Merge pull request #25 from maxlerebourg/prepare-for-release-1.1.0

Update exemple traefik to version 2.9.1 and version of plugin 1.1.0 in exemples

.gitignore

@@ -1,2 +1,6 @@
 .idea/
 .DS_Store
+config
+db
+logs
+docker-compose.dev.yml

Makefile

@@ -18,3 +18,42 @@ vendor:
 
 clean:
 	rm -rf ./vendor
+
+run_dev:
+	docker-compose -f docker-compose.dev.yml up -d --remove-orphans
+
+run_local:
+	docker-compose -f docker-compose.local.yml up -d --remove-orphans
+
+run_behindproxy:
+	docker-compose -f exemples/behind-proxy/docker-compose.cloudflare.yml up -d --remove-orphans
+
+run:
+	docker-compose -f docker-compose.yml up -d --remove-orphans
+
+restart_dev:
+	docker-compose -f docker-compose.dev.yml restart
+
+restart_local:
+	docker-compose -f docker-compose.local.yml restart
+
+restart:
+	docker-compose -f docker-compose.yml restart
+
+show_logs:
+	docker-compose -f docker-compose.yml restart
+
+show_local_logs:
+	docker-compose -f docker-compose.local.yml logs -f
+
+show_dev_logs:
+	docker-compose -f docker-compose.dev.yml logs -f
+
+clean_all_docker:
+	docker-compose -f exemples/behind-proxy/docker-compose.cloudflare.yml down --remove-orphans
+	docker-compose -f docker-compose.local.yml down --remove-orphans
+	docker-compose -f docker-compose.yml down --remove-orphans
+
+show_metrics:
+	docker exec crowdsec cscli metrics
+

README.md

@@ -16,34 +16,45 @@ The crowdsec utility will provide the community blocklist which contains highly
 
 When used with crowdsec it will leverage the local API which will analyze traefik logs and take decisions on the requests made by users/bots. Malicious actors will be banned based on patterns against your website.
 
-There are 4 operating modes (CrowdsecMode) for this plugin:
+There are 3 operating modes (CrowdsecMode) for this plugin:
-- none -> If the client IP is on ban list, it will get a http code 403 response.
-    Otherwise, request will continue as usual. All request call the Crowdsec LAPI
 
-- live -> If the client IP is on ban list, it will get a http code 403 response.
+| Mode | Description |
-    Otherwise, request will continue as usual.
+|------|------|
-    The bouncer can leverage use of a local cache in order to reduce the number
+| none | If the client IP is on ban list, it will get a http code 403 response. Otherwise, request will continue as usual. All request call the Crowdsec LAPI |
-    of requests made to the Crowdsec LAPI. It will keep in cache the status for
+| live | If the client IP is on ban list, it will get a http code 403 response. Otherwise, request will continue as usual.    The bouncer can leverage use of a local cache in order to reduce the number of requests made to the Crowdsec LAPI. It will keep in cache the status for  each IP that makes queries. |
-    each IP that makes queries.
+| stream | Stream Streaming mode allows you to keep in the local cache only the Banned IPs, every requests that does not hit the cache is authorized. Every minute, the cache is updated with news from the Crowdsec LAPI. |
-
-- stream -> Stream Streaming mode allows you to keep in the local cache only the Banned IPs,
-    every requests that does not hit the cache is authorized.
-    Every minute, the cache is updated with news from the Crowdsec LAPI.
-
-- alone -> Streaming mode but the blacklisted IPs are fetched on the CAPI.
-    Every 2 hours, the cache is updated with news from the Crowdsec CAPI.
 
 The recommanded mode for performance is the streaming mode, decisions are updated every 60 sec by default and that's the only communication between traefik and crowdsec. Every requests that happens hits the cache for quick decisions.
 
 ## Usage
 
+To get started, use the `docker-compose.yml` file.
+
+You can run it with:
+```bash
+make run
+```
+
+### Note
+Each middleware in traefik has it's own data and is instanciated by service.
+This means if there are 10 services protected by the bouncer in streaming alone or live mode, the cache will be duplicated to all 10 services.
+This is because traefik does not allow plugins to store data locally that can be consummed.
+
+The synchronisation with the crowdsec service will happen also 10 times in the period selected.
+It should be taken into account when fixing this period so each middleware has time to sync data from crowdsec.
+
+At each start of synchronisation, the middleware will wait a random number of seconds to avoid simultaneous calls to crowdsec.
+
 ### Variables
 - Enabled
   - bool
   - enable the plugin
+- LogLevel
+  - string
+  - default: `INFO`, expected value are: `INFO`, `DEBUG`
 - CrowdsecMode
   - string
-  - default: `stream`, expected value are: `none`, `live`, `stream`, `alone`
+  - default: `live`, expected value are: `none`, `live`, `stream`
 - CrowdsecLapiScheme
   - string
   - default: `http`, expected value are: `http`, `https`
@@ -53,24 +64,23 @@ The recommanded mode for performance is the streaming mode, decisions are update
   - Crowdsec LAPI available on which host.
 - CrowdsecLapiKey
   - string
-  - Crowdsec LAPI generated key for the bouncer. 
+  - Crowdsec LAPI generated key for the bouncer : **must be unique by service**. 
-- CrowdsecCapiLogin
-  - string
-  - Used only in `alone` mode, login for Crowdsec CAPI
-- CrowdsecCapiPwd
-  - string
-  - Used only in `alone` mode, password for Crowdsec CAPI
-- CrowdsecCapiScenarios
-  - []string
-  - Used only in `alone` mode, login for Crowdsec CAPI
 - UpdateIntervalSeconds
   - int64
   - default: 60
-  - User only in `stream` mode, interval of time between fetching blacklisted IPs from LAPI
+  - Used only in `stream` mode, interval between fetching blacklisted IPs from LAPI
 - DefaultDecisionSeconds
   - int64
   - default: 60
-  - User only in `live` mode, decision duration of accepted IPs
+  - Used only in `live` mode, decision duration of accepted IPs
+- ForwardedHeadersTrustedIPs
+  - []string
+  - default: []
+  - List of IPs of trusted Proxies that are in front of traefik (ex: Cloudflare)
+- ForwardedHeadersCustomName
+  - string
+  - default: X-Forwarded-For
+  - Name of the header where the real IP of the client should be retrieved
 
