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