Solve the problem of 400 error after enabling CSRF

How to solve the 400 error after enabling CSRF? This article mainly introduces the relevant information about the 400 error that occurs when POSTing data after enabling Csrf. I hope to be helpful.

I've been having this kind of error recently, and I've been looking for the cause. I accidentally saw an article that solved it, and I'd like to share it with everyone.

The first solution is to turn off Csrf

public function init(){
  $this->enableCsrfValidation = false;
}

The second solution is to add a hidden field to the form

The third solution is to add the _csrf field in AJAX

var csrfToken = $('meta[name="csrf-token"]').attr("content");
$.ajax({
 type: 'POST',
 url: url,
 data: {_csrf:csrfToken},
 success: success,
 dataType: dataType
});

The matching process of Yii and Yii::$app-> ;request->csrfToken Description of the storage location of this value:

Storage location

  protected function createCsrfCookie($token)
  {
    $options = $this->csrfCookie;
    $options['name'] = $this->csrfParam;
    $options['value'] = $token;
    return new Cookie($options);
  }

Verification method

  public function validateCsrfToken($token = null)
  {
    $method = $this->getMethod();
    // only validate CSRF token on non-"safe" methods http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.1
    if (!$this->enableCsrfValidation || in_array($method, ['GET', 'HEAD', 'OPTIONS'], true)) {
      return true;
    }

    $trueToken = $this->loadCsrfToken();

    if ($token !== null) {
      return $this->validateCsrfTokenInternal($token, $trueToken);
    } else {
      return $this->validateCsrfTokenInternal($this->getBodyParam($this->csrfParam), $trueToken)
        || $this->validateCsrfTokenInternal($this->getCsrfTokenFromHeader(), $trueToken);
    }
  }

Related recommendations:

Explanation of knowledge points about the same-origin policy and csrf security policy

Detailed introduction to XSS and CSRF

Yii2.0 defense against csrf attack method

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