 ### Configuration
 
@@ -113,21 +123,18 @@ http:
           enabled: false
           updateIntervalSeconds: 60
           defaultDecisionSeconds: 60
-          crowdsecMode: stream
+          crowdsecMode: live
           crowdsecLapiKey: privateKey
           crowdsecLapiHost: crowdsec:8080
           crowdsecLapiScheme: http
-          crowdsecCapiLogin: login
+          forwardedHeadersTrustedIPs: 
-          crowdsecCapiPwd: password
+            - 10.0.10.23/32
-          crowdsecCapiScenarios:
+            - 10.0.20.0/24
-            - scenario1
+          forwardedHeadersCustomName: X-Custom-Header
-            - scenario2
-            ...
-
 ```
-Except for the crowdsecLapiKey, crowdsecCapiLogin, crowdsecCapiPwd, crowdsecCapiScenarios, these are the default value of the plugin.
+These are the default values of the plugin except for LapiKey.
 
-#### Generate LAPI KEY (exept for `alone` mode)
+#### Generate LAPI KEY
 You need to generate a crowdsec API key for the LAPI.
 You can follow the documentation here: https://docs.crowdsec.net/docs/user_guides/lapi_mgmt/
 
@@ -156,36 +163,6 @@ You can then run all the containers:
 docker-compose up -d
 ```
 
