* initial commit of the stripped restful-authentication

* http basic auth and login from cookie have been removed
* no it does not work yet, it's so f*cking secure, it won't even let legitimate users login

3 files changed, 236 insertions, 0 deletions

diff --git a/lib/authenticated_system.rb b/lib/authenticated_system.rb
new file mode 100644
index 0000000..7b813f4
--- /dev/null
+++ b/lib/authenticated_system.rb
@@ -0,0 +1,127 @@
+module AuthenticatedSystem
+  protected
+    # Returns true or false if the user is logged in.
+    # Preloads @current_user with the user model if they're logged in.
+    def logged_in?
+      !!current_user
+    end
+
+    # Accesses the current user from the session.
+    # Future calls avoid the database because nil is not equal to false.
+    def current_user
+      @current_user ||= login_from_session unless @current_user == false
+    end
+
+    # Store the given user id in the session.
+    def current_user=(new_user)
+      session[:user_id] = new_user ? new_user.id : nil
+      @current_user = new_user || false
+    end
+
+    # Check if the user is authorized
+    #
+    # Override this method in your controllers if you want to restrict access
+    # to only a few actions or if you want to check if the user
+    # has the correct rights.
+    #
+    # Example:
+    #
+    #  # only allow nonbobs
+    #  def authorized?
+    #    current_user.login != "bob"
+    #  end
+    #
+    def authorized?(action = action_name, resource = nil)
+      logged_in?
+    end
+
+    # Filter method to enforce a login requirement.
+    #
+    # To require logins for all actions, use this in your controllers:
+    #
+    #   before_filter :login_required
+    #
+    # To require logins for specific actions, use this in your controllers:
+    #
+    #   before_filter :login_required, :only => [ :edit, :update ]
+    #
+    # To skip this in a subclassed controller:
+    #
+    #   skip_before_filter :login_required
+    #
+    def login_required
+      authorized? || access_denied
+    end
+
+    # Redirect as appropriate when an access request fails.
+    #
+    # The default action is to redirect to the login screen.
+    #
+    # Override this method in your controllers if you want to have special
+    # behavior in case the user is not authorized
+    # to access the requested action.  For example, a popup window might
+    # simply close itself.
+    def access_denied
+      respond_to do |format|
+        format.html do
+          store_location
+          redirect_to new_session_path
+        end
+      end
+    end
+
+    # Store the URI of the current request in the session.
+    #
+    # We can return to this location by calling #redirect_back_or_default.
+    def store_location
+      session[:return_to] = request.request_uri
+    end
+
+    # Redirect to the URI stored by the most recent store_location call or
+    # to the passed default.  Set an appropriately modified
+    #   after_filter :store_location, :only => [:index, :new, :show, :edit]
+    # for any controller you want to be bounce-backable.
+    def redirect_back_or_default(default)
+      redirect_to(session[:return_to] || default)
+      session[:return_to] = nil
+    end
+
+    # Inclusion hook to make #current_user and #logged_in?
+    # available as ActionView helper methods.
+    def self.included(base)
+      base.send :helper_method, :current_user, :logged_in?, :authorized? if base.respond_to? :helper_method
+    end
+
+    #
+    # Login
+    #
+
+    # Called from #current_user.  First attempt to login by the user id stored in the session.
+    def login_from_session
+      self.current_user = User.find_by_id(session[:user_id]) if session[:user_id]
+    end
+    
+    #
+    # Logout
+    #
+
+    # This is ususally what you want; resetting the session willy-nilly wreaks
+    # havoc with forgery protection, and is only strictly necessary on login.
+    # However, **all session state variables should be unset here**.
+    def logout_keeping_session!
+      # Kill server-side auth cookie
+      @current_user.forget_me if @current_user.is_a? User
+      @current_user = false     # not logged in, and don't do it for me
+      kill_remember_cookie!     # Kill client-side auth cookie
+      session[:user_id] = nil   # keeps the session but kill our variable
+      # explicitly kill any other session variables you set
+    end
+
+    # The session should only be reset at the tail end of a form POST --
+    # otherwise the request forgery protection fails. It's only really necessary
