mirror of
https://github.com/Mailu/Mailu.git
synced 2024-12-20 20:22:38 +02:00
455 lines
13 KiB
Python
455 lines
13 KiB
Python
""" Mailu admin app utilities
|
|
"""
|
|
|
|
try:
|
|
import cPickle as pickle
|
|
except ImportError:
|
|
import pickle
|
|
|
|
import hmac
|
|
import secrets
|
|
import time
|
|
|
|
from multiprocessing import Value
|
|
|
|
from mailu import limiter
|
|
|
|
import flask
|
|
import flask_login
|
|
import flask_migrate
|
|
import flask_babel
|
|
import redis
|
|
|
|
from flask.sessions import SessionMixin, SessionInterface
|
|
from itsdangerous.encoding import want_bytes
|
|
from werkzeug.datastructures import CallbackDict
|
|
from werkzeug.contrib import fixers
|
|
|
|
|
|
# Login configuration
|
|
login = flask_login.LoginManager()
|
|
login.login_view = "ui.login"
|
|
|
|
@login.unauthorized_handler
|
|
def handle_needs_login():
|
|
""" redirect unauthorized requests to login page """
|
|
return flask.redirect(
|
|
flask.url_for('ui.login', next=flask.request.endpoint)
|
|
)
|
|
|
|
# Rate limiter
|
|
limiter = limiter.LimitWraperFactory()
|
|
|
|
# Application translation
|
|
babel = flask_babel.Babel()
|
|
|
|
@babel.localeselector
|
|
def get_locale():
|
|
""" selects locale for translation """
|
|
translations = [str(translation) for translation in babel.list_translations()]
|
|
return flask.request.accept_languages.best_match(translations)
|
|
|
|
|
|
# Proxy fixer
|
|
class PrefixMiddleware(object):
|
|
""" fix proxy headers """
|
|
def __init__(self):
|
|
self.app = None
|
|
|
|
def __call__(self, environ, start_response):
|
|
prefix = environ.get('HTTP_X_FORWARDED_PREFIX', '')
|
|
if prefix:
|
|
environ['SCRIPT_NAME'] = prefix
|
|
return self.app(environ, start_response)
|
|
|
|
def init_app(self, app):
|
|
self.app = fixers.ProxyFix(app.wsgi_app, x_for=1, x_proto=1)
|
|
app.wsgi_app = self
|
|
|
|
proxy = PrefixMiddleware()
|
|
|
|
|
|
# Data migrate
|
|
migrate = flask_migrate.Migrate()
|
|
|
|
|
|
# session store (inspired by https://github.com/mbr/flask-kvsession)
|
|
class RedisStore:
|
|
""" Stores session data in a redis db. """
|
|
|
|
has_ttl = True
|
|
|
|
def __init__(self, redisstore):
|
|
self.redis = redisstore
|
|
|
|
def get(self, key):
|
|
""" load item from store. """
|
|
value = self.redis.get(key)
|
|
if value is None:
|
|
raise KeyError(key)
|
|
return value
|
|
|
|
def put(self, key, value, ttl=None):
|
|
""" save item to store. """
|
|
if ttl:
|
|
self.redis.setex(key, int(ttl), value)
|
|
else:
|
|
self.redis.set(key, value)
|
|
|
|
def delete(self, key):
|
|
""" delete item from store. """
|
|
self.redis.delete(key)
|
|
|
|
def list(self, prefix=None):
|
|
""" return list of keys starting with prefix """
|
|
if prefix:
|
|
prefix += b'*'
|
|
return list(self.redis.scan_iter(match=prefix))
|
|
|
|
class DictStore:
|
|
""" Stores session data in a python dict. """
|
|
|
|
has_ttl = False
|
|
|
|
def __init__(self):
|
|
self.dict = {}
|
|
|
|
def get(self, key):
|
|
""" load item from store. """
|
|
return self.dict[key]
|
|
|
|
def put(self, key, value, ttl_secs=None):
|
|
""" save item to store. """
|
|
self.dict[key] = value
|
|
|
|
def delete(self, key):
|
|
""" delete item from store. """
|
|
try:
|
|
del self.dict[key]
|
|
except KeyError:
|
|
pass
|
|
|
|
def list(self, prefix=None):
|
|
""" return list of keys starting with prefix """
|
|
if prefix is None:
|
|
return list(self.dict.keys())
|
|
return [key for key in self.dict if key.startswith(prefix)]
|
|
|
|
class MailuSession(CallbackDict, SessionMixin):
|
|
""" Custom flask session storage. """
|
|
|
|
# default modified to false
|
|
modified = False
|
|
|
|
def __init__(self, key=None, app=None):
|
|
|
|
self.app = app or flask.current_app
|
|
|
|
initial = None
|
|
|
|
key = want_bytes(key)
|
|
if parsed := self.app.session_config.parse_key(key, self.app):
|
|
try:
|
|
initial = pickle.loads(app.session_store.get(key))
|
|
except (KeyError, EOFError, pickle.UnpicklingError):