-#### Generate CAPI credentials (only for `alone` mode)
-You need to create a crowdsec API credentials for the CAPI.
-You can follow the documentation here: https://docs.crowdsec.net/docs/central_api/intro
-
-```bash
-curl -X POST "https://api.crowdsec.net/v2/watchers" -H  "accept: application/json" -H  "Content-Type: application/json" -d "{ \"password\": \"PASSWORD\",  \"machine_id\": \"LOGIN\"}"
-```
-
-These CAPI credentials must be set in your docker-compose.yml or in your config files
-```yaml
-...
-traefik:
-  command:
-    ...
-    - "--experimental.plugins.bouncer.modulename=github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
-    - "--experimental.plugins.bouncer.version=v1.0.0"
-    ...
-whoami:
-  labels:
-    - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapilogin=LOGIN"
-    - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapipwd=PASSWORD"
-    - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapiscenarios=scenario1, scenario2, ..."
-    - "traefik.http.middlewares.crowdsec.plugin.bouncer.enabled=true"
-```
-
-You can then run all the containers:
-```bash
-docker-compose up -d
-```
-
 #### Add manually an IP to the blocklist (testing purpose)
 
 ```bash
@@ -223,10 +200,37 @@ For local developpement a docker-compose.local.yml is provided and reproduce the
 ```bash
 docker-compose -f docker-compose.local.yml up -d
 ```
+Equivalent to
+```bash
+make run_local
+```
+
+### Exemples
+
+1. Behind another proxy service (ex: clouflare)
+
+You need to configure your Traefik to trust Forwarded headers by your front proxy
+In the exemple we use another instance of traefik with the container named cloudflare to simulate a front proxy
+
+The "internal" Traefik instance is configured to trust the cloudflare forward headers
+```yaml
+  - "--entrypoints.web.forwardedheaders.trustedips=172.21.0.5"
+```
+
+We configure the middleware to trust as well the IP:
+```yaml
+    - "traefik.http.middlewares.crowdsec1.plugin.bouncer.forwardedheaderstrustedips=172.21.0.5"
+```
+
+To run the environnement run:
+```bash
+make run_behind_proxy
+```
+
 
 ### About
 
-Me and [mhanotaux](https://github.com/mhanotaux) have been using traefik since 2020 at [Primadviz](https://primadviz.com).
+Me and [mathieuHa](https://github.com/mathieuHa) have been using traefik since 2020 at [Primadviz](https://primadviz.com).
 We come from web developper and security engineer background and wanted to add the power of a very promesing technology (Crowdsec) into the edge router we love.
 
 We initially run into this project: https://github.com/fbonalair/traefik-crowdsec-bouncer

acquis.yaml

@@ -1,4 +1,4 @@
 filenames:
- - /var/log/traefik/*.log
+ - /var/log/traefik/access.log
 labels:
   type: traefik

bouncer.go

@@ -7,106 +7,106 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
-	"net"
 	"net/http"
 	"net/url"
-	"strings"
 	"text/template"
 	"time"
 
-	ttl_map "github.com/leprosus/golang-ttl-map"
+	cache "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/pkg/cache"
+	ip "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/pkg/ip"
+	logger "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/pkg/logger"
 )
 
 const (
-	aloneMode               = "alone"
 	streamMode              = "stream"
 	liveMode                = "live"
 	noneMode                = "none"
 	crowdsecLapiHeader      = "X-Api-Key"
-	crowdsecCapiHeader      = "Authorization"
 	crowdsecLapiRoute       = "v1/decisions"
 	crowdsecLapiStreamRoute = "v1/decisions/stream"
-	crowdsecCapiLogin       = "v2/watchers/login"
+	cacheTimeoutKey         = "updated"
-	crowdsecCapiDecisions   = "v2/decisions/stream"
+)
-	cacheBannedValue        = "t"
+
-	cacheNoBannedValue      = "f"
+var (
+	crowdsecStreamHealthy = false
+	ticker                chan bool
 )
 
 // Config the plugin configuration.
 type Config struct {
 	Enabled                    bool     `json:"enabled,omitempty"`
+	LogLevel                   string   `json:"logLevel,omitempty"`
 	CrowdsecMode               string   `json:"crowdsecMode,omitempty"`
 	CrowdsecLapiScheme         string   `json:"crowdsecLapiScheme,omitempty"`
 	CrowdsecLapiHost           string   `json:"crowdsecLapiHost,omitempty"`
 	CrowdsecLapiKey            string   `json:"crowdsecLapiKey,omitempty"`
-	CrowdsecCapiLogin      string   `json:"crowdsecCapiLogin,omitempty"`
+	ForwardedHeadersCustomName string   `json:"forwardedheaderscustomheader,omitempty"`
-	CrowdsecCapiPwd        string   `json:"crowdsecCapiPwd,omitempty"`
-	CrowdsecCapiScenarios  []string `json:"crowdsecCapiScenarios,omitempty"`
 	UpdateIntervalSeconds      int64    `json:"updateIntervalSeconds,omitempty"`
 	DefaultDecisionSeconds     int64    `json:"defaultDecisionSeconds,omitempty"`
+	ForwardedHeadersTrustedIPs []string `json:"forwardedheaderstrustedips,omitempty"`
 }
 
 // CreateConfig creates the default plugin configuration.
 func CreateConfig() *Config {
 	return &Config{
 		Enabled:                    false,
-		CrowdsecMode:           streamMode,
+		LogLevel:                   "INFO",
+		CrowdsecMode:               liveMode,
 		CrowdsecLapiScheme:         "http",
 		CrowdsecLapiHost:           "crowdsec:8080",
 		CrowdsecLapiKey:            "",
-		CrowdsecCapiLogin:      "",
-		CrowdsecCapiPwd:        "",
-		CrowdsecCapiScenarios:  []string{},
 		UpdateIntervalSeconds:      60,
 		DefaultDecisionSeconds:     60,
+		ForwardedHeadersTrustedIPs: []string{},
+		ForwardedHeadersCustomName: "X-Forwarded-For",
 	}
 }
 
-// Bouncer a Bouncer plugin.
+// Bouncer a Bouncer struct.
 type Bouncer struct {
 	next     http.Handler
 	name     string
 	template *template.Template
 
 	enabled                bool
-	crowdsecStreamHealthy  bool
 	crowdsecScheme         string
 	crowdsecHost           string
 	crowdsecKey            string
 	crowdsecMode           string
 	updateInterval         int64
 	defaultDecisionTimeout int64
-	crowdsecLogin          string
+	customHeader           string
-	crowdsecPwd            string
+	poolStrategy           *ip.PoolStrategy
-	crowdsecScenarios      []string
 	client                 *http.Client
-	cache                  *ttl_map.Heap
 }
 
 // New creates the crowdsec bouncer plugin.
