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authorTomás Touceda <chiiph@leap.se>2013-08-21 14:50:28 -0300
committerTomás Touceda <chiiph@leap.se>2013-08-21 14:50:28 -0300
commit0de5ddd4aa0bb2eef41572d61304719939f4f459 (patch)
tree5ca9d38c3a77a57e7903c8c7da9c03892917ce26 /server
parentcb9453ea3abc35adb3707f2c9877777cc7a27893 (diff)
parent50e5a604096365509b5d1a1fe810f4ec019eb0ee (diff)
Merge remote-tracking branch 'drebs/feature/3487_split-soledad-into-common-client-and-server-3' into develop
Diffstat (limited to 'server')
-rw-r--r--server/changes/feature_3487-split-soledad-into-common-client-and-server1
-rw-r--r--server/pkg/soledad68
-rw-r--r--server/setup.py81
-rw-r--r--server/src/leap/__init__.py6
-rw-r--r--server/src/leap/soledad/__init__.py6
-rw-r--r--server/src/leap/soledad/server/__init__.py125
-rw-r--r--server/src/leap/soledad/server/auth.py431
7 files changed, 718 insertions, 0 deletions
diff --git a/server/changes/feature_3487-split-soledad-into-common-client-and-server b/server/changes/feature_3487-split-soledad-into-common-client-and-server
new file mode 100644
index 00000000..2eab6b56
--- /dev/null
+++ b/server/changes/feature_3487-split-soledad-into-common-client-and-server
@@ -0,0 +1 @@
+ o Split soledad package into common, client and server. Closes #3487.
diff --git a/server/pkg/soledad b/server/pkg/soledad
new file mode 100644
index 00000000..c233731e
--- /dev/null
+++ b/server/pkg/soledad
@@ -0,0 +1,68 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides: soledad
+# Required-Start: $network $named $remote_fs $syslog $time
+# Required-Stop: $network $named $remote_fs $syslog
+# Default-Start: 2 3 4 5
+# Default-Stop: 0 1 6
+# Short-Description: Start soledad daemon at boot time
+# Description: Synchronization of locally encrypted data among devices
+### END INIT INFO
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+PIDFILE=/var/run/soledad.pid
+RUNDIR=/var/lib/soledad/
+OBJ=leap.soledad_server.application
+LOGFILE=/var/log/soledad.log
+HTTPS_PORT=2424
+CERT_PATH=/etc/leap/soledad-server.pem
+PRIVKEY_PATH=/etc/leap/soledad-server.key
+TWISTD_PATH=/usr/bin/twistd
+HOME=/var/lib/soledad/
+
+[ -r /etc/default/soledad ] && . /etc/default/soledad
+
+test -r /etc/leap/ || exit 0
+
+. /lib/lsb/init-functions
+
+
+case "$1" in
+ start)
+ echo -n "Starting soledad: twistd"
+ start-stop-daemon --start --quiet --exec $TWISTD_PATH -- \
+ --pidfile=$PIDFILE \
+ --logfile=$LOGFILE \
+ web \
+ --wsgi=$OBJ \
+ --port=ssl:$HTTPS_PORT:privateKey=$PRIVKEY_PATH:certKey=$CERT_PATH
+ echo "."
+ ;;
+
+ stop)
+ echo -n "Stopping soledad: twistd"
+ start-stop-daemon --stop --quiet \
+ --pidfile $PIDFILE
+ echo "."
+ ;;
+
+ restart)
+ $0 stop
+ $0 start
+ ;;
+
+ force-reload)
+ $0 restart
+ ;;
+
+ status)
+ status_of_proc -p $PIDFILE $TWISTD_PATH soledad && exit 0 || exit $?
+ ;;
+
+ *)
+ echo "Usage: /etc/init.d/soledad {start|stop|restart|force-reload|status}" >&2
+ exit 1
+ ;;
+esac
+
+exit 0
diff --git a/server/setup.py b/server/setup.py
new file mode 100644
index 00000000..89354a57
--- /dev/null
+++ b/server/setup.py
@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+# setup.py
+# Copyright (C) 2013 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/>.
