diff options
Diffstat (limited to 'service/app/bitmask_libraries/leap_srp.py')
-rw-r--r-- | service/app/bitmask_libraries/leap_srp.py | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/service/app/bitmask_libraries/leap_srp.py b/service/app/bitmask_libraries/leap_srp.py new file mode 100644 index 00000000..a1de7de3 --- /dev/null +++ b/service/app/bitmask_libraries/leap_srp.py @@ -0,0 +1,105 @@ +import binascii +import json + +from requests import Session +from srp import User, srp +from requests.exceptions import HTTPError, SSLError, Timeout +from config import SYSTEM_CA_BUNDLE + + +class LeapAuthException(Exception): + def __init__(self, *args, **kwargs): + super(LeapAuthException, self).__init__(*args, **kwargs) + + +class LeapSRPSession(object): + def __init__(self, user_name, api_server_name, uuid, token, session_id, api_version='1'): + self.user_name = user_name + self.api_server_name = api_server_name + self.uuid = uuid + self.token = token + self.session_id = session_id + self.api_version = api_version + + def __str__(self): + return 'LeapSRPSession(%s, %s, %s, %s, %s, %s)' % (self.user_name, self.api_server_name, self.uuid, self.token, self.session_id, self.api_version) + + +class LeapSecureRemotePassword(object): + def __init__(self, hash_alg=srp.SHA256, ng_type=srp.NG_1024, ca_bundle=SYSTEM_CA_BUNDLE, timeout_in_s=15, + leap_api_version='1'): + + self.hash_alg = hash_alg + self.ng_type = ng_type + self.timeout_in_s = timeout_in_s + self.ca_bundle = ca_bundle + self.leap_api_version = leap_api_version + + def authenticate(self, api_uri, username, password): + session = Session() + try: + return self._authenticate_with_session(session, api_uri, username, password) + except Timeout, e: + raise LeapAuthException(e) + finally: + session.close() + + def _authenticate_with_session(self, http_session, api_uri, username, password): + try: + srp_user = User(username.encode('utf-8'), password.encode('utf-8'), self.hash_alg, self.ng_type) + + salt, B_challenge = self._begin_authentication(srp_user, http_session, api_uri) + M2_verfication_code, leap_session = self._process_challenge(srp_user, http_session, api_uri, salt, + B_challenge) + self._verify_session(srp_user, M2_verfication_code) + + return leap_session + except (HTTPError, SSLError), e: + raise LeapAuthException(e) + + def _begin_authentication(self, user, session, api_uri): + _, A = user.start_authentication() + + auth_data = { + "login": user.get_username(), + "A": binascii.hexlify(A) + } + session_url = '%s/%s/sessions' % (api_uri, self.leap_api_version) + response = session.post(session_url, data=auth_data, verify=self.ca_bundle, timeout=self.timeout_in_s) + response.raise_for_status() + json_content = json.loads(response.content) + + salt = _safe_unhexlify(json_content.get('salt')) + B = _safe_unhexlify(json_content.get('B')) + + return salt, B + + def _process_challenge(self, user, session, api_uri, salt, B): + M = user.process_challenge(salt, B) + + auth_data = { + "client_auth": binascii.hexlify(M) + } + + auth_url = '%s/%s/sessions/%s' % (api_uri, self.leap_api_version, user.get_username()) + response = session.put(auth_url, data=auth_data, verify=self.ca_bundle, timeout=self.timeout_in_s) + response.raise_for_status() + auth_json = json.loads(response.content) + + M2 = _safe_unhexlify(auth_json.get('M2')) + uuid = auth_json.get('id') + token = auth_json.get('token') + session_id = response.cookies.get('_session_id') + + return M2, LeapSRPSession(user.get_username(), api_uri, uuid, token, session_id) + + def _verify_session(self, user, M2): + user.verify_session(M2) + if not user.authenticated(): + raise LeapAuthException() + + +def _safe_unhexlify(hex_str): + return binascii.unhexlify(hex_str) \ + if (len(hex_str) % 2 == 0) else binascii.unhexlify('0' + hex_str) + |