This document contains information about a future release and not the current stable version (4). Be aware that information on this page may change and API's may not be stable for production use.
Whenever you are accepting or asking users to input data to your application there comes an added responsibility that it should be done as safely as possible. Below outlines the things to consider when building your forms.
Cross-Site Request Forgery (CSRF)
SilverStripe protect users against [Cross-Site Request Forgery](https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)
CSRF) by adding a SecurityID HiddenField to each Form instance. The
SecurityID contains a
random string generated by SecurityToken to identify the particular user request vs a third-party forging fake
For more information on Cross-Site Request Forgery, consult the [OWASP](https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF) website.
SecurityToken automatically added looks something like:
$form = new Form(..); echo $form->getSecurityToken()->getValue(); // 'c443076989a7f24cf6b35fe1360be8683a753e2c'
This token value is passed through the rendered Form HTML as a HiddenField.
<input type="hidden" name="SecurityID" value="c443076989a7f24cf6b35fe1360be8683a753e2c" class="hidden" />
The token should be present whenever a operation has a side effect such as a
It can be safely disabled for
GET requests as long as it does not modify the database (i.e a search form does not
normally require a security token).
$form = new Form(..); $form->disableSecurityToken();
Do not disable the SecurityID for forms that perform some modification to the users session. This will open your
application up to
CSRF security holes.
Strict Form Submission
To reduce attack exposure forms are limited, by default, to the intended HTTP verb (mostly
this check, forms that rely on
GET can be submitted via
PUT or vice-versa potentially leading to
application errors or edge cases. If you need to disable this setting follow the below example:
$form = new Form(..); $form->setFormMethod('POST'); $form->setStrictFormMethodCheck(false); // or alternative short notation.. $form->setFormMethod('POST', false);
Spam and Bot Attacks
SilverStripe has no built-in protection for detailing with bots, captcha or other spam protection methods. This
functionality is available as an additional Spam Protection
module if required. The module provides an consistent API for allowing third-party spam protection handlers such as
Recaptcha and Mollom to work within the