|
|
# either the cookie was manipulated or we did not find the
|
|
# session in the backend or the pickled data is invalid.
|
|
# => start new session
|
|
pass
|
|
else:
|
|
(self._uid, self._sid, self._created) = parsed
|
|
self._key = key
|
|
|
|
if initial is None:
|
|
# start new session
|
|
self.new = True
|
|
self._uid = None
|
|
self._sid = None
|
|
self._created = self.app.session_config.gen_created()
|
|
self._key = None
|
|
|
|
def _on_update(obj):
|
|
obj.modified = True
|
|
|
|
CallbackDict.__init__(self, initial, _on_update)
|
|
|
|
@property
|
|
def saved(self):
|
|
""" this reflects if the session was saved. """
|
|
return self._key is not None
|
|
|
|
@property
|
|
def sid(self):
|
|
""" this reflects the session's id. """
|
|
if self._sid is None or self._uid is None or self._created is None:
|
|
return None
|
|
return b''.join([self._uid, self._sid, self._created])
|
|
|
|
def destroy(self):
|
|
""" destroy session for security reasons. """
|
|
|
|
self.delete()
|
|
|
|
self._uid = None
|
|
self._sid = None
|
|
self._created = None
|
|
|
|
self.clear()
|
|
|
|
self.modified = True
|
|
self.new = False
|
|
|
|
def regenerate(self):
|
|
""" generate new id for session to avoid `session fixation`. """
|
|
|
|
self.delete()
|
|
|
|
self._sid = None
|
|
self._created = self.app.session_config.gen_created()
|
|
|
|
self.modified = True
|
|
|
|
def delete(self):
|
|
""" Delete stored session. """
|
|
if self.saved:
|
|
self.app.session_store.delete(self._key)
|
|
self._key = None
|
|
|
|
def save(self):
|
|
""" Save session to store. """
|
|
|
|
set_cookie = False
|
|
|
|
# set uid from dict data
|
|
if self._uid is None:
|
|
self._uid = self.app.session_config.gen_uid(self.get('user_id', ''))
|
|
|
|
# create new session id for new or regenerated sessions and force setting the cookie
|
|
if self._sid is None:
|
|
self._sid = self.app.session_config.gen_sid()
|
|
set_cookie = True
|
|
|
|
# get new session key
|
|
key = self.sid
|
|
|
|
# delete old session if key has changed
|
|
if key != self._key:
|
|
self.delete()
|
|
|
|
# remember time to refresh
|
|
self['_refresh'] = int(time.time()) + self.app.permanent_session_lifetime.total_seconds()/2
|
|
|
|
# save session
|
|
self.app.session_store.put(
|
|
key,
|
|
pickle.dumps(dict(self)),
|
|
self.app.permanent_session_lifetime.total_seconds()
|
|
)
|
|
|
|
self._key = key
|
|
|
|
self.new = False
|
|
self.modified = False
|
|
|
|
return set_cookie
|
|
|
|
def needs_refresh(self):
|
|
""" Checks if server side session needs to be refreshed. """
|
|
|
|
return int(time.time()) > self.get('_refresh', 0)
|
|
|
|
class MailuSessionConfig:
|
|
""" Stores sessions crypto config """
|
|
|
|
# default size of session key parts
|
|
uid_bits = 64 # default if SESSION_KEY_BITS is not set in config
|
|
sid_bits = 128 # for now. must be multiple of 8!
