c.ClientIP() #2697

artlevitan · 2021-04-20T14:16:00Z

Friends, the update to 1.7 broke the work with IP addresses of clients.

I am proxying Go through Nginx

location /backend/ {
        rewrite /backend/(.*) /$1 break;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_pass http:https://127.0.0.1:8080;
    }

I read this #2693

But I don't understand what to write in router.TrustedProxies

func GinRouter() *gin.Engine {
	router := gin.New()

	// Set a lower memory limit for multipart forms
	router.MaxMultipartMemory = 100 << 20 // 100 MB

	// Custom Logger
	router.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {
		return fmt.Sprintf("%s |%s %d %s| %s |%s %s %s %s | %s | Body: %s | %s | %s\n",
			param.TimeStamp.Format(time.RFC1123),
			param.StatusCodeColor(),
			param.StatusCode,
			param.ResetColor(),
			param.ClientIP,
			param.MethodColor(),
			param.Method,
			param.ResetColor(),
			param.Path,
			param.Latency,
			byteCountSI(param.BodySize),
			param.Request.UserAgent(),
			param.ErrorMessage,
		)
	}))

	// Recovery middleware recovers from any panics and writes a 500 if there was one.
	router.Use(gin.Recovery())

	return router
}

Thanks everyone 🙏🏻

The text was updated successfully, but these errors were encountered:

cyanBone · 2021-04-21T15:17:35Z

me too

1989bajie · 2021-04-26T05:08:19Z

框架升级是不是需要考虑平滑？这就意味着用过这个方法的用户，升完级都要出问题了。。。。

leungyauming · 2021-04-27T02:29:45Z

框架升级是不是需要考虑平滑？这就意味着用过这个方法的用户，升完级都要出问题了。。。。

Translate:
Shouldn't migration be considered in upgrades? That means users who have used the method will be in trouble after upgrading.

artlevitan · 2021-04-27T03:54:01Z

The best way is roll back the trusted proxy update and make it optional.

Almost everyone uses Nginx and add-on packages so that there is no doubt about the client.

leungyauming · 2021-04-29T05:37:02Z

// ClientIP implements a best effort algorithm to return the real client IP.
// It called c.RemoteIP() under the hood, to check if the remote IP is a trusted proxy or not.
// If it's it will then try to parse the headers defined in Engine.RemoteIPHeaders (defaulting to [X-Forwarded-For, X-Real-Ip]).
// If the headers are nots syntactically valid OR the remote IP does not correspong to a trusted proxy,
// the remote IP (coming form Request.RemoteAddr) is returned.

According to the documentation of the gin.Context.ClientIP() function, it will check if the remote IP (which is the ip of the proxy or the ip of nginx in your case) is a trusted IP or not.

If it is a trusted IP (which means the request is redirected by a proxy), then it will try to parse the "real user IP" from X-Forwarded-For/X-Real-Ip header.

Conclusion: You can think TrustedProxies as the identifiers for classifying whether the request is redirected from a proxy or not. If you don't type any IP into TrustedProxies, then you may get the IP of the proxy as the "user" IP.

For Chinese:
根據gin.Context.ClientIP()函數的文檔，該函數會先透過TrustedProxies變量來偵查HTTP請求的來源IP是否是所謂的“信任代理”。
如果該HTTP請求的來源IP屬於“信任代理”那麼伺服器就會嘗試從X-Forwarded-For或X-Real-Ip頭文取得真正用戶的IP。所以簡單來說就是，TrustedProxies是用來給伺服器判斷是否從頭文取得IP的。

artlevitan · 2021-04-29T08:46:58Z

Thanks for the answer, I saw the documentation and code comments.

Why is 127.0.0.1 not the default trusted address? Most people use Nginx for serve to WAN.

