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# -*- coding: utf-8 -*-
# session.py
# Copyright (C) 2015 LEAP
#
# 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/>.
"""
LEAP Session management.
"""
from twisted.internet import defer, reactor
from twisted.logger import Logger
from . import _srp
from . import provider
from ._http import httpRequest, cookieAgentFactory
OK = 'ok'
def _auth_required(func):
"""
Decorate a method so that it will not be called if the instance
attribute `is_authenticated` does not evaluate to True.
"""
def decorated(*args, **kwargs):
instance = args[0]
allowed = getattr(instance, 'is_authenticated')
if not allowed:
raise RuntimeError('This method requires authentication')
return func(*args, **kwargs)
return decorated
class Session(object):
log = Logger()
def __init__(self, credentials, api, provider_cert):
# TODO check if an anonymous credentials is passed.
# TODO move provider_cert to api object.
# On creation, it should be able to retrieve all the info it needs
# (calling bootstrap).
# TODO could get a "provider" object instead.
# this provider can have an api attribute,
# and a "autoconfig" attribute passed on initialization.
# TODO get a file-descriptor for password if not in credentials
# TODO merge self._request with config.Provider._http_request ?
self.username = credentials.username
self.password = credentials.password
self._provider_cert = provider_cert
self._api = api
self._initialize_session()
def _initialize_session(self):
self._agent = cookieAgentFactory(self._provider_cert)
username = self.username or ''
password = self.password or ''
self._srp_auth = _srp.SRPAuthMechanism(username, password)
self._srp_signup = _srp.SRPSignupMechanism()
self._srp_password = _srp.SRPPasswordChangeMechanism()
self._srp_recovery_code = _srp.SRPRecoveryCodeUpdateMechanism()
self._token = None
self._uuid = None
# Session
@property
def token(self):
return self._token
@property
def uuid(self):
return self._uuid
@property
def is_authenticated(self):
return self._srp_auth.srp_user.authenticated()
@defer.inlineCallbacks
def authenticate(self):
uri = self._api.get_handshake_uri()
met = self._api.get_handshake_method()
self.log.debug('%s to %s' % (met, uri))
params = self._srp_auth.get_handshake_params()
handshake = yield self._request(self._agent, uri, values=params,
method=met)
self._srp_auth.process_handshake(handshake)
uri = self._api.get_authenticate_uri(login=self.username)
met = self._api.get_authenticate_method()
self.log.debug('%s to %s' % (met, uri))
params = self._srp_auth.get_authentication_params()
auth = yield self._request(self._agent, uri, values=params,
method=met)
uuid, token = self._srp_auth.process_authentication(auth)
self._srp_auth.verify_authentication()
self._uuid = uuid
self._token = token
defer.returnValue(OK)
@_auth_required
@defer.inlineCallbacks
def logout(self):
uri = self._api.get_logout_uri()
met = self._api.get_logout_method()
yield self._request(self._agent, uri, method=met)
self.username = None
self.password = None
self._initialize_session()
defer.returnValue(OK)
@_auth_required
@defer.inlineCallbacks
def change_password(self, password):
uri = self._api.get_update_user_uri(uid=self._uuid)
met = self._api.get_update_user_method()
params = self._srp_password.get_password_params(
self.username, password)
yield self._request(self._agent, uri, values=params, method=met)
self.password = password
self._srp_auth = _srp.SRPAuthMechanism(self.username, password)
defer.returnValue(OK)
@_auth_required
@defer.inlineCallbacks
def update_recovery_code(self, recovery_code):
uri = self._api.get_update_user_uri(uid=self._uuid)
met = self._api.get_update_user_method()
params = self._srp_recovery_code.get_recovery_code_params(
self.username, recovery_code)
update = yield self._request(self._agent, uri, values=params,
method=met)
defer.returnValue(update)
# User certificates
def get_vpn_cert(self):
# TODO pass it to the provider object so that it can save it in the
# right path.
uri = self._api.get_vpn_cert_uri()
met = self._api.get_vpn_cert_method()
return self._request(self._agent, uri, method=met)
@_auth_required
def get_smtp_cert(self):
# TODO pass it to the provider object so that it can save it in the
# right path.
uri = self._api.get_smtp_cert_uri()
met = self._api.get_smtp_cert_method()
print met, "to", uri
return self._request(self._agent, uri, method=met)
def _request(self, *args, **kw):
# TODO: we are not pinning the TLS cert of the API
# maybe we can use leap.common.http
kw['token'] = self._token
return httpRequest(*args, **kw)
# User management
@defer.inlineCallbacks
def signup(self, username, password, invite=None):
# XXX should check that it_IS_NOT_authenticated
provider.validate_username(username)
uri = self._api.get_signup_uri()
met = self._api.get_signup_method()
params = self._srp_signup.get_signup_params(
username, password, invite)
signup = yield self._request(self._agent, uri, values=params,
method=met)
registered_user = self._srp_signup.process_signup(signup)
self.username = username
self.password = password
defer.returnValue((OK, registered_user))
@_auth_required
def update_user_record(self):
# FIXME to be implemented
pass
# Authentication-protected configuration
@defer.inlineCallbacks
def fetch_provider_configs(self, uri, path):
config = yield self._request(self._agent, uri)
with open(path, 'w') as cf:
cf.write(config)
defer.returnValue('ok')
if __name__ == "__main__":
import os
import sys
from twisted.cred.credentials import UsernamePassword
log = Logger()
if len(sys.argv) != 4:
print "Usage:", sys.argv[0], "provider", "username", "password"
sys.exit()
_provider, username, password = sys.argv[1], sys.argv[2], sys.argv[3]
api = provider.Api('https://api.%s:4430' % _provider)
credentials = UsernamePassword(username, password)
cdev_pem = os.path.expanduser(
'~/.config/leap/providers/%s/keys/ca/cacert.pem' % _provider)
session = Session(credentials, api, cdev_pem)
def print_result(result):
print result
return result
def cbShutDown(ignored):
reactor.stop()
def auth_eb(failure):
log.error(failure)
d = session.authenticate()
d.addCallback(print_result)
d.addErrback(auth_eb)
d.addCallback(lambda _: session.get_smtp_cert())
# d.addCallback(lambda _: session.get_vpn_cert())
d.addCallback(print_result)
d.addErrback(auth_eb)
d.addCallback(lambda _: session.logout())
d.addErrback(auth_eb)
d.addBoth(cbShutDown)
reactor.run()
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