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Rate limiting changes (#2519)

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* Rate limiting changes

This makes the following changes:

* For logged in users, the rate limiting now applies to the device session rather than the remote IP address;
* For non-logged in users, the rate limiting continues to apply to remote address as it does today;
* It is now possible to add user IDs to the `exempt_user_ids` option under `rate_limiting` to exclude bots from rate limiting;
* Admin and appservice users are now exempt from rate limiting by default.

* Fix build with media API
This commit is contained in:
Neil Alexander 2022-06-07 14:24:04 +01:00 committed by GitHub
parent 27948fb304
commit 6d4bd5d890
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 67 additions and 34 deletions
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50
clientapi/routing/routing.go
View file

@ -140,7 +140,7 @@ func Setup(
synapseAdminRouter.Handle("/admin/v1/send_server_notice/{txnID}",
httputil.MakeAuthAPI("send_server_notice", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
// not specced, but ensure we're rate limiting requests to this endpoint
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -160,7 +160,7 @@ func Setup(
synapseAdminRouter.Handle("/admin/v1/send_server_notice",
httputil.MakeAuthAPI("send_server_notice", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
// not specced, but ensure we're rate limiting requests to this endpoint
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return SendServerNotice(
@ -190,7 +190,7 @@ func Setup(
).Methods(http.MethodPost, http.MethodOptions)
v3mux.Handle("/join/{roomIDOrAlias}",
httputil.MakeAuthAPI(gomatrixserverlib.Join, userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -206,7 +206,7 @@ func Setup(
if mscCfg.Enabled("msc2753") {
v3mux.Handle("/peek/{roomIDOrAlias}",
httputil.MakeAuthAPI(gomatrixserverlib.Peek, userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -226,7 +226,7 @@ func Setup(
).Methods(http.MethodGet, http.MethodOptions)
v3mux.Handle("/rooms/{roomID}/join",
httputil.MakeAuthAPI(gomatrixserverlib.Join, userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -240,7 +240,7 @@ func Setup(
).Methods(http.MethodPost, http.MethodOptions)
v3mux.Handle("/rooms/{roomID}/leave",
httputil.MakeAuthAPI("membership", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -274,7 +274,7 @@ func Setup(
).Methods(http.MethodPost, http.MethodOptions)
v3mux.Handle("/rooms/{roomID}/invite",
httputil.MakeAuthAPI("membership", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -392,14 +392,14 @@ func Setup(
).Methods(http.MethodPut, http.MethodOptions)
v3mux.Handle("/register", httputil.MakeExternalAPI("register", func(req *http.Request) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, nil); r != nil {
return *r
}
return Register(req, userAPI, cfg)
})).Methods(http.MethodPost, http.MethodOptions)
v3mux.Handle("/register/available", httputil.MakeExternalAPI("registerAvailable", func(req *http.Request) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, nil); r != nil {
return *r
}
return RegisterAvailable(req, cfg, userAPI)
@ -473,7 +473,7 @@ func Setup(
v3mux.Handle("/rooms/{roomID}/typing/{userID}",
httputil.MakeAuthAPI("rooms_typing", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -530,7 +530,7 @@ func Setup(
v3mux.Handle("/account/whoami",
httputil.MakeAuthAPI("whoami", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return Whoami(req, device)
@ -539,7 +539,7 @@ func Setup(
v3mux.Handle("/account/password",
httputil.MakeAuthAPI("password", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return Password(req, userAPI, device, cfg)
@ -548,7 +548,7 @@ func Setup(
v3mux.Handle("/account/deactivate",
httputil.MakeAuthAPI("deactivate", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return Deactivate(req, userInteractiveAuth, userAPI, device)
@ -559,7 +559,7 @@ func Setup(
v3mux.Handle("/login",
httputil.MakeExternalAPI("login", func(req *http.Request) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, nil); r != nil {
return *r
}
return Login(req, userAPI, cfg)
@ -667,7 +667,7 @@ func Setup(
v3mux.Handle("/pushrules/{scope}/{kind}/{ruleID}",
httputil.MakeAuthAPI("push_rules", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -733,7 +733,7 @@ func Setup(
v3mux.Handle("/profile/{userID}/avatar_url",
httputil.MakeAuthAPI("profile_avatar_url", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -758,7 +758,7 @@ func Setup(
v3mux.Handle("/profile/{userID}/displayname",
httputil.MakeAuthAPI("profile_displayname", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -797,7 +797,7 @@ func Setup(
v3mux.Handle("/voip/turnServer",
httputil.MakeAuthAPI("turn_server", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return RequestTurnServer(req, device, cfg)
@ -876,7 +876,7 @@ func Setup(
v3mux.Handle("/user/{userID}/openid/request_token",
httputil.MakeAuthAPI("openid_request_token", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -889,7 +889,7 @@ func Setup(
v3mux.Handle("/user_directory/search",
httputil.MakeAuthAPI("userdirectory_search", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
postContent := struct {
@ -935,7 +935,7 @@ func Setup(
v3mux.Handle("/rooms/{roomID}/read_markers",
httputil.MakeAuthAPI("rooms_read_markers", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -948,7 +948,7 @@ func Setup(
v3mux.Handle("/rooms/{roomID}/forget",
httputil.MakeAuthAPI("rooms_forget", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
@ -1025,7 +1025,7 @@ func Setup(
v3mux.Handle("/pushers/set",
httputil.MakeAuthAPI("set_pushers", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return SetPusher(req, device, userAPI)
@ -1083,7 +1083,7 @@ func Setup(
v3mux.Handle("/capabilities",
httputil.MakeAuthAPI("capabilities", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
return GetCapabilities(req, rsAPI)
@ -1299,7 +1299,7 @@ func Setup(
).Methods(http.MethodPost, http.MethodOptions)
v3mux.Handle("/rooms/{roomId}/receipt/{receiptType}/{eventId}",
httputil.MakeAuthAPI(gomatrixserverlib.Join, userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))

