Initial SAML2 provider

Signed-off-by: Simo Sorce <simo@redhat.com>

1 files changed, 168 insertions, 0 deletions

diff --git a/ipsilon/providers/saml2/auth.py b/ipsilon/providers/saml2/auth.py
new file mode 100755
index 0000000..e73a692
--- /dev/null
+++ b/ipsilon/providers/saml2/auth.py
@@ -0,0 +1,168 @@
+#!/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
+from ipsilon.util.user import UserSession
+import cherrypy
+import datetime
+import lasso
+
+
+class InvalidRequest(Exception):
+
+    def __init__(self, message):
+        super(InvalidRequest, self).__init__(message)
+        self.message = message
+
+    def __str__(self):
+        return repr(self.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):
+        self.saml2checks(login)
+        self.saml2assertion(login)
+        return self.reply(login)
+
+    def _parse_request(self, message):
+
+        login = lasso.Login(self.cfg.idp)
+
+        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 Service Provider (%r [%r])' % (e, message)
+            # TODO: return to SP anyway ?
+            raise InvalidRequest(msg)
+
+        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 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 cherrypy.HTTPError(401)
+
+        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 Name-ID Policy
+
+        # TODO: check login.request.forceAuthn
+
+        login.validateRequestMsg(not user.is_anonymous, consent)
+
+    def saml2assertion(self, login):
+
+        authtime = datetime.datetime.utcnow()
+        skew = datetime.timedelta(0, 60)
+        authtime_notbefore = authtime - skew
+        authtime_notafter = authtime + skew
+
+        user = UserSession().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))
+        login.assertion.subject.nameId.format = \
+            lasso.SAML2_NAME_IDENTIFIER_FORMAT_PERSISTENT
+        login.assertion.subject.nameId.content = user.name
+
+        # TODO: add user attributes as policy requires taking from 'user'
+
+    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)