+
+
+import os
+from setuptools import (
+ setup,
+ find_packages
+)
+
+
+install_requirements = [
+ 'configparser',
+ 'couchdb',
+ 'simplejson',
+ 'twisted>=12.0.0', # TODO: maybe we just want twisted-web?
+ 'oauth', # this is not strictly needed by us, but we need it
+ # until u1db adds it to its release as a dep.
+ 'u1db',
+ 'routes',
+ 'PyOpenSSL',
+ 'leap.soledad.common>=0.3.0',
+]
+
+
+if os.environ.get('VIRTUAL_ENV', None):
+ data_files = None
+else:
+ # XXX this should go only for linux/mac
+ data_files = [("/etc/init.d/", ["pkg/soledad"])]
+
+
+trove_classifiers = (
+ "Development Status :: 3 - Alpha",
+ "Intended Audience :: Developers",
+ "License :: OSI Approved :: "
+ "GNU General Public License v3 or later (GPLv3+)",
+ "Environment :: Console",
+ "Operating System :: OS Independent",
+ "Operating System :: POSIX",
+ "Programming Language :: Python :: 2.6",
+ "Programming Language :: Python :: 2.7",
+ "Topic :: Database :: Front-Ends",
+ "Topic :: Software Development :: Libraries :: Python Modules"
+)
+
+
+setup(
+ name='leap.soledad.server',
+ version='0.3.0',
+ url='https://leap.se/',
+ license='GPLv3+',
+ description='Synchronization of locally encrypted data among devices.',
+ author='The LEAP Encryption Access Project',
+ author_email='info@leap.se',
+ long_description=(
+ "Soledad is the part of LEAP that allows application data to be "
+ "securely shared among devices. It provides, to other parts of the "
+ "LEAP client, an API for data storage and sync."
+ ),
+ namespace_packages=["leap", "leap.soledad"],
+ packages=find_packages('src'),
+ package_dir={'': 'src'},
+ install_requires=install_requirements,
+ data_files=data_files,
+ classifiers=trove_classifiers,
+)
diff --git a/server/src/leap/__init__.py b/server/src/leap/__init__.py
new file mode 100644
index 00000000..f48ad105
--- /dev/null
+++ b/server/src/leap/__init__.py
@@ -0,0 +1,6 @@
+# See http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
+try:
+ __import__('pkg_resources').declare_namespace(__name__)
+except ImportError:
+ from pkgutil import extend_path
+ __path__ = extend_path(__path__, __name__)
diff --git a/server/src/leap/soledad/__init__.py b/server/src/leap/soledad/__init__.py
new file mode 100644
index 00000000..f48ad105
--- /dev/null
+++ b/server/src/leap/soledad/__init__.py
@@ -0,0 +1,6 @@
+# See http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
+try:
+ __import__('pkg_resources').declare_namespace(__name__)
+except ImportError:
+ from pkgutil import extend_path
+ __path__ = extend_path(__path__, __name__)
diff --git a/server/src/leap/soledad/server/__init__.py b/server/src/leap/soledad/server/__init__.py
new file mode 100644
index 00000000..4ed8efc9
--- /dev/null
+++ b/server/src/leap/soledad/server/__init__.py
@@ -0,0 +1,125 @@
+# -*- coding: utf-8 -*-
+# server.py
+# Copyright (C) 2013 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/>.
+
+
+"""
+A U1DB server that stores data using CouchDB as its persistence layer.
+
+This should be run with:
+ twistd -n web --wsgi=leap.soledad_server.application --port=2424
+"""
+
+import configparser
+
+from u1db.remote import http_app
+
+
+# Keep OpenSSL's tsafe before importing Twisted submodules so we can put
+# it back if Twisted==12.0.0 messes with it.
