Rails 3 and OAuth for Barcamp Tampa

Rails 3 and OAuth BarCamp Tampa, September 26, 2010

Who am I? Hello, I’m Bryce. I snuck up here from Miami. I make web applications with Ruby on Rails. I tweet as @bonzoesc

Quick Disclaimer This used to be two presentations but I combined them. Thanks for your cooperation!

What is Rails? Ruby on Rails® is an open-source web framework that’s optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over con guration. - http://rubyonrails.org/

What is Rails? Rails is a way to build web applications quickly and be able to maintain them in the future.

What is Rails? Twitter Scribd Hulu Less Accounting Basecamp Shopify Groupon Get Satisfaction Lighthouse Urban Dictionary Github Kongregate

What is Rails? Four main parts

What is Rails? ActiveRecord turns database into Ruby objects

What is Rails? ActionController turns web requests into Ruby method calls

What is Rails? ActionView turns Ruby code into web responses

What is Rails? Railties turns the parts into Rails

History

So What? Rails 3 feels like Rails in the right places.

So What? Rails 3 is as exible as Merb.

The Speci cs

ActiveRecord Database interactions

ActiveRecord Classic @published = Post.ﬁnd( :all, :where=>{:published=>true}, :order=>'created_at desc' ) @unpublished = Post.ﬁnd( :all, :where=>:published=>false}, :order=>'created_at desc' )

ActiveRecord Arel @ordered = Post.order('created_at asc') @published = @ordered.where(:published=>true) @unpublished = @ordered.where(:published=>false)

ActiveRecord Arel Compositional Chainable Less code Lazy

ActiveModel Put the ActiveRecord features you love on plain, non-database objects

ActiveModel Validations Serialization (JSON, XML) Callbacks (before_save) Translations

ActionController Handling requests

Responder Exposed to the developer for the rst time

Responder Allows precise yet reusable control of how responses are generated

Responder class EpisodesController < ApplicationController respond_to :html, :xml, :json def index @episodes = Episode.all respond_with @episodes end end

CSRF Protection Cross-Site Request Forgery is an attack allowing an attacker to impersonate a user.

CSRF Protection 1. User clicks link in a friend’s tweet to http://evilsite.us/

CSRF Protection 2. User clicks play on a video on http://evilsite.us/

CSRF Protection 3. User ends up tweeting link to http://evilsite.us/

CSRF Protection Note that Twitter isn’t vulnerable to this.

CSRF Protection Note that Twitter isn’t vulnerable to this. They use Rails’ built-in CSRF protection.

CSRF Protection Enabled by default Transparent Use the built-in form builders

ActionView Producing responses

XSS Protection Cross Site Scripting is a class of attack allowing an attacker to execute code on a user’s web browser.

XSS Protection 1. User watches video on YouTube

XSS Protection 2. Malicious code in the comments cause the user to post malicious code in videos they’re previously watched.

XSS Protection Rails 3 has protection for this built in and enabled by default. Think hard before using raw output in views.

A side note Curious about CSRF and XSS attacks? Hack Miami had presentations about these vulnerabilities on Saturday, September 18. Hop in your DeLorean to learn more! http://hackmiami.org/

Unobtrusive JavaScript Rails 1 & 2 injected JavaScript into pages to make AJAX features work.

Unobtrusive JavaScript Rails 3 annotates the HTML with special properties.

Unobtrusive JavaScript There are drivers for Prototype, jQuery, and more.

No more scripts/* The scripts directory used to contain tools for generating and running your application.

No more scripts/* Rails 3 does this with the rails tool.

Big Changes ActiveRecord: Arel, ActiveModel ActionController: CSRF protection, ActionController::Responder ActionView: XSS Protection, Unobtrusive JavaScript Railties: No more scripts/*

Authorization with OAuth

Authentication Authentication is proving who you are.

Authentication •Driver’s license •Passport •Fingerprint on le

Authorization Authorization is letting something happen on your behalf.

Authorization •Signature on a contract •Key in your car’s ignition •Verbal permission

Authentication and Authorization Two security primitives that taste great together!

