mirror of
https://github.com/binwiederhier/ntfy.git
synced 2024-12-26 19:52:30 +01:00
532 lines
18 KiB
Go
532 lines
18 KiB
Go
package server
|
|
|
|
import (
|
|
"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)
|
|
|
|
// visitorDefaultCallsLimit is the amount of calls a user without a tier is allowed to make.
|
|
// This number is zero, because phone numbers have to be verified first.
|
|
visitorDefaultCallsLimit = int64(0)
|
|
)
|
|
|
|
// Constants used to convert a tier-user's MessageLimit (see user.Tier) into adequate request limiter
|
|
// values (token bucket). This is only used to increase the values in server.yml, never decrease them.
|
|
//
|
|
// 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
|
|
)
|
|
|
|
// 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
|
|
callsLimiter *util.FixedLimiter // Rate limiter for calls
|
|
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
|
|
authLimiter *rate.Limiter // Limiter for incorrect login attempts, 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.RWMutex
|
|
}
|
|
|
|
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
|
|
CallLimit int64
|
|
ReservationsLimit int64
|
|
AttachmentTotalSizeLimit int64
|
|
AttachmentFileSizeLimit int64
|
|
AttachmentExpiryDuration time.Duration
|
|
AttachmentBandwidthLimit int64
|
|
}
|
|
|
|
type visitorStats struct {
|
|
Messages int64
|
|
MessagesRemaining int64
|
|
Emails int64
|
|
EmailsRemaining int64
|
|
Calls int64
|
|
CallsRemaining 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, calls int64
|
|
if user != nil {
|
|
messages = user.Stats.Messages
|
|
emails = user.Stats.Emails
|
|
calls = user.Stats.Calls
|
|
}
|
|
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
|
|
callsLimiter: nil, // Set in resetLimiters, may be nil
|
|
bandwidthLimiter: nil, // Set in resetLimiters
|
|
accountLimiter: nil, // Set in resetLimiters, may be nil
|
|
authLimiter: nil, // Set in resetLimiters, may be nil
|
|
}
|
|
v.resetLimitersNoLock(messages, emails, calls, false)
|
|
return v
|
|
}
|
|
|
|
func (v *visitor) Context() log.Context {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
return v.contextNoLock()
|
|
}
|
|
|
|
func (v *visitor) contextNoLock() log.Context {
|
|
info := v.infoLightNoLock()
|
|
fields := log.Context{
|
|
"visitor_id": visitorID(v.ip, v.user),
|
|
"visitor_ip": v.ip.String(),
|
|
"visitor_seen": util.FormatTime(v.seen),
|
|
"visitor_messages": info.Stats.Messages,
|
|
"visitor_messages_limit": info.Limits.MessageLimit,
|
|
"visitor_messages_remaining": info.Stats.MessagesRemaining,
|
|
"visitor_request_limiter_limit": v.requestLimiter.Limit(),
|
|
"visitor_request_limiter_tokens": v.requestLimiter.Tokens(),
|
|
}
|
|
if v.config.SMTPSenderFrom != "" {
|
|
fields["visitor_emails"] = info.Stats.Emails
|
|
fields["visitor_emails_limit"] = info.Limits.EmailLimit
|
|
fields["visitor_emails_remaining"] = info.Stats.EmailsRemaining
|
|
}
|
|
if v.config.TwilioAccount != "" {
|
|
fields["visitor_calls"] = info.Stats.Calls
|
|
fields["visitor_calls_limit"] = info.Limits.CallLimit
|
|
fields["visitor_calls_remaining"] = info.Stats.CallsRemaining
|
|
}
|
|
if v.authLimiter != nil {
|
|
fields["visitor_auth_limiter_limit"] = v.authLimiter.Limit()
|
|
fields["visitor_auth_limiter_tokens"] = v.authLimiter.Tokens()
|
|
}
|
|
if v.user != nil {
|
|
fields["user_id"] = v.user.ID
|
|
fields["user_name"] = v.user.Name
|
|
if v.user.Tier != nil {
|
|
for field, value := range v.user.Tier.Context() {
|
|
fields[field] = value
|
|
}
|
|
}
|
|
if v.user.Billing.StripeCustomerID != "" {
|
|
fields["stripe_customer_id"] = v.user.Billing.StripeCustomerID
|
|
}
|
|
if v.user.Billing.StripeSubscriptionID != "" {
|
|
fields["stripe_subscription_id"] = v.user.Billing.StripeSubscriptionID
|
|
}
|
|
}
|
|
return fields
|
|
}
|
|
|
|
func visitorExtendedInfoContext(info *visitorInfo) log.Context {
|
|
