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