221 lines
7.5 KiB
Python
221 lines
7.5 KiB
Python
import logging
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import datetime
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import importlib
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from functools import wraps
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from xml.etree import ElementTree as ET
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import requests
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import requests.exceptions
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import dateutil.parser
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from django.core.urlresolvers import reverse
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from django.template.loader import render_to_string
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from django.utils.timezone import make_aware, now, make_naive, is_aware
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from django.conf import settings
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import lasso
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from . import app_settings
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def create_metadata(request):
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entity_id = reverse('mellon_metadata')
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cache = getattr(settings, '_MELLON_METADATA_CACHE', {})
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if not entity_id in cache:
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login_url = reverse('mellon_login')
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logout_url = reverse('mellon_logout')
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public_keys = []
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for public_key in app_settings.PUBLIC_KEYS:
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if public_key.startswith('/'):
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# clean PEM file
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public_key = ''.join(file(public_key).read().splitlines()[1:-1])
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public_keys.append(public_key)
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name_id_formats = app_settings.NAME_ID_FORMATS
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cache[entity_id] = render_to_string('mellon/metadata.xml', {
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'entity_id': request.build_absolute_uri(entity_id),
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'login_url': request.build_absolute_uri(login_url),
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'logout_url': request.build_absolute_uri(logout_url),
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'public_keys': public_keys,
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'name_id_formats': name_id_formats,
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'default_assertion_consumer_binding': app_settings.DEFAULT_ASSERTION_CONSUMER_BINDING,
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})
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settings._MELLON_METADATA_CACHE = cache
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return settings._MELLON_METADATA_CACHE[entity_id]
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SERVERS = {}
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def create_server(request):
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logger = logging.getLogger(__name__)
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root = request.build_absolute_uri('/')
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if root not in SERVERS:
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idps = get_idps()
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metadata = create_metadata(request)
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if app_settings.PRIVATE_KEY:
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private_key = app_settings.PRIVATE_KEY
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private_key_password = app_settings.PRIVATE_KEY_PASSWORD
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elif app_settings.PRIVATE_KEYS:
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private_key = app_settings.PRIVATE_KEYS
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private_key_password = None
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if isinstance(private_key, (tuple, list)):
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private_key_password = private_key[1]
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private_key = private_key[0]
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else: # no signature
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private_key = None
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private_key_password = None
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server = lasso.Server.newFromBuffers(metadata,
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private_key_content=private_key,
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private_key_password=private_key_password)
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server.setEncryptionPrivateKeyWithPassword(private_key, private_key_password)
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for key in app_settings.PRIVATE_KEYS:
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password = None
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if isinstance(key, (tuple, list)):
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password = key[1]
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key = key[0]
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server.setEncryptionPrivateKeyWithPassword(key, password)
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for i, idp in enumerate(idps):
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if 'METADATA_URL' in idp and 'METADATA' not in idp:
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verify_ssl_certificate = get_setting(
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idp, 'VERIFY_SSL_CERTIFICATE')
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try:
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response = requests.get(idp['METADATA_URL'],
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verify=verify_ssl_certificate)
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response.raise_for_status()
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except requests.exceptions.RequestException, e:
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logger.error(u'retrieval of metadata URL %r failed with error %s for %d-th idp',
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idp['METADATA_URL'], e, i)
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continue
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metadata = response.content
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elif 'METADATA' in idp:
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if idp['METADATA'].startswith('/'):
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metadata = file(idp['METADATA']).read()
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else:
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logger.error(u'missing METADATA or METADATA_URL in %d-th idp', i)
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continue
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try:
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server.addProviderFromBuffer(lasso.PROVIDER_ROLE_IDP, metadata)
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except lasso.Error, e:
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logger.error(u'bad metadata in %d-th idp', i)
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logger.debug(u'lasso error: %s', e)
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continue
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idp['ENTITY_ID'] = ET.fromstring(metadata).attrib['entityID']
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idp['METADATA'] = metadata
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SERVERS[root] = server
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return SERVERS[root]
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def create_login(request):
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server = create_server(request)
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login = lasso.Login(server)
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if not app_settings.PRIVATE_KEY and not app_settings.PRIVATE_KEYS:
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login.setSignatureHint(lasso.PROFILE_SIGNATURE_HINT_FORBID)
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return login
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def get_idp(entity_id):
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for adapter in get_adapters():
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if hasattr(adapter, 'get_idp'):
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idp = adapter.get_idp(entity_id)
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if idp:
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return idp
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return {}
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def get_idps():
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for adapter in get_adapters():
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if hasattr(adapter, 'get_idps'):
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for idp in adapter.get_idps():
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yield idp
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def flatten_datetime(d):
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d = d.copy()
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for key, value in d.iteritems():
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if isinstance(value, datetime.datetime):
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d[key] = value.isoformat() + 'Z'
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return d
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def iso8601_to_datetime(date_string):
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'''Convert a string formatted as an ISO8601 date into a time_t
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value.
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This function ignores the sub-second resolution'''
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dt = dateutil.parser.parse(date_string)
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if is_aware(dt):
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if not settings.USE_TZ:
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dt = make_naive(dt)
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else:
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if settings.USE_TZ:
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dt = make_aware(dt)
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return dt
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def get_seconds_expiry(datetime_expiry):
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return (datetime_expiry - now()).total_seconds()
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def to_list(func):
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@wraps(func)
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def f(*args, **kwargs):
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return list(func(*args, **kwargs))
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return f
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def import_object(path):
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module, name = path.rsplit('.', 1)
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module = importlib.import_module(module)
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return getattr(module, name)
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@to_list
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def get_adapters(idp={}):
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idp = idp or {}
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adapters = tuple(idp.get('ADAPTER', ())) + tuple(app_settings.ADAPTER)
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for adapter in adapters:
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yield import_object(adapter)()
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def get_values(saml_attributes, name):
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values = saml_attributes.get(name)
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if values is None:
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return ()
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if not isinstance(values, (list, tuple)):
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return (values,)
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return values
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def get_setting(idp, name, default=None):
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'''Get a parameter from an IdP specific configuration or from the main
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settings.
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'''
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return idp.get(name) or getattr(app_settings, name, default)
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def create_logout(request):
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logger = logging.getLogger(__name__)
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server = create_server(request)
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mellon_session = request.session.get('mellon_session', {})
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entity_id = mellon_session.get('issuer')
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session_index = mellon_session.get('session_index')
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name_id_format = mellon_session.get('name_id_format')
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name_id_content = mellon_session.get('name_id_content')
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name_id_name_qualifier = mellon_session.get('name_id_name_qualifier')
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name_id_sp_name_qualifier = mellon_session.get('name_id_sp_name_qualifier')
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session_dump = render_to_string('mellon/session_dump.xml', {
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'entity_id': entity_id,
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'session_index': session_index,
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'name_id_format': name_id_format,
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'name_id_content': name_id_content,
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'name_id_name_qualifier': name_id_name_qualifier,
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'name_id_sp_name_qualifier': name_id_sp_name_qualifier,
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})
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logger.debug('session_dump %s', session_dump)
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logout = lasso.Logout(server)
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if not app_settings.PRIVATE_KEY:
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logout.setSignatureHint(lasso.PROFILE_SIGNATURE_HINT_FORBID)
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logout.setSessionFromDump(session_dump)
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return logout
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def is_nonnull(s):
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return not '\x00' in s
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