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|
import binascii
import json
import logging
import urlparse
import requests
import srp
from PyQt4 import QtCore
from leap.base import constants as baseconstants
logger = logging.getLogger(__name__)
SIGNUP_TIMEOUT = getattr(baseconstants, 'SIGNUP_TIMEOUT', 5)
# XXX remove me!!
SERVER = "http://springbok/1"
"""
Registration and authentication classes for the
SRP auth mechanism used in the leap platform.
We're currently using the (pure python?) srp library since
it seemed the fastest way of getting something working.
In the future we can switch to use python-gnutls, since
libgnutls implements srp protocol.
"""
class LeapSRPRegister(object):
def __init__(self,
schema="https",
provider=None,
port=None,
register_path="1/users.json",
method="POST",
fetcher=requests,
srp=srp,
hashfun=srp.SHA256,
ng_constant=srp.NG_1024):
self.schema = schema
self.provider = provider
self.port = port
self.register_path = register_path
self.method = method
self.fetcher = fetcher
self.srp = srp
self.HASHFUN = hashfun
self.NG = ng_constant
self.init_session()
def init_session(self):
self.session = self.fetcher.session()
def get_registration_uri(self):
# XXX assert is https!
# use urlparse
if self.port:
uri = "%s://%s:%s/%s" % (
self.schema,
self.provider,
self.port,
self.register_path)
else:
uri = "%s://%s/%s" % (
self.schema,
self.provider,
self.register_path)
return uri
def register_user(self, username, password, keep=False):
"""
@rtype: tuple
@rparam: (ok, request)
"""
salt, vkey = self.srp.create_salted_verification_key(
username,
password,
self.HASHFUN,
self.NG)
user_data = {
'user[login]': username,
'user[password_verifier]': binascii.hexlify(vkey),
'user[password_salt]': binascii.hexlify(salt)}
uri = self.get_registration_uri()
logger.debug('post to uri: %s' % uri)
# XXX get self.method
req = self.session.post(
uri, data=user_data,
timeout=SIGNUP_TIMEOUT)
logger.debug(req)
logger.debug('user_data: %s', user_data)
#logger.debug('response: %s', req.text)
# we catch it in the form
#req.raise_for_status()
return (req.ok, req)
class SRPAuthenticationError(Exception):
"""
exception raised
for authentication errors
"""
pass
safe_unhexlify = lambda x: binascii.unhexlify(x) \
if (len(x) % 2 == 0) else binascii.unhexlify('0' + x)
class SRPAuth(requests.auth.AuthBase):
def __init__(self, username, password, server=SERVER, verify=True):
self.username = username
self.password = password
self.server = server
self.verify = verify
self.init_data = None
self.session = requests.session()
self.init_srp()
def get_data(self, response):
return json.loads(response.content)
def init_srp(self):
usr = srp.User(
self.username,
self.password,
srp.SHA256,
srp.NG_1024)
uname, A = usr.start_authentication()
self.srp_usr = usr
self.A = A
def get_auth_data(self):
return {
'login': self.username,
'A': binascii.hexlify(self.A)
}
def get_init_data(self):
init_session = self.session.post(
self.server + '/sessions',
data=self.get_auth_data(),
verify=self.verify)
self.init_data = self.get_data(init_session)
return self.init_data
def authenticate(self):
print 'start authentication...'
init_data = self.get_init_data()
salt = init_data.get('salt', None)
B = init_data.get('B', None)
if not salt or not B:
raise SRPAuthenticationError
self.M = self.srp_usr.process_challenge(
safe_unhexlify(salt),
safe_unhexlify(B)
)
auth_result = self.session.put(
self.server + '/sessions/' + self.username,
data={'client_auth': binascii.hexlify(self.M)},
verify=self.verify)
# XXX check for errors
auth_data = self.get_data(auth_result)
self.srp_usr.verify_session(
safe_unhexlify(auth_data["M2"]))
try:
assert self.srp_usr.authenticated()
print 'user is authenticated!'
except (AssertionError):
raise SRPAuthenticationError
def __call__(self, req):
self.authenticate()
req.session = self.session
return req
def srpauth_protected(user=None, passwd=None):
"""
decorator factory that accepts
user and password keyword arguments
and add those to the decorated request
"""
def srpauth(fn, user=user, passwd=passwd):
def wrapper(*args, **kwargs):
print 'uri is ', args[0]
if user and passwd:
auth = SRPAuth(user, passwd)
kwargs['auth'] = auth
return fn(*args, **kwargs)
return wrapper
return srpauth
def magic_srpauth(fn):
"""
decorator that gets user and password
from the config file and adds those to
the decorated request
"""
# TODO --- finish this...
# currently broken.
def wrapper(*args, **kwargs):
uri = args[0]
# XXX Ugh!
# Problem with this approach.
# This won't work when we're using
# api.foo.bar
# Unless we keep a table with the
# equivalencies...
domain = urlparse.urlparse(uri).netloc
# XXX check this settings init...
settings = QtCore.QSettings()
user = settings.get('%s_username' % domain, None)
# uh... I forgot.
# get secret?
# leapkeyring.get_password(foo?)
passwd = settings.get('%s_password' % domain, None)
auth = SRPAuth(user, passwd)
kwargs['auth'] = auth
return fn(*args, **kwargs)
return wrapper
if __name__ == "__main__":
import sys
user = sys.argv[1]
passwd = sys.argv[2]
@srpauth_protected(user=user, passwd=passwd)
def test_srp_protected_get(*args, **kwargs):
req = requests.get(*args, **kwargs)
req.raise_for_status
#print req.content
test_srp_protected_get('http://springbok/1/cert')
|