|
|
time_bits = 32 # for now. must be multiple of 8!
|
|
|
|
def __init__(self, app=None):
|
|
|
|
if app is None:
|
|
app = flask.current_app
|
|
|
|
bits = app.config.get('SESSION_KEY_BITS', self.uid_bits)
|
|
if not 64 <= bits <= 256:
|
|
raise ValueError('SESSION_KEY_BITS must be between 64 and 256!')
|
|
|
|
uid_bytes = bits//8 + (bits%8>0)
|
|
sid_bytes = self.sid_bits//8
|
|
|
|
key = want_bytes(app.secret_key)
|
|
|
|
self._hmac = hmac.new(hmac.digest(key, b'SESSION_UID_HASH', digest='sha256'), digestmod='sha256')
|
|
self._uid_len = uid_bytes
|
|
self._uid_b64 = len(self._encode(bytes(uid_bytes)))
|
|
self._sid_len = sid_bytes
|
|
self._sid_b64 = len(self._encode(bytes(sid_bytes)))
|
|
self._key_min = self._uid_b64 + self._sid_b64
|
|
self._key_max = self._key_min + len(self._encode(bytes(self.time_bits//8)))
|
|
|
|
def gen_sid(self):
|
|
""" Generate random session id. """
|
|
return self._encode(secrets.token_bytes(self._sid_len))
|
|
|
|
def gen_uid(self, uid):
|
|
""" Generate hashed user id part of session key. """
|
|
_hmac = self._hmac.copy()
|
|
_hmac.update(want_bytes(uid))
|
|
return self._encode(_hmac.digest()[:self._uid_len])
|
|
|
|
def gen_created(self, now=None):
|
|
""" Generate base64 representation of creation time. """
|
|
return self._encode(int(now or time.time()).to_bytes(8, byteorder='big').lstrip(b'\0'))
|
|
|
|
def parse_key(self, key, app=None, validate=False, now=None):
|
|
""" Split key into sid, uid and creation time. """
|
|
|
|
if not (isinstance(key, bytes) and self._key_min <= len(key) <= self._key_max):
|
|
return None
|
|
|
|
uid = key[:self._uid_b64]
|
|
sid = key[self._uid_b64:self._key_min]
|
|
crt = key[self._key_min:]
|
|
|
|
# validate if parts are decodeable
|
|
created = self._decode(crt)
|
|
if created is None or self._decode(uid) is None or self._decode(sid) is None:
|
|
return None
|
|
|
|
# validate creation time when requested or store does not support ttl
|
|
if validate or not app.session_store.has_ttl:
|
|
if now is None:
|
|
now = int(time.time())
|
|
created = int.from_bytes(created, byteorder='big')
|
|
if not created < now < created + app.permanent_session_lifetime.total_seconds():
|
|
return None
|
|
|
|
return (uid, sid, crt)
|
|
|
|
def _encode(self, value):
|
|
return secrets.base64.urlsafe_b64encode(value).rstrip(b'=')
|
|
|
|
def _decode(self, value):
|
|
try:
|
|
return secrets.base64.urlsafe_b64decode(value + b'='*(4-len(value)%4))
|
|
except secrets.binascii.Error:
|
|
return None
|
|
|
|
class MailuSessionInterface(SessionInterface):
|
|
""" Custom flask session interface. """
|
|
|
|
def open_session(self, app, request):
|
|
""" Load or create session. """
|
|
return MailuSession(request.cookies.get(app.config['SESSION_COOKIE_NAME'], None), app)
|
|
|
|
def save_session(self, app, session, response):
|
|
""" Save modified session. """
