + + return req, nil } // NewStreamAuthInterceptionRequest creates a new interception request for a @@ -484,6 +517,7 @@ func (r *InterceptionRequest) ToRPC(requestID, StreamRpc: r.StreamRPC, TypeName: r.ProtoTypeName, Serialized: r.ProtoSerialized, + IsError: r.IsError, }, } @@ -549,8 +583,14 @@ func replaceProtoMsg(target interface{}, replacement interface{}) error { return fmt.Errorf("replacement message is of wrong type") } - proto.Reset(targetMsg) - proto.Merge(targetMsg, replacementMsg) + replacementBytes, err := proto.Marshal(replacementMsg) + if err != nil { + return fmt.Errorf("error marshaling replacement: %v", err) + } + err = proto.Unmarshal(replacementBytes, targetMsg) + if err != nil { + return fmt.Errorf("error unmarshaling replacement: %v", err) + } return nil } From e1efb3917729b89d12f11ab130c81bcc828e130d Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:17:02 +0200 Subject: [PATCH 7/9] itest: add integration test for request replacement --- .../lnd_rpc_middleware_interceptor_test.go | 109 +++++++++++++++--- 1 file changed, 92 insertions(+), 17 deletions(-) diff --git a/lntest/itest/lnd_rpc_middleware_interceptor_test.go b/lntest/itest/lnd_rpc_middleware_interceptor_test.go index de1a48381..8419179cb 100644 --- a/lntest/itest/lnd_rpc_middleware_interceptor_test.go +++ b/lntest/itest/lnd_rpc_middleware_interceptor_test.go @@ -10,6 +10,7 @@ import ( "github.com/lightningnetwork/lnd/lnrpc" "github.com/lightningnetwork/lnd/lntest" "github.com/lightningnetwork/lnd/macaroons" + "github.com/lightningnetwork/lnd/zpay32" "github.com/stretchr/testify/require" "google.golang.org/protobuf/proto" "gopkg.in/macaroon.v2" @@ -41,13 +42,20 @@ func testRPCMiddlewareInterceptor(net *lntest.NetworkHarness, t *harnessTest) { net.Alice.ReadMacPath(), defaultTimeout, ) require.NoError(t.t, err) + adminMac, err := net.Alice.ReadMacaroon( + net.Alice.AdminMacPath(), defaultTimeout, + ) + require.NoError(t.t, err) - customCaveatMac, err := macaroons.SafeCopyMacaroon(readonlyMac) + customCaveatReadonlyMac, err := macaroons.SafeCopyMacaroon(readonlyMac) require.NoError(t.t, err) addConstraint := macaroons.CustomConstraint( "itest-caveat", "itest-value", ) - require.NoError(t.t, addConstraint(customCaveatMac)) + require.NoError(t.t, addConstraint(customCaveatReadonlyMac)) + customCaveatAdminMac, err := macaroons.SafeCopyMacaroon(adminMac) + require.NoError(t.t, err) + require.NoError(t.t, addConstraint(customCaveatAdminMac)) // Run all sub-tests now. We can't run anything in parallel because that // would cause the main test function to exit and the nodes being @@ -66,7 +74,7 @@ func testRPCMiddlewareInterceptor(net *lntest.NetworkHarness, t *harnessTest) { middlewareInterceptionTest( tt, net.Alice, net.Bob, registration, readonlyMac, - customCaveatMac, true, + customCaveatReadonlyMac, true, ) }) @@ -83,8 +91,8 @@ func testRPCMiddlewareInterceptor(net *lntest.NetworkHarness, t *harnessTest) { defer registration.cancel() middlewareInterceptionTest( - tt, net.Alice, net.Bob, registration, customCaveatMac, - readonlyMac, false, + tt, net.Alice, net.Bob, registration, + customCaveatReadonlyMac, readonlyMac, false, ) }) @@ -99,7 +107,10 @@ func testRPCMiddlewareInterceptor(net *lntest.NetworkHarness, t *harnessTest) { ) defer registration.cancel() - middlewareManipulationTest( + middlewareRequestManipulationTest( + tt, net.Alice, registration, adminMac, true, + ) + middlewareResponseManipulationTest( tt, net.Alice, net.Bob, registration, readonlyMac, true, ) }) @@ -113,10 +124,14 @@ func testRPCMiddlewareInterceptor(net *lntest.NetworkHarness, t *harnessTest) { ) defer registration.cancel() - middlewareManipulationTest( - tt, net.Alice, net.Bob, registration, customCaveatMac, + middlewareRequestManipulationTest( + tt, net.Alice, registration, customCaveatAdminMac, false, ) + middlewareResponseManipulationTest( + tt, net.Alice, net.Bob, registration, + customCaveatReadonlyMac, false, + ) }) // And finally make sure mandatory middleware is always checked for any @@ -195,7 +210,7 @@ func middlewareInterceptionTest(t *testing.T, node *lntest.HarnessNode, // block the execution of the main task otherwise. req := &lnrpc.ListChannelsRequest{ActiveOnly: true} go registration.interceptUnary( - "/lnrpc.Lightning/ListChannels", req, nil, readOnly, + "/lnrpc.Lightning/ListChannels", req, nil, readOnly, false, ) // Do the actual call now and wait for the interceptor to do its thing. @@ -292,10 +307,10 @@ func middlewareInterceptionTest(t *testing.T, node *lntest.HarnessNode, } } -// middlewareManipulationTest tests that unary and streaming requests can be -// intercepted and also manipulated, at least if the middleware didn't register -// for read-only access. -func middlewareManipulationTest(t *testing.T, node *lntest.HarnessNode, +// middlewareResponseManipulationTest tests that unary and streaming responses +// can be intercepted and also manipulated, at least if the middleware didn't +// register for read-only access. +func middlewareResponseManipulationTest(t *testing.T, node *lntest.HarnessNode, peer *lntest.HarnessNode, registration *middlewareHarness, userMac *macaroon.Macaroon, readOnly bool) { @@ -327,7 +342,7 @@ func middlewareManipulationTest(t *testing.T, node *lntest.HarnessNode, req := &lnrpc.ListChannelsRequest{ActiveOnly: true} go registration.interceptUnary( "/lnrpc.Lightning/ListChannels", req, replacementResponse, - readOnly, + readOnly, false, ) // Do the actual call now and wait for the interceptor to do its thing. @@ -384,6 +399,58 @@ func middlewareManipulationTest(t *testing.T, node *lntest.HarnessNode, peerCancel() } +// middlewareRequestManipulationTest tests that unary and streaming requests +// can be intercepted and also manipulated, at least if the middleware didn't +// register for read-only access. +func middlewareRequestManipulationTest(t *testing.T, node *lntest.HarnessNode, + registration *middlewareHarness, userMac *macaroon.Macaroon, + readOnly bool) { + + // Everything we test here should be executed in a matter of + // milliseconds, so we can use one single timeout context for all calls. + ctxb := context.Background() + ctxc, cancel := context.WithTimeout(ctxb, defaultTimeout) + defer cancel() + + // Create a client connection that we'll use to simulate user requests + // to lnd with. + cleanup, client := macaroonClient(t, node, userMac) + defer cleanup() + + // We're going to attempt to replace the request with our own. But since + // we only registered for read-only access, our replacement should just + // be ignored. + replacementRequest := &lnrpc.Invoice{ + Memo: "This is the replaced memo", + Value: 777444, + } + + // We're going to send a simple RPC request to add an invoice. We need + // to invoke the intercept logic in a goroutine because we'd block the + // execution of the main task otherwise. + req := &lnrpc.Invoice{ + Memo: "Plz pay me", + Value: 123456, + } + go registration.interceptUnary( + "/lnrpc.Lightning/AddInvoice", req, replacementRequest, + readOnly, true, + ) + + // Do the actual call now and wait for the interceptor to do its thing. + resp, err := client.AddInvoice(ctxc, req) + require.NoError(t, err) + + // Did we get the manipulated response or the original one? + invoice, err := zpay32.Decode(resp.PaymentRequest, harnessNetParams) + require.NoError(t, err) + if readOnly { + require.Equal(t, req.Memo, *invoice.Description) + } else { + require.Equal(t, replacementRequest.Memo, *invoice.Description) + } +} + // middlewareMandatoryTest tests that all RPC requests are blocked if there is // a mandatory middleware declared that's currently not registered. func middlewareMandatoryTest(t *testing.T, node *lntest.HarnessNode, @@ -524,7 +591,7 @@ func registerMiddleware(t *testing.T, node *lntest.HarnessNode, // read from the response channel. func (h *middlewareHarness) interceptUnary(methodURI string, expectedRequest proto.Message, responseReplacement proto.Message, - readOnly bool) { + readOnly bool, replaceRequest bool) { // Read intercept message and make sure it's for an RPC request. reqIntercept, err := h.stream.Recv() @@ -547,7 +614,11 @@ func (h *middlewareHarness) interceptUnary(methodURI string, assertInterceptedType(h.t, expectedRequest, req) // We need to accept the request. - h.sendAccept(reqIntercept.MsgId, nil) + if replaceRequest { + h.sendAccept(reqIntercept.MsgId, responseReplacement) + } else { + h.sendAccept(reqIntercept.MsgId, nil) + } // Now read the intercept message for the response. respIntercept, err := h.stream.Recv() @@ -562,7 +633,11 @@ func (h *middlewareHarness) interceptUnary(methodURI string, require.NotEqual(h.t, reqIntercept.MsgId, respIntercept.MsgId) // We need to accept the response as well. - h.sendAccept(respIntercept.MsgId, responseReplacement) + if replaceRequest { + h.sendAccept(respIntercept.MsgId, nil) + } else { + h.sendAccept(respIntercept.MsgId, responseReplacement) + } h.responsesChan <- res } From 9774db614b90130a2cb11aadeeb4ce9c9987bc20 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:17:03 +0200 Subject: [PATCH 8/9] itest: add integration test for error interception --- .../lnd_rpc_middleware_interceptor_test.go | 110 +++++++++++++++++- 1 file changed, 104 insertions(+), 6 deletions(-) diff --git a/lntest/itest/lnd_rpc_middleware_interceptor_test.go b/lntest/itest/lnd_rpc_middleware_interceptor_test.go index 8419179cb..7308bc335 100644 --- a/lntest/itest/lnd_rpc_middleware_interceptor_test.go +++ b/lntest/itest/lnd_rpc_middleware_interceptor_test.go @@ -220,6 +220,26 @@ func middlewareInterceptionTest(t *testing.T, node *lntest.HarnessNode, // Did we receive the correct intercept message? assertInterceptedType(t, resp, <-registration.responsesChan) + // Also try the interception of a request that is expected to result in + // an error being returned from lnd. + expectedErr := "either `active_only` or `inactive_only` can be set" + invalidReq := &lnrpc.ListChannelsRequest{ + ActiveOnly: true, + InactiveOnly: true, + } + go registration.interceptUnary( + "/lnrpc.Lightning/ListChannels", invalidReq, nil, readOnly, + false, + ) + + // Do the actual call now and wait for the interceptor to do its thing. + _, err = client.ListChannels(ctxc, invalidReq) + require.Error(t, err) + require.Contains(t, err.Error(), expectedErr) + + // Did we receive the correct intercept message with the error? + assertInterceptedErr(t, expectedErr, <-registration.responsesChan) + // Let's test the same for a streaming endpoint. req2 := &lnrpc.PeerEventSubscription{} go registration.interceptStream( @@ -357,6 +377,32 @@ func middlewareResponseManipulationTest(t *testing.T, node *lntest.HarnessNode, require.Len(t, resp.Channels, 2) } + // Let's see if we can also replace an error message sent out by lnd + // with a custom one. + betterError := fmt.Errorf("yo, this request is no good") + invalidReq := &lnrpc.ListChannelsRequest{ + ActiveOnly: true, + InactiveOnly: true, + } + go registration.interceptUnary( + "/lnrpc.Lightning/ListChannels", invalidReq, betterError, + readOnly, false, + ) + + // Do the actual call now and wait for the interceptor to do its thing. + _, err = client.ListChannels(ctxc, invalidReq) + require.Error(t, err) + + // Did we get the manipulated error or the original one? + if readOnly { + require.Contains( + t, err.Error(), "either `active_only` or "+ + "`inactive_only` can be set", + ) + } else { + require.Contains(t, err.Error(), betterError.Error()) + } + // Let's test the same for a streaming endpoint. replacementResponse2 := &lnrpc.PeerEvent{ Type: lnrpc.PeerEvent_PEER_ONLINE, @@ -421,8 +467,7 @@ func middlewareRequestManipulationTest(t *testing.T, node *lntest.HarnessNode, // we only registered for read-only access, our replacement should just // be ignored. replacementRequest := &lnrpc.Invoice{ - Memo: "This is the replaced memo", - Value: 777444, + Memo: "This is the replaced memo", } // We're going to send a simple RPC request to add an invoice. We need @@ -449,6 +494,36 @@ func middlewareRequestManipulationTest(t *testing.T, node *lntest.HarnessNode, } else { require.Equal(t, replacementRequest.Memo, *invoice.Description) } + + // Read the message from the registration, otherwise we cannot check the + // next