Laravel CSRF Token

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EDIT: I should have said this at the start, I'm using AngularJS in the FronEnd, and I'm making all the request via XHR. I'm developing an Application using CSRF Token for every user request.

Should I regenerate the Token after each request?

Something like

Session::forget("_token") and Session::put("_token", RANDOM_SOMETHING)

Or is it enough to use the same one each user Session?

Is there any benefit?

With Laravel 5 using Blades templates, it's pretty easy.

If you only want the value of the csrf token, you can generate it by writing:

{{ csrf_token() }}

which generates the token value like this:

7YC0Sxth7AYe4RFSjzaPf2ygLCecJhPbyXhz6vvF

If you are using forms, you can add the following line of code inside the form:

{{ csrf_field() }}

which will generate html like this:

<input type="hidden" name="_token" value="7YC0Sxth7AYe4RFSjzaPf2ygLCecJhblahblah">

CSRF in Laravel: how VerifyCsrfToken works and how to prevent , To protect your application, Laravel uses CSRF tokens. CSRF tokens are strings that are automatically generated and can be attached to a form  Laravel includes an in built CSRF plug-in, that generates tokens for each active user session. These tokens verify that the operations or requests are sent by the concerned authenticated user.

Laravel should be doing this for you, you don't need to manage the creation / deletion of _token

<input type="hidden" name="_token" value="<?php echo csrf_token(); ?>">

See the 'CSRF Protection' section in the docs here: http://laravel.com/docs/security

Laravel CSRF Token, With Laravel 5 using Blades templates, it's pretty easy. If you only want the value of the csrf token, you can generate it by writing: {{ csrf_token() }}. @itachi Laravel's CSRF token is used to prevent cross-site requests (typically XSS). It is a token saved to the website's session and sent with every form submission, so a form must be submitted from the website with the session to have the correct session..rather than faking a request with cross-site scripting.

If you are using Laravel 5.6, do the following at the top of forms to create hidden input field for the CSRF token

  @csrf

Laravel - CSRF Protection, js registers all the tokens for Laravel applications and includes meta tag which stores csrf-token with Axios HTTP library. Form without CSRF token. Consider the​  How can I use CSRF token with axios post method? Posted 2 years ago by hemal Im new to vue in laravel. earlier when I want to save some data throw an action below form I can use {{ csrf_field() }}

Depends. If the attacker is not MITM, in the sense that they cannot eavesdrop on traffic between your web app and the API server, a single CSRF token for the entire session should be enough.

Assuming you guard sensitive operations on the server-side too (i.e. allow access to resources only to the owner of the resource, e.g. "delete my account", etc.) the token would ensure that the browser making the request is the legitimate, authenticated user's browser. That's all you should worry about, I think.

On the other hand, if the attacker is capable of looking at non-secure traffic between the web app and your API, they may get hold of the CSRF token and your session_id and do evil stuff transparently. In such case granting, using and subsequently discarding a token for each request (POST, or any kind that does sensitive operation) only makes their job a bit more difficult, but you're still doomed.

My 2 cents...

Laravel, Laravel provides protection with the CSRF attacks by generating a CSRF token. This CSRF token is generated automatically for each user. This token is nothing  I recently migrated to Laravel 5, and now CSRF check is on every post submission. I thought about removing it but I want to follow the best practices, so I'll keep it that way. On the other hand,

CSRF token prevents Cross-Site attack by comparing cookie token with server token.

You can generate csrf token in laravel by csrf_token() helper function. If you want full csrf fields then you can use csrf_field() function and csrf internal logic is

function csrf_field()
{
   return new HtmlString('<input type="hidden" name="_token" value="'.csrf_token().'">');
}

When new request will generate then laravel create random token every time and store in browser cookie and session after stored Its compare to each other like cookie == session token

Laravel Internal logic is following and you can find it in VerifyCsrfToken Middleware.

/**
 * Determine if the session and input CSRF tokens match.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return bool
 */
protected function tokensMatch($request)
{
    $token = $this->getTokenFromRequest($request);

    return is_string($request->session()->token()) &&
           is_string($token) &&
           hash_equals($request->session()->token(), $token);
}

/**
 * Get the CSRF token from the request.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return string
 */
protected function getTokenFromRequest($request)
{
    $token = $request->input('_token') ?: $request->header('X-CSRF-TOKEN');

    if (! $token && $header = $request->header('X-XSRF-TOKEN')) {
        $token = $this->encrypter->decrypt($header);
    }

    return $token;
}

/**
 * Add the CSRF token to the response cookies.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \Symfony\Component\HttpFoundation\Response  $response
 * @return \Symfony\Component\HttpFoundation\Response
 */
protected function addCookieToResponse($request, $response)
{
    $config = config('session');

    $response->headers->setCookie(
        new Cookie(
            'XSRF-TOKEN', $request->session()->token(), $this->availableAt(60 * $config['lifetime']),
            $config['path'], $config['domain'], $config['secure'], false, false, $config['same_site'] ?? null
        )
    );

    return $response;
}

How to use Laravel CSRF to Protect Applications, Laravel CSRF Token Protection. Today, many PHP frameworks like Laravel and others have built-in support for  How to pass laravel CSRF token value to vue. Ask Question Asked 3 years, 6 months ago. Laravel 5 CSRF global token hidden field for all forms in a page. 3.

CSRF Protection in Laravel explained - Barry vd. Heuvel, We compare the difference between the CSRF filter in Laravel 4 and the current VerifyCsrfToken middleware in Laravel 5. Why do we need CSRF protection? APIs typically use tokens to authenticate users and do not maintain session state between requests. Laravel makes API authentication a breeze using Laravel Passport, which provides a full OAuth2 server implementation for your Laravel application in a matter of minutes.

Laravel Beginner tutorial, 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  To protect your application, Laravel uses CSRF tokens. CSRF tokens are strings that are automatically generated and can be attached to a form when the form is created. They are used to uniquely identify forms generated from the server. The idea behind it is that when the server receives POST requests, the server checks for a CSRF token.

What is csrf token in Laravel?, In Laravel, CSRF token generated automatically with the use of some predefined blade directives. All these tokens are managed by the  CSRF Protection. Laravel provides an easy method of protecting your application from cross-site request forgeries. Inserting CSRF Token Into Form <input type="hidden" name="_token" value="<?php echo csrf_token(); ?>"> Validate The Submitted CSRF Token

Comments
  • What are you using the token for? Assuming you are using it for something other than preventing XSS, its hard to say if it will be "good" enough for your scenario.
  • @itachi Laravel's CSRF token is used to prevent cross-site requests (typically XSS). It is a token saved to the website's session and sent with every form submission, so a form must be submitted from the website with the session to have the correct session..rather than faking a request with cross-site scripting.
  • @Sam yup. but CSRF and XSS are two very different aspect. having a token will help you in csrf but not in xss.
  • @itachi fair enough, thanks for pointing that out. My explanation was pretty subpar, but the point still stands (in my opinion) that we need to know the OP's intention for using the CSRF token to secure his application.
  • Im using AngularJS in the FronEnd, im sending the CSRF Token on each XHR Request, im not handling it the regular way
  • I have tried using Session::token() and other methods for retrieving the token, but Laravel doesn't renegerates the Token, My question was IF I SHOULD REGENERATE the Token or simply use the same one on the entire session
  • This answer should be accepted by the OP since it's the only one that actually tries to answer his question.
  • Good answer with example, Thanks