414 lines
13 KiB
Go
414 lines
13 KiB
Go
package server
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"heckel.io/ntfy/log"
|
|
"heckel.io/ntfy/user"
|
|
"net/netip"
|
|
"sync"
|
|
"time"
|
|
|
|
"golang.org/x/time/rate"
|
|
"heckel.io/ntfy/util"
|
|
)
|
|
|
|
const (
|
|
// oneDay is an approximation of a day as a time.Duration
|
|
oneDay = 24 * time.Hour
|
|
|
|
// visitorExpungeAfter defines how long a visitor is active before it is removed from memory. This number
|
|
// has to be very high to prevent e-mail abuse, but it doesn't really affect the other limits anyway, since
|
|
// they are replenished faster (typically).
|
|
visitorExpungeAfter = oneDay
|
|
|
|
// visitorDefaultReservationsLimit is the amount of topic names a user without a tier is allowed to reserve.
|
|
// This number is zero, and changing it may have unintended consequences in the web app, or otherwise
|
|
visitorDefaultReservationsLimit = int64(0)
|
|
)
|
|
|
|
// Constants used to convert a tier-user's MessageLimit (see user.Tier) into adequate request limiter
|
|
// values (token bucket).
|
|
//
|
|
// Example: Assuming a user.Tier's MessageLimit is 10,000:
|
|
// - the allowed burst is 500 (= 10,000 * 5%), which is < 1000 (the max)
|
|
// - the replenish rate is 2 * 10,000 / 24 hours
|
|
const (
|
|
visitorMessageToRequestLimitBurstRate = 0.05
|
|
visitorMessageToRequestLimitBurstMax = 1000
|
|
visitorMessageToRequestLimitReplenishFactor = 2
|
|
)
|
|
|
|
// Constants used to convert a tier-user's EmailLimit (see user.Tier) into adequate email limiter
|
|
// values (token bucket). Example: Assuming a user.Tier's EmailLimit is 200, the allowed burst is
|
|
// 40 (= 200 * 20%), which is <150 (the max).
|
|
const (
|
|
visitorEmailLimitBurstRate = 0.2
|
|
visitorEmailLimitBurstMax = 150
|
|
)
|
|
|
|
var (
|
|
errVisitorLimitReached = errors.New("limit reached")
|
|
)
|
|
|
|
// visitor represents an API user, and its associated rate.Limiter used for rate limiting
|
|
type visitor struct {
|
|
config *Config
|
|
messageCache *messageCache
|
|
userManager *user.Manager // May be nil
|
|
ip netip.Addr // Visitor IP address
|
|
user *user.User // Only set if authenticated user, otherwise nil
|
|
requestLimiter *rate.Limiter // Rate limiter for (almost) all requests (including messages)
|
|
messagesLimiter *util.FixedLimiter // Rate limiter for messages
|
|
emailsLimiter *util.RateLimiter // Rate limiter for emails
|
|
subscriptionLimiter *util.FixedLimiter // Fixed limiter for active subscriptions (ongoing connections)
|
|
bandwidthLimiter *util.RateLimiter // Limiter for attachment bandwidth downloads
|
|
accountLimiter *rate.Limiter // Rate limiter for account creation, may be nil
|
|
firebase time.Time // Next allowed Firebase message
|
|
seen time.Time // Last seen time of this visitor (needed for removal of stale visitors)
|
|
mu sync.Mutex
|
|
}
|
|
|
|
type visitorInfo struct {
|
|
Limits *visitorLimits
|
|
Stats *visitorStats
|
|
}
|
|
|
|
type visitorLimits struct {
|
|
Basis visitorLimitBasis
|
|
RequestLimitBurst int
|
|
RequestLimitReplenish rate.Limit
|
|
MessageLimit int64
|
|
MessageExpiryDuration time.Duration
|
|
EmailLimit int64
|
|
EmailLimitBurst int
|
|
EmailLimitReplenish rate.Limit
|
|
ReservationsLimit int64
|
|
AttachmentTotalSizeLimit int64
|
|
AttachmentFileSizeLimit int64
|
|
AttachmentExpiryDuration time.Duration
|
|
AttachmentBandwidthLimit int64
|
|
}
|
|
|
|
type visitorStats struct {
|
|
Messages int64
|
|
MessagesRemaining int64
|
|
Emails int64
|
|
EmailsRemaining int64
|
|
Reservations int64
|
|
ReservationsRemaining int64
|
|
AttachmentTotalSize int64
|
|
AttachmentTotalSizeRemaining int64
|
|
}
|
|
|
|
// visitorLimitBasis describes how the visitor limits were derived, either from a user's
|
|
// IP address (default config), or from its tier
