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LICENSE
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app.py
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# -*- coding: utf-8 -*-
# Copyright 2015 Okta, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import os
import uuid
from flask import (
Flask,
redirect,
render_template,
request,
session,
url_for,
)
from flask.ext.login import (
LoginManager,
UserMixin,
current_user,
login_required,
login_user,
logout_user,
)
from flask_bootstrap import Bootstrap
from saml2 import (
BINDING_HTTP_POST,
BINDING_HTTP_REDIRECT,
entity,
)
from saml2.client import Saml2Client
from saml2.config import Config as Saml2Config
import requests
# metadata_url_for contains PER APPLICATION configuration settings.
# Each SAML service that you support will have different values here.
#
# NOTE:
# This is implemented as a dictionary for DEMONSTRATION PURPOSES ONLY.
# On a production system, this information should be stored as approprate
# for your concept of "customer company", "group", "organization", or "team"
metadata_url_for = {
# For testing with http://saml.oktadev.com use the following:
# 'test': 'http://idp.oktadev.com/metadata',
# WARNING WARNING WARNING
# You MUST remove the testing IdP from a production system,
# as the testing IdP will allow ANYBODY to log in as ANY USER!
# WARNING WARNING WARNING
}
app = Flask(__name__)
Bootstrap(app)
app.secret_key = str(uuid.uuid4()) # Replace with your secret key
login_manager = LoginManager()
login_manager.setup_app(app)
logging.basicConfig(level=logging.DEBUG)
# NOTE:
# This is implemented as a dictionary for DEMONSTRATION PURPOSES ONLY.
# On a production system, this information must come
# from your system's user store.
user_store = {}
def saml_client_for(idp_name=None):
'''
Given the name of an IdP, return a configuation.
The configuration is a hash for use by saml2.config.Config
'''
if idp_name not in metadata_url_for:
raise Exception("Settings for IDP '{}' not found".format(idp_name))
acs_url = url_for(
"idp_initiated",
idp_name=idp_name,
_external=True)
# NOTE:
# Ideally, this should fetch the metadata and pass it to
# PySAML2 via the "inline" metadata type.
# However, this method doesn't seem to work on PySAML2 v2.4.0
#
# SAML metadata changes very rarely. On a production system,
# this data should be cached as approprate for your production system.
rv = requests.get(metadata_url_for[idp_name])
import tempfile
tmp = tempfile.NamedTemporaryFile()
f = open(tmp.name, 'w')
f.write(rv.text)
f.close()
settings = {
'metadata': {
# 'inline': metadata,
"local": [tmp.name]
},
'service': {
'sp': {
'endpoints': {
'assertion_consumer_service': [
(acs_url, BINDING_HTTP_REDIRECT),
(acs_url, BINDING_HTTP_POST)
],
},
# Don't verify that the incoming requests originate from us via
# the built-in cache for authn request ids in pysaml2
'allow_unsolicited': True,
# Don't sign authn requests, since signed requests only make
# sense in a situation where you control both the SP and IdP
'authn_requests_signed': False,
'logout_requests_signed': True,
'want_assertions_signed': True,
'want_response_signed': False,
},
},
}
spConfig = Saml2Config()
spConfig.load(settings)
spConfig.allow_unknown_attributes = True
saml_client = Saml2Client(config=spConfig)
tmp.close()
return saml_client
class User(UserMixin):
def __init__(self, user_id):
user = {}
self.id = None
self.first_name = None
self.last_name = None
try:
user = user_store[user_id]
self.id = unicode(user_id)
self.first_name = user['first_name']
self.last_name = user['last_name']
except:
pass
@login_manager.user_loader
def load_user(user_id):
return User(user_id)
@app.route("/")
def main_page():
return render_template('main_page.html', idp_dict=metadata_url_for)
@app.route("/saml/sso/<idp_name>", methods=['POST'])
def idp_initiated(idp_name):
saml_client = saml_client_for(idp_name)
authn_response = saml_client.parse_authn_request_response(
request.form['SAMLResponse'],
entity.BINDING_HTTP_POST)
authn_response.get_identity()
user_info = authn_response.get_subject()
username = user_info.text
# This is what as known as "Just In Time (JIT) provisioning".
# What that means is that, if a user in a SAML assertion
# isn't in the user store, we create that user first, then log them in
if username not in user_store:
user_store[username] = {
'first_name': authn_response.ava['FirstName'][0],
'last_name': authn_response.ava['LastName'][0],
}
user = User(username)
session['saml_attributes'] = authn_response.ava
login_user(user)
url = url_for('user')
# NOTE:
# On a production system, the RelayState MUST be checked
# to make sure it doesn't contain dangerous URLs!
if 'RelayState' in request.form:
url = request.form['RelayState']
return redirect(url)
@app.route("/saml/login/<idp_name>")
def sp_initiated(idp_name):
saml_client = saml_client_for(idp_name)
reqid, info = saml_client.prepare_for_authenticate()
redirect_url = None
# Select the IdP URL to send the AuthN request to
for key, value in info['headers']:
if key is 'Location':
redirect_url = value
response = redirect(redirect_url, code=302)
# NOTE:
# I realize I _technically_ don't need to set Cache-Control or Pragma:
# http://stackoverflow.com/a/5494469
# However, Section 3.2.3.2 of the SAML spec suggests they are set:
# http://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
# We set those headers here as a "belt and suspenders" approach,
# since enterprise environments don't always conform to RFCs
response.headers['Cache-Control'] = 'no-cache, no-store'
response.headers['Pragma'] = 'no-cache'
return response
@app.route("/user")
@login_required
def user():
return render_template('user.html', session=session)
@app.errorhandler(401)
def error_unauthorized(error):
return render_template('unauthorized.html')
@app.route("/logout")
@login_required
def logout():
logout_user()
return redirect(url_for("main_page"))
if __name__ == "__main__":
port = int(os.environ.get('PORT', 5000))
if port == 5000:
app.debug = True
app.run(host='0.0.0.0', port=port)

