419 lines
17 KiB
Python
419 lines
17 KiB
Python
"""
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Dispatcher for basic auth form authentifications
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"""
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import Cookie
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import base64
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import copy
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import re
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import os
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import traceback
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import urllib
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import mandaye
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from cookielib import CookieJar
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from datetime import datetime
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from lxml.html import fromstring
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from urlparse import parse_qs
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from mandaye import config, __version__
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from mandaye.exceptions import MandayeException
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from mandaye.log import logger
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from mandaye.http import HTTPResponse, HTTPHeader, HTTPRequest
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from mandaye.response import _500, _302, _401
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from mandaye.response import template_response
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from mandaye.server import get_response
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from mandaye.backends.default import Association
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try:
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from Crypto.Cipher import AES
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except ImportError:
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config.encrypt_sp_password = False
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class AuthForm(object):
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def __init__(self, env, mapper):
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"""
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env: WSGI environment
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mapper: mapper's module like mandaye.mappers.linuxfr
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"""
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self.env = env
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self.urls = mapper.urls
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self.site_name = self.env["mandaye.config"]["site_name"]
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self.form_values = mapper.form_values
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if not self.form_values.has_key('form_headers'):
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self.form_values['form_headers'] = {
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'Content-Type': 'application/x-www-form-urlencoded',
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'User-Agent': 'Mozilla/5.0 Mandaye/%s' % __version__
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}
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if not self.form_values.has_key('post_fields') or \
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not self.form_values.has_key('username_field') or \
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not self.form_values.has_key('login_url'):
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logger.critical("Bad configuration: AuthForm form_values dict must have \
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this keys: post_fields and username_field")
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raise MandayeException, 'AuthForm bad configuration'
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if not self.form_values.has_key('form_attrs') and \
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not self.form_values.has_key('post_url'):
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logger.critical("Bad configuration: you must set form_attrs or post_url")
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if config.encrypt_secret and not self.form_values.has_key('password_field'):
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logger.critical("Bad configuration: AuthForm form_values dict must have a \
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a password_field key if you want to encode a password.")
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raise MandayeException, 'AuthForm bad configuration'
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self.login_url = self.form_values.get('login_url')
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if not self.form_values.has_key('post_fields'):
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self.form_values['post_fields'] = []
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def get_default_mapping(self):
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mapping = [
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{
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'path': r'%s$' % self.urls.get('logout_url', '/mandaye/logout'),
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'on_response': [{'auth': 'slo'}]
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},
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]
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if config.a2_auto_connection:
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mapping.append({
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'path': r'/',
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'response': {
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'filter': self.auto_connection,
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'condition': self.is_connected_a2
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}
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})
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return mapping
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def encrypt_pwd(self, password):
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""" This method allows you to encrypt a password
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To use this feature you muste set encrypt_sp_password to True
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in your configuration and set a secret in encrypt_secret
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Return encrypted password
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"""
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if config.encrypt_secret:
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logger.debug("Encrypt password")
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try:
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cipher = AES.new(config.encrypt_secret, AES.MODE_CFB, "0000000000000000")
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password = cipher.encrypt(password)
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password = base64.b64encode(password)
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return password
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except Exception, e:
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if config.debug:
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traceback.print_exc()
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logger.warning('Password encrypting failed %s' % e)
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else:
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logger.warning("You must set a secret to use pwd encryption")
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def decrypt_pwd(self, password):
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""" This method allows you to dencrypt a password encrypt with
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encrypt_pwd method. To use this feature you muste set
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encrypt_sp_password to True in your configuration and
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set a secret in encrypt_secret
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Return decrypted password
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"""
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if config.encrypt_secret:
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logger.debug("Decrypt password")
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try:
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cipher = AES.new(config.encrypt_secret, AES.MODE_CFB, "0000000000000000")
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password = base64.b64decode(password)
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password = cipher.decrypt(password)
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return password
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except Exception, e:
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if config.debug:
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traceback.print_exc()
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logger.warning('Decrypting password failed: %r', e)
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else:
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logger.warning("You must set a secret to use pwd decryption")
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def get_current_unique_id(self, env):
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if env['beaker.session'].has_key('unique_id'):
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return env['beaker.session']['unique_id']
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return None
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def replay(self, env, post_values):
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""" replay the login / password
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env: WSGI env with beaker session and the target
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post_values: dict with the field name (key) and the field value (value)
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"""
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logger.debug("authform.replay post_values: %r", post_values)
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cj = CookieJar()
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request = HTTPRequest()
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action = self.form_values.get('post_url')
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auth_form = None
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# if there is a form parse it
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if not "://" in self.login_url:
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self.login_url = os.path.join(env['target'].geturl(), self.login_url)
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login = get_response(env, request, self.login_url, cj)
