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Rate limit exemption; relates to #144

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This commit is contained in:
Philipp Heckel 2022-02-14 16:09:59 -05:00
parent 0df8aa9a5d
commit 2ad0802b65
3 changed files with 29 additions and 8 deletions
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17
cmd/serve.go
View file

@ -9,6 +9,7 @@ import (
"heckel.io/ntfy/util"
"log"
"math"
"net"
"strings"
"time"
)
@ -45,6 +46,7 @@ var flagsServe = []cli.Flag{
altsrc.NewStringFlag(&cli.StringFlag{Name: "visitor-attachment-daily-bandwidth-limit", EnvVars: []string{"NTFY_VISITOR_ATTACHMENT_DAILY_BANDWIDTH_LIMIT"}, Value: "500M", Usage: "total daily attachment download/upload bandwidth limit per visitor"}),
altsrc.NewIntFlag(&cli.IntFlag{Name: "visitor-request-limit-burst", EnvVars: []string{"NTFY_VISITOR_REQUEST_LIMIT_BURST"}, Value: server.DefaultVisitorRequestLimitBurst, Usage: "initial limit of requests per visitor"}),
altsrc.NewDurationFlag(&cli.DurationFlag{Name: "visitor-request-limit-replenish", EnvVars: []string{"NTFY_VISITOR_REQUEST_LIMIT_REPLENISH"}, Value: server.DefaultVisitorRequestLimitReplenish, Usage: "interval at which burst limit is replenished (one per x)"}),
altsrc.NewStringFlag(&cli.StringFlag{Name: "visitor-request-limit-exempt-hosts", EnvVars: []string{"NTFY_VISITOR_REQUEST_LIMIT_EXEMPT_HOSTS"}, Value: "", Usage: "hostnames and/or IP addresses of hosts that will be exempt from the visitor request limit"}),
altsrc.NewIntFlag(&cli.IntFlag{Name: "visitor-email-limit-burst", EnvVars: []string{"NTFY_VISITOR_EMAIL_LIMIT_BURST"}, Value: server.DefaultVisitorEmailLimitBurst, Usage: "initial limit of e-mails per visitor"}),
altsrc.NewDurationFlag(&cli.DurationFlag{Name: "visitor-email-limit-replenish", EnvVars: []string{"NTFY_VISITOR_EMAIL_LIMIT_REPLENISH"}, Value: server.DefaultVisitorEmailLimitReplenish, Usage: "interval at which burst limit is replenished (one per x)"}),
altsrc.NewBoolFlag(&cli.BoolFlag{Name: "behind-proxy", Aliases: []string{"P"}, EnvVars: []string{"NTFY_BEHIND_PROXY"}, Value: false, Usage: "if set, use X-Forwarded-For header to determine visitor IP address (for rate limiting)"}),
@ -104,6 +106,7 @@ func execServe(c *cli.Context) error {
visitorAttachmentDailyBandwidthLimitStr := c.String("visitor-attachment-daily-bandwidth-limit")
visitorRequestLimitBurst := c.Int("visitor-request-limit-burst")
visitorRequestLimitReplenish := c.Duration("visitor-request-limit-replenish")
visitorRequestLimitExemptHosts := util.SplitNoEmpty(c.String("visitor-request-limit-exempt-hosts"), ",")
visitorEmailLimitBurst := c.Int("visitor-email-limit-burst")
visitorEmailLimitReplenish := c.Duration("visitor-email-limit-replenish")
behindProxy := c.Bool("behind-proxy")
@ -164,6 +167,19 @@ func execServe(c *cli.Context) error {
return fmt.Errorf("config option visitor-attachment-daily-bandwidth-limit must be lower than %d", math.MaxInt)
}
// Resolve hosts
visitorRequestLimitExemptIPs := make([]string, 0)
for _, host := range visitorRequestLimitExemptHosts {
ips, err := net.LookupIP(host)
if err != nil {
log.Printf("cannot resolve host %s: %s, ignoring visitor request exemption", host, err.Error())
continue
}
for _, ip := range ips {
visitorRequestLimitExemptIPs = append(visitorRequestLimitExemptIPs, ip.String())
}
}
// Run server
conf := server.NewConfig()
conf.BaseURL = baseURL
@ -197,6 +213,7 @@ func execServe(c *cli.Context) error {
conf.VisitorAttachmentDailyBandwidthLimit = int(visitorAttachmentDailyBandwidthLimit)
conf.VisitorRequestLimitBurst = visitorRequestLimitBurst
conf.VisitorRequestLimitReplenish = visitorRequestLimitReplenish
conf.VisitorRequestExemptIPAddrs = visitorRequestLimitExemptIPs
conf.VisitorEmailLimitBurst = visitorEmailLimitBurst
conf.VisitorEmailLimitReplenish = visitorEmailLimitReplenish
conf.BehindProxy = behindProxy