leungyauming · 2021-04-29T09:13:08Z

// New returns a new blank Engine instance without any middleware attached.
// By default the configuration is:
// - RedirectTrailingSlash:  true
// - RedirectFixedPath:      false
// - HandleMethodNotAllowed: false
// - ForwardedByClientIP:    true
// - UseRawPath:             false
// - UnescapePathValues:     true
func New() *Engine {
	debugPrintWARNINGNew()
	engine := &Engine{
		RouterGroup: RouterGroup{
			Handlers: nil,
			basePath: "/",
			root:     true,
		},
		FuncMap:                template.FuncMap{},
		RedirectTrailingSlash:  true,
		RedirectFixedPath:      false,
		HandleMethodNotAllowed: false,
		ForwardedByClientIP:    true,
		RemoteIPHeaders:        []string{"X-Forwarded-For", "X-Real-IP"},
		TrustedProxies:         []string{"0.0.0.0/0"},
		AppEngine:              defaultAppEngine,
		UseRawPath:             false,
		RemoveExtraSlash:       false,
		UnescapePathValues:     true,
		MaxMultipartMemory:     defaultMultipartMemory,
		trees:                  make(methodTrees, 0, 9),
		delims:                 render.Delims{Left: "{{", Right: "}}"},
		secureJSONPrefix:       "while(1);",
	}
	engine.RouterGroup.engine = engine
	engine.pool.New = func() interface{} {
		return engine.allocateContext()
	}
	return engine
}

As you can see, the default value of the TrustedProxies field is []string{"0.0.0.0/0"} which should has included 127.0.0.1 already.

And alternative IP in X-Forwarded-For/X-Real-IP should be returned if they actually present.

artlevitan · 2021-04-29T09:14:59Z

it does not work for me, as well as for many who opened topics with such a problem.

#2693

leungyauming · 2021-04-29T09:16:21Z

Interesting, let me go to take a look and test it.

artlevitan · 2021-04-29T09:18:17Z

log from SSH

main[25495]: Thu, 29 Apr 2021 12:16:51 | 200 | 127.0.0.1 | ....
main[25495]: Thu, 29 Apr 2021 12:16:53 | 200 | 127.0.0.1 | ....

In all responses localhost (127.0.0.1)

the proxy configuration was thrown above

location /backend/ {
        rewrite /backend/(.*) /$1 break;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_pass http:https://127.0.0.1:8080;
    }

leungyauming · 2021-04-29T09:37:18Z

client/main.go

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest(http.MethodGet, "http:https://127.0.0.1:8080", nil)
	req.Header.Add("X-Forwarded-For", "123.123.123.123")
	res, _ := http.DefaultClient.Do(req)
	body := res.Body
	data, _ := io.ReadAll(body)
	fmt.Println(string(data))
	defer body.Close()
}

server/main.go

package main

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.New()

	r.GET("/", func(c *gin.Context) {
		c.String(http.StatusOK, "%s", c.ClientIP())
	})

	r.Run()
}

I created a simple client and server.
Then sent a http request with X-Forwarded-For header set to 123.123.123.123 from the client to the server.
Print the result to the console.

Here is the output. As you can see, the result is correct and the feature is working.
May you please check if the header is set and sent to the server successfully? (I suggest printing the headers received in your handler function, the variable name is c.Request.Header which should be a string-string map)

artlevitan · 2021-04-29T10:18:05Z

Header X-Forwarded-For from Nginx in my case is correct too
But c.ClientIP() in GIN 1.7 always return me 127.0.0.1

If I use
req.Header.Get("X-Forwarded-For")
I get the correct address too, like your example

I can't understand how to work with Nginx & GIN 1.7+

artlevitan · 2021-04-29T10:24:49Z

Just in case, I post the source code to check

package main

import (
	"fmt"
	"net/http"
	"os"
	"time"

	"github.com/gin-gonic/gin"
)

// Response
type Response struct {
	Status  int    `json:"status"`
	Message string `json:"message,omitempty"`
}

// ResponseBody
type ResponseBody struct {
	Response   `json:"response"`
	Additional interface{} `json:"additional,omitempty"`
	Payload    interface{} `json:"payload,omitempty"`
}

// GinRouter - GIN-Router
func GinRouter() *gin.Engine {
	router := gin.New()

	// Set a lower memory limit for multipart forms
	router.MaxMultipartMemory = 100 << 20 // 100 MB

	// Custom Logger
	router.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {
		return fmt.Sprintf("%s |%s %d %s| %s |%s %s %s %s | %s | %s | %s\n",
			param.TimeStamp.Format(time.RFC1123),
			param.StatusCodeColor(),
			param.StatusCode,
			param.ResetColor(),
			param.ClientIP,
			param.MethodColor(),
			param.Method,
			param.ResetColor(),
			param.Path,
			param.Latency,
			param.Request.UserAgent(),
			param.ErrorMessage,
		)
	}))

