1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
#!/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.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(Exception):
def __init__(self, message, code):
super(AuthenticationError, self).__init__(message)
self.message = message
self.code = code
def __str__(self):
return repr(self.message)
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
self.nameidfmt = None
def auth(self, login):
try:
self.saml2checks(login)
self.saml2assertion(login)
except AuthenticationError, e:
self.saml2error(login, e.code, e.message)
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 SP [%s] (%r [%r])' % (login.remoteProviderId,
e, message)
raise InvalidRequest(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 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)
nameid = 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)
self.nameidfmt = nameid
# 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
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 self.nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_PERSISTENT:
nameid = user.name ## TODO map to something else ?
elif self.nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_TRANSIENT:
nameid = user.name ## TODO map to something else ?
elif self.nameidfmt == lasso.SAML2_NAME_IDENTIFIER_FORMAT_KERBEROS:
nameid = us.get_data('user', 'krb_principal_name')
elif self.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 = self.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 taking 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)
|
