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# Copyright (C) 2014 Ipsilon project Contributors, for licensee see COPYING
from ipsilon.providers.common import ProviderPageBase
from ipsilon.util.trans import Transaction
from ipsilon.util.user import UserSession
import base64
import cherrypy
import time
import json
import M2Crypto
class AuthenticateRequest(ProviderPageBase):
def __init__(self, *args, **kwargs):
super(AuthenticateRequest, self).__init__(*args, **kwargs)
self.trans = None
def _preop(self, *args, **kwargs):
try:
# generate a new id or get current one
self.trans = Transaction('persona', **kwargs)
if self.trans.cookie.value != self.trans.provider:
self.debug('Invalid transaction, %s != %s' % (
self.trans.cookie.value, self.trans.provider))
except Exception, e: # pylint: disable=broad-except
self.debug('Transaction initialization failed: %s' % repr(e))
raise cherrypy.HTTPError(400, 'Invalid transaction id')
def pre_GET(self, *args, **kwargs):
self._preop(*args, **kwargs)
def pre_POST(self, *args, **kwargs):
self._preop(*args, **kwargs)
class Sign(AuthenticateRequest):
def _base64_url_decode(self, inp):
inp += '=' * (4 - (len(inp) % 4))
return base64.urlsafe_b64decode(inp)
def _base64_url_encode(self, inp):
return base64.urlsafe_b64encode(inp).replace('=', '')
def _persona_sign(self, email, publicKey, certDuration):
self.debug('Signing for %s with duration of %s' % (email,
certDuration))
header = {'alg': 'RS256'}
header = json.dumps(header)
header = self._base64_url_encode(header)
claim = {}
# Valid from 10 seconds before now to account for clock skew
claim['iat'] = 1000 * int(time.time() - 10)
# Validity of at most 24 hours
claim['exp'] = 1000 * int(time.time() +
min(certDuration, 24 * 60 * 60))
claim['iss'] = self.cfg.issuer_domain
claim['public-key'] = json.loads(publicKey)
claim['principal'] = {'email': email}
claim = json.dumps(claim)
claim = self._base64_url_encode(claim)
certificate = '%s.%s' % (header, claim)
digest = M2Crypto.EVP.MessageDigest('sha256')
digest.update(certificate)
signature = self.cfg.key.sign(digest.digest(), 'sha256')
signature = self._base64_url_encode(signature)
signed_certificate = '%s.%s' % (certificate, signature)
return signed_certificate
def _willing_to_sign(self, email, username):
for domain in self.cfg.allowed_domains:
if email == ('%s@%s' % (username, domain)):
return True
return False
def POST(self, *args, **kwargs):
if 'email' not in kwargs or 'publicKey' not in kwargs \
or 'certDuration' not in kwargs or '@' not in kwargs['email']:
cherrypy.response.status = 400
raise Exception('Invalid request: %s' % kwargs)
us = UserSession()
user = us.get_user()
if user.is_anonymous:
raise cherrypy.HTTPError(401, 'Not signed in')
if not self._willing_to_sign(kwargs['email'], user.name):
self.log('Not willing to sign for %s, logged in as %s' % (
kwargs['email'], user.name))
raise cherrypy.HTTPError(403, 'Incorrect user')
return self._persona_sign(kwargs['email'], kwargs['publicKey'],
kwargs['certDuration'])
class SignInResult(AuthenticateRequest):
def GET(self, *args, **kwargs):
user = UserSession().get_user()
return self._template('persona/signin_result.html',
loggedin=not user.is_anonymous)
class SignIn(AuthenticateRequest):
def __init__(self, *args, **kwargs):
super(SignIn, self).__init__(*args, **kwargs)
self.result = SignInResult(*args, **kwargs)
self.trans = None
def GET(self, *args, **kwargs):
username = None
domain = None
if 'email' in kwargs:
if '@' in kwargs['email']:
username, domain = kwargs['email'].split('@', 2)
self.debug('Persona SignIn requested for: %s@%s' % (username,
domain))
returl = '%s/persona/SignIn/result?%s' % (
self.basepath, self.trans.get_GET_arg())
data = {'login_return': returl,
'login_target': 'Persona',
'login_username': username}
self.trans.store(data)
redirect = '%s/login?%s' % (self.basepath,
self.trans.get_GET_arg())
self.debug('Redirecting: %s' % redirect)
raise cherrypy.HTTPRedirect(redirect)
class Persona(AuthenticateRequest):
def __init__(self, *args, **kwargs):
super(Persona, self).__init__(*args, **kwargs)
self.Sign = Sign(*args, **kwargs)
self.SignIn = SignIn(*args, **kwargs)
self.trans = None
def GET(self, *args, **kwargs):
user = UserSession().get_user()
return self._template('persona/provisioning.html',
loggedin=not user.is_anonymous)
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