app.user is not accessible from unsecured area - security

Question

How is it possible to get app.user from unsecure area?
So I have secured area which starts from ^/user.
But I need to display logout form on area which is accessible for everyone and not secured. How is this possible? My security.yml:
security:
encoders:
Symfony\Component\Security\Core\User\User: plaintext
###:
algorithm: sha512
encode-as-base64: true
iterations: 10
###:
algorithm: sha512
encode-as-base64: true
iterations: 10
role_hierarchy:
providers:
admin:
name: admin
entity: { class: ###, property: login }
user:
name: user
entity: { class: ###, property: login }
firewalls:
admin:
pattern: ^/admin
form_login:
login_path: ###_login
check_path: ###_login_process
default_target_path: /admin/dashboard
anonymous: ~
logout:
path: /admin/logout
target: /admin/login
provider: admin
remember_me:
key: "###"
lifetime: 604800
path: /
domain: ~
user:
pattern: ^/user
form_login:
login_path: ###_login
check_path: ###_login_process
default_target_path: ###
anonymous: ~
logout:
path: /user/logout
target: /user/login
provider: user
remember_me:
key: "###"
lifetime: 604800
path: /
domain: ~
access_control:
- { path: ^/admin/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
- { path: ^/admin/, roles: ROLE_ADMIN }
- { path: ^/user/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
- { path: ^/user/, roles: ROLE_USER }

Answer 1

Well I changed a little bit my security.yml. So currently everything works ok.
user:
pattern: ^/
access_control:
- { path: ^/, roles: IS_AUTHENTICATED_ANONYMOUSLY }
...
UPDATE 1
It seems that line in access_controll is not required. Moreover by some reason(might be cache) anonymoous users were accessing /user areas

Answer 2

You can get app.user in some unsecured area because Symfony security relies on 2 different mechanisms: authentication and authorization.
Authentication is defined by firewalls. As soon as you get under a firewall, you get a token and eventually a app.user, even if it is anonymous.
Authorization is related to access_control rules. It is a second step, you can't put access control rules outside of a firewall. There you will deal with the ROLE requirement, in example if ROLE_ANONYMOUS is enoug, if you want ROLE_USER...
One more thing: to complexify a little further, a firewall can allow or disallow anonymous users. By default it is true, as it is required to have you login and login_check paths under yoru firewall though you cant' require there users to have a role other than ROLE_ANONYMOUS (if you do so, you will have an infinite loop).