+from OpenSSL import tsafe
+old_tsafe = tsafe
+
+from twisted.web.wsgi import WSGIResource
+from twisted.internet import reactor
+from twisted import version
+if version.base() == "12.0.0":
+ # Put OpenSSL's tsafe back into place. This can probably be removed if we
+ # come to use Twisted>=12.3.0.
+ import sys
+ sys.modules['OpenSSL.tsafe'] = old_tsafe
+
+
+from leap.soledad.server.auth import SoledadTokenAuthMiddleware
+from leap.soledad.common.couch import CouchServerState
+
+
+#-----------------------------------------------------------------------------
+# Soledad WSGI application
+#-----------------------------------------------------------------------------
+
+class SoledadApp(http_app.HTTPApp):
+ """
+ Soledad WSGI application
+ """
+
+ SHARED_DB_NAME = 'shared'
+ """
+ The name of the shared database that holds user's encrypted secrets.
+ """
+
+ USER_DB_PREFIX = 'user-'
+ """
+ The string prefix of users' databases.
+ """
+
+ def __call__(self, environ, start_response):
+ """
+ Handle a WSGI call to the Soledad application.
+
+ @param environ: Dictionary containing CGI variables.
+ @type environ: dict
+ @param start_response: Callable of the form start_response(status,
+ response_headers, exc_info=None).
+ @type start_response: callable
+
+ @return: HTTP application results.
+ @rtype: list
+ """
+ # ensure the shared database exists
+ self.state.ensure_database(self.SHARED_DB_NAME)
+ return http_app.HTTPApp.__call__(self, environ, start_response)
+
+
+#-----------------------------------------------------------------------------
+# Auxiliary functions
+#-----------------------------------------------------------------------------
+
+def load_configuration(file_path):
+ """
+ Load server configuration from file.
+
+ @param file_path: The path to the configuration file.
+ @type file_path: str
+
+ @return: A dictionary with the configuration.
+ @rtype: dict
+ """
+ conf = {
+ 'couch_url': 'http://localhost:5984',
+ }
+ config = configparser.ConfigParser()
+ config.read(file_path)
+ if 'soledad-server' in config:
+ for key in conf:
+ if key in config['soledad-server']:
+ conf[key] = config['soledad-server'][key]
+ # TODO: implement basic parsing/sanitization of options comming from
+ # config file.
+ return conf
+
+
+#-----------------------------------------------------------------------------
+# Run as Twisted WSGI Resource
+#-----------------------------------------------------------------------------
+
+conf = load_configuration('/etc/leap/soledad-server.conf')
+state = CouchServerState(conf['couch_url'])
+
+# WSGI application that may be used by `twistd -web`
+application = SoledadTokenAuthMiddleware(SoledadApp(state))
+
+resource = WSGIResource(reactor, reactor.getThreadPool(), application)
diff --git a/server/src/leap/soledad/server/auth.py b/server/src/leap/soledad/server/auth.py
new file mode 100644
index 00000000..3bcfcf04
--- /dev/null
+++ b/server/src/leap/soledad/server/auth.py
@@ -0,0 +1,431 @@
+# -*- coding: utf-8 -*-
+# auth.py
+# Copyright (C) 2013 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/>.
+
+
+"""
+Authentication facilities for Soledad Server.
+"""
+
+
+import httplib
+import simplejson as json
+
+
+from u1db import DBNAME_CONSTRAINTS
+from abc import ABCMeta, abstractmethod
+from routes.mapper import Mapper
+from couchdb.client import Server
+from twisted.python import log
+
+
+#-----------------------------------------------------------------------------
+# Authentication
+#-----------------------------------------------------------------------------
+
+class Unauthorized(Exception):
+ """
+ User authentication failed.
+ """
+
+
+class URLToAuthorization(object):
+ """
+ Verify if actions can be performed by a user.
