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81
server/src/main/java/com/soulfiremc/server/grpc/LoginRateLimitingInterceptor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /* | ||
| * SoulFire | ||
| * Copyright (C) 2024 AlexProgrammerDE | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package com.soulfiremc.server.grpc; | ||
|
|
||
| import com.github.benmanes.caffeine.cache.Cache; | ||
| import com.github.benmanes.caffeine.cache.Caffeine; | ||
| import com.soulfiremc.grpc.generated.LoginServiceGrpc; | ||
| import com.soulfiremc.server.util.RPCConstants; | ||
| import io.grpc.*; | ||
|
|
||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.Objects; | ||
| import java.util.UUID; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| public class LoginRateLimitingInterceptor implements ServerInterceptor { | ||
| private final Cache<UUID, Integer> callCache = Caffeine.newBuilder() | ||
| .expireAfterWrite(10, TimeUnit.MINUTES) | ||
| .build(); | ||
|
|
||
| @Override | ||
| public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall( | ||
| ServerCall<ReqT, RespT> serverCall, | ||
| Metadata metadata, | ||
| ServerCallHandler<ReqT, RespT> serverCallHandler) { | ||
|
|
||
| var status = Status.OK; | ||
| if (Objects.equals(serverCall.getMethodDescriptor().getServiceName(), LoginServiceGrpc.SERVICE_NAME)) { | ||
| var remoteAddr = metadata.get(Metadata.Key.of("origin", Metadata.ASCII_STRING_MARSHALLER)); | ||
| if (remoteAddr == null) { | ||
| status = Status.UNAUTHENTICATED.withDescription("No remote address"); | ||
| } else { | ||
| var key = UUID.nameUUIDFromBytes(remoteAddr.getBytes(StandardCharsets.UTF_8)); | ||
| var count = callCache.getIfPresent(key); | ||
| if (count == null) { | ||
| callCache.put(key, 1); | ||
| } else if (count < RPCConstants.LOGIN_RATE_LIMIT) { | ||
| callCache.put(key, count + 1); | ||
| } | ||
|
|
||
| if (count != null && count >= RPCConstants.LOGIN_RATE_LIMIT) { | ||
| status = Status.RESOURCE_EXHAUSTED.withDescription("Too many login attempts"); | ||
| } else { | ||
| return Contexts.interceptCall( | ||
| Context.current(), | ||
| serverCall, | ||
| metadata, | ||
| serverCallHandler | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| serverCall.close(status, new Metadata()); | ||
| return new ServerCall.Listener<>() { | ||
| // noop | ||
| }; | ||
| } else { | ||
| return Contexts.interceptCall( | ||
| Context.current(), | ||
| serverCall, | ||
| metadata, | ||
| serverCallHandler | ||
| ); | ||
| } | ||
| } | ||
| } |
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