2
server/config.go
View file

@ -83,6 +83,7 @@ type Config struct {
VisitorAttachmentDailyBandwidthLimit int
VisitorRequestLimitBurst int
VisitorRequestLimitReplenish time.Duration
VisitorRequestExemptIPAddrs []string
VisitorEmailLimitBurst int
VisitorEmailLimitReplenish time.Duration
BehindProxy bool
@ -120,6 +121,7 @@ func NewConfig() *Config {
VisitorAttachmentDailyBandwidthLimit: DefaultVisitorAttachmentDailyBandwidthLimit,
VisitorRequestLimitBurst: DefaultVisitorRequestLimitBurst,
VisitorRequestLimitReplenish: DefaultVisitorRequestLimitReplenish,
VisitorRequestExemptIPAddrs: make([]string, 0),
VisitorEmailLimitBurst: DefaultVisitorEmailLimitBurst,
VisitorEmailLimitReplenish: DefaultVisitorEmailLimitReplenish,
BehindProxy: false,

18
server/server.go
View file

@ -251,16 +251,17 @@ func (s *Server) Stop() {
}
func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
if err := s.handleInternal(w, r); err != nil {
v := s.visitor(r)
if err := s.handleInternal(w, r, v); err != nil {
if websocket.IsWebSocketUpgrade(r) {
log.Printf("[%s] WS %s %s - %s", r.RemoteAddr, r.Method, r.URL.Path, err.Error())
log.Printf("[%s] WS %s %s - %s", v.ip, r.Method, r.URL.Path, err.Error())
return // Do not attempt to write to upgraded connection
}
httpErr, ok := err.(*errHTTP)
if !ok {
httpErr = errHTTPInternalError
}
log.Printf("[%s] HTTP %s %s - %d - %d - %s", r.RemoteAddr, r.Method, r.URL.Path, httpErr.HTTPCode, httpErr.Code, err.Error())
log.Printf("[%s] HTTP %s %s - %d - %d - %s", v.ip, r.Method, r.URL.Path, httpErr.HTTPCode, httpErr.Code, err.Error())
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.WriteHeader(httpErr.HTTPCode)
@ -268,8 +269,7 @@ func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
}
}
func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request) error {
v := s.visitor(r)
func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request, v *visitor) error {
if r.Method == http.MethodGet && r.URL.Path == "/" {
return s.handleHome(w, r)
} else if r.Method == http.MethodGet && r.URL.Path == "/example.html" {
@ -404,14 +404,14 @@ func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, v *visito
if s.firebase != nil && firebase && !delayed {
go func() {
if err := s.firebase(m); err != nil {
log.Printf("Unable to publish to Firebase: %v", err.Error())
log.Printf("[%s] FB - Unable to publish to Firebase: %v", v.ip, err.Error())
}
}()
}
if s.mailer != nil && email != "" && !delayed {
go func() {
if err := s.mailer.Send(v.ip, email, m); err != nil {
log.Printf("Unable to send email: %v", err.Error())
log.Printf("[%s] MAIL - Unable to send email: %v", v.ip, err.Error())
}
}()
}
@ -1063,7 +1063,9 @@ func (s *Server) sendDelayedMessages() error {
func (s *Server) limitRequests(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
if err := v.RequestAllowed(); err != nil {
if util.InStringList(s.config.VisitorRequestExemptIPAddrs, v.ip) {
return next(w, r, v)
} else if err := v.RequestAllowed(); err != nil {
return errHTTPTooManyRequestsLimitRequests
}
return next(w, r, v)