mirror of
https://github.com/pgadmin-org/pgadmin4.git
synced 2024-11-27 11:10:19 -06:00
338 lines
9.6 KiB
Python
338 lines
9.6 KiB
Python
##########################################################################
|
|
#
|
|
# pgAdmin 4 - PostgreSQL Tools
|
|
#
|
|
# Copyright (C) 2013 - 2018, The pgAdmin Development Team
|
|
# This software is released under the PostgreSQL Licence
|
|
#
|
|
##########################################################################
|
|
|
|
"""
|
|
Implements the server-side session management.
|
|
|
|
Credit/Reference: http://flask.pocoo.org/snippets/109/
|
|
|
|
Modified to support both Python 2.6+ & Python 3.x
|
|
"""
|
|
|
|
import base64
|
|
import datetime
|
|
import hmac
|
|
import hashlib
|
|
import os
|
|
import random
|
|
import string
|
|
import time
|
|
from uuid import uuid4
|
|
from flask import current_app, request, flash, redirect
|
|
from flask_login import login_url
|
|
from pgadmin.utils.ajax import make_json_response
|
|
|
|
try:
|
|
from cPickle import dump, load
|
|
except ImportError:
|
|
from pickle import dump, load
|
|
|
|
try:
|
|
from collections import OrderedDict
|
|
except ImportError:
|
|
from ordereddict import OrderedDict
|
|
|
|
from flask.sessions import SessionInterface, SessionMixin
|
|
from werkzeug.datastructures import CallbackDict
|
|
|
|
|
|
def _calc_hmac(body, secret):
|
|
return base64.b64encode(
|
|
hmac.new(
|
|
secret.encode(), body.encode(), hashlib.sha1
|
|
).digest()
|
|
).decode()
|
|
|
|
|
|
class ManagedSession(CallbackDict, SessionMixin):
|
|
def __init__(self, initial=None, sid=None, new=False, randval=None,
|
|
hmac_digest=None):
|
|
def on_update(self):
|
|
self.modified = True
|
|
|
|
CallbackDict.__init__(self, initial, on_update)
|
|
self.sid = sid
|
|
self.new = new
|
|
self.modified = False
|
|
self.randval = randval
|
|
self.last_write = None
|
|
self.force_write = False
|
|
self.hmac_digest = hmac_digest
|
|
|
|
def sign(self, secret):
|
|
if not self.hmac_digest:
|
|
if hasattr(string, 'lowercase'):
|
|
population = string.lowercase
|
|
# If script is running under python3
|
|
elif hasattr(string, 'ascii_lowercase'):
|
|
population = string.ascii_lowercase
|
|
population += string.digits
|
|
|
|
self.randval = ''.join(random.sample(population, 20))
|
|
self.hmac_digest = _calc_hmac(
|
|
'%s:%s' % (self.sid, self.randval), secret)
|
|
|
|
|
|
class SessionManager(object):
|
|
def new_session(self):
|
|
'Create a new session'
|
|
raise NotImplementedError
|
|
|
|
def exists(self, sid):
|
|
'Does the given session-id exist?'
|
|
raise NotImplementedError
|
|
|
|
def remove(self, sid):
|
|
'Remove the session'
|
|
raise NotImplementedError
|
|
|
|
def get(self, sid, digest):
|
|
'Retrieve a managed session by session-id, checking the HMAC digest'
|
|
raise NotImplementedError
|
|
|
|
def put(self, session):
|
|
'Store a managed session'
|
|
raise NotImplementedError
|
|
|
|
|
|
class CachingSessionManager(SessionManager):
|
|
def __init__(self, parent, num_to_store):
|
|
self.parent = parent
|
|
self.num_to_store = num_to_store
|
|
self._cache = OrderedDict()
|
|
|
|
def _normalize(self):
|
|
if len(self._cache) > self.num_to_store:
|
|
# Flush 20% of the cache
|
|
while len(self._cache) > (self.num_to_store * 0.8):
|
|
self._cache.popitem(False)
|
|
|
|
def new_session(self):
|
|
session = self.parent.new_session()
|
|
self._cache[session.sid] = session
|
|
self._normalize()
|
|
|
|
return session
|
|
|
|
def remove(self, sid):
|
|
self.parent.remove(sid)
|
|
if sid in self._cache:
|
|
del self._cache[sid]
|
|
|
|
def exists(self, sid):
|
|
if sid in self._cache:
|
|
return True
|
|
return self.parent.exists(sid)
|
|
|
|
def get(self, sid, digest):
|
|
session = None
|
|
if sid in self._cache:
|
|
session = self._cache[sid]
|
|
if session.hmac_digest != digest:
|
|
session = None
|
|
|
|
# reset order in Dict
|
|
del self._cache[sid]
|
|
|
|
if not session:
|
|
session = self.parent.get(sid, digest)
|
|
|
|
self._cache[sid] = session
|
|
self._normalize()
|
|
|
|
return session
|
|
|
|
def put(self, session):
|
|
self.parent.put(session)
|
|
if session.sid in self._cache:
|
|
try:
|
|
del self._cache[session.sid]
|
|
except Exception:
|
|
pass
|
|
self._cache[session.sid] = session
|
|
self._normalize()
|
|
|
|
|
|
class FileBackedSessionManager(SessionManager):
|
