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Clarified Password Encoders example #3858

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28 changes: 21 additions & 7 deletions components/security/authentication.rst
Original file line number Diff line number Diff line change
Expand Up @@ -237,21 +237,35 @@ method of the password encoder factory is called with the user object as
its first argument, it will return an encoder of type :class:`Symfony\\Component\\Security\\Core\\Encoder\\PasswordEncoderInterface`
which should be used to encode this user's password::

// fetch a user of type Acme\Entity\LegacyUser
$user = ...
// a Acme\Entity\LegacyUser instance
$user = ...;

// the password that was submitted, e.g. when registering
$plainPassword = ...;

$encoder = $encoderFactory->getEncoder($user);

// will return $weakEncoder (see above)
$encodedPassword = $encoder->encodePassword($plainPassword, $user->getSalt());

$user->setPassword($encodedPassword);

$encodedPassword = $encoder->encodePassword($password, $user->getSalt());
// ... save the user

// check if the password is valid:
Now, when you want to check if the submitted password (e.g. when trying to log
in) is correct, you can use::

// fetch the Acme\Entity\LegacyUser
$user = ...;

// the submitted password, e.g. from the login form
$plainPassword = ...;

$validPassword = $encoder->isPasswordValid(
$user->getPassword(),
$password,
$user->getSalt());
$user->getPassword(), // the encoded password
$plainPassword, // the submitted password
$user->getSalt()
);

.. _`CVE-2013-5750`: http://symfony.com/blog/cve-2013-5750-security-issue-in-fosuserbundle-login-form
.. _`BasePasswordEncoder::checkPasswordLength`: https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php