	// Recovery middleware recovers from any panics and writes a 500 if there was one.
	router.Use(gin.Recovery())

	return router
}

func main() {

	// Server Settings
	router := GinRouter()
	server := &http.Server{
		Addr:           ":8080",
		Handler:        router,
		ReadTimeout:    30 * time.Second,
		WriteTimeout:   30 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}

	// Ping test
	router.GET("/ping", func(c *gin.Context) {
		var respBody ResponseBody
		c.JSON(respBody.Status, respBody)
	})

	//
	err := server.ListenAndServe()
	if err != nil {
		fmt.Println("Could not start application")
		fmt.Println(err.Error())
		os.Exit(1)
	}
}

leungyauming · 2021-04-29T11:05:15Z

Did you deploy your Nginx to the same machine as the server and the client?

Header X-Forwarded-For from Nginx in my case is correct too
But c.ClientIP() in GIN 1.7 always return me 127.0.0.1

If I use
req.Header.Get("X-Forwarded-For")
I get the correct address too, like your example

I can't understand how to work with Nginx & GIN 1.7+

I know you said that you can get the correct address through header.
But just want to make sure, because the $remote_addr variable will be 127.0.0.1 if you send a request to the Nginx proxy with the same machine.

artlevitan · 2021-04-29T12:52:04Z

GO and Nginx are on the same server, everything was ok before the update gin 1.7

leungyauming · 2021-04-29T13:03:09Z

Try to send a request to Nginx with another machine, because if you send the request using the same machine with Nginx, Nginx will set the $remote_addr variable of the proxy_set_header procedure to be 127.0.0.1 and then your Go application will receive 127.0.0.1 as the final IP of the "user".

artlevitan · 2021-04-29T13:05:12Z

Are you proposing to change the server infrastructure, which works fine due to the fact that the GIN version has been updated?

leungyauming · 2021-04-29T13:12:03Z

No, I didn't mean you need to change the server infrastructure. I just want to make sure that you are actually testing it in the right way.

You said your Go application and your Nginx proxy server is deployed in the same machine
You said getting the IP through the header is working but through the Nginx proxy is not working
I'm not sure if you are using the same machine to send HTTP request to your Nginx proxy (because if you send a request to Nginx with the same machine your IP will be 127.0.0.1)

As the result, I think it may be caused by the 3 point I just mentioned. So I call you to try to "send request" to your Nginx proxy with a different machine, I didn't mean moving the Golang application to another machine.

xpunch · 2021-04-30T08:16:01Z

I meet the same problem too, after debug the application, I found this issue occur when engine.Run() was not called.
My application use gin as web handler, so it didn't need to startup by engine.Run, which makes trustedCIDRs not got initialized.
So it will never read IP from headers, case trustedCIDRs is nil.

leungyauming · 2021-04-30T08:18:26Z

I meet the same problem too, after debug the application, I found this issue occur when engine.Run() was not called.
My application use gin as web handler, so it didn't need to startup by engine.Run, which makes trustedCIDRs not got initialized.
So it will never read IP from headers, case trustedCIDRs is nil.

Good catch! I didn't actually notice that too.

yiranzai · 2021-04-30T08:59:18Z

well, I pointed it out at the beginning. #2692

leungyauming · 2021-04-30T09:01:00Z

@artlevitan Please take a look and sorry for my misleading information.

evanfuller · 2021-05-05T17:49:17Z

I have also run into this problem. I see there is a PR to expose a workaround for setting trusted proxies, but I can't tell if it was abandoned.

wackwinds · 2021-05-06T08:26:56Z

when we start with RunTLS instand of Run, ClientIP() will always return 127.0.0.1 while prepareTrustedCIDRs() not called
it seems ClientIP just work fine under http, not https or others

wackwinds · 2021-05-06T08:38:17Z

看了下源码，prepareTrustedCIDRs只在run里有调用，RunTLS没调，也就是ClientIP只能在http环境使用，上面某评论说一直返回127.0.0.1其实也是因为走的https环境

SteadyWorkerS · 2021-05-28T08:00:38Z

nginx and gin v1.7 same machine, and send request to nginx from another machine, but method ClientIP return "127.0.0.1", which is not we want

SennoYuki · 2021-06-16T10:14:58Z

这个升级的破坏性真是神坑

petanne · 2021-07-29T08:39:28Z

Bad and very destructive upgrade！！！

montanaflynn · 2021-08-04T08:00:22Z

@axiaoxin I had same problem, I used router.TrustedProxies = []string{"0:0:0:0:0:0:0:0001"} and it worked though.

