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JWT

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“jot”

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JSON Web Tokens

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José Padilla

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Flickr: Bryan Vincent

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Co-founder at blimp.io

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/jpadilla

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jpadilla.com

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Why?

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Single Sign-on

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Action Links

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Webhooks

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Token-based Auth

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What?

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“Compact URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is digitally signed using JSON Web Signature (JWS).” - IETF.

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JOSE

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JavaScript Object Signing and Encryption

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JWA

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JSON Web Algorithms

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JWK

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JSON Web Key

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JWT

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JSON Web Token

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JWS

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JSON Web Signature

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JWE

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JSON Web Encryption

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Today it’s all about JWT

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How?

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Internet-Draft

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eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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{ "typ": "JWT", "alg": "HS256" } eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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import json import hmac from hashlib import sha256 from base64 import urlsafe_b64encode ! segments = [] ! header_dict = { 'typ':'JWT', 'alg': 'HS256' } ! json_header = json.dumps(header_dict) ! header = urlsafe_b64encode(json_header).rstrip('=') segments.append(header) eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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{! "user_id": 1! } eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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payload_dict = { 'user_id': 1 } ! json_payload = json.dumps(payload) ! payload = urlsafe_b64encode(json_payload).rstrip('=') segments.append(payload) eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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SECRET = 'abc123' ! signing_input = '.'.join(segments) ! sig = hmac.new(SECRET, signing_input, sha256) signature = urlsafe_b64encode(sig.digest()).rstrip('=') segments.append(signature) ! token = '.'.join(segments) eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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eyJ0eXAiOiJKV1QiLCJhbGciOi JIUzI1NiJ9.eyJ1c2VyX2lkIjo xfQ.xpCS8TTq1a53OIps1ByTdm 6Sh-A1ZoCId3e2YYWjapU

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PyJWT

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$ pip install PyJWT

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import jwt ! SECRET_KEY = "abc123" payload = {"user_id": 1} ! jwt_token = jwt.encode(payload, SECRET_KEY) ! payload = jwt.decode(jwt_token, SECRET_KEY)

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/progrium/pyjwt

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Django JWT Auth

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username/password JWT Error /login

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Authorization: Bearer JWT Error /restricted

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$ pip install django-jwt

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import json ! from django.views.generic import View from django.http import HttpResponse ! from jwt_auth.mixins import JSONWebTokenAuthMixin ! ! class RestrictedView(JSONWebTokenAuthMixin, View): def get(self, request): data = json.dumps({ 'foo': 'bar' }) return HttpResponse(data, content_type='application/json')

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from django.conf.urls import patterns from .views import RestrictedView urlpatterns = patterns( '', ! (r'^login/$', 'jwt_auth.views.obtain_jwt_token'), (r'^restricted/$', RestrictedView.as_view()), )

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/jpadilla/django-jwt-auth

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DRF JWT Auth

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$ pip install djangorestframework-jwt

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from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.permissions import IsAuthenticated from rest_framework_jwt.authentication import JSONWebTokenAuthentication class RestrictedView(APIView): permission_classes = (IsAuthenticated, ) authentication_classes = (JSONWebTokenAuthentication, ) def get(self, request): data = { 'foo': 'bar' } ! return Response(data)

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from django.conf.urls import patterns from .views import RestrictedView urlpatterns = patterns( '', ! (r'^login/', 'rest_framework_jwt.views.obtain_jwt_token'), (r'^restricted/$', RestrictedView.as_view()), )

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var url = 'http://localhost:8000/login/', creds = { username: 'admin', password: 'abc123' }; $.post(url, creds, function(auth) { $.ajax({ type: 'GET', url: 'http://localhost:8000/restricted/', beforeSend: function(xhr) { xhr.setRequestHeader("Authorization", "Bearer " + auth.token); }, success: function(data){ console.log(data); // { // foo: "bar" // } } }); });

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/GetBlimp/django-rest-framework-jwt

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Recap • It’s a standard • It’s simple • Third party libraries • Single Sign-on • Action links • Authentication • CORS • Stateless • No CSRF • CDN • Mobile/WebSockets

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Django REST
 Framework Sprint

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Thanks Questions? http:/ /bit.ly/djangocon-jwt