Fix Authelia OIDC login by implementing secure state and nonce #198
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Description
This PR fixes issue #143 where Authelia OIDC login fails due to a missing or weak
stateparameter.Changes include:
state(base64 encoded) inUserOidcAuth.new/2.noncefor additional security and passes it toOidcc.stateparameter inUserOidcAuth.callback/2against the session value to prevent CSRF attacks.UserOidcAuthTestto verify the presence of security parameters in the session and proper error handling./claim #143