diff options
Diffstat (limited to 'src/leap/crypto/srpauth.py')
| -rw-r--r-- | src/leap/crypto/srpauth.py | 177 |
1 files changed, 135 insertions, 42 deletions
diff --git a/src/leap/crypto/srpauth.py b/src/leap/crypto/srpauth.py index 89fee80b..8e228e79 100644 --- a/src/leap/crypto/srpauth.py +++ b/src/leap/crypto/srpauth.py @@ -30,8 +30,8 @@ from PySide import QtCore from twisted.internet import threads from leap.common.check import leap_assert -from leap.util.request_helpers import get_content from leap.util.constants import REQUEST_TIMEOUT +from leap.util import request_helpers as reqhelper from leap.common.events import signal as events_signal from leap.common.events import events_pb2 as proto @@ -45,6 +45,71 @@ class SRPAuthenticationError(Exception): pass +class SRPAuthConnectionError(SRPAuthenticationError): + """ + Exception raised when there's a connection error + """ + pass + +class SRPAuthUnknownUser(SRPAuthenticationError): + """ + Exception raised when trying to authenticate an unknown user + """ + pass + +class SRPAuthBadStatusCode(SRPAuthenticationError): + """ + Exception raised when we received an unknown bad status code + """ + pass + +class SRPAuthNoSalt(SRPAuthenticationError): + """ + Exception raised when we don't receive the salt param at a + specific point in the auth process + """ + pass + +class SRPAuthNoB(SRPAuthenticationError): + """ + Exception raised when we don't receive the B param at a specific + point in the auth process + """ + pass + +class SRPAuthBadDataFromServer(SRPAuthenticationError): + """ + Generic exception when we receive bad data from the server. + """ + pass + +class SRPAuthJSONDecodeError(SRPAuthenticationError): + """ + Exception raised when there's a problem decoding the JSON content + parsed as received from th e server. + """ + pass + +class SRPAuthBadPassword(SRPAuthenticationError): + """ + Exception raised when the user provided a bad password to auth. + """ + pass + +class SRPAuthVerificationFailed(SRPAuthenticationError): + """ + Exception raised when we can't verify the SRP data received from + the server. + """ + pass + +class SRPAuthNoSessionId(SRPAuthenticationError): + """ + Exception raised when we don't receive a session id from the + server. + """ + pass + class SRPAuth(QtCore.QObject): """ SRPAuth singleton @@ -126,19 +191,23 @@ class SRPAuth(QtCore.QObject): self._srp_a = A - def _start_authentication(self, _, username, password): + def _start_authentication(self, _, username): """ Sends the first request for authentication to retrieve the salt and B parameter - Might raise SRPAuthenticationError + Might raise all SRPAuthenticationError based: + SRPAuthenticationError + SRPAuthConnectionError + SRPAuthUnknownUser + SRPAuthBadStatusCode + SRPAuthNoSalt + SRPAuthNoB :param _: IGNORED, output from the previous callback (None) :type _: IGNORED :param username: username to login :type username: str - :param password: password for the username - :type password: str :return: salt and B parameters :rtype: tuple @@ -158,24 +227,29 @@ class SRPAuth(QtCore.QObject): verify=self._provider_config. get_ca_cert_path(), timeout=REQUEST_TIMEOUT) + # Clean up A value, we don't need it anymore + self._srp_a = None except requests.exceptions.ConnectionError as e: logger.error("No connection made (salt): %r" % (e,)) - raise SRPAuthenticationError("Could not establish a " + raise SRPAuthConnectionError("Could not establish a " "connection") except Exception as e: logger.error("Unknown error: %r" % (e,)) raise SRPAuthenticationError("Unknown error: %r" % (e,)) - content, mtime = get_content(init_session) + content, mtime = reqhelper.get_content(init_session) if init_session.status_code not in (200,): logger.error("No valid response (salt): " "Status code = %r. Content: %r" % (init_session.status_code, content)) if init_session.status_code == 422: - raise SRPAuthenticationError(self.tr("Unknown user")) + raise SRPAuthUnknownUser(self.tr("Unknown user")) + + raise SRPAuthBadStatusCode(self.tr("There was a problem with" + " authentication")) json_content = json.loads(content) salt = json_content.get("salt", None) @@ -183,12 +257,12 @@ class SRPAuth(QtCore.QObject): if salt is None: logger.error("No salt parameter sent") - raise SRPAuthenticationError(self.tr("The server did not send " - "the salt parameter")) + raise SRPAuthNoSalt(self.tr("The server did not send " + "the salt parameter")) if B is None: logger.error("No B parameter sent") - raise SRPAuthenticationError(self.tr("The server did not send " - "the B parameter")) + raise SRPAuthNoB(self.tr("The server did not send " + "the B parameter")) return salt, B @@ -197,7 +271,12 @@ class SRPAuth(QtCore.QObject): Given the salt and B processes the auth challenge and generates the M2 parameter - Might throw SRPAuthenticationError + Might raise SRPAuthenticationError based: + SRPAuthenticationError + SRPAuthBadDataFromServer + SRPAuthConnectionError + SRPAuthJSONDecodeError + SRPAuthBadPassword :param salt_B: salt and B parameters for the