@leungyauming When will the fix for code that doesn't use router.Run be released? This is basically all production code that uses graceful termination and is behind trusted proxies like cloudfront.

montanaflynn · 2021-08-05T06:11:44Z

By the way I ended up just using this function since I wanted the old logic and my servers are behind cloudfront:

func getClientIP(c *gin.Context) string {
	forwardHeader := c.Request.Header.Get("x-forwarded-for")
	firstAddress := strings.Split(forwardHeader, ",")[0]
	if net.ParseIP(strings.TrimSpace(firstAddress)) != nil {
		return firstAddress
	}
	return c.ClientIP()
}

Then replaced c.ClientIP() with getClientIP(c) and I'm back in business. Really unfortunate that just upgrading version caused us to lose days of user's real IP addresses, this should have been an opt-in change in my opinion, especially since it was broken.

kainosnoema · 2021-08-10T02:35:17Z

Also having this issue. We don't call engine.Run() and instead just use the handler directly. When will this get addressed?

AlbinoGeek · 2021-08-10T11:10:29Z

Also waiting for this to be fixed...

Without that method exposed, I can't enable the feature, as I don't start the server using .Run()

dpanic · 2021-09-01T12:45:16Z

By the way I ended up just using this function since I wanted the old logic and my servers are behind cloudfront:
func getClientIP(c *gin.Context) string {
	forwardHeader := c.Request.Header.Get("x-forwarded-for")
	firstAddress := strings.Split(forwardHeader, ",")[0]
	if net.ParseIP(strings.TrimSpace(firstAddress)) != nil {
		return firstAddress
	}
	return c.ClientIP()
}
Then replaced c.ClientIP() with getClientIP(c) and I'm back in business. Really unfortunate that just upgrading version caused us to lose days of user's real IP addresses, this should have been an opt-in change in my opinion, especially since it was broken.

I used your code, but modified it to be as a middleware which I invoke before all.

I did it this way in order to avoid wrapping and changing everywhere ctx.ClientIP()

func Preprocess(logger *zap.Logger) gin.HandlerFunc {
	return func(ctx *gin.Context) {

		_, port, _ := net.SplitHostPort(strings.TrimSpace(ctx.Request.RemoteAddr))

		ip := getClientIP(ctx)
		ctx.Request.RemoteAddr = fmt.Sprintf("%s:%s", ip, port)

		ctx.Next()
	}
}

Of course this is only mitigation, we're all waiting for regular fix of this issue.

guillermo-menjivar · 2021-09-06T17:54:26Z

any updates on this issue?

adamwoolhether · 2021-10-05T01:33:56Z

just discovered issues wtih this today as well....

virskor · 2021-10-30T02:24:30Z

    proxy_set_header X-Real-IP   $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header HTTP_X_FORWARDED_FOR $remote_addr;#在多级代理的情况下，记录每次代理之前的客户端真实ip
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_redirect off;

    
    proxy_pass https://remote_app_proxy_url;

after add NGINX configurations use code below to get real client IP

also Gin egine

router := gin.New()
router.TrustedProxies := []string{"0.0.0.0/0"}
router.RemoteIPHeaders :=  []string{"X-Forwarded-For", "X-Real-IP"}

func GetRealIP(c *gin.Context) string {
	ip := c.GetHeader("X-Real-IP")
	if len(ip) == 0 {
		return c.ClientIP()
	}

	return ip
}

will this comment help you? i hope that

artlevitan · 2021-10-30T06:22:31Z

Hey! No, it didn't help me, I tried this method at the beginning.

artlevitan · 2021-11-02T09:08:05Z

I use this code until Gin is updated normally.

func clientIP(c *gin.Context) string {
	ip := c.GetHeader("X-Forwarded-For") // ip := c.ClientIP()