|
|
|
|
# If the session is modified to be empty, remove the cookie.
|
|
# If the session is empty, return without setting the cookie.
|
|
if not session:
|
|
if session.modified:
|
|
session.delete()
|
|
response.delete_cookie(
|
|
app.session_cookie_name,
|
|
domain=self.get_cookie_domain(app),
|
|
path=self.get_cookie_path(app),
|
|
)
|
|
return
|
|
|
|
# Add a "Vary: Cookie" header if the session was accessed
|
|
if session.accessed:
|
|
response.vary.add('Cookie')
|
|
|
|
set_cookie = session.permanent and app.config['SESSION_REFRESH_EACH_REQUEST']
|
|
need_refresh = session.needs_refresh()
|
|
|
|
# save modified session or refresh unmodified session
|
|
if session.modified or need_refresh:
|
|
set_cookie |= session.save()
|
|
|
|
# set cookie on refreshed permanent sessions
|
|
if need_refresh and session.permanent:
|
|
set_cookie = True
|
|
|
|
# set or update cookie if necessary
|
|
if set_cookie:
|
|
response.set_cookie(
|
|
app.session_cookie_name,
|
|
session.sid,
|
|
expires=self.get_expiration_time(app, session),
|
|
httponly=self.get_cookie_httponly(app),
|
|
domain=self.get_cookie_domain(app),
|
|
path=self.get_cookie_path(app),
|
|
secure=self.get_cookie_secure(app),
|
|
samesite=self.get_cookie_samesite(app)
|
|
)
|
|
|
|
class MailuSessionExtension:
|
|
""" Server side session handling """
|
|
|
|
@staticmethod
|
|
def cleanup_sessions(app=None):
|
|
""" Remove invalid or expired sessions. """
|
|
|
|
app = app or flask.current_app
|
|
now = int(time.time())
|
|
|
|
count = 0
|
|
for key in app.session_store.list():
|
|
if not app.session_config.parse_key(key, app, validate=True, now=now):
|
|
app.session_store.delete(key)
|
|
count += 1
|
|
|
|
return count
|
|
|
|
@staticmethod
|
|
def prune_sessions(uid=None, keep=None, app=None):
|
|
""" Remove sessions
|
|
uid: remove all sessions (NONE) or sessions belonging to a specific user
|
|
keep: keep listed sessions
|
|
"""
|
|
|
|
keep = keep or set()
|
|
app = app or flask.current_app
|
|
|
|
prefix = None if uid is None else app.session_config.gen_uid(uid)
|
|
|
|
count = 0
|
|
for key in app.session_store.list(prefix):
|
|
if key not in keep:
|
|
app.session_store.delete(key)
|
|
count += 1
|
|
|
|
return count
|
|
|
|
def init_app(self, app):
|
|
""" Replace session management of application. """
|
|
|
|
if app.config.get('MEMORY_SESSIONS'):
|
|
# in-memory session store for use in development
|
|
app.session_store = DictStore()
|
|
|
|
else:
|
|
# redis-based session store for use in production
|
|
app.session_store = RedisStore(
|
|
redis.StrictRedis().from_url(app.config['SESSION_STORAGE_URL'])
|
|
)
|
|
|
|
# clean expired sessions oonce on first use in case lifetime was changed
|
|
def cleaner():
|
|
with cleaned.get_lock():
|
|
if not cleaned.value:
|
|
cleaned.value = True
|
|
flask.current_app.logger.error('cleaning')
|
|
MailuSessionExtension.cleanup_sessions(app)
|
|
|
|
app.before_first_request(cleaner)
|
|
|
|
app.session_config = MailuSessionConfig(app)
|
|
app.session_interface = MailuSessionInterface()
|
|
|
|
cleaned = Value('i', False)
|
|
session = MailuSessionExtension()
|