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# Copyright 2015 INFN |
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# All Rights Reserved. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); you may |
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# not use this file except in compliance with the License. You may obtain |
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# 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, WITHOUT |
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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# License for the specific language governing permissions and limitations |
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# under the License. |
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""" |
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SSO FLASK Application for Discourse |
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The configuration file is defined with the variable "DISCOURSE_SSO_CONFIG", |
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for the most significant values look at the sso/default.py file |
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""" |
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from flask import abort, Flask, redirect, render_template, request, url_for, \ |
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session |
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import base64 |
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import hashlib |
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import hmac |
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import urllib |
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import re |
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app = Flask(__name__) |
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app.config.from_object('discourseSSO.default.Config') |
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app.config.from_pyfile('config.py') |
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app.config.from_envvar('DISCOURSE_SSO_CONFIG', True) |
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@app.route('/sso/login') |
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def payload_check(): |
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""" |
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Verify the payload and signature coming from a Discourse server and if |
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correct redirect to the authentication page |
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:return: The redirection page to the authentication page |
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""" |
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payload = request.args.get('sso', '') |
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signature = request.args.get('sig', '') |
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app.logger.debug('Request to login with payload="%s" signature="%s"', |
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payload, signature) |
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if not payload or not signature: |
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abort(400) |
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app.logger.debug('Session Secret Key: %s', |
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app.secret_key) |
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app.logger.debug('SSO Secret Key: %s', |
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app.config.get('DISCOURSE_SECRET_KEY')) |
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dig = hmac.new( |
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app.config.get('DISCOURSE_SECRET_KEY'), |
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payload, |
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hashlib.sha256 |
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).hexdigest() |
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app.logger.debug('Calculated hash: %s', dig) |
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if dig != signature: |
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abort(400) |
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decoded_msg = base64.decodestring(payload) |
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session['nonce'] = decoded_msg |
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return redirect(url_for('user_authz')) |
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@app.route('/sso/auth') |
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def user_authz(): |
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""" |
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Read the user attributes provided by the application server (generally |
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it is apache httpd) as environment variables and create the payload to |
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send to discourse |
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:return: The redirection page to Discourse |
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""" |
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attribute_map = app.config.get('DISCOURSE_USER_MAP') |
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user_flag_filters = app.config.get('DISCOURSE_USER_FLAGS') |
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email = request.environ.get(attribute_map['email']) |
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external_id = request.environ.get(attribute_map['external_id']) |
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if not (email and external_id): |
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abort(403) |
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name_list = [] |
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for name_to_map in attribute_map['name']: |
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if request.environ.get(name_to_map): |
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name_list.append(request.environ.get(name_to_map)) |
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name = ' '.join(name_list) |
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if request.environ.get(attribute_map['username']): |
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username = request.environ.get(attribute_map['username']) |
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else: |
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username = (name.replace(' ', '') + |
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"_" + |
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hashlib.md5(email).hexdigest()[0:4] |
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) |
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avatar_url = request.environ.get(attribute_map['avatar_url']) |
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bio = request.environ.get(attribute_map['bio']) |
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app.logger.debug('Authenticating "%s" with username "%s" and email "%s"', |
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name, username, email) |
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if 'nonce' not in session: |
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abort(403) |
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query = (session['nonce'] + |
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'&name=' + name + |
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'&username=' + username + |
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'&email=' + urllib.quote(email) + |
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'&external_id=' + urllib.quote(external_id)) |
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if avatar_url: |
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query = query + '&avatar_url=' + urllib.quote(avatar_url) |
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if bio: |
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query = query + '&bio=' + urllib.quote(bio) |
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flags = {} |
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for user_flag in user_flag_filters: |
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if 'filter' in user_flag: |
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filter = user_flag['filter'].split('=') |
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reg_exp = re.compile(filter[1]) |
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if (request.environ.get(filter[0]) and |
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reg_exp.match(request.environ.get(filter[0]))): |
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flags[user_flag['name']] = user_flag['value'] |
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else: |
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flags[user_flag['name']] = user_flag['value'] |
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for flags_name in sorted(flags.keys()): |
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query = query + '&' + flags_name + '=' + flags[flags_name] |
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app.logger.debug('Query string to return: %s', query) |
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query_b64 = base64.encodestring(query) |
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app.logger.debug('Base64 query string to return: %s', query_b64) |
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query_urlenc = urllib.quote(query_b64) |
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app.logger.debug('URLEnc query string to return: %s', query_urlenc) |
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sig = hmac.new( |
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app.config.get('DISCOURSE_SECRET_KEY'), |
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query_b64, |
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hashlib.sha256 |
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).hexdigest() |
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app.logger.debug('Signature: %s', sig) |
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redirect_url = (app.config.get('DISCOURSE_URL') + |
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'/session/sso_login?' |
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'sso=' + query_urlenc + |
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'&sig=' + sig) |
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return redirect(redirect_url) |
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@app.errorhandler(403) |
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def attribuete_not_provided(error): |
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""" |
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Render a custom error page in case the IdP authenticate the user but does |
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not provide the requested attributes |
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:type error: object |
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""" |
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return render_template('403.html'), 403 |
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fmarco76 /
DiscourseSSO
