/
login_attempt_cache.go
174 lines (153 loc) · 4.22 KB
/
login_attempt_cache.go
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// Copyright 2022 The Nakama Authors
//
// Licensed 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 server
import (
"context"
"sync"
"time"
)
type LockoutType uint8
const (
LockoutTypeNone LockoutType = iota
LockoutTypeAccount
LockoutTypeIp
)
const (
maxAttemptsAccount = 5
lockoutPeriodAccount = time.Minute * 1
maxAttemptsIp = 10
lockoutPeriodIp = time.Minute * 10
)
type LoginAttemptCache interface {
Stop()
// Allow checks whether account or IP is locked out or should be allowed to attempt to authenticate.
Allow(account, ip string) bool
// Add a failed attempt and return current lockout status.
Add(account, ip string) (LockoutType, time.Time)
// Reset account attempts on successful login.
Reset(account string)
}
type lockoutStatus struct {
lockedUntil time.Time
attempts []time.Time
}
func (ls *lockoutStatus) trim(now time.Time, retentionPeriod time.Duration) bool {
if ls.lockedUntil.Before(now) {
ls.lockedUntil = time.Time{}
}
for i := len(ls.attempts) - 1; i >= 0; i-- {
if now.Sub(ls.attempts[i]) >= retentionPeriod {
ls.attempts = ls.attempts[i+1:]
break
}
}
return ls.lockedUntil.IsZero() && len(ls.attempts) == 0
}
type LocalLoginAttemptCache struct {
sync.RWMutex
ctx context.Context
ctxCancelFn context.CancelFunc
accountCache map[string]*lockoutStatus
ipCache map[string]*lockoutStatus
}
func NewLocalLoginAttemptCache() LoginAttemptCache {
ctx, ctxCancelFn := context.WithCancel(context.Background())
c := &LocalLoginAttemptCache{
accountCache: make(map[string]*lockoutStatus),
ipCache: make(map[string]*lockoutStatus),
ctx: ctx,
ctxCancelFn: ctxCancelFn,
}
go func() {
ticker := time.NewTicker(10 * time.Minute)
for {
select {
case <-c.ctx.Done():
ticker.Stop()
return
case t := <-ticker.C:
now := t.UTC()
c.Lock()
for account, status := range c.accountCache {
if status.trim(now, lockoutPeriodAccount) {
delete(c.accountCache, account)
}
}
for ip, status := range c.ipCache {
if status.trim(now, lockoutPeriodIp) {
delete(c.ipCache, ip)
}
}
c.Unlock()
}
}
}()
return c
}
func (c *LocalLoginAttemptCache) Stop() {
c.ctxCancelFn()
}
func (c *LocalLoginAttemptCache) Allow(account, ip string) bool {
now := time.Now().UTC()
c.RLock()
defer c.RUnlock()
if status, found := c.accountCache[account]; found && !status.lockedUntil.IsZero() && status.lockedUntil.After(now) {
return false
}
if status, found := c.ipCache[ip]; found && !status.lockedUntil.IsZero() && status.lockedUntil.After(now) {
return false
}
return true
}
func (c *LocalLoginAttemptCache) Reset(account string) {
c.Lock()
delete(c.accountCache, account)
c.Unlock()
}
func (c *LocalLoginAttemptCache) Add(account, ip string) (LockoutType, time.Time) {
now := time.Now().UTC()
var lockoutType LockoutType
var lockedUntil time.Time
c.Lock()
defer c.Unlock()
if account != "" {
status, found := c.accountCache[account]
if !found {
status = &lockoutStatus{}
c.accountCache[account] = status
}
status.attempts = append(status.attempts, now)
_ = status.trim(now, lockoutPeriodAccount)
if len(status.attempts) >= maxAttemptsAccount {
status.lockedUntil = now.Add(lockoutPeriodAccount)
lockedUntil = status.lockedUntil
lockoutType = LockoutTypeAccount
}
}
//if ip != "" {
// status, found := c.ipCache[ip]
// if !found {
// status = &lockoutStatus{}
// c.ipCache[ip] = status
// }
// status.attempts = append(status.attempts, now)
// _ = status.trim(now, lockoutPeriodIp)
// if len(status.attempts) >= maxAttemptsIp {
// status.lockedUntil = now.Add(lockoutPeriodIp)
// lockedUntil = status.lockedUntil
// lockoutType = LockoutTypeIp
// }
//}
return lockoutType, lockedUntil
}