On the Web

The Old Stupid Way

The Old Stupid Way • You want TripIt to read your address book. • You don’t want TripIt to read all your email.

Another Bad Idea

Another Bad Idea • How do you revoke access? • How do you revoke access to only one client? • How do you ensure clients only do certain things?

OAuth An open protocol to allow secure API authorization in a simple and standard method from desktop and web applications. - http://oauth.net/

OAuth OAuth lets you limit and control client applications working on your behalf.

OAuth Facebook Yahoo Twitter Net ix Github Picomoney Google 37signals

An OAuth Session 1.You nd a useful website that reads your friends’ tweets about movies, and adds them to your Net ix queue.

An OAuth Session 2.You click the “Connect with Net ix” button, and are redirected to: https://api-user.net ix.com/

An OAuth Session 3.You enter your Net ix account information, and are returned to the client website.

An OAuth Session 4.You click the “Connect with Twitter” button, and are redirected to: https://api.twitter.com/

An OAuth Session 5.You enter your Twitter account information, and are returned to the client website.

An OAuth Session The client application gets tokens for each service.

An OAuth Session If you decide (at any time) to quit using the service, you can visit Twitter and Net ix and revoke its authorization.

An OAuth Session

The Guts 1. The consumer (client) asks the provider (server) for a new blank request token, and sends the user to the provider with that request token.

The Guts 2. The user authenticates with the provider, and accepts (or denies) the authorization the consumer wants.

The Guts 3. The user is redirected back to the consumer with a request token bound to that user.

The Guts 4. The consumer gives the request token to the server in exchange for an access token.

The Guts 5. The consumer can use the access token as authorization.

OAuth 2 OAuth 1.0a and 2 are different and incompatible.

OAuth 1 or 2? If you’re making a consumer, the provider made that choice for you.

OAuth 1 or 2? If you’re making a provider, OAuth 2.

Getting Started

I Didn’t Finish My Demo

Photo Credits http://www. ickr.com/photos/lazytom/320269269/ http://www. ickr.com/photos/andrewmbutler/428388719/ http://www. ickr.com/photos/emdurso/2686817699/ http://www. ickr.com/photos/beleaveme/1871344753/ http://www. ickr.com/photos/beleaveme/4676893419/ http://www. ickr.com/photos/scottobear/186001665/ (pretty smug about Tri-Rail photos in a Rails 3 presentation)

Photo Credits http://www. ickr.com/photos/95453014@N00/451238739/ http://www. ickr.com/photos/mattkieffer/4671197999/ http://www. ickr.com/photos/italintheheart/4018162624/ http://www. ickr.com/photos/spbutterworth/2756176408/ http://www. ickr.com/photos/gesteves/3336482837/

Look at Stuff http://db.tt/wDfs5nd - slides (keynote & pdf) http://bit.ly/r3oauth - half- nished source http://twitter.com/bonzoesc

Questions

Thanks!

What I’m Using • Ruby 1.8.7 • Rails 3 • “twitter” gem

Follow along! The hexits at the bottom of the slide are a git commit number. http://bit.ly/r3oauth

Build the Skeleton > rails new oauthdemo fbdb7051

Add Gems Gem le: gem 'oauth' > bundle install 96919add

Start the Server > rails s

Add a Users table > rails g model user screen_name:string twitter_token:string twitter_secret:string 3473158b

Stub Controller > rails g controller authorization new show 767512e2

Stub Controller con g/routes.rb: Oauthdemo::Application.routes.draw do resource :authorization app/controllers/authorization_controller.rb: class AuthorizationController < ApplicationController … def create end def destroy end 2dd53ba0

OAuth Con guration con g/initializers/twitter.rb: TWITTER_OAUTH_TOKENS = { :key=>'DCtwdGNS38Sr9JN…', :secret=>'gJ6RN7Nblq9t…' } bb1dd05b

Rails 3 and OAuth for Barcamp Tampa

by Bryce Kerley on Oct 15, 2010

Accessibility

Categories

Tags

Upload Details

Usage Rights

Statistics

Rails 3 and OAuth for Barcamp Tampa — Presentation Transcript