Support for NTLM authentication added (#109)

* Support for NTLM authentication added

To support NTLM authentication, a database is added as an authentication source.
Currently, only the configuration file is supported as a database.
Database authentication supports Basic and NTLM authentication protcols.

ServerConfig.BasicAuthEnabled renamed to LocalEnabled as Basic auth can be used with NTLM or Local.

shared/auth/auth_grpc.pb.go

@@ -1,8 +1,4 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
-// versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.21.5
-// source: auth.proto
 
 package auth
 
@@ -23,6 +19,7 @@ const _ = grpc.SupportPackageIsVersion7
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type AuthenticateClient interface {
 	Authenticate(ctx context.Context, in *UserPass, opts ...grpc.CallOption) (*AuthResponse, error)
+	NTLM(ctx context.Context, in *NtlmRequest, opts ...grpc.CallOption) (*NtlmResponse, error)
 }
 
 type authenticateClient struct {
@@ -42,20 +39,35 @@ func (c *authenticateClient) Authenticate(ctx context.Context, in *UserPass, opt
 	return out, nil
 }
 
+func (c *authenticateClient) NTLM(ctx context.Context, in *NtlmRequest, opts ...grpc.CallOption) (*NtlmResponse, error) {
+	out := new(NtlmResponse)
+	err := c.cc.Invoke(ctx, "/auth.Authenticate/NTLM", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // AuthenticateServer is the server API for Authenticate service.
-// All implementations should embed UnimplementedAuthenticateServer
+// All implementations must embed UnimplementedAuthenticateServer
 // for forward compatibility
 type AuthenticateServer interface {
 	Authenticate(context.Context, *UserPass) (*AuthResponse, error)
+	NTLM(context.Context, *NtlmRequest) (*NtlmResponse, error)
+	mustEmbedUnimplementedAuthenticateServer()
 }
 
-// UnimplementedAuthenticateServer should be embedded to have forward compatible implementations.
+// UnimplementedAuthenticateServer must be embedded to have forward compatible implementations.
 type UnimplementedAuthenticateServer struct {
 }
 
 func (UnimplementedAuthenticateServer) Authenticate(context.Context, *UserPass) (*AuthResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Authenticate not implemented")
 }
+func (UnimplementedAuthenticateServer) NTLM(context.Context, *NtlmRequest) (*NtlmResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method NTLM not implemented")
+}
+func (UnimplementedAuthenticateServer) mustEmbedUnimplementedAuthenticateServer() {}
 
 // UnsafeAuthenticateServer may be embedded to opt out of forward compatibility for this service.
 // Use of this interface is not recommended, as added methods to AuthenticateServer will
@@ -86,6 +98,24 @@ func _Authenticate_Authenticate_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Authenticate_NTLM_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(NtlmRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AuthenticateServer).NTLM(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/auth.Authenticate/NTLM",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AuthenticateServer).NTLM(ctx, req.(*NtlmRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // Authenticate_ServiceDesc is the grpc.ServiceDesc for Authenticate service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -97,6 +127,10 @@ var Authenticate_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Authenticate",
 			Handler:    _Authenticate_Authenticate_Handler,
 		},
+		{
+			MethodName: "NTLM",
+			Handler:    _Authenticate_NTLM_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "auth.proto",