[GitHub] [servicecomb-service-center] tianxiaoliang commented on a change in pull request #666: block user brute force login attempts

[GitBox <gi...@apache.org>]

tianxiaoliang commented on a change in pull request #666:
URL: https://github.com/apache/servicecomb-service-center/pull/666#discussion_r454288918



##########
File path: server/service/rbac/blocker.go
##########
@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rbac
+
+import (
+	"sync"
+	"time"
+
+	"golang.org/x/time/rate"
+)
+
+const (
+	MaxAttempts = 5
+
+	BlockInterval = 1 * time.Hour
+)
+
+var BanTime = 1 * time.Hour
+
+type Client struct {
+	limiter   *rate.Limiter
+	Key       string
+	Banned    bool
+	ReleaseAt time.Time //at this time client can be allow to attempt to do something
+}
+
+var clients sync.Map
+
+func BannedList() []*Client {
+	cs := make([]*Client, 0)
+	clients.Range(func(key, value interface{}) bool {
+		client := value.(*Client)
+		if client.Banned && time.Now().After(client.ReleaseAt) {
+			client.Banned = false
+			client.ReleaseAt = time.Time{}
+			return true
+		}
+		cs = append(cs, value.(*Client))
+		return true
+	})
+	return cs
+}
+
+//CountFailure can cause a client banned
+// it use time/rate to allow certainty failure,
+//but will ban client if rate limiter can not accept failures
+func CountFailure(key string) {
+	var c interface{}
+	var client *Client
+	var ok bool
+	now := time.Now()
+	if c, ok = clients.Load(key); !ok {
+		client = &Client{
+			Key:       key,
+			limiter:   rate.NewLimiter(rate.Every(BlockInterval), MaxAttempts),
+			ReleaseAt: time.Time{},
+		}
+		clients.Store(key, client)
+	} else {
+		client = c.(*Client)
+	}
+
+	allow := client.limiter.AllowN(time.Now(), 1)

Review comment:
       不会出现这种情况，因为ban了之后根本走不进这个逻辑




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