|
|
type visitorLimitBasis string
|
|
|
|
const (
|
|
visitorLimitBasisIP = visitorLimitBasis("ip")
|
|
visitorLimitBasisTier = visitorLimitBasis("tier")
|
|
)
|
|
|
|
func newVisitor(conf *Config, messageCache *messageCache, userManager *user.Manager, ip netip.Addr, user *user.User) *visitor {
|
|
var messages, emails int64
|
|
if user != nil {
|
|
messages = user.Stats.Messages
|
|
emails = user.Stats.Emails
|
|
}
|
|
v := &visitor{
|
|
config: conf,
|
|
messageCache: messageCache,
|
|
userManager: userManager, // May be nil
|
|
ip: ip,
|
|
user: user,
|
|
firebase: time.Unix(0, 0),
|
|
seen: time.Now(),
|
|
subscriptionLimiter: util.NewFixedLimiter(int64(conf.VisitorSubscriptionLimit)),
|
|
requestLimiter: nil, // Set in resetLimiters
|
|
messagesLimiter: nil, // Set in resetLimiters, may be nil
|
|
emailsLimiter: nil, // Set in resetLimiters
|
|
bandwidthLimiter: nil, // Set in resetLimiters
|
|
accountLimiter: nil, // Set in resetLimiters, may be nil
|
|
}
|
|
v.resetLimitersNoLock(messages, emails)
|
|
return v
|
|
}
|
|
|
|
func (v *visitor) String() string {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
return v.stringNoLock()
|
|
}
|
|
|
|
func (v *visitor) stringNoLock() string {
|
|
if v.user != nil && v.user.Billing.StripeCustomerID != "" {
|
|
return fmt.Sprintf("%s/%s/%s", v.ip.String(), v.user.ID, v.user.Billing.StripeCustomerID)
|
|
} else if v.user != nil {
|
|
return fmt.Sprintf("%s/%s", v.ip.String(), v.user.ID)
|
|
}
|
|
return v.ip.String()
|
|
}
|
|
|
|
func (v *visitor) RequestAllowed() error {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
if !v.requestLimiter.Allow() {
|
|
return errVisitorLimitReached
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (v *visitor) FirebaseAllowed() error {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
if time.Now().Before(v.firebase) {
|
|
return errVisitorLimitReached
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (v *visitor) FirebaseTemporarilyDeny() {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
v.firebase = time.Now().Add(v.config.FirebaseQuotaExceededPenaltyDuration)
|
|
}
|
|
|
|
func (v *visitor) MessageAllowed() bool {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return v.messagesLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) EmailAllowed() bool {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return v.emailsLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) SubscriptionAllowed() bool {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return v.subscriptionLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) AccountCreationAllowed() bool {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
if v.accountLimiter == nil || (v.accountLimiter != nil && !v.accountLimiter.Allow()) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (v *visitor) BandwidthAllowed(bytes int64) bool {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return v.bandwidthLimiter.AllowN(bytes)
|
|
}
|
|
|
|
func (v *visitor) RemoveSubscription() {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
v.subscriptionLimiter.AllowN(-1)
|
|
}
|
|
|
|
func (v *visitor) Keepalive() {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
v.seen = time.Now()
|
|
}
|
|
|
|
func (v *visitor) BandwidthLimiter() util.Limiter {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return v.bandwidthLimiter
|
|
}
|
|
|
|
func (v *visitor) Stale() bool {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
return time.Since(v.seen) > visitorExpungeAfter
|
|
}
|
|
|
|
func (v *visitor) Stats() *user.Stats {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
return &user.Stats{
|
|
Messages: v.messagesLimiter.Value(),
|
|
Emails: v.emailsLimiter.Value(),
|
|
}
|
|
}
|
|
|
|
func (v *visitor) ResetStats() {
|
|
v.mu.Lock() // limiters could be replaced!