return log.Context{
|
|
"visitor_reservations": info.Stats.Reservations,
|
|
"visitor_reservations_limit": info.Limits.ReservationsLimit,
|
|
"visitor_reservations_remaining": info.Stats.ReservationsRemaining,
|
|
"visitor_attachment_total_size": info.Stats.AttachmentTotalSize,
|
|
"visitor_attachment_total_size_limit": info.Limits.AttachmentTotalSizeLimit,
|
|
"visitor_attachment_total_size_remaining": info.Stats.AttachmentTotalSizeRemaining,
|
|
}
|
|
|
|
}
|
|
func (v *visitor) RequestAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.requestLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) FirebaseAllowed() bool {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
return !time.Now().Before(v.firebase)
|
|
}
|
|
|
|
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.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.messagesLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) EmailAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.emailsLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) CallAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.callsLimiter.Allow()
|
|
}
|
|
|
|
func (v *visitor) SubscriptionAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.subscriptionLimiter.Allow()
|
|
}
|
|
|
|
// AuthAllowed returns true if an auth request can be attempted (> 1 token available)
|
|
func (v *visitor) AuthAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
if v.authLimiter == nil {
|
|
return true
|
|
}
|
|
return v.authLimiter.Tokens() > 1
|
|
}
|
|
|
|
// AuthFailed records an auth failure
|
|
func (v *visitor) AuthFailed() {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
if v.authLimiter != nil {
|
|
v.authLimiter.Allow()
|
|
}
|
|
}
|
|
|
|
// AccountCreationAllowed returns true if a new account can be created
|
|
func (v *visitor) AccountCreationAllowed() bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
if v.accountLimiter == nil || (v.accountLimiter != nil && v.accountLimiter.Tokens() < 1) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// AccountCreated decreases the account limiter. This is to be called after an account was created.
|
|
func (v *visitor) AccountCreated() {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
if v.accountLimiter != nil {
|
|
v.accountLimiter.Allow()
|
|
}
|
|
}
|
|
|
|
func (v *visitor) BandwidthAllowed(bytes int64) bool {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.bandwidthLimiter.AllowN(bytes)
|
|
}
|
|
|
|
func (v *visitor) RemoveSubscription() {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
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.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return v.bandwidthLimiter
|
|
}
|
|
|
|
func (v *visitor) Stale() bool {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
return time.Since(v.seen) > visitorExpungeAfter
|
|
}
|
|
|
|
func (v *visitor) Stats() *user.Stats {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
return &user.Stats{
|
|
Messages: v.messagesLimiter.Value(),
|
|
Emails: v.emailsLimiter.Value(),
|
|
Calls: v.callsLimiter.Value(),
|
|
}
|
|
}
|
|
|
|
func (v *visitor) ResetStats() {
|
|
v.mu.RLock() // limiters could be replaced!
|
|
defer v.mu.RUnlock()
|
|
v.emailsLimiter.Reset()
|
|
v.messagesLimiter.Reset()
|
|
v.callsLimiter.Reset()
|
|
}
|
|
|
|
// User returns the visitor user, or nil if there is none
|
|
func (v *visitor) User() *user.User {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
return v.user // May be nil
|
|
}
|
|
|
|
// IP returns the visitor IP address
|
|
func (v *visitor) IP() netip.Addr {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
return v.ip
|
|
}
|
|
|
|
// Authenticated returns true if a user successfully authenticated
|
|
func (v *visitor) Authenticated() bool {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
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 // u may be nil!