+ """
+
+ HTTP_METHOD_GET = 'GET'
+ HTTP_METHOD_PUT = 'PUT'
+ HTTP_METHOD_DELETE = 'DELETE'
+ HTTP_METHOD_POST = 'POST'
+
+ def __init__(self, uuid, shared_db_name, user_db_prefix):
+ """
+ Initialize the mapper.
+
+ The C{uuid} is used to create the rules that will either allow or
+ disallow the user to perform specific actions.
+
+ @param uuid: The user uuid.
+ @type uuid: str
+ @param shared_db_name: The name of the shared database that holds
+ user's encrypted secrets.
+ @type shared_db_name: str
+ @param user_db_prefix: The string prefix of users' databases.
+ @type user_db_prefix: str
+ """
+ self._map = Mapper(controller_scan=None)
+ self._user_db_prefix = user_db_prefix
+ self._shared_db_name = shared_db_name
+ self._register_auth_info(self._uuid_dbname(uuid))
+
+ def is_authorized(self, environ):
+ """
+ Return whether an HTTP request that produced the CGI C{environ}
+ corresponds to an authorized action.
+
+ @param environ: Dictionary containing CGI variables.
+ @type environ: dict
+
+ @return: Whether the action is authorized or not.
+ @rtype: bool
+ """
+ return self._map.match(environ=environ) is not None
+
+ def _register(self, pattern, http_methods):
+ """
+ Register a C{pattern} in the mapper as valid for C{http_methods}.
+
+ @param pattern: The URL pattern that corresponds to the user action.
+ @type pattern: str
+ @param http_methods: A list of authorized HTTP methods.
+ @type http_methods: list of str
+ """
+ self._map.connect(
+ None, pattern, http_methods=http_methods,
+ conditions=dict(method=http_methods),
+ requirements={'dbname': DBNAME_CONSTRAINTS})
+
+ def _uuid_dbname(self, uuid):
+ """
+ Return the database name corresponding to C{uuid}.
+
+ @param uuid: The user uid.
+ @type uuid: str
+
+ @return: The database name corresponding to C{uuid}.
+ @rtype: str
+ """
+ return '%s%s' % (self._user_db_prefix, uuid)
+
+ def _register_auth_info(self, dbname):
+ """
+ Register the authorization info in the mapper using C{dbname} as the
+ user's database name.
+
+ This method sets up the following authorization rules:
+
+ URL path | Authorized actions
+ --------------------------------------------------
+ / | GET
+ /shared-db | GET
+ /shared-db/docs | -
+ /shared-db/doc/{id} | GET, PUT, DELETE
+ /shared-db/sync-from/{source} | -
+ /user-db | GET, PUT, DELETE
+ /user-db/docs | -
+ /user-db/doc/{id} | -
+ /user-db/sync-from/{source} | GET, PUT, POST
+
+ @param dbname: The name of the user's database.
+ @type dbname: str
+ """
+ # auth info for global resource
+ self._register('/', [self.HTTP_METHOD_GET])
+ # auth info for shared-db database resource
+ self._register(
+ '/%s' % self._shared_db_name,
+ [self.HTTP_METHOD_GET])
+ # auth info for shared-db doc resource
+ self._register(
+ '/%s/doc/{id:.*}' % self._shared_db_name,
+ [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT,
+ self.HTTP_METHOD_DELETE])
+ # auth info for user-db database resource
+ self._register(
+ '/%s' % dbname,
+ [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT,
+ self.HTTP_METHOD_DELETE])
+ # auth info for user-db sync resource
+ self._register(
+ '/%s/sync-from/{source_replica_uid}' % dbname,
+ [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT,
+ self.HTTP_METHOD_POST])
+ # generate the regular expressions
+ self._map.create_regs()
+
+
+class SoledadAuthMiddleware(object):
+ """
+ Soledad Authentication WSGI middleware.
+
+ This class must be extended to implement specific authentication methods
+ (see SoledadTokenAuthMiddleware below).