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if login.code == 502:
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return login
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if self.form_values.has_key('form_attrs'):
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html = fromstring(login.msg)
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for form in html.forms:
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is_good = True
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for key, value in self.form_values['form_attrs'].iteritems():
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if form.get(key) != value:
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is_good = False
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if is_good:
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auth_form = form
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break
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if auth_form == None:
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logger.critical("%r %r: can't find login form on %r",
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env['HTTP_HOST'], env['PATH_INFO'], self.login_url)
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return _500(env['PATH_INFO'], "Replay: Can't find login form")
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params = {}
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for input in auth_form.inputs:
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if input.name and input.type != 'button':
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if input.value:
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params[input.name] = input.value.encode('utf-8')
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else:
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params[input.name] = ''
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for key, value in post_values.iteritems():
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params[key] = value
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else:
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params = post_values
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if not self.form_values.has_key('post_url'):
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if len(auth_form) and not auth_form.action:
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logger.critical("%r %r: don't find form action on %r",
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env['HTTP_HOST'], env['PATH_INFO'], self.login_url)
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return _500(env['PATH_INFO'], 'Replay: form action not found')
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action = auth_form.action
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if not "://" in action:
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login_url = re.sub(r'\?.*$', '', self.login_url)
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action = os.path.join(login_url, action)
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cookies = login.cookies
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headers = HTTPHeader()
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headers.load_from_dict(self.form_values['form_headers'])
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params = urllib.urlencode(params)
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request = HTTPRequest(cookies, headers, "POST", params)
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return get_response(env, request, action, cj)
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def _save_association(self, env, unique_id, post_values):
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""" save an association in the database
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env: wsgi environment
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unique_id: idp uinique id
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post_values: dict with the post values
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"""
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logger.debug('AuthForm._save_association: save a new association')
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sp_login = post_values[self.form_values['username_field']]
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if config.encrypt_sp_password:
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password = self.encrypt_pwd(post_values[self.form_values['password_field']])
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post_values[self.form_values['password_field']] = password
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asso_id = Association.update_or_create(self.site_name, sp_login,
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post_values, unique_id)
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old_association_id = env['beaker.session'].get('old_association_id')
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if old_association_id and old_association_id != asso_id:
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Association.delete(old_association_id)
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env['beaker.session']['old_association_id'] = None
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env['beaker.session']['unique_id'] = unique_id
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env['beaker.session'][self.site_name] = asso_id
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env['beaker.session'].save()
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def associate_submit(self, env, values, request, response):
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""" Associate your login / password into your database
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"""
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logger.debug("Trying to associate a user")
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unique_id = env['beaker.session'].get('unique_id')
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if request.msg:
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if not unique_id:
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logger.warning("Association failed: user isn't login on Mandaye")
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return _302(self.urls.get('connection_url'))
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if type(request.msg) == str:
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post = parse_qs(request.msg, request)
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else:
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post = parse_qs(request.msg.read(), request)
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logger.debug("association post: %r", post)
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qs = parse_qs(env['QUERY_STRING'])
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for key, value in qs.iteritems():
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qs[key] = value[0]
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post_fields = self.form_values['post_fields']
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post_values = {}
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for field in post_fields:
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if not post.has_key(field):
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logger.info('Association auth failed: form not correctly filled')
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logger.info('%r is missing', field)
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qs['type'] = 'badlogin'
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return _302(self.urls.get('associate_url') + "?%s" % urllib.urlencode(qs))
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post_values[field] = post[field][0]
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response = self.replay(env, post_values)
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if eval(values['condition']):
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logger.debug("Replay works: save the association")
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self._save_association(env, unique_id, post_values)
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if qs.has_key('next_url'):
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return _302(qs['next_url'], response.cookies)
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return response
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logger.info('Auth failed: Bad password or login')
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qs['type'] = 'badlogin'
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return _302(self.urls.get('associate_url') + "?%s" % urllib.urlencode(qs))
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def _login_sp_user(self, association, env, condition, values):
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""" Log in sp user
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"""
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if not association['sp_login']:
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return _500(env['PATH_INFO'],
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'Invalid values for AuthFormDispatcher.login')
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post_values = copy.copy(association['sp_post_values'])
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if config.encrypt_sp_password:
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password = self.decrypt_pwd(post_values[self.form_values['password_field']])
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post_values[self.form_values['password_field']] = password
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response = self.replay(env, post_values)
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qs = parse_qs(env['QUERY_STRING'])
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if condition and eval(condition):
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Association.update_last_connection(association['id'])
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env['beaker.session']['old_association_id'] = None
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env['beaker.session'][self.site_name] = association['id']
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env['beaker.session'].save()
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if qs.has_key('next_url'):
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return _302(qs['next_url'][0], response.cookies)
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else:
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return response
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else:
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env['beaker.session']['old_association_id'] = association['id']
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env['beaker.session'].save()
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return _302(self.urls.get('associate_url') + "?type=failed")
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def login(self, env, values, request, response):
