Authenticate multiple symfony2 firewalls with one login form

Perhaps you could try the 'context' firewall property.

Say you have a configuration something like this (which presumably you do):

security:    // providers etc ...    firewall:        main:            pattern: # ...            provider: my_users            http_basic: ~        api:            pattern: # ...            provider: my_users            http_basic: ~

In this case the user's session will contain a '_security_main' property after authenticating against the 'main' firewall, and then when they attempt to access an 'api' location they will be prompted to re-auth and will then gain a '_security_api' session property.

To prevent this re-prompt, you can add the 'context' property to each firewall definition you wish to share the same authentication - so:

security:    # providers etc ...    firewall:        main:            pattern: # ...            provider: my_users            http_basic: ~            context: primary_auth  # new        api:            pattern: # ...            provider: my_users            http_basic: ~            context: primary_auth  # new

In this case, upon authentication with the 'main' firewall, a '_security_primary_auth' property will be set in the user's session. Any subsequent requests inside the 'api' firewill will then use the value of '_security_primary_auth' to establish authentication status (and so the user will appear authenticated).

Of course this authentication context sharing will work both ways around (whether they auth first with the 'main' or the 'api' firewall) - if you only wanted transience in one direction, things would be more complex.

Hope this helps.