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requirements.txt
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Flask==0.10.1
Flask-Bootstrap==3.3.2.1
Flask-Login==0.2.11
pysaml2==2.4.0

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templates/base.html
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{% extends "bootstrap/base.html" %}
{% set application_name = 'PySAML2 Example SAML SP' %}
{% block title %}{{ application_name }}{% endblock %}
{% block body_attribs %} style="padding-top: 60px"{% endblock %}
{% block navbar %}
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="{{ url_for('main_page') }}">{{ application_name }}</a>
</div>
<div id="navbar" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
{% if current_user.is_authenticated() %}
<li><a href="{{ url_for('user') }}">User</a></li>
<li><a href="{{ url_for('logout') }}">Logout</a></li>
{% endif %}
</ul>
</div><!--/.nav-collapse -->
</div>
</nav>
<div class="container">
{% endblock %}
{% block content %}
</div>
{% endblock %}

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templates/main_page.html
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{% extends 'base.html' %}
{% block content %}
<p class="lead">Select the IdP you want to use to authenticate:</p>
<ol>
{% for idp in idp_dict.keys() %}
<li><a href="/saml/login/{{idp}}">{{idp}}</a></li>
{% endfor %}
</ol>
{% endblock %}

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templates/unauthorized.html
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{% extends 'base.html' %}
{% block content %}
<h1>Unauthorized</h1>
<p>
The server could not verify that you are authorized to access the URL requested. You either supplied the wrong credentials (e.g. a bad password), or your browser doesn't understand how to supply the credentials required.
</p>
{% endblock %}

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templates/user.html
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{% extends 'base.html' %}
{% block content %}
<div class="container">
<h1>Logged in</h1>
<p class="lead">
Contents of the most recent SAML assertion:
</p>
<div class="col-md-8">
<table class="table">
{% if session.saml_attributes %}
{% for attribute in session.saml_attributes.keys() %}
<tr>
<td>{{ attribute }}</td>
<td>{{ session.saml_attributes[attribute][0] }}</td>
</tr>
{% endfor %}
{% endif %}
</table>
</div>
</div>
{% endblock %}
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