username :type salt_B: tuple @@ -212,10 +291,10 @@ class SRPAuth(QtCore.QObject): salt, B = salt_B unhex_salt = self._safe_unhexlify(salt) unhex_B = self._safe_unhexlify(B) - except TypeError as e: + except (TypeError, ValueError) as e: logger.error("Bad data from server: %r" % (e,)) - raise SRPAuthenticationError(self.tr("The data sent from " - "the server had errors")) + raise SRPAuthBadDataFromServer( + self.tr("The data sent from the server had errors")) M = self._srp_user.process_challenge(unhex_salt, unhex_B) auth_url = "%s/%s/%s/%s" % (self._provider_config.get_api_uri(), @@ -236,13 +315,13 @@ class SRPAuth(QtCore.QObject): timeout=REQUEST_TIMEOUT) except requests.exceptions.ConnectionError as e: logger.error("No connection made (HAMK): %r" % (e,)) - raise SRPAuthenticationError(self.tr("Could not connect to " + raise SRPAuthConnectionError(self.tr("Could not connect to " "the server")) try: - content, mtime = get_content(auth_result) + content, mtime = reqhelper.get_content(auth_result) except JSONDecodeError: - raise SRPAuthenticationError("Bad JSON content in auth result") + raise SRPAuthJSONDecodeError("Bad JSON content in auth result") if auth_result.status_code == 422: error = "" @@ -256,35 +335,47 @@ class SRPAuth(QtCore.QObject): "received: %s", (content,)) logger.error("[%s] Wrong password (HAMK): [%s]" % (auth_result.status_code, error)) - raise SRPAuthenticationError(self.tr("Wrong password")) + raise SRPAuthBadPassword(self.tr("Wrong password")) if auth_result.status_code not in (200,): logger.error("No valid response (HAMK): " "Status code = %s. Content = %r" % (auth_result.status_code, content)) - raise SRPAuthenticationError(self.tr("Unknown error (%s)") % - (auth_result.status_code,)) + raise SRPAuthBadStatusCode(self.tr("Unknown error (%s)") % + (auth_result.status_code,)) - json_content = json.loads(content) + return json.loads(content) + + def _extract_data(self, json_content): + """ + Extracts the necessary parameters from json_content (M2, + id, token) + + Might raise SRPAuthenticationError based: + SRPBadDataFromServer + :param json_content: Data received from the server + :type json_content: dict + """ try: M2 = json_content.get("M2", None) uid = json_content.get("id", None) token = json_content.get("token", None) except Exception as e: logger.error(e) - raise Exception("Something went wrong with the login") - - events_signal(proto.CLIENT_UID, content=uid) + raise SRPAuthBadDataFromServer("Something went wrong with the " + "login") self.set_uid(uid) self.set_token(token) if M2 is None or self.get_uid() is None: logger.error("Something went wrong. Content = %r" % - (content,)) - raise SRPAuthenticationError(self.tr("Problem getting data " - "from server")) + (json_content,)) + raise SRPAuthBadDataFromServer(self.tr("Problem getting data " + "from server")) + + events_signal(proto.CLIENT_UID, content=uid) return M2 @@ -294,7 +385,9 @@ class SRPAuth(QtCore.QObject): verification succeeds, it sets the session_id for this session - Might throw SRPAuthenticationError + Might raise SRPAuthenticationError based: + SRPAuthBadDataFromServer + SRPAuthVerificationFailed :param M2: M2 SRP parameter :type M2: str @@ -304,22 +397,22 @@ class SRPAuth(QtCore.QObject): unhex_M2 = self._safe_unhexlify(M2) except TypeError: logger.error("Bad data from server (HAWK)") - raise SRPAuthenticationError(self.tr("Bad data from server")) + raise SRPAuthBadDataFromServer(self.tr("Bad data from server")) self._srp_user.verify_session(unhex_M2) if not self._srp_user.authenticated(): logger.error("Auth verification failed") - raise SRPAuthenticationError(self.tr("Auth verification " - "failed")) + raise SRPAuthVerificationFailed(self.tr("Auth verification " + "failed")) logger.debug("Session verified.") session_id = self._session.cookies.get(self.SESSION_ID_KEY, None) if not session_id: logger.error("Bad cookie from server (missing _session_id)") - raise SRPAuthenticationError(self.tr("Session cookie " - "verification " - "failed")) + raise SRPAuthNoSessionId(self.tr("Session cookie " + "verification " + "failed")) events_signal(proto.CLIENT_SESSION_ID, content=session_id) @@ -351,12 +444,15 @@ class SRPAuth(QtCore.QObject): d.addCallback( partial(self._threader, self._start_authentication), - username=username, - password=password) + username=username) d.addCallback( partial(self._threader, self._process_challenge), username=username) + d.addCallback( + partial(self._threader, + self._extract_data), + username=username) d.addCallback(partial(self._threader, self._verify_session)) @@ -435,14 +531,11 @@ class SRPAuth(QtCore.QObject): # Store instance reference as the only member in the handle self.__dict__['_SRPAuth__instance'] = SRPAuth.__instance - self._username = None - self._password = None - def authenticate(self, username, password): """ Executes the whole authentication process for a user - Might raise SRPAuthenticationError + Might raise SRPAuthenticationError based :param username: username for this session :type username: str |