|
|
defer v.mu.Unlock()
|
|
v.emailsLimiter.Reset()
|
|
v.messagesLimiter.Reset()
|
|
}
|
|
|
|
// User returns the visitor user, or nil if there is none
|
|
func (v *visitor) User() *user.User {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
return v.user // May be nil
|
|
}
|
|
|
|
// Authenticated returns true if a user successfully authenticated
|
|
func (v *visitor) Authenticated() bool {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
return v.user != nil
|
|
}
|
|
|
|
// SetUser sets the visitors user to the given value
|
|
func (v *visitor) SetUser(u *user.User) {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
shouldResetLimiters := v.user.TierID() != u.TierID() // TierID works with nil receiver
|
|
v.user = u
|
|
if shouldResetLimiters {
|
|
v.resetLimitersNoLock(0, 0)
|
|
}
|
|
}
|
|
|
|
// MaybeUserID returns the user ID of the visitor (if any). If this is an anonymous visitor,
|
|
// an empty string is returned.
|
|
func (v *visitor) MaybeUserID() string {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
if v.user != nil {
|
|
return v.user.ID
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func (v *visitor) resetLimitersNoLock(messages, emails int64) {
|
|
log.Debug("%s Resetting limiters for visitor", v.stringNoLock())
|
|
limits := v.limitsNoLock()
|
|
v.requestLimiter = rate.NewLimiter(limits.RequestLimitReplenish, limits.RequestLimitBurst)
|
|
v.messagesLimiter = util.NewFixedLimiterWithValue(limits.MessageLimit, messages)
|
|
v.emailsLimiter = util.NewRateLimiterWithValue(limits.EmailLimitReplenish, limits.EmailLimitBurst, emails)
|
|
v.bandwidthLimiter = util.NewBytesLimiter(int(limits.AttachmentBandwidthLimit), oneDay)
|
|
if v.user == nil {
|
|
v.accountLimiter = rate.NewLimiter(rate.Every(v.config.VisitorAccountCreationLimitReplenish), v.config.VisitorAccountCreationLimitBurst)
|
|
} else {
|
|
v.accountLimiter = nil // Users cannot create accounts when logged in
|
|
}
|
|
}
|
|
|
|
func (v *visitor) Limits() *visitorLimits {
|
|
v.mu.Lock()
|
|
defer v.mu.Unlock()
|
|
return v.limitsNoLock()
|
|
}
|
|
|
|
func (v *visitor) limitsNoLock() *visitorLimits {
|
|
if v.user != nil && v.user.Tier != nil {
|
|
return tierBasedVisitorLimits(v.config, v.user.Tier)
|
|
}
|
|
return configBasedVisitorLimits(v.config)
|
|
}
|
|
|
|
func tierBasedVisitorLimits(conf *Config, tier *user.Tier) *visitorLimits {
|
|
return &visitorLimits{
|
|
Basis: visitorLimitBasisTier,
|
|
RequestLimitBurst: util.MinMax(int(float64(tier.MessageLimit)*visitorMessageToRequestLimitBurstRate), conf.VisitorRequestLimitBurst, visitorMessageToRequestLimitBurstMax),
|
|
RequestLimitReplenish: dailyLimitToRate(tier.MessageLimit * visitorMessageToRequestLimitReplenishFactor),
|
|
MessageLimit: tier.MessageLimit,
|
|
MessageExpiryDuration: tier.MessageExpiryDuration,
|
|
EmailLimit: tier.EmailLimit,
|
|
EmailLimitBurst: util.MinMax(int(float64(tier.EmailLimit)*visitorEmailLimitBurstRate), conf.VisitorEmailLimitBurst, visitorEmailLimitBurstMax),
|
|
EmailLimitReplenish: dailyLimitToRate(tier.EmailLimit),
|
|
ReservationsLimit: tier.ReservationLimit,
|
|
AttachmentTotalSizeLimit: tier.AttachmentTotalSizeLimit,
|
|
AttachmentFileSizeLimit: tier.AttachmentFileSizeLimit,
|
|
AttachmentExpiryDuration: tier.AttachmentExpiryDuration,
|
|
AttachmentBandwidthLimit: tier.AttachmentBandwidthLimit,
|
|
}
|
|
}
|
|
|
|
func configBasedVisitorLimits(conf *Config) *visitorLimits {
|
|
messagesLimit := replenishDurationToDailyLimit(conf.VisitorRequestLimitReplenish) // Approximation!