+
+ It expects an HTTP_AUTHORIZATION header containing the the concatenation of
+ the following strings:
+
+ 1. The authentication scheme. It will be verified by the
+ _verify_authentication_scheme() method.
+
+ 2. A space character.
+
+ 3. The base64 encoded string of the concatenation of the user uuid with
+ the authentication data, separated by a collon, like this:
+
+ base64("<uuid>:<auth_data>")
+
+ After authentication check, the class performs an authorization check to
+ verify whether the user is authorized to perform the requested action.
+
+ On client-side, 2 methods must be implemented so the soledad client knows
+ how to send authentication headers to server:
+
+ * set_<method>_credentials: store authentication credentials in the
+ class.
+
+ * _sign_request: format and include custom authentication data in
+ the HTTP_AUTHORIZATION header.
+
+ See leap.soledad.auth and u1db.remote.http_client.HTTPClient to understand
+ how to do it.
+ """
+
+ __metaclass__ = ABCMeta
+
+ HTTP_AUTH_KEY = "HTTP_AUTHORIZATION"
+ PATH_INFO_KEY = "PATH_INFO"
+
+ CONTENT_TYPE_JSON = ('content-type', 'application/json')
+
+ def __init__(self, app):
+ """
+ Initialize the Soledad Authentication Middleware.
+
+ @param app: The application to run on successfull authentication.
+ @type app: u1db.remote.http_app.HTTPApp
+ @param prefix: Auth app path prefix.
+ @type prefix: str
+ """
+ self._app = app
+
+ def _error(self, start_response, status, description, message=None):
+ """
+ Send a JSON serialized error to WSGI client.
+
+ @param start_response: Callable of the form start_response(status,
+ response_headers, exc_info=None).
+ @type start_response: callable
+ @param status: Status string of the form "999 Message here"
+ @type status: str
+ @param response_headers: A list of (header_name, header_value) tuples
+ describing the HTTP response header.
+ @type response_headers: list
+ @param description: The error description.
+ @type description: str
+ @param message: The error message.
+ @type message: str
+
+ @return: List with JSON serialized error message.
+ @rtype list
+ """
+ start_response("%d %s" % (status, httplib.responses[status]),
+ [self.CONTENT_TYPE_JSON])
+ err = {"error": description}
+ if message:
+ err['message'] = message
+ return [json.dumps(err)]
+
+ def _unauthorized_error(self, start_response, message):
+ """
+ Send a unauth error.
+
+ @param message: The error message.
+ @type message: str
+ @param start_response: Callable of the form start_response(status,
+ response_headers, exc_info=None).
+ @type start_response: callable
+
+ @return: List with JSON serialized error message.
+ @rtype list
+ """
+ return self._error(
+ start_response,
+ 401,
+ "unauthorized",
+ message)
+
+ def __call__(self, environ, start_response):
+ """
+ Handle a WSGI call to the authentication application.
+
+ @param environ: Dictionary containing CGI variables.
+ @type environ: dict
+ @param start_response: Callable of the form start_response(status,
+ response_headers, exc_info=None).
+ @type start_response: callable
+
+ @return: Target application results if authentication succeeds, an
+ error message otherwise.
+ @rtype: list
+ """
+ # check for authentication header
+ auth = environ.get(self.HTTP_AUTH_KEY)
+ if not auth:
+ return self._unauthorized_error(
+ start_response, "Missing authentication header.")
+
+ # get authentication data
+ scheme, encoded = auth.split(None, 1)
+ uuid, auth_data = encoded.decode('base64').split(':', 1)
+ if not self._verify_authentication_scheme(scheme):
+ return self._unauthorized_error("Wrong authentication scheme")
+
+ # verify if user is athenticated
+ if not self._verify_authentication_data(uuid, auth_data):
+ return self._unauthorized_error(
+ start_response,
+ self._get_auth_error_string())
+
+ # verify if user is authorized to perform action
+ if not self._verify_authorization(environ, uuid):
+ return self._unauthorized_error(
+ start_response,
+ "Unauthorized action.")
