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module Warden
module Strategies
class SecureRemotePassword < Warden::Strategies::Base
def valid?
handshake? || authentication?
end
def authenticate!
if authentication?
validate!
else # handshake
initialize!
end
end
protected
def handshake?
params['A'] && params['login']
end
def authentication?
params['client_auth'] && session[:handshake]
end
def validate!
if client = validate
success!(User.find_by_login(client.username))
else
Rails.logger.warn "Login attempt failed."
Rails.logger.debug debug_info
Rails.logger.debug "Received: #{params['client_auth']}"
session.delete(:handshake)
fail!(:base => "invalid_user_pass")
end
end
def validate
session[:handshake].authenticate(params['client_auth'])
end
def initialize!
if user = User.find_by_login(id)
client = SRP::Client.new user.username,
:verifier => user.verifier,
:salt => user.salt
session[:handshake] = SRP::Session.new(client, params['A'])
custom! json_response(session[:handshake])
else
fail! :base => 'invalid_user_pass'
end
rescue SRP::InvalidEphemeral
fail!(:base => "invalid_ephemeral")
end
def json_response(object)
[ 200,
{"Content-Type" => "application/json; charset=utf-8"},
[object.to_json]
]
end
def id
params["id"] || params["login"]
end
protected
def debug_info
JSON.pretty_generate(session[:handshake].internal_state)
end
end
end
Warden::Strategies.add :secure_remote_password,
Warden::Strategies::SecureRemotePassword
end
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