 func New(ctx context.Context, next http.Handler, config *Config, name string) (http.Handler, error) {
+	logger.Init(config.LogLevel)
 	err := validateParams(config)
-	if (err != nil) {
+	if err != nil {
+		logger.Info(fmt.Sprintf("%w", err))
 		return nil, err
 	}
 
+	checker, _ := ip.NewChecker(config.ForwardedHeadersTrustedIPs)
+
 	bouncer := &Bouncer{
 		next:     next,
 		name:     name,
 		template: template.New("CrowdsecBouncer").Delims("[[", "]]"),
 
 		enabled:                config.Enabled,
-		crowdsecStreamHealthy:  false,
 		crowdsecMode:           config.CrowdsecMode,
 		crowdsecScheme:         config.CrowdsecLapiScheme,
 		crowdsecHost:           config.CrowdsecLapiHost,
 		crowdsecKey:            config.CrowdsecLapiKey,
-		crowdsecLogin:          config.CrowdsecCapiLogin,
-		crowdsecPwd:            config.CrowdsecCapiPwd,
-		crowdsecScenarios:      config.CrowdsecCapiScenarios,
 		updateInterval:         config.UpdateIntervalSeconds,
+		customHeader:           config.ForwardedHeadersCustomName,
 		defaultDecisionTimeout: config.DefaultDecisionSeconds,
+		poolStrategy: &ip.PoolStrategy{
+			Checker: checker,
+		},
 		client: &http.Client{
 			Transport: &http.Transport{
 				MaxIdleConns:    10,
@@ -114,56 +114,57 @@ func New(ctx context.Context, next http.Handler, config *Config, name string) (h
 			},
 			Timeout: 5 * time.Second,
 		},
-		cache: ttl_map.New(),
 	}
-	// if we are on a stream mode, we fetch in a go routine every minute the new decisions.
 	if config.CrowdsecMode == streamMode {
-		go handleStreamCache(bouncer, true)
+		go func() {
-	} else if config.CrowdsecMode == aloneMode {
+			if ticker == nil {
-		getToken(bouncer)
+				go handleStreamCache(bouncer)
-		time.AfterFunc(10*time.Second, func() {
+				ticker = startTicker(config, func() {
-			handleStreamCache(bouncer, false)
+					handleStreamCache(bouncer)
 				})
 			}
+		}()
+	}
 	return bouncer, nil
 }
 
 // ServeHTTP principal function of plugin.
-func (a *Bouncer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+func (bouncer *Bouncer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	if !a.enabled {
+	if !bouncer.enabled {
-		a.next.ServeHTTP(rw, req)
+		bouncer.next.ServeHTTP(rw, req)
 		return
 	}
 
-	// TODO Make sur remote address does not include the port.
+	remoteHost, err := ip.GetRemoteIP(req, bouncer.poolStrategy, bouncer.customHeader)
-	remoteHost, _, err := net.SplitHostPort(req.RemoteAddr)
 	if err != nil {
-		log.Printf("failed to extract ip from remote address: %v", err)
+		logger.Info(fmt.Sprintf("%w", err))
-		a.next.ServeHTTP(rw, req)
+		bouncer.next.ServeHTTP(rw, req)
 		return
 	}
+	logger.Debug(fmt.Sprintf("ServeHTTP ip:%v", remoteHost))
 
-	if a.crowdsecMode == streamMode || a.crowdsecMode == liveMode {
+	if bouncer.crowdsecMode != noneMode {
-		isBanned, err := getDecision(a.cache, remoteHost)
+		isBanned, err := cache.GetDecision(remoteHost)
 		if err == nil {
+			logger.Debug(fmt.Sprintf("ServeHTTP cacheHit isBanned:%v", isBanned))
 			if isBanned {
 				rw.WriteHeader(http.StatusForbidden)
 			} else {
-				a.next.ServeHTTP(rw, req)
+				bouncer.next.ServeHTTP(rw, req)
 			}
 			return
 		}
 	}
 
 	// Right here if we cannot join the stream we forbid the request to go on.
-	if a.crowdsecMode == streamMode {
+	if bouncer.crowdsecMode == streamMode {
-		if a.crowdsecStreamHealthy {
+		if crowdsecStreamHealthy {
-			a.next.ServeHTTP(rw, req)
+			bouncer.next.ServeHTTP(rw, req)
 		} else {
 			rw.WriteHeader(http.StatusForbidden)
 		}
 	} else {
-		handleNoStreamCache(a, rw, req, remoteHost)
+		handleNoStreamCache(bouncer, rw, req, remoteHost)
 	}
 }
 
@@ -188,213 +189,148 @@ type Stream struct {
 	New     []Decision `json:"new"`
 }
 
-// Login Body returned from Crowdsec Login CAPI.
-type Login struct {
-	Code   int    `json:"code"`
-	Token  string `json:"token"`
-	Expire string `json:"expire"`
-}
-
 func contains(source []string, target string) bool {
-	for _, a := range source {
+	for _, item := range source {
-		if a == target {
+		if item == target {
 			return true
 		}
 	}
 	return false
 }
 
-// Get Decision check in the cache if the IP has the banned / not banned value.
+func startTicker(config *Config, work func()) chan bool {
-// Otherwise return with an error to add the IP in cache if we are on.
+	ticker := time.NewTicker(time.Duration(config.UpdateIntervalSeconds) * time.Second)
-func getDecision(cache *ttl_map.Heap, clientIP string) (bool, error) {
+	stop := make(chan bool, 1)
-	banned, isCached := cache.Get(clientIP)
+	go func() {
-	bannedString, isValid := banned.(string)
+		defer logger.Debug("ticker:stopped")
-	if isCached && isValid && len(bannedString) > 0 {
+		for {
-		return bannedString == cacheBannedValue, nil
+			select {
+			case <-ticker.C:
+				go work()
+			case <-stop:
+				return
 			}
-	return false, fmt.Errorf("no cache data")
+		}
+	}()
+	return stop
 }
 
-func setDecision(cache *ttl_map.Heap, clientIP string, isBanned bool, duration int64) {
-	if isBanned {
-		log.Printf("%v banned", clientIP)
-		cache.Set(clientIP, cacheBannedValue, duration)
-	} else {
-		cache.Set(clientIP, cacheNoBannedValue, duration)
-	}
-}
-
-func handleNoStreamCache(a *Bouncer, rw http.ResponseWriter, req *http.Request, remoteHost string) {
 // We are now in none or live mode.
+func handleNoStreamCache(bouncer *Bouncer, rw http.ResponseWriter, req *http.Request, remoteHost string) {
 	routeURL := url.URL{
-		Scheme:   a.crowdsecScheme,
+		Scheme:   bouncer.crowdsecScheme,
-		Host:     a.crowdsecHost,
+		Host:     bouncer.crowdsecHost,
 		Path:     crowdsecLapiRoute,
 		RawQuery: fmt.Sprintf("ip=%v&banned=true", remoteHost),
 	}
-	body := crowdsecQuery(a, routeURL.String(), false)
+	body, err := crowdsecQuery(bouncer, routeURL.String())
+	if err != nil {
+		logger.Info(fmt.Sprintf("%w", err))
+		rw.WriteHeader(http.StatusForbidden)
+		return
+	}
 
 	if bytes.Equal(body, []byte("null")) {
-		if a.crowdsecMode == liveMode {
+		if bouncer.crowdsecMode == liveMode {
-			setDecision(a.cache, remoteHost, false, a.defaultDecisionTimeout)
+			cache.SetDecision(remoteHost, false, bouncer.defaultDecisionTimeout)
 		}
-		a.next.ServeHTTP(rw, req)
+		bouncer.next.ServeHTTP(rw, req)