+
+ # move on to the real Soledad app
+ del environ[self.HTTP_AUTH_KEY]
+ return self._app(environ, start_response)
+
+ @abstractmethod
+ def _verify_authentication_scheme(self, scheme):
+ """
+ Verify if authentication scheme is valid.
+
+ @param scheme: Auth scheme extracted from the HTTP_AUTHORIZATION
+ header.
+ @type scheme: str
+
+ @return: Whether the authentitcation scheme is valid.
+ """
+ return None
+
+ @abstractmethod
+ def _verify_authentication_data(self, uuid, auth_data):
+ """
+ Verify valid authenticatiion for this request.
+
+ @param uuid: The user's uuid.
+ @type uuid: str
+ @param auth_data: Authentication data.
+ @type auth_data: str
+
+ @return: Whether the token is valid for authenticating the request.
+ @rtype: bool
+ """
+ return None
+
+ def _verify_authorization(self, environ, uuid):
+ """
+ Verify if the user is authorized to perform the requested action over
+ the requested database.
+
+ @param environ: Dictionary containing CGI variables.
+ @type environ: dict
+ @param uuid: The user's uuid.
+ @type uuid: str
+
+ @return: Whether the user is authorize to perform the requested action
+ over the requested db.
+ @rtype: bool
+ """
+ return URLToAuthorization(
+ uuid, self._app.SHARED_DB_NAME,
+ self._app.USER_DB_PREFIX
+ ).is_authorized(environ)
+
+ @abstractmethod
+ def _get_auth_error_string(self):
+ """
+ Return an error string specific for each kind of authentication method.
+
+ @return: The error string.
+ """
+ return None
+
+
+class SoledadTokenAuthMiddleware(SoledadAuthMiddleware):
+ """
+ Token based authentication.
+ """
+
+ TOKENS_DB = "tokens"
+ TOKENS_TYPE_KEY = "type"
+ TOKENS_TYPE_DEF = "Token"
+ TOKENS_USER_ID_KEY = "user_id"
+
+ TOKEN_AUTH_ERROR_STRING = "Incorrect address or token."
+
+ def _verify_authentication_scheme(self, scheme):
+ """
+ Verify if authentication scheme is valid.
+
+ @param scheme: Auth scheme extracted from the HTTP_AUTHORIZATION
+ header.
+ @type scheme: str
+
+ @return: Whether the authentitcation scheme is valid.
+ """
+ if scheme.lower() != 'token':
+ return False
+ return True
+
+ def _verify_authentication_data(self, uuid, auth_data):
+ """
+ Extract token from C{auth_data} and proceed with verification of
+ C{uuid} authentication.
+
+ @param uuid: The user UID.
+ @type uuid: str
+ @param auth_data: Authentication data (i.e. the token).
+ @type auth_data: str
+
+ @return: Whether the token is valid for authenticating the request.
+ @rtype: bool
+ """
+ token = auth_data # we expect a cleartext token at this point
+ return self._verify_token_in_couchdb(uuid, token)
+
+ def _verify_token_in_couchdb(self, uuid, token):
+ """
+ Query couchdb to decide if C{token} is valid for C{uuid}.
+
+ @param uuid: The user uuid.
+ @type uuid: str
+ @param token: The token.
+ @type token: str
+ """
+ server = Server(url=self._app.state.couch_url)
+ try:
+ dbname = self.TOKENS_DB
+ db = server[dbname]
+ token = db.get(token)
+ if token is None:
+ return False
+ return token[self.TOKENS_TYPE_KEY] == self.TOKENS_TYPE_DEF and \
+ token[self.TOKENS_USER_ID_KEY] == uuid
+ except Exception as e:
+ log.err(e)
+ return False
+ return True
+
+ def _get_auth_error_string(self):
+ """
+ Get the error string for token auth.
+
+ @return: The error string.
+ """
+ return self.TOKEN_AUTH_ERROR_STRING