+    # when you cross quarantine (logged-out to logged-in).
+    def logout_killing_session!
+      logout_keeping_session!
+      reset_session
+    end
+end
diff --git a/lib/authenticated_test_helper.rb b/lib/authenticated_test_helper.rb
new file mode 100644
index 0000000..c0ec5f4
--- /dev/null
+++ b/lib/authenticated_test_helper.rb
@@ -0,0 +1,6 @@
+module AuthenticatedTestHelper
+  # Sets the current user in the session from the user fixtures.
+  def login_as(user)
+    @request.session[:user_id] = user ? users(user).id : nil
+  end  
+end
diff --git a/lib/authentication.rb b/lib/authentication.rb
new file mode 100644
index 0000000..a936589
--- /dev/null
+++ b/lib/authentication.rb
@@ -0,0 +1,103 @@
+module Authentication
+  mattr_accessor :login_regex, :bad_login_message, 
+    :name_regex, :bad_name_message,
+    :email_name_regex, :domain_head_regex, :domain_tld_regex, :email_regex, :bad_email_message
+
+  self.login_regex       = /\A\w[\w\.\-_@]+\z/                     # ASCII, strict
+  # self.login_regex       = /\A[[:alnum:]][[:alnum:]\.\-_@]+\z/     # Unicode, strict
+  # self.login_regex       = /\A[^[:cntrl:]\\<>\/&]*\z/              # Unicode, permissive
+
+  self.bad_login_message = "use only letters, numbers, and .-_@ please.".freeze
+
+  self.name_regex        = /\A[^[:cntrl:]\\<>\/&]*\z/              # Unicode, permissive
+  self.bad_name_message  = "avoid non-printing characters and \\&gt;&lt;&amp;/ please.".freeze
+
+  self.email_name_regex  = '[\w\.%\+\-]+'.freeze
+  self.domain_head_regex = '(?:[A-Z0-9\-]+\.)+'.freeze
+  self.domain_tld_regex  = '(?:[A-Z]{2}|com|org|net|edu|gov|mil|biz|info|mobi|name|aero|jobs|museum)'.freeze
+  self.email_regex       = /\A#{email_name_regex}@#{domain_head_regex}#{domain_tld_regex}\z/i
+  self.bad_email_message = "should look like an email address.".freeze
+
+  def self.included(recipient)
+    recipient.extend(ModelClassMethods)
+    recipient.class_eval do
+      include ModelInstanceMethods
+    end
+  end
+
+  module ModelClassMethods
+    def secure_digest(*args)
+      Digest::SHA1.hexdigest(args.flatten.join('--'))
+    end
+
+    def make_token
+      secure_digest(Time.now, (1..10).map{ rand.to_s })
+    end
+  end # class methods
+
+  module ModelInstanceMethods
+  end # instance methods
+  
+  module ByPassword
+    # Stuff directives into including module
+    def self.included(recipient)
+      recipient.extend(ModelClassMethods)
+      recipient.class_eval do
+        include ModelInstanceMethods
+        
+        # Virtual attribute for the unencrypted password
+        attr_accessor :password
+        validates_presence_of     :password,                   :if => :password_required?
+        validates_presence_of     :password_confirmation,      :if => :password_required?
+        validates_confirmation_of :password,                   :if => :password_required?
+        validates_length_of       :password, :within => 6..40, :if => :password_required?
+        before_save :encrypt_password
+      end
+    end # #included directives
+
+    #
+    # Class Methods
+    #
+    module ModelClassMethods
+      # This provides a modest increased defense against a dictionary attack if
+      # your db were ever compromised, but will invalidate existing passwords.
+      # See the README and the file config/initializers/site_keys.rb
+      #
+      # It may not be obvious, but if you set REST_AUTH_SITE_KEY to nil and
+      # REST_AUTH_DIGEST_STRETCHES to 1 you'll have backwards compatibility with
+      # older versions of restful-authentication.
+      def password_digest(password, salt)
+        digest = REST_AUTH_SITE_KEY
+        REST_AUTH_DIGEST_STRETCHES.times do
+          digest = secure_digest(digest, salt, password, REST_AUTH_SITE_KEY)
+        end
+        digest
+      end      
+    end # class methods
+
+    #
+    # Instance Methods
+    #
+    module ModelInstanceMethods
+      
+      # Encrypts the password with the user salt
+      def encrypt(password)
+        self.class.password_digest(password, salt)
+      end
+      
+      def authenticated?(password)
+        crypted_password == encrypt(password)
+      end
+      
+      # before filter 
+      def encrypt_password
+        return if password.blank?
+        self.salt = self.class.make_token if new_record?
+        self.crypted_password = encrypt(password)
+      end
+      def password_required?
+        crypted_password.blank? || !password.blank?
+      end
+    end # instance methods
+  end
+end
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