Logging out with Rake:Auth:Basic

Hi all,

I’m writting a small app that requires basic authentication in Sinatra.
I followed the advice of the official Sinatra faq
(http://www.sinatrarb.com/faq.html#auth) and have implemented this code
with success:

require 'rubygems'
require 'sinatra'

helpers do

  def protected!
    response['WWW-Authenticate'] = %(Basic realm="Testing HTTP Auth")
and \
    throw(:halt, [401, "Not authorized\n"]) and \
    return unless authorized?
  end

  def authorized?
    @auth ||=  Rack::Auth::Basic::Request.new(request.env)
    @auth.provided? && @auth.basic? && @auth.credentials &&
@auth.credentials == ['admin', 'admin']
  end

end

get '/' do
  "Everybody can see this page"
end

get '/protected' do
  protected!
  "Welcome, authenticated client"
end

So I get a window asking me to ender my credentials when going to
/protected and it logs me in. Once logged in though, I would like to be
able to log out. I know the solution to this must be super easy but I
just can’t get it to work.

Any help is greatly appreciated. Thanks!

-Tony

Just realized I posted this to the rails forum instead of the ruby
forum. Sorry!

Ahh… there go my hopes for a simple and secure login/logout system!
Many thanks for the useful information before I started ripping my hair
out!

Any suggestions on another easy to implement login/logout system? I
don’t require user signups. I just want to hardcode maybe 2 or 3
usernames and passwords that I could enter from a ‘/login’ page. This is
only for my personal use.

Thanks again!

-Tony

Go with the simplest solution - have a ‘login’ action that checks
against the hard-coded info, then sets a cookie. Check for that in
your protected actions (something like the code in protected! you
posted), and clear the cookie on logout.

(No idea what cookie handling looks like on Sinatra, but it should be
easy)

–Matt J.

Thanks for the reply Matt!

I did something like this… I’d like to know what you and others think
of it as far as security goes. While it’s not a bank or anything, I’d
like my app to be as hacker proof as possible. Any suggestions to make
it more secure are welcome!

Many thanks guys!

LOGIN FORM (GET LOGIN METHOD)

Username

Password

Login

POST LOGIN METHOD

post ‘/login’ do

if authenticate(params[“post”][“username”],
Digest::MD5.hexdigest(params[“post”][“password”]))
session[:user] = params[“post”][“username”]
flash[:notice] = “Login succeeded!”
redirect ‘/admin’
else
flash[:error] = “Login failed!”
redirect ‘/login’
end

end

HELPER METHODS

Authentication is hard-coded as there will only 1-3 users

def authenticate(username, password)

if username == 'admin' and password == '[admin_password_in_MD5]'
  return true
else
  return false
end

end

Protect pages

def login_required
if session[:user]
return true
else
redirect ‘/login’
return false
end
end

Get the username of the logged in user

def current_user
if session[:user]
session[:user]
end
end

Verify if a user is logged in

def logged_in?
!!session[:user]
end

Anyway, I hope this helps others looking for a simple login method.

Best regards,
Tony

Basic authentication doesn’t support the concept of “logging out” -
see this Apache FAQ:

http://httpd.apache.org/docs/1.3/howto/auth.html#basicfaq

–Matt J.

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