The Fedora Account System has a JSON interface that we make use of to authenticate users in our web apps. Currently, there are two modes of operation. Some web apps have single sign-on capability with Fedora Account System. These are the TurboGears applications that use the jsonfasprovider. Other apps do not have single sign-on but they do connect to Fedora Account System to verify the username and password so changing the password in Fedora Account System changes it everywhere.
These methods are deprecated because they do not provide the CSRF protection of TurboGears Identity Provider 2. Please use that identity provider instead.