5
dendrite-sample.monolith.yaml
View file

@ -160,11 +160,14 @@ client_api:
# Settings for rate-limited endpoints. Rate limiting kicks in after the threshold
# number of "slots" have been taken by requests from a specific host. Each "slot"
# will be released after the cooloff time in milliseconds.
# will be released after the cooloff time in milliseconds. Server administrators
# and appservice users are exempt from rate limiting by default.
rate_limiting:
enabled: true
threshold: 5
cooloff_ms: 500
exempt_user_ids:
# - @user:domain.com
# Configuration for the Federation API.
federation_api:

5
dendrite-sample.polylith.yaml
View file

@ -163,11 +163,14 @@ client_api:
# Settings for rate-limited endpoints. Rate limiting kicks in after the threshold
# number of "slots" have been taken by requests from a specific host. Each "slot"
# will be released after the cooloff time in milliseconds.
# will be released after the cooloff time in milliseconds. Server administrators
# and appservice users are exempt from rate limiting by default.
rate_limiting:
enabled: true
threshold: 5
cooloff_ms: 500
exempt_user_ids:
# - @user:domain.com
# Configuration for the Federation API.
federation_api:

31
internal/httputil/rate_limiting.go
View file

@ -7,6 +7,7 @@ import (
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/setup/config"
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/util"
)
@ -17,6 +18,7 @@ type RateLimits struct {
enabled bool
requestThreshold int64
cooloffDuration time.Duration
exemptUserIDs map[string]struct{}
}
func NewRateLimits(cfg *config.RateLimiting) *RateLimits {
@ -25,6 +27,10 @@ func NewRateLimits(cfg *config.RateLimiting) *RateLimits {
enabled: cfg.Enabled,
requestThreshold: cfg.Threshold,
cooloffDuration: time.Duration(cfg.CooloffMS) * time.Millisecond,
exemptUserIDs: map[string]struct{}{},
}
for _, userID := range cfg.ExemptUserIDs {
l.exemptUserIDs[userID] = struct{}{}
}
if l.enabled {
go l.clean()
@ -52,7 +58,7 @@ func (l *RateLimits) clean() {
}
}
func (l *RateLimits) Limit(req *http.Request) *util.JSONResponse {
func (l *RateLimits) Limit(req *http.Request, device *userapi.Device) *util.JSONResponse {
// If rate limiting is disabled then do nothing.
if !l.enabled {
return nil
@ -67,9 +73,26 @@ func (l *RateLimits) Limit(req *http.Request) *util.JSONResponse {
// First of all, work out if X-Forwarded-For was sent to us. If not
// then we'll just use the IP address of the caller.
caller := req.RemoteAddr
if forwardedFor := req.Header.Get("X-Forwarded-For"); forwardedFor != "" {
caller = forwardedFor
var caller string
if device != nil {
switch device.AccountType {
case userapi.AccountTypeAdmin:
return nil // don't rate-limit server administrators
case userapi.AccountTypeAppService:
return nil // don't rate-limit appservice users
default:
if _, ok := l.exemptUserIDs[device.UserID]; ok {
// If the user is exempt from rate limiting then do nothing.
return nil
}
caller = device.UserID + device.ID
}
} else {
if forwardedFor := req.Header.Get("X-Forwarded-For"); forwardedFor != "" {
caller = forwardedFor
} else {
caller = req.RemoteAddr
}
}
// Look up the caller's channel, if they have one.

6
mediaapi/routing/routing.go
View file

@ -62,7 +62,7 @@ func Setup(
uploadHandler := httputil.MakeAuthAPI(
"upload", userAPI,
func(req *http.Request, dev *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, dev); r != nil {
return *r
}
return Upload(req, cfg, dev, db, activeThumbnailGeneration)
@ -70,7 +70,7 @@ func Setup(
)
configHandler := httputil.MakeAuthAPI("config", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, device); r != nil {
return *r
}
respondSize := &cfg.MaxFileSizeBytes
@ -126,7 +126,7 @@ func makeDownloadAPI(
// Ratelimit requests
// NOTSPEC: The spec says everything at /media/ should be rate limited, but this causes issues with thumbnails (#2243)
if name != "thumbnail" {
if r := rateLimits.Limit(req); r != nil {
if r := rateLimits.Limit(req, nil); r != nil {
if err := json.NewEncoder(w).Encode(r); err != nil {
w.WriteHeader(http.StatusInternalServerError)
return

4
setup/config/config_clientapi.go
View file

@ -134,6 +134,10 @@ type RateLimiting struct {
// The cooloff period in milliseconds after a request before the "slot"
// is freed again
CooloffMS int64 `yaml:"cooloff_ms"`
// A list of users that are exempt from rate limiting, i.e. if you want
// to run Mjolnir or other bots.
ExemptUserIDs []string `yaml:"exempt_user_ids"`
}
func (r *RateLimiting) Verify(configErrs *ConfigErrors) {