Token Mismatch When Upload Large File Laravel
CSRF Protection
- Introduction
- Preventing CSRF Requests
- Excluding URIs
- 10-CSRF-Token
- Ten-XSRF-Token
Introduction
Cantankerous-site asking forgeries are a type of malicious exploit whereby unauthorized commands are performed on behalf of an authenticated user. Thankfully, Laravel makes it like shooting fish in a barrel to protect your application from cantankerous-site request forgery (CSRF) attacks.
An Explanation Of The Vulnerability
In case y'all're not familiar with cross-site asking forgeries, permit'due south talk over an instance of how this vulnerability tin be exploited. Imagine your application has a /user/email route that accepts a POST request to change the authenticated user'southward email address. Most likely, this route expects an email input field to comprise the email address the user would like to brainstorm using.
Without CSRF protection, a malicious website could create an HTML form that points to your application's /user/email route and submits the malicious user's own electronic mail address:
< class activeness = " https://your-application.com/user/email " method = " Postal service " >
< input type = " email " value = " [email protected] " >
</ form >
< script >
document . forms [ 0 ] . submit ();
</ script >
If the malicious website automatically submits the grade when the folio is loaded, the malicious user only needs to lure an unsuspecting user of your application to visit their website and their email address volition be changed in your awarding.
To prevent this vulnerability, we need to inspect every incoming Mail, PUT, PATCH, or DELETE request for a hole-and-corner session value that the malicious application is unable to admission.
Preventing CSRF Requests
Laravel automatically generates a CSRF "token" for each active user session managed by the application. This token is used to verify that the authenticated user is the person actually making the requests to the application. Since this token is stored in the user'south session and changes each fourth dimension the session is regenerated, a malicious application is unable to admission it.
The electric current session'south CSRF token tin can be accessed via the request's session or via the csrf_token helper role:
apply Illuminate\Http\ Request ;
Route :: become ( ' /token ' , office ( Request $request ) {
$token = $request -> session () -> token ();
$token = csrf_token ();
// ...
});
Someday yous define a "POST", "PUT", "PATCH", or "DELETE" HTML form in your application, you should include a hidden CSRF _token field in the form so that the CSRF protection middleware tin can validate the request. For convenience, you may use the @csrf Blade directive to generate the hidden token input field:
< form method = " Postal service " activeness = " /profile " >
@csrf
<!-- Equivalent to... -->
< input type = " hidden " proper name = " _token " value = " {{ csrf_token () }} " />
</ grade >
The App\Http\Middleware\VerifyCsrfToken middleware, which is included in the spider web middleware group by default, will automatically verify that the token in the request input matches the token stored in the session. When these 2 tokens lucifer, we know that the authenticated user is the ane initiating the asking.
CSRF Tokens & SPAs
If y'all are building an SPA that is utilizing Laravel equally an API backend, yous should consult the Laravel Sanctum documentation for information on authenticating with your API and protecting against CSRF vulnerabilities.
Excluding URIs From CSRF Protection
Sometimes you may wish to exclude a set of URIs from CSRF protection. For example, if you are using Stripe to process payments and are utilizing their webhook arrangement, yous will need to exclude your Stripe webhook handler road from CSRF protection since Stripe will not know what CSRF token to send to your routes.
Typically, you should place these kinds of routes outside of the web middleware group that the App\Providers\RouteServiceProvider applies to all routes in the routes/web.php file. However, you may also exclude the routes by adding their URIs to the $except property of the VerifyCsrfToken middleware:
<?php
namespace App\Http\Middleware;
use Illuminate\Foundation\Http\Middleware\ VerifyCsrfToken as Middleware;
class VerifyCsrfToken extends Middleware
{
/**
* The URIs that should be excluded from CSRF verification.
*
* @var array
*/
protected $except = [
' stripe/* ' ,
' http://example.com/foo/bar ' ,
' http://example.com/foo/* ' ,
];
}
{tip} For convenience, the CSRF middleware is automatically disabled for all routes when running tests.
X-CSRF-TOKEN
In addition to checking for the CSRF token as a Mail parameter, the App\Http\Middleware\VerifyCsrfToken middleware will as well check for the Ten-CSRF-TOKEN asking header. Y'all could, for example, store the token in an HTML meta tag:
< meta proper noun = " csrf-token " content = " {{ csrf_token () }} " >
Then, yous tin instruct a library like jQuery to automatically add the token to all request headers. This provides simple, convenient CSRF protection for your AJAX based applications using legacy JavaScript technology:
$ . ajaxSetup ({
headers: {
' X-CSRF-TOKEN ' : $ ( ' meta[name="csrf-token"] ' ) . attr ( ' content ' )
}
});
10-XSRF-TOKEN
Laravel stores the current CSRF token in an encrypted XSRF-TOKEN cookie that is included with each response generated by the framework. You can use the cookie value to set the Ten-XSRF-TOKEN request header.
This cookie is primarily sent as a developer convenience since some JavaScript frameworks and libraries, like Angular and Axios, automatically place its value in the X-XSRF-TOKEN header on same-origin requests.
{tip} By default, the
resources/js/bootstrap.jsfile includes the Axios HTTP library which volition automatically send theX-XSRF-TOKENheader for you.
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Source: https://laravel.com/docs/9.x/csrf
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