|
|
if conf.VisitorMessageDailyLimit > 0 {
|
|
messagesLimit = int64(conf.VisitorMessageDailyLimit)
|
|
}
|
|
return &visitorLimits{
|
|
Basis: visitorLimitBasisIP,
|
|
RequestLimitBurst: conf.VisitorRequestLimitBurst,
|
|
RequestLimitReplenish: rate.Every(conf.VisitorRequestLimitReplenish),
|
|
MessageLimit: messagesLimit,
|
|
MessageExpiryDuration: conf.CacheDuration,
|
|
EmailLimit: replenishDurationToDailyLimit(conf.VisitorEmailLimitReplenish), // Approximation!
|
|
EmailLimitBurst: conf.VisitorEmailLimitBurst,
|
|
EmailLimitReplenish: rate.Every(conf.VisitorEmailLimitReplenish),
|
|
ReservationsLimit: visitorDefaultReservationsLimit,
|
|
AttachmentTotalSizeLimit: conf.VisitorAttachmentTotalSizeLimit,
|
|
AttachmentFileSizeLimit: conf.AttachmentFileSizeLimit,
|
|
AttachmentExpiryDuration: conf.AttachmentExpiryDuration,
|
|
AttachmentBandwidthLimit: conf.VisitorAttachmentDailyBandwidthLimit,
|
|
}
|
|
}
|
|
|
|
func (v *visitor) Info() (*visitorInfo, error) {
|
|
v.mu.Lock()
|
|
messages := v.messagesLimiter.Value()
|
|
emails := v.emailsLimiter.Value()
|
|
v.mu.Unlock()
|
|
var attachmentsBytesUsed int64
|
|
var err error
|
|
u := v.User()
|
|
if u != nil {
|
|
attachmentsBytesUsed, err = v.messageCache.AttachmentBytesUsedByUser(u.ID)
|
|
} else {
|
|
attachmentsBytesUsed, err = v.messageCache.AttachmentBytesUsedBySender(v.ip.String())
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var reservations int64
|
|
if v.userManager != nil && u != nil {
|
|
reservations, err = v.userManager.ReservationsCount(u.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
limits := v.Limits()
|
|
stats := &visitorStats{
|
|
Messages: messages,
|
|
MessagesRemaining: zeroIfNegative(limits.MessageLimit - messages),
|
|
Emails: emails,
|
|
EmailsRemaining: zeroIfNegative(limits.EmailLimit - emails),
|
|
Reservations: reservations,
|
|
ReservationsRemaining: zeroIfNegative(limits.ReservationsLimit - reservations),
|
|
AttachmentTotalSize: attachmentsBytesUsed,
|
|
AttachmentTotalSizeRemaining: zeroIfNegative(limits.AttachmentTotalSizeLimit - attachmentsBytesUsed),
|
|
}
|
|
return &visitorInfo{
|
|
Limits: limits,
|
|
Stats: stats,
|
|
}, nil
|
|
}
|
|
|
|
func zeroIfNegative(value int64) int64 {
|
|
if value < 0 {
|
|
return 0
|
|
}
|
|
return value
|
|
}
|
|
|
|
func replenishDurationToDailyLimit(duration time.Duration) int64 {
|
|
return int64(oneDay / duration)
|
|
}
|
|
|
|
func dailyLimitToRate(limit int64) rate.Limit {
|
|
return rate.Limit(limit) * rate.Every(oneDay)
|
|
}
|
|
|
|
func visitorID(ip netip.Addr, u *user.User) string {
|
|
if u != nil && u.Tier != nil {
|
|
return fmt.Sprintf("user:%s", u.ID)
|
|
}
|
|
return fmt.Sprintf("ip:%s", ip.String())
|
|
}
|