one. + <-registration.responsesChan + + // Make sure we also get errors intercepted for stream events. We do + // this in the request manipulation test because only here we have a + // macaroon with sufficient permissions (admin macaroon) to attempt to + // call a streaming RPC that actually accepts request parameters that we + // can use to provoke an error message. + expectedErr := "channel is too small" + invalidReq := &lnrpc.OpenChannelRequest{ + LocalFundingAmount: 5, + } + go registration.interceptStream( + "/lnrpc.Lightning/OpenChannel", invalidReq, nil, readOnly, + ) + + // Do the actual call now and wait for the interceptor to do its thing. + // We don't receive the error on the RPC call directly, because that + // only returns the stream. We have to attempt to read a response first + // to get the expected error. + responseStream, err := client.OpenChannel(ctxc, invalidReq) + require.NoError(t, err) + + _, err = responseStream.Recv() + require.Error(t, err) + require.Contains(t, err.Error(), expectedErr) + + assertInterceptedErr(t, expectedErr, <-registration.responsesChan) } // middlewareMandatoryTest tests that all RPC requests are blocked if there is @@ -545,6 +620,19 @@ func assertInterceptedType(t *testing.T, rpcMessage proto.Message, require.Equal(t, rawRequest, interceptMessage.Serialized) } +// assertInterceptedErr makes sure that the intercept message sent by the RPC +// interceptor contains an error message instead of a serialized proto message. +func assertInterceptedErr(t *testing.T, errString string, + interceptMessage *lnrpc.RPCMessage) { + + t.Helper() + + require.Equal(t, "error", interceptMessage.TypeName) + require.True(t, interceptMessage.IsError) + + require.Contains(t, string(interceptMessage.Serialized), errString) +} + // middlewareStream is a type alias to shorten the long definition. type middlewareStream lnrpc.Lightning_RegisterRPCMiddlewareClient @@ -590,7 +678,7 @@ func registerMiddleware(t *testing.T, node *lntest.HarnessNode, // NOTE: Must be called in a goroutine as this will block until the response is // read from the response channel. func (h *middlewareHarness) interceptUnary(methodURI string, - expectedRequest proto.Message, responseReplacement proto.Message, + expectedRequest proto.Message, responseReplacement interface{}, readOnly bool, replaceRequest bool) { // Read intercept message and make sure it's for an RPC request. @@ -711,13 +799,23 @@ func (h *middlewareHarness) interceptStream(methodURI string, // sendAccept sends an accept feedback to the RPC server. func (h *middlewareHarness) sendAccept(msgID uint64, - responseReplacement proto.Message) { + responseReplacement interface{}) { var replacementBytes []byte if responseReplacement != nil { var err error - replacementBytes, err = proto.Marshal(responseReplacement) - require.NoError(h.t, err) + + switch t := responseReplacement.(type) { + case proto.Message: + replacementBytes, err = proto.Marshal(t) + require.NoError(h.t, err) + + case error: + replacementBytes = []byte(t.Error()) + + default: + require.Fail(h.t, "invalid replacement type") + } } err := h.stream.Send(&lnrpc.RPCMiddlewareResponse{ From f649c6fd47103f99fe5cb0f3a2f905f6ce0bec8f Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Wed, 6 Jul 2022 21:17:04 +0200 Subject: [PATCH 9/9] docs: update release notes --- docs/release-notes/release-notes-0.15.1.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/docs/release-notes/release-notes-0.15.1.md b/docs/release-notes/release-notes-0.15.1.md index 7ce734a01..66728cb91 100644 --- a/docs/release-notes/release-notes-0.15.1.md +++ b/docs/release-notes/release-notes-0.15.1.md @@ -52,6 +52,11 @@ * [Add wallet reserve RPC & field in wallet balance](https://github.com/lightningnetwork/lnd/pull/6592). +* The RPC middleware interceptor now also allows [requests to be + replaced](https://github.com/lightningnetwork/lnd/pull/6630) instead of just + responses. In addition to that, errors returned from `lnd` can now also be + intercepted and changed by the middleware. + ## Bug Fixes * Fixed data race found in