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#!/usr/bin/python
#
# Copyright (C) 2014 Simo Sorce <simo@redhat.com>
#
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from ipsilon.providers.common import ProviderPageBase, ProviderException
from ipsilon.providers.saml2.provider import ServiceProvider
from ipsilon.providers.saml2.provider import InvalidProviderId
from ipsilon.providers.saml2.provider import NameIdNotAllowed
from ipsilon.util.user import UserSession
import cherrypy
import datetime
import lasso
class AuthenticationError(ProviderException):
def __init__(self, message, code):
super(AuthenticationError, self).__init__(message)
self.code = code
self._debug('%s [%s]' % (message, code))
class InvalidRequest(ProviderException):
def __init__(self, message):
super(InvalidRequest, self).__init__(message)
self._debug(message)
class UnknownProvider(ProviderException):
def __init__(self, message):
super(UnknownProvider, self).__init__(message)
self._debug(message)
class AuthenticateRequest(ProviderPageBase):
def __init__(self, *args, **kwargs):
super(AuthenticateRequest, self).__init__(*args, **kwargs)
self.STAGE_INIT = 0
self.STAGE_AUTH = 1
self.stage = self.STAGE_INIT
def auth(self, login):
try:
self.saml2checks(login)
except AuthenticationError, e:
self.saml2error(login, e.code, e.message)
return self.reply(login)
def _parse_request(self, message):
login = self.cfg.idp.get_login_handler()
try:
login.processAuthnRequestMsg(message)
except (lasso.ProfileInvalidMsgError,
lasso.ProfileMissingIssuerError), e:
msg = 'Malformed Request %r [%r]' % (e, message)
raise InvalidRequest(msg)
except (lasso.ProfileInvalidProtocolprofileError,
lasso.DsError), e:
msg = 'Invalid SAML Request: %r (%r [%r])' % (login.request,
e, message)
raise InvalidRequest(msg)
except (lasso.ServerProviderNotFoundError,
lasso.ProfileUnknownProviderError), e:
msg = 'Invalid SP [%s] (%r [%r])' % (login.remoteProviderId,
e, message)
raise UnknownProvider(msg)
self._debug('SP %s requested authentication' % login.remoteProviderId)
return login
def saml2login(self, request):
if not request:
raise cherrypy.HTTPError(400,
'SAML request token missing or empty')
try:
login = self._parse_request(request)
except InvalidRequest, e:
self._debug(str(e))
raise cherrypy.HTTPError(400, 'Invalid SAML request token')
except UnknownProvider, e:
self._debug(str(e))
raise cherrypy.HTTPError(400, 'Unknown Service Provider')
except Exception, e: # pylint: disable=broad-except
self._debug(str(e))
raise cherrypy.HTTPError(500)
return login
def saml2checks(self, login):
session = UserSession()
user = session.get_user()
if user.is_anonymous:
if self.stage < self.STAGE_AUTH:
session.save_data('saml2', 'stage', self.STAGE_AUTH)
session.save_data('saml2', 'Request', login.dump())
session.save_data('login', 'Return',
'%s/saml2/SSO/Continue' % self.basepath)
raise cherrypy.HTTPRedirect('%s/login' % self.basepath)
else:
raise AuthenticationError(
"Unknown user", lasso.SAML2_STATUS_CODE_AUTHN_FAILED)
self._audit("Logged in user: %s [%s]" % (user.name, user.fullname))
# TODO: check if this is the first time this user access this SP
# If required by user prefs, ask user for consent once and then
# record it
consent = True
# TODO: check destination
try:
provider = ServiceProvider(self.cfg, login.remoteProviderId)
nameidfmt = provider.get_valid_nameid(login.request.nameIdPolicy)
except NameIdNotAllowed, e:
raise AuthenticationError(
str(e), lasso.SAML2_STATUS_CODE_INVALID_NAME_ID_POLICY)
except InvalidProviderId, e:
raise AuthenticationError(
str(e), lasso.SAML2_STATUS_CODE_AUTHN_FAILED)
# TODO: check login.request.forceAuthn
login.validateRequestMsg(not user.is_anonymous, consent)
authtime = datetime.datetime.utcnow()
skew = datetime.timedelta(0, 60)
authtime_notbefore = authtime - skew
authtime_notafter = authtime + skew
us = UserSession()
user = us.get_user()
# TODO: get authentication type fnd name format from session
# need to save which login manager authenticated and map it to a
# saml2 authentication context
authn_context = lasso.SAML2_AUTHN_CONTEXT_UNSPECIFIED
timeformat = '%Y-%m-%dT%H:%M:%SZ'
login.buildAssertion(authn_context,
authtime.strftime(timeformat),
None,
authtime_notbefore.strftime(timeformat),
authtime_notafter.strftime(timeformat))
nameid = None
if nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_PERSISTENT:
# TODO map to something else ?
nameid = provider.normalize_username(user.name)
elif nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_TRANSIENT:
# TODO map to something else ?
nameid = provider.normalize_username(user.name)
elif nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_KERBEROS:
nameid = us.get_data('user', 'krb_principal_name')
elif nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_EMAIL:
nameid = us.get_user().email
if not nameid:
nameid = '%s@%s' % (user.name, self.cfg.default_email_domain)
if nameid:
login.assertion.subject.nameId.format = nameidfmt
login.assertion.subject.nameId.content = nameid
else:
raise AuthenticationError("Unavailable Name ID type",
lasso.SAML2_STATUS_CODE_AUTHN_FAILED)
# TODO: add user attributes as policy requires from 'usersession'
def saml2error(self, login, code, message):
status = lasso.Samlp2Status()
status.statusCode = lasso.Samlp2StatusCode()
status.statusCode.value = lasso.SAML2_STATUS_CODE_RESPONDER
status.statusCode.statusCode = lasso.Samlp2StatusCode()
status.statusCode.statusCode.value = code
login.response.status = status
def reply(self, login):
if login.protocolProfile == lasso.LOGIN_PROTOCOL_PROFILE_BRWS_ART:
# TODO
raise cherrypy.HTTPError(501)
elif login.protocolProfile == lasso.LOGIN_PROTOCOL_PROFILE_BRWS_POST:
login.buildAuthnResponseMsg()
self._debug('POSTing back to SP [%s]' % (login.msgUrl))
context = {
"title": 'Redirecting back to the web application',
"action": login.msgUrl,
"fields": [
[lasso.SAML2_FIELD_RESPONSE, login.msgBody],
[lasso.SAML2_FIELD_RELAYSTATE, login.msgRelayState],
],
"submit": 'Return to application',
}
# pylint: disable=star-args
return self._template('saml2/post_response.html', **context)
else:
raise cherrypy.HTTPError(500)
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