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Better limit for unsuccessful login attempts on the devconsole. (#878)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| // 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 | ||
| } |