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Add documentation on cookie_samesite setting in FrameworkBundle #10202

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Add documentation on cookie_samesite setting in FrameworkBundle #10202

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14 changes: 14 additions & 0 deletions components/http_foundation/session_configuration.rst
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Expand Up @@ -153,6 +153,20 @@ be securely controlled from the server side.
with an expiry time of ``time()`` + ``cookie_lifetime`` where the time is taken
from the server.

Session Cookie SameSite
~~~~~~~~~~~~~~~~~~~~~~~

.. versionadded:: 4.2
  The option to use SameSite cookies for session was introduced in 4.2.
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for sessions?


SameSite cookies are a measure to protect against Cross Site Forgery Request (CSRF) attacks by preventing the cookies to be sent to the server if a request was not originated from the domain the cookies are for.
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Text should be at around 80 chars


There are two modes, ``lax`` and ``strict``. When set to ``strict`` cookies will never be sent along with the request, whereas with ``lax`` the cookies will be sent with HTTP GET requests, but not with HTTP POST requests.

This option can be set with the ``cookie_samesite`` setting.

This option will be available for sessions in PHP as of version 7.3, but Symfony has a polyfill for older versions of PHP, so it can also be used in PHP version lower than 7.3 as well.

Configuring Garbage Collection
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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