 		return
 	}
 
 	var decisions []Decision
-	err := json.Unmarshal(body, &decisions)
+	err = json.Unmarshal(body, &decisions)
 	if err != nil {
-		log.Printf("failed to parse body: %s", err)
+		logger.Info(fmt.Sprintf("failed to parse body: %s", err))
 		rw.WriteHeader(http.StatusForbidden)
 		return
 	}
 	if len(decisions) == 0 {
-		if a.crowdsecMode == liveMode {
+		if bouncer.crowdsecMode == liveMode {
-			setDecision(a.cache, remoteHost, false, a.defaultDecisionTimeout)
+			cache.SetDecision(remoteHost, false, bouncer.defaultDecisionTimeout)
 		}
-		a.next.ServeHTTP(rw, req)
+		bouncer.next.ServeHTTP(rw, req)
 		return
 	}
 	rw.WriteHeader(http.StatusForbidden)
 	duration, err := time.ParseDuration(decisions[0].Duration)
 	if err != nil {
-		log.Printf("failed to parse duration: %s", err)
+		logger.Info(fmt.Sprintf("failed to parse duration: %s", err))
 		return
 	}
-	setDecision(a.cache, remoteHost, true, int64(duration.Seconds()))
+	if bouncer.crowdsecMode == liveMode {
+		cache.SetDecision(remoteHost, true, int64(duration.Seconds()))
+	}
 }
 
-func handleStreamCache(a *Bouncer, initialized bool) {
+func handleStreamCache(bouncer *Bouncer) {
 	// TODO clean properly on exit.
-	time.AfterFunc(time.Duration(a.updateInterval)*time.Second, func() {
+	// Instead of blocking the goroutine interval for all the secondary node,
-		handleStreamCache(a, false)
+	// if the master service is shut down, other goroutine can take the lead
-	})
+	// because updated routine information is in the cache
-	var rawQuery string
+	logger.Debug("handleStreamCache")
-	var path string
+	_, err := cache.GetDecision(cacheTimeoutKey)
-	if a.crowdsecMode == aloneMode {
+	if err == nil {
-		rawQuery = ""
+		return
-		path = crowdsecCapiDecisions
-	} else {
-		rawQuery = fmt.Sprintf("startup=%t", initialized)
-		path = crowdsecLapiStreamRoute
 	}
+	cache.SetDecision(cacheTimeoutKey, false, bouncer.updateInterval-1)
 	streamRouteURL := url.URL{
-		Scheme:   a.crowdsecScheme,
+		Scheme:   bouncer.crowdsecScheme,
-		Host:     a.crowdsecHost,
+		Host:     bouncer.crowdsecHost,
-		Path:     path,
+		Path:     crowdsecLapiStreamRoute,
-		RawQuery: rawQuery,
+		RawQuery: fmt.Sprintf("startup=%t", !crowdsecStreamHealthy),
 	}
-	body := crowdsecQuery(a, streamRouteURL.String(), false)
+	body, err := crowdsecQuery(bouncer, streamRouteURL.String())
-	var stream Stream
-	err := json.Unmarshal(body, &stream)
 	if err != nil {
-		log.Printf("error while parsing body: %s", err)
+		logger.Info(fmt.Sprintf("%w", err))
-		a.crowdsecStreamHealthy = false
+		crowdsecStreamHealthy = false
+		return
+	}
+	var stream Stream
+	err = json.Unmarshal(body, &stream)
+	if err != nil {
+		logger.Info(fmt.Sprintf("error while parsing body: %s", err))
+		crowdsecStreamHealthy = false
 		return
 	}
 	for _, decision := range stream.New {
 		duration, err := time.ParseDuration(decision.Duration)
 		if err == nil {
-			setDecision(a.cache, decision.Value, true, int64(duration.Seconds()))
+			cache.SetDecision(decision.Value, true, int64(duration.Seconds()))
 		}
 	}
 	for _, decision := range stream.Deleted {
-		a.cache.Del(decision.Value)
+		cache.DeleteDecision(decision.Value)
 	}
-	a.crowdsecStreamHealthy = true
+	crowdsecStreamHealthy = true
 }
 
-func getToken(a *Bouncer) {
+func crowdsecQuery(bouncer *Bouncer, stringURL string) ([]byte, error) {
-	loginURL := url.URL{
-		Scheme: a.crowdsecScheme,
-		Host:   a.crowdsecHost,
-		Path:   crowdsecCapiLogin,
-	}
-	body := crowdsecQuery(a, loginURL.String(), true)
-	var login Login
-	err := json.Unmarshal(body, &login)
-	if err != nil {
-		log.Printf("error while parsing body: %s", err)
-		a.crowdsecStreamHealthy = false
-		return
-	}
-	if login.Code == 200 && len(login.Token) > 0 {
-		a.crowdsecKey = login.Token
-	}
-}
-
-func crowdsecQuery(a *Bouncer, stringURL string, isPost bool) []byte {
 	var req *http.Request
-	if isPost {
-		data := []byte(fmt.Sprintf(
-			`{"machine_id": "%v","password": "%v","scenarios": ["%v"]}`,
-			a.crowdsecLogin,
-			a.crowdsecPwd,
-			strings.Join(a.crowdsecScenarios, `","`),
-		))
-		req, _ = http.NewRequest(http.MethodPost, stringURL, bytes.NewBuffer(data))
-	} else {
 	req, _ = http.NewRequest(http.MethodGet, stringURL, nil)
-	}
+	req.Header.Add(crowdsecLapiHeader, bouncer.crowdsecKey)
-	if a.crowdsecMode == aloneMode {
+	res, err := bouncer.client.Do(req)
-		req.Header.Add(crowdsecCapiHeader, a.crowdsecKey)
-	} else {
-		req.Header.Add(crowdsecLapiHeader, a.crowdsecKey)
-	}
-	res, err := a.client.Do(req)
 	if err != nil {
-		log.Printf("error while fetching %v: %s", stringURL, err)
+		return nil, fmt.Errorf("error while fetching %v: %s", stringURL, err)
-		a.crowdsecStreamHealthy = false
-		return nil
-	}
-	if res.StatusCode == http.StatusUnauthorized && a.crowdsecMode == aloneMode {
-		oldToken := a.crowdsecKey
-		getToken(a)
-		if oldToken == a.crowdsecKey {
-			a.crowdsecStreamHealthy = false
-			return nil
-		}
-		return crowdsecQuery(a, stringURL, false)
 	}
 	if res.StatusCode != http.StatusOK {
-		log.Printf("error while fetching %v, status code: %d", stringURL, res.StatusCode)
+		return nil, fmt.Errorf("error while fetching %v, status code: %d", stringURL, res.StatusCode)
-		a.crowdsecStreamHealthy = false
-		return nil
 	}
 	defer func(body io.ReadCloser) {
 		err = body.Close()
 		if err != nil {
-			log.Printf("failed to close body reader: %s", err)
+			logger.Info(fmt.Sprintf("failed to close body reader: %s", err))
 		}
 	}(res.Body)
 	body, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		log.Printf("error while reading body: %s", err)
+		return nil, fmt.Errorf("error while reading body: %s", err)
-		a.crowdsecStreamHealthy = false
-		return nil
 	}
-	return body
+	return body, nil
 }
 
 func validateParams(config *Config) error {
-	var requiredStrings map[string]string
+	requiredStrings := map[string]string{
-	if config.CrowdsecMode == aloneMode {
-		requiredStrings = map[string]string{
-			"CrowdsecCapiLogin": config.CrowdsecLapiScheme,
-			"CrowdsecCapiPwd":   config.CrowdsecLapiHost,
-		}
-		for _, val := range config.CrowdsecCapiScenarios {
-			if len(val) == 0 {
-				return fmt.Errorf("CrowdsecCapiScenarios: one or more scenario are empty")