|
|
if shouldResetLimiters {
|
|
var messages, emails, calls int64
|
|
if u != nil {
|
|
messages, emails, calls = u.Stats.Messages, u.Stats.Emails, u.Stats.Calls
|
|
}
|
|
v.resetLimitersNoLock(messages, emails, calls, true)
|
|
}
|
|
}
|
|
|
|
// 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.RLock()
|
|
defer v.mu.RUnlock()
|
|
if v.user != nil {
|
|
return v.user.ID
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func (v *visitor) resetLimitersNoLock(messages, emails, calls int64, enqueueUpdate bool) {
|
|
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.callsLimiter = util.NewFixedLimiterWithValue(limits.CallLimit, calls)
|
|
v.bandwidthLimiter = util.NewBytesLimiter(int(limits.AttachmentBandwidthLimit), oneDay)
|
|
if v.user == nil {
|
|
v.accountLimiter = rate.NewLimiter(rate.Every(v.config.VisitorAccountCreationLimitReplenish), v.config.VisitorAccountCreationLimitBurst)
|
|
v.authLimiter = rate.NewLimiter(rate.Every(v.config.VisitorAuthFailureLimitReplenish), v.config.VisitorAuthFailureLimitBurst)
|
|
} else {
|
|
v.accountLimiter = nil // Users cannot create accounts when logged in
|
|
v.authLimiter = nil // Users are already logged in, no need to limit requests
|
|
}
|
|
if enqueueUpdate && v.user != nil {
|
|
go v.userManager.EnqueueUserStats(v.user.ID, &user.Stats{
|
|
Messages: messages,
|
|
Emails: emails,
|
|
Calls: calls,
|
|
})
|
|
}
|
|
log.Fields(v.contextNoLock()).Debug("Rate limiters reset for visitor") // Must be after function, because contextNoLock() describes rate limiters
|
|
}
|
|
|
|
func (v *visitor) Limits() *visitorLimits {
|
|
v.mu.RLock()
|
|
defer v.mu.RUnlock()
|
|
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: util.Max(rate.Every(conf.VisitorRequestLimitReplenish), 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),
|
|
CallLimit: tier.CallLimit,
|
|
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),
|
|
CallLimit: visitorDefaultCallsLimit,
|
|
ReservationsLimit: visitorDefaultReservationsLimit,
|
|
AttachmentTotalSizeLimit: conf.VisitorAttachmentTotalSizeLimit,
|
|
AttachmentFileSizeLimit: conf.AttachmentFileSizeLimit,
|
|
AttachmentExpiryDuration: conf.AttachmentExpiryDuration,
|
|
AttachmentBandwidthLimit: conf.VisitorAttachmentDailyBandwidthLimit,
|
|
}
|
|
}
|
|
|
|
func (v *visitor) Info() (*visitorInfo, error) {
|
|
v.mu.RLock()
|
|
info := v.infoLightNoLock()
|
|
v.mu.RUnlock()
|
|
|
|
// Attachment stats from database
|
|
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
|
|
}
|
|
info.Stats.AttachmentTotalSize = attachmentsBytesUsed
|
|
info.Stats.AttachmentTotalSizeRemaining = zeroIfNegative(info.Limits.AttachmentTotalSizeLimit - attachmentsBytesUsed)
|
|
|
|
// Reservation stats from database
|
|
var reservations int64
|
|
if v.userManager != nil && u != nil {
|
|
reservations, err = v.userManager.ReservationsCount(u.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
info.Stats.Reservations = reservations
|
|
info.Stats.ReservationsRemaining = zeroIfNegative(info.Limits.ReservationsLimit - reservations)
|
|
|
|
return info, nil
|
|
}
|
|
|
|
func (v *visitor) infoLightNoLock() *visitorInfo {
|
|
messages := v.messagesLimiter.Value()
|
|
emails := v.emailsLimiter.Value()
|
|
calls := v.callsLimiter.Value()
|
|
limits := v.limitsNoLock()
|
|
stats := &visitorStats{
|
|
Messages: messages,
|
|
MessagesRemaining: zeroIfNegative(limits.MessageLimit - messages),
|
|
Emails: emails,
|
|
EmailsRemaining: zeroIfNegative(limits.EmailLimit - emails),
|
|
Calls: calls,
|
|
CallsRemaining: zeroIfNegative(limits.CallLimit - calls),
|
|
}
|
|
return &visitorInfo{
|
|
Limits: limits,
|
|
Stats: stats,
|
|
}
|
|
}
|
|
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())
|
|
}
|