	// localhost
	if ip == "127.0.0.1" || ip == "::1" {
		return ""
	}
	// Drop Local / Reserved Address Ranges
	var (
		ip1_1 = net.ParseIP("10.0.0.0")
		ip1_2 = net.ParseIP("10.255.255.255")
		ip2_1 = net.ParseIP("127.0.0.0")
		ip2_2 = net.ParseIP("127.255.255.255")
		ip3_1 = net.ParseIP("169.254.0.0")
		ip3_2 = net.ParseIP("169.254.255.255")
		ip4_1 = net.ParseIP("172.16.0.0")
		ip4_2 = net.ParseIP("172.31.255.255")
		ip5_1 = net.ParseIP("192.168.0.0")
		ip5_2 = net.ParseIP("192.168.255.255")
	)
	trial := net.ParseIP(ip)
	if bytes.Compare(trial, ip1_1) >= 0 && bytes.Compare(trial, ip1_2) <= 0 {
		return ""
	}
	if bytes.Compare(trial, ip2_1) >= 0 && bytes.Compare(trial, ip2_2) <= 0 {
		return ""
	}
	if bytes.Compare(trial, ip3_1) >= 0 && bytes.Compare(trial, ip3_2) <= 0 {
		return ""
	}
	if bytes.Compare(trial, ip4_1) >= 0 && bytes.Compare(trial, ip4_2) <= 0 {
		return ""
	}
	if bytes.Compare(trial, ip5_1) >= 0 && bytes.Compare(trial, ip5_2) <= 0 {
		return ""
	}
	return ip
}

thinkerou · 2021-11-24T14:05:46Z

v1.7.7 have released, thanks! https://github.com/gin-gonic/gin/releases

bytejedi · 2021-12-03T04:45:36Z

Who cares about Trusted Proxies and Trusted shit... The bugs introduced by this feature are ridiculous. That's an env security stuff. This is the job of a load balancer or something like that in front of the gin server. Not suitable for enterprise users

jiyeyuran · 2021-12-17T11:20:01Z

Still not working if remote IP is ::1 .

jiyeyuran · 2021-12-17T11:37:42Z

	engine := gin.New()
	engine.SetTrustedProxies([]string{"0.0.0.0/0", "::/0"})

Gin update to 1.7 broke the work with IP addresses of clients: now 'X-Forwarded-For' and 'X-Real-Ip' headers needs to be set as trusted for 'c.ClientIP()' method to successfully read the client's IP in case 'gin.Run' method is not used. Related issue: gin-gonic/gin#2697

duaneking · 2022-09-30T21:01:22Z

I just bumped into this; this "feature" is full of defects, imho.

ECHibiki · 2022-10-13T09:51:42Z

just set trusted proxies []string to have ::1 and get nginx to pass down the real ip...

yiranzai mentioned this issue Apr 25, 2021

set engine.TrustedProxies For items that don't use gin.RUN #2692

Merged

maxyzli mentioned this issue May 4, 2021

build(deps): bump github.com/gin-gonic/gin from 1.6.3 to 1.7.1 MurmurationsNetwork/MurmurationsServices#135

Closed

wizjin mentioned this issue May 27, 2021

fix: output real client ip in log. chanify/chanify#66

Closed

wass3r mentioned this issue Jul 29, 2021

Server doesn't honor X-Forwarded-For go-vela/community#346

Open

montanaflynn mentioned this issue Aug 4, 2021

Remove the new trustedproxy logic from client ip parsing #2809

Open

applike-ss mentioned this issue Aug 4, 2021

deps: updated gin-gonic from 1.6.3 to 1.7.7; justtrackio/gosoline#539

Merged

AlbinoGeek mentioned this issue Aug 10, 2021

Export engine.prepareTrustedCIDRs() #2814

Open

zihengCat mentioned this issue Aug 13, 2021

Make TrustedProxies feature backward-compatible #2819

Closed

Bisstocuz mentioned this issue Aug 19, 2021

Quick Fix c.ClientIP() Parse Error for TrustedProxies feature & NoMethod annotation #2832

Merged

Bisstocuz mentioned this issue Sep 29, 2021

Tidy: Complete TrustedProxies feature #2887

Merged

menduo mentioned this issue Oct 20, 2021

Would you please make a release which fix #2697 c.ClientIP() bug in #2832 #2909

Closed

artlevitan closed this as completed Oct 30, 2021

artlevitan reopened this Oct 30, 2021

thinkerou closed this as completed Nov 24, 2021

x1ah mentioned this issue Feb 25, 2023

refactor: fix IP parse xiachufang/krakend-ipfilter#6

Merged

c.ClientIP() #2697

c.ClientIP() #2697

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