-			}
-		}
-		config.UpdateIntervalSeconds = 7200
-		config.CrowdsecLapiKey = ""
-		config.CrowdsecLapiScheme = "https"
-		config.CrowdsecLapiHost = "api.crowdsec.net"
-	} else {
-		requiredStrings = map[string]string{
 		"CrowdsecLapiScheme": config.CrowdsecLapiScheme,
 		"CrowdsecLapiHost":   config.CrowdsecLapiHost,
 		"CrowdsecLapiKey":    config.CrowdsecLapiKey,
@@ -409,13 +345,12 @@ func validateParams(config *Config) error {
 			return fmt.Errorf("%v: cannot be less than 1", key)
 		}
 	}
-	}
 	for key, val := range requiredStrings {
 		if len(val) == 0 {
 			return fmt.Errorf("%v: cannot be empty", key)
 		}
 	}
-	if !contains([]string{noneMode, liveMode, streamMode, aloneMode}, config.CrowdsecMode) {
+	if !contains([]string{noneMode, liveMode, streamMode}, config.CrowdsecMode) {
 		return fmt.Errorf("CrowdsecMode: must be one of 'none', 'live' or 'stream'")
 	}
 	if !contains([]string{"http", "https"}, config.CrowdsecLapiScheme) {
@@ -429,5 +364,14 @@ func validateParams(config *Config) error {
 	if err != nil {
 		return fmt.Errorf("CrowdsecLapiScheme://CrowdsecLapiHost: '%v://%v' must be an URL", config.CrowdsecLapiScheme, config.CrowdsecLapiHost)
 	}
+	if len(config.ForwardedHeadersTrustedIPs) > 0 {
+		_, err = ip.NewChecker(config.ForwardedHeadersTrustedIPs)
+		if err != nil {
+			return fmt.Errorf("ForwardedHeadersTrustedIPs must be a list of IP/CIDR :%w", err)
+		}
+	} else {
+		logger.Debug("No IP provided for ForwardedHeadersTrustedIPs")
+	}
+
 	return nil
 }

bouncer_test.go

@@ -1,22 +1,20 @@
-package crowdsec_bouncer_traefik_plugin_test
+package crowdsec_bouncer_traefik_plugin
 
 import (
 	"context"
 	"net/http"
 	"net/http/httptest"
 	"testing"
-
-	crowdsec_bouncer_traefik_plugin "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
 )
 
 func TestCrowdSec(t *testing.T) {
-	cfg := crowdsec_bouncer_traefik_plugin.CreateConfig()
+	cfg := CreateConfig()
-	cfg.CrowdsecLapiKey = "caca"
+	cfg.CrowdsecLapiKey = "test"
 
 	ctx := context.Background()
 	next := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})
 
-	handler, err := crowdsec_bouncer_traefik_plugin.New(ctx, next, cfg, "demo-plugin")
+	handler, err := New(ctx, next, cfg, "demo-plugin")
 	if err != nil {
 		t.Fatal(err)
 	}

docker-compose.local.yml

@@ -2,12 +2,12 @@ version: "3.8"
 
 services:
   traefik:
-    image: "traefik:v2.8.7"
+    image: "traefik:v2.9.1"
     container_name: "traefik"
     command:
       # - "--log.level=DEBUG"
       - "--accesslog"
-      - "--accesslog.filepath=/var/log/traefik/traefik.log"
+      - "--accesslog.filepath=/var/log/traefik/access.log"
       - "--api.insecure=true"
       - "--providers.docker=true"
       - "--providers.docker.exposedbydefault=false"
@@ -15,44 +15,57 @@ services:
 
       - "--experimental.localplugins.bouncer.modulename=github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
     volumes:
-      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+      - /var/run/docker.sock:/var/run/docker.sock:ro
-      - "logs:/var/log/traefik"
+      - logs-local:/var/log/traefik
       - ./:/plugins-local/src/github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin
     ports:
-      - 8000:80
+      - 80:80
       - 8080:8080
     depends_on:
-      - 'crowdsec'
+      - crowdsec
 
-  whoami:
+  whoami1:
     image: traefik/whoami
-    container_name: "simple-service"
+    container_name: "simple-service1"
     labels:
       - "traefik.enable=true"
-      - "traefik.http.routers.whoami.rule=Host(`localhost`)"
+      - "traefik.http.routers.router1.rule=Host(`localhost`) && Path(`/foo`)"
-      - "traefik.http.routers.whoami.entrypoints=web"
+      - "traefik.http.routers.router1.entrypoints=web"
-      - "traefik.http.routers.whoami.middlewares=crowdsec@docker"
+      - "traefik.http.routers.router1.middlewares=crowdsec1@docker" 
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.enabled=true"
+      - "traefik.http.services.service1.loadbalancer.server.port=80"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseclapikey=40796d93c2958f9e58345514e67740e5"
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.enabled=true"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapilogin=3829a6c9870e4726a377d8951ebb64a1m8psGvMaq1ykJ3zX"
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.crowdseclapikey=40796d93c2958f9e58345514e67740e5"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapipwd=Q5pgN8bRNInHGdx6QCksdPOJVLeLQ7ipJntSeuP3r8088zXzRVs4G8liXAKfI1k6"
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.forwardedheaderstrustedips=172.26.0.5"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseccapiscenarios=crowdsecurity/http-backdoors-attempts,baudneo/zoneminder-bf"
+
+  whoami2:
+    image: traefik/whoami
+    container_name: "simple-service2"
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.router2.rule=Host(`localhost`) && Path(`/bar`)"
+      - "traefik.http.routers.router2.entrypoints=web"
+      - "traefik.http.routers.router2.middlewares=crowdsec2@docker"
+      - "traefik.http.services.service2.loadbalancer.server.port=80"
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.enabled=true"
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.crowdseclapikey=44c36dac5c4140af9f06f397508e82c7"
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.forwardedheaderstrustedips=172.26.0.5"
 
   crowdsec:
     image: crowdsecurity/crowdsec:v1.4.1
     container_name: "crowdsec"
-    command: rm -rf /etc/crowdsec/acquis.yaml
     environment:
       COLLECTIONS: crowdsecurity/traefik
       CUSTOM_HOSTNAME: crowdsec
-      BOUNCER_KEY_TRAEFIK: 40796d93c2958f9e58345514e67740e5
+      BOUNCER_KEY_TRAEFIK_1: 40796d93c2958f9e58345514e67740e5
+      BOUNCER_KEY_TRAEFIK_2: 44c36dac5c4140af9f06f397508e82c7
     volumes:
       - ./acquis.yaml:/etc/crowdsec/acquis.yaml:ro
-      - logs:/var/log/traefik:ro
+      - logs-local:/var/log/traefik:ro
-      - crowdsec-db:/var/lib/crowdsec/data/
+      - crowdsec-db-local:/var/lib/crowdsec/data/
-      - crowdsec-config:/etc/crowdsec/
+      - crowdsec-config-local:/etc/crowdsec/
-
+    labels:
+      - "traefik.enable=false"
 volumes:
-  logs:
