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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"
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):
self.username = username
self.password = password
# XXX init something similar to
# SERVER...
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(
SERVER + '/sessions',
data=self.get_auth_data())
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(
SERVER + '/sessions/' + self.username,
data={'client_auth': binascii.hexlify(self.M)})
# 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...
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__":
TEST_USER = "test1"
TEST_PASS = "1234"
@srpauth_protected(user=TEST_USER, passwd=TEST_PASS)
def test_srp_protected_get(*args, **kwargs):
req = requests.get(*args, **kwargs)
print req.content
test_srp_protected_get('http://springbok/1/cert')
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