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""" Automatic login on a site with a form
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"""
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# Specific method to get current idp unique id
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unique_id = self.get_current_unique_id(env)
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logger.debug('Trying to login on Mandaye')
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if not unique_id:
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return _401('Access denied: invalid token')
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# FIXME: hack to force beaker to generate an id
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# somtimes beaker doesn't do it by himself
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env['beaker.session'].regenerate_id()
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env['beaker.session']['unique_id'] = unique_id
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env['beaker.session'].save()
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logger.debug('User %s successfully login' % env['beaker.session']['unique_id'])
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association = Association.get_last_connected(self.site_name, unique_id)
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if not association:
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logger.debug('User %s is not associate' % env['beaker.session']['unique_id'])
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return _302(self.urls.get('associate_url') + "?type=first")
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return self._login_sp_user(association, env, values['condition'], values)
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def logout(self, env, values, request, response):
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""" Destroy the Beaker session
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"""
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logger.debug('Logout from Mandaye')
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env['beaker.session'].delete()
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return response
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def auto_connection(self, env, values, request, response):
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connection_url = self.urls["connection_url"]
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logger.debug("Redirection using url : %s" % connection_url)
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return _302(connection_url)
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def local_logout(self, env, values, request, response):
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logger.info('SP logout initiated by Mandaye')
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self.logout(env, values, request, response)
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next_url = None
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qs = parse_qs(env['QUERY_STRING'])
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if qs.has_key('RelayState'):
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next_url = qs['RelayState'][0]
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elif qs.has_key('next_url'):
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next_url = qs['next_url'][0]
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elif values.has_key('next_url'):
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next_url = values['next_url']
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logout_url = None
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if self.env['mandaye.config'].has_key('sp_logout_url'):
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logout_url = self.env['mandaye.config'].get('sp_logout_url')
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elif self.env['mandaye.config'].has_key('saml2_sp_logout_url'):
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logger.warning("Deprecated saml2_sp_logout_url optioin use sp_logout_url instead")
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logout_url = self.env['mandaye.config'].get('saml2_sp_logout_url')
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req_cookies = request.cookies
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if not logout_url:
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logger.warning('sp_logout_url not set into vhost configuration only removing cookies')
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for cookie in req_cookies.values():
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cookie['expires'] = 'Thu, 01 Jan 1970 00:00:01 GMT'
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cookie['path'] = self.env['mandaye.config'].get('cookies_path', '/')
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if next_url:
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return _302(next_url, req_cookies)
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else:
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return _302('/', req_cookies)
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request = HTTPRequest(req_cookies)
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response = get_response(env, request, logout_url)
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if next_url:
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return _302(next_url, response.cookies)
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else:
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return response
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def change_user(self, env, values, request, response):
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""" Multi accounts feature
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Change the current login user
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You must call this method into a response filter
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This method must have a query string with a username parameter
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"""
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# TODO: need to logout the first
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unique_id = env['beaker.session']['unique_id']
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qs = parse_qs(env['QUERY_STRING'])
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if not qs.has_key('id') and not unique_id:
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return _401('Access denied: beaker session invalid or not qs id')
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if qs.has_key('id'):
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asso_id = qs['id'][0]
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association = Association.get_by_id(asso_id)
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else:
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association = Association.get_last_connected(self.site_name, unique_id)
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if not association:
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return _302(self.urls.get('associate_url'))
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return self._login_sp_user(association, env, 'response.code==302', values)
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def disassociate(self, env, values, request, response):
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""" Disassociate an account with the Mandaye account
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You need to put the id of the sp user you want to disassociate
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in the query string (..?id=42) or use by service provider name
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(..?sp_name=)
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"""
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if env['beaker.session'].has_key('unique_id'):
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unique_id = env['beaker.session']['unique_id']
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else:
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return _401('Access denied: no session')
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qs = parse_qs(env['QUERY_STRING'])
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if values.get('next_url'):
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next_url = values.get('next_url')
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else:
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next_url = '/'
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if qs.has_key('next_url'):
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next_url = qs['next_url'][0]
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if qs.has_key('id'):
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asso_id = qs['id'][0]
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if Association.has_id(asso_id):
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Association.delete(asso_id)
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if Association.get(self.site_name, unique_id):
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env['QUERY_STRING'] = ''
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return self.change_user(env, values, request, response)
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else:
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return _401('Access denied: bad id')
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elif qs.has_key('sp_name'):
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sp_name = qs['sp_name'][0]
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for asso in \
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Association.get(sp_name, unique_id):
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Association.delete(asso['id'])
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else:
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return _401('Access denied: no id or sp name')
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values['next_url'] = next_url
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if qs.has_key('logout'):
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return self.local_logout(env, values, request, response)
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return _302(next_url)
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def is_connected_a2(self, env, request, response):
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""" Auto connection only which works only with Authentic2
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"""
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if request.cookies.has_key('A2_OPENED_SESSION') and\
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not env['beaker.session'].has_key('unique_id'):
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logger.info('Trying an auto connection')
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return True
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return False
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