+  logs-local:
-  crowdsec-db:
+  crowdsec-db-local:
-  crowdsec-config:
+  crowdsec-config-local:

docker-compose.yml

@@ -2,18 +2,18 @@ version: "3.8"
 
 services:
   traefik:
-    image: "traefik:v2.8.7"
+    image: "traefik:v2.9.1"
     container_name: "traefik"
     command:
-      # - "--log.level=DEBUG"
       - "--accesslog"
-      - "--accesslog.filepath=/var/log/traefik/traefik.log"
+      - "--accesslog.filepath=/var/log/traefik/access.log"
       - "--api.insecure=true"
       - "--providers.docker=true"
       - "--providers.docker.exposedbydefault=false"
       - "--entrypoints.web.address=:80"
 
       - "--experimental.plugins.bouncer.modulename=github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
+      - "--experimental.plugins.bouncer.version=v1.1.0"
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock:ro"
       - "logs:/var/log/traefik"
@@ -23,30 +23,58 @@ services:
     depends_on:
       - 'crowdsec'
 
-  whoami:
+  whoami1:
     image: traefik/whoami
-    container_name: "simple-service"
+    container_name: "simple-service-1"
     labels:
       - "traefik.enable=true"
-      - "traefik.http.routers.whoami.rule=Host(`localhost`)"
+      # Definition of the router
-      - "traefik.http.routers.whoami.entrypoints=web"
+      - "traefik.http.routers.router1.rule=Host(`localhost`) && Path(`/foo`)"
-      - "traefik.http.routers.whoami.middlewares=crowdsec@docker"
+      - "traefik.http.routers.router1.entrypoints=web"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.enabled=true"
+      - "traefik.http.routers.router1.middlewares=crowdsec2@docker"
-      - "traefik.http.middlewares.crowdsec.plugin.bouncer.crowdseclapikey=FIXME-LAPI-KEY"
+      # Definition of the service
+      - "traefik.http.services.service1.loadbalancer.server.port=80"
+      # Definition of the middleware
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.enabled=true"
+      # crowdseclapikey must be unique to the middleware attached to the service
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.crowdseclapikey=FIXME-LAPI-KEY-1"
+      # forwardedheaderstrustedips should be the IP of the proxy that is in front of traefik (if any)
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.forwardedheaderstrustedips=172.21.0.5"
+  
+  whoami2:
+    image: traefik/whoami
+    container_name: "simple-service-2"
+    labels:
+      - "traefik.enable=true"
+      # Definition of the router
+      - "traefik.http.routers.router2.rule=Host(`localhost`) && Path(`/bar`)"
+      - "traefik.http.routers.router2.entrypoints=web"
+      - "traefik.http.routers.router2.middlewares=crowdsec2@docker"
+      # Definition of the service
+      - "traefik.http.services.service2.loadbalancer.server.port=80"
+      # Definitin of the middleware
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.enabled=true"
+      # crowdseclapikey must be unique to the middleware attached to the service
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.crowdseclapikey=FIXME-LAPI-KEY-2"
+      # forwardedheaderstrustedips should be the IP of the proxy that is in front of traefik (if any)
+      - "traefik.http.middlewares.crowdsec2.plugin.bouncer.forwardedheaderstrustedips=172.21.0.5"
 
   crowdsec:
     image: crowdsecurity/crowdsec:v1.4.1
     container_name: "crowdsec"
-    command: rm -rf /etc/crowdsec/acquis.yaml
     environment:
       COLLECTIONS: crowdsecurity/traefik
       CUSTOM_HOSTNAME: crowdsec
-      BOUNCER_KEY_TRAEFIK: FIXME-LAPI-KEY
+      # We need to register one api key per service we will use
+      BOUNCER_KEY_TRAEFIK_1: FIXME-LAPI-KEY-1
+      BOUNCER_KEY_TRAEFIK_2: FIXME-LAPI-KEY-2
     volumes:
       - ./acquis.yaml:/etc/crowdsec/acquis.yaml:ro
       - logs:/var/log/traefik:ro
       - crowdsec-db:/var/lib/crowdsec/data/
       - crowdsec-config:/etc/crowdsec/
+    labels:
+      - "traefik.enable=false"
 
 volumes:
   logs:

exemples/behind-proxy/acquis.yaml

@@ -0,0 +1,4 @@
+filenames:
+ - /var/log/traefik/access.log
+labels:
+  type: traefik

exemples/behind-proxy/cloudflare-exemple.yaml

@@ -0,0 +1,15 @@
+http:
+  # Add the router
+  routers:
+    router0:
+      entryPoints:
+      - web
+      service: service-foo
+      rule: Path(`/foo`)
+
+  # Add the service
+  services:
+    service-foo:
+      loadBalancer:
+        servers:
+        - url: http://traefik/foo:80

exemples/behind-proxy/docker-compose.cloudflare.yml

@@ -0,0 +1,86 @@
+version: "3.8"
+
+services:
+  cloudflare:
+    image: "traefik:v2.9.1"
+    container_name: "cloudflare"
+    command:
+      # - "--log.level=DEBUG"
+      - "--accesslog"
+      - "--accesslog.filepath=/var/log/traefik/access.log"
+      - "--api.insecure=true"
+      - "--entrypoints.web.address=:80"
+      - "--providers.file.filename=/cloud.yaml"
+      - "--experimental.localplugins.bouncer.modulename=github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ./cloudflare-exemple.yaml:/cloud.yaml:ro
+      - logs-cloudflare:/var/log/traefik
+    ports:
+      - 80:80
+      - 8080:8080
+
+  traefik:
+    image: "traefik:v2.9.1"
+    container_name: "traefik"
+    command:
+      # - "--log.level=DEBUG"
+      - "--accesslog"
+      - "--accesslog.filepath=/var/log/traefik/access.log"
+      - "--api.insecure=true"
+      - "--providers.docker=true"
+      - "--providers.docker.exposedbydefault=false"
+      - "--entrypoints.web.address=:80"
+      - "--entrypoints.web.forwardedheaders.trustedips=172.21.0.5"
+
+      - "--experimental.plugins.bouncer.modulename=github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin"
+      - "--experimental.plugins.bouncer.version=v1.1.0"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - logs-dev:/var/log/traefik
+    ports:
+      - 90:80
+      - 9080:8080
+    depends_on:
+      - crowdsec
+
+  whoami1:
+    image: traefik/whoami
+    container_name: "simple-service1"
+    labels:
+      - "traefik.enable=true"
+      # Definition of the router
+      - "traefik.http.routers.router1.rule=Path(`/foo`)"
+      - "traefik.http.routers.router1.entrypoints=web"
+      - "traefik.http.routers.router1.middlewares=crowdsec1@docker" 
+      # Definition of the service
+      - "traefik.http.services.service1.loadbalancer.server.port=80"
+      # Definitin of the middleware
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.enabled=true"
+      # crowdseclapikey must be uniq to the middleware attached to the service
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.crowdseclapikey=40796d93c2958f9e58345514e67740e5"
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.crowdsecmode=live"
+      - "traefik.http.middlewares.crowdsec1.plugin.bouncer.forwardedheaderstrustedips=172.21.0.5"
+  
+
+  crowdsec:
+    image: crowdsecurity/crowdsec:v1.4.1
+    container_name: "crowdsec"
+    environment:
+      COLLECTIONS: crowdsecurity/traefik
+      CUSTOM_HOSTNAME: crowdsec
+      BOUNCER_KEY_TRAEFIK_DEV_1: 40796d93c2958f9e58345514e67740e5
+      BOUNCER_KEY_TRAEFIK_DEV_2: 44c36dac5c4140af9f06f397508e82c7
+    volumes:
+      - ./acquis.yaml:/etc/crowdsec/acquis.yaml:ro
+      - logs-dev:/var/log/traefik:ro
+      - crowdsec-db-dev:/var/lib/crowdsec/data/
+      - crowdsec-config-dev:/etc/crowdsec/
+    labels:
+      - "traefik.enable=false"
+
+volumes:
+  logs-dev:
+  logs-cloudflare:
+  crowdsec-db-dev:
+  crowdsec-config-dev:

pkg/cache/cache.go

@@ -0,0 +1,39 @@
+package cache
+
+import (
+	"fmt"
+
+	ttl_map "github.com/leprosus/golang-ttl-map"
+
+	logger "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/pkg/logger"
+)
+const (
+	cacheBannedValue        = "t"
+	cacheNoBannedValue      = "f"
+)
+
+var cache = ttl_map.New()
+
+// Get Decision check in the cache if the IP has the banned / not banned value.
+// Otherwise return with an error to add the IP in cache if we are on.
+func GetDecision(clientIP string) (bool, error) {
+	banned, isCached := cache.Get(clientIP)
+	bannedString, isValid := banned.(string)
+	if isCached && isValid && len(bannedString) > 0 {
+		return bannedString == cacheBannedValue, nil
+	}
+	return false, fmt.Errorf("no cache data")
+}
+
+func SetDecision(clientIP string, isBanned bool, duration int64) {
+	if isBanned {
+		logger.Debug(fmt.Sprintf("%v banned", clientIP))
+		cache.Set(clientIP, cacheBannedValue, duration)
+	} else {
+		cache.Set(clientIP, cacheNoBannedValue, duration)
+	}
+}
+
+func DeleteDecision(clientIP string) {
+	cache.Del(clientIP)
+}

pkg/ip/ip.go

@@ -0,0 +1,127 @@
+package ip
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+)
+
+// CHECKER
+
+// Checker allows to check that addresses are in a trusted IPs.
+type Checker struct {
+	authorizedIPs    []*net.IP
+	authorizedIPsNet []*net.IPNet
+}
+
+// NewChecker builds a new Checker given a list of CIDR-Strings to trusted IPs.
+func NewChecker(trustedIPs []string) (*Checker, error) {
+	if len(trustedIPs) == 0 {
+		return nil, errors.New("no trusted IPs provided")
+	}
+
+	checker := &Checker{}
+
+	for _, ipMask := range trustedIPs {
+		if ipAddr := net.ParseIP(ipMask); ipAddr != nil {
+			checker.authorizedIPs = append(checker.authorizedIPs, &ipAddr)
+			continue
+		}
+
+		_, ipAddr, err := net.ParseCIDR(ipMask)
+		if err != nil {
+			return nil, fmt.Errorf("parsing CIDR trusted IPs %s: %w", ipAddr, err)
+		}
+		checker.authorizedIPsNet = append(checker.authorizedIPsNet, ipAddr)
+	}
+
+	return checker, nil
+}
+
+// Contains checks if provided address is in the trusted IPs.
+func (ip *Checker) Contains(addr string) (bool, error) {
+	if len(addr) == 0 {
+		return false, errors.New("empty IP address")
+	}
+
+	ipAddr, err := parseIP(addr)
+	if err != nil {
+		return false, fmt.Errorf("unable to parse address: %s: %w", addr, err)
+	}
+
+	return ip.ContainsIP(ipAddr), nil
+}
+
+// ContainsIP checks if provided address is in the trusted IPs.
+func (ip *Checker) ContainsIP(addr net.IP) bool {
+	for _, authorizedIP := range ip.authorizedIPs {
+		if authorizedIP.Equal(addr) {
+			return true
+		}
+	}
+
+	for _, authorizedNet := range ip.authorizedIPsNet {
+		if authorizedNet.Contains(addr) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func parseIP(addr string) (net.IP, error) {
+	userIP := net.ParseIP(addr)
+	if userIP == nil {
+		return nil, fmt.Errorf("can't parse IP from address %s", addr)
+	}
+
+	return userIP, nil
+}
+
+// STRATEGY
+
+// PoolStrategy is a strategy based on an IP Checker.
+// It allows to check whether addresses are in a given pool of IPs.
+type PoolStrategy struct {
+	Checker *Checker
+}
+
+// GetIP checks the list of Forwarded IPs (most recent first) against the
+// Checker pool of IPs. It returns the first IP that is not in the pool, or the
+// empty string otherwise.
+func (s *PoolStrategy) getIP(req *http.Request, customHeader string) string {
+	if s.Checker == nil {
+		return ""
+	}
+
+	xff := req.Header.Get(customHeader)
+
+	xffs := strings.Split(xff, ",")
+
+	for i := len(xffs) - 1; i >= 0; i-- {
+		xffTrimmed := strings.TrimSpace(xffs[i])
+		if len(xffTrimmed) == 0 {
+			continue
+		}
+		if contain, _ := s.Checker.Contains(xffTrimmed); !contain {
+			return xffTrimmed
+		}
+	}
+
+	return ""
+}
+
+// GetRemoteIP It returns the first IP that is not in the pool, or the empty string otherwise.
+func GetRemoteIP(req *http.Request, strategy *PoolStrategy, customHeader string) (string, error) {
+	remoteIP := strategy.getIP(req, customHeader)
+	if len(remoteIP) != 0 {
+		return remoteIP, nil
+	}
+	remoteIP, _, err := net.SplitHostPort(req.RemoteAddr)
+	if err != nil {
+		return "", fmt.Errorf("failed to extract ip from remote address: %w", err)
+	}
+	return remoteIP, nil
+}

pkg/logger/logger.go

@@ -0,0 +1,35 @@
+package logger
+
+import (
+	"io"
+	"log"
+	"os"
+)
+
+var (
+	loggerInfo  = log.New(io.Discard, "INFO: CrowdsecBouncerTraefikPlugin: ", log.Ldate|log.Ltime)
+	loggerDebug = log.New(io.Discard, "DEBUG: CrowdsecBouncerTraefikPlugin: ", log.Ldate|log.Ltime)
+)
+
+// Init Set Default log level to info in case log level to defined
+func Init(logLevel string) {
+	switch logLevel {
+		case "INFO":
+			loggerInfo.SetOutput(os.Stdout)
+		case "DEBUG":
+			loggerInfo.SetOutput(os.Stdout)
+			loggerDebug.SetOutput(os.Stdout)
+		default:
+			loggerInfo.SetOutput(os.Stdout)
+	}
+}
+
+// Info Log info
+func Info(str string) {
+	loggerInfo.Printf(str)
+}
+
+// Info Log debug
+func Debug(str string) {
+	loggerDebug.Printf(str)
+}