|
|
|
def __init__(self, path, secret, disk_write_delay):
|
|
self.path = path
|
|
self.secret = secret
|
|
self.disk_write_delay = disk_write_delay
|
|
if not os.path.exists(self.path):
|
|
os.makedirs(self.path)
|
|
|
|
def exists(self, sid):
|
|
fname = os.path.join(self.path, sid)
|
|
return os.path.exists(fname)
|
|
|
|
def remove(self, sid):
|
|
fname = os.path.join(self.path, sid)
|
|
if os.path.exists(fname):
|
|
os.unlink(fname)
|
|
|
|
def new_session(self):
|
|
sid = str(uuid4())
|
|
fname = os.path.join(self.path, sid)
|
|
|
|
while os.path.exists(fname):
|
|
sid = str(uuid4())
|
|
fname = os.path.join(self.path, sid)
|
|
|
|
# touch the file
|
|
with open(fname, 'wb'):
|
|
pass
|
|
|
|
return ManagedSession(sid=sid)
|
|
|
|
def get(self, sid, digest):
|
|
'Retrieve a managed session by session-id, checking the HMAC digest'
|
|
|
|
fname = os.path.join(self.path, sid)
|
|
data = None
|
|
hmac_digest = None
|
|
randval = None
|
|
|
|
if os.path.exists(fname):
|
|
try:
|
|
with open(fname, 'rb') as f:
|
|
randval, hmac_digest, data = load(f)
|
|
except Exception:
|
|
pass
|
|
|
|
if not data:
|
|
return self.new_session()
|
|
|
|
# This assumes the file is correct, if you really want to
|
|
# make sure the session is good from the server side, you
|
|
# can re-calculate the hmac
|
|
|
|
if hmac_digest != digest:
|
|
return self.new_session()
|
|
|
|
return ManagedSession(
|
|
data, sid=sid, randval=randval, hmac_digest=hmac_digest
|
|
)
|
|
|
|
def put(self, session):
|
|
"""Store a managed session"""
|
|
current_time = time.time()
|
|
if not session.hmac_digest:
|
|
session.sign(self.secret)
|
|
elif not session.force_write:
|
|
if session.last_write is not None and \
|
|
(current_time - float(session.last_write)) < \
|
|
self.disk_write_delay:
|
|
return
|
|
|
|
session.last_write = current_time
|
|
session.force_write = False
|
|
fname = os.path.join(self.path, session.sid)
|
|
with open(fname, 'wb') as f:
|
|
dump(
|
|
(session.randval, session.hmac_digest, dict(session)),
|
|
f
|
|
)
|
|
|
|
|
|
class ManagedSessionInterface(SessionInterface):
|
|
def __init__(self, manager, skip_paths, cookie_timedelta):
|
|
self.manager = manager
|
|
self.skip_paths = skip_paths
|
|
self.cookie_timedelta = cookie_timedelta
|
|
|
|
def get_expiration_time(self, app, session):
|
|
if session.permanent:
|
|
return app.permanent_session_lifetime
|
|
return datetime.datetime.now() + self.cookie_timedelta
|
|
|
|
def open_session(self, app, request):
|
|
cookie_val = request.cookies.get(app.session_cookie_name)
|
|
|
|
if not cookie_val or '!' not in cookie_val:
|
|
# Don't bother creating a cookie for static resources
|
|
for sp in self.skip_paths:
|
|
if request.path.startswith(sp):
|
|
return None
|
|
|
|
return self.manager.new_session()
|
|
|
|
sid, digest = cookie_val.split('!', 1)
|
|
|
|
if self.manager.exists(sid):
|
|
return self.manager.get(sid, digest)
|
|
|
|
return self.manager.new_session()
|
|
|
|
def save_session(self, app, session, response):
|
|
domain = self.get_cookie_domain(app)
|
|
if not session:
|
|
self.manager.remove(session.sid)
|
|
if session.modified:
|
|
response.delete_cookie(app.session_cookie_name, domain=domain)
|
|
return
|
|
|
|
if not session.modified:
|
|
# No need to save an unaltered session
|
|
# TODO: put logic here to test if the cookie is older than N days,
|
|
# if so, update the expiration date
|
|
return
|
|
|
|
self.manager.put(session)
|
|
session.modified = False
|
|
|
|
cookie_exp = self.get_expiration_time(app, session)
|
|
response.set_cookie(
|
|
app.session_cookie_name,
|
|
'%s!%s' % (session.sid, session.hmac_digest),
|
|
expires=cookie_exp, httponly=True, domain=domain
|
|
)
|
|
|
|
|
|
def create_session_interface(app, skip_paths=[]):
|
|
return ManagedSessionInterface(
|
|
CachingSessionManager(
|
|
FileBackedSessionManager(
|
|
app.config['SESSION_DB_PATH'],
|
|
app.config['SECRET_KEY'],
|
|
app.config.get('PGADMIN_SESSION_DISK_WRITE_DELAY', 10)
|
|
),
|
|
1000
|
|
), skip_paths,
|
|
datetime.timedelta(days=1))
|
|
|
|
|
|
def pga_unauthorised():
|
|
|
|
lm = current_app.login_manager
|
|
login_message = None
|
|
|
|
if lm.login_message:
|
|
if lm.localize_callback is not None:
|
|
login_message = lm.localize_callback(lm.login_message)
|
|
else:
|
|
login_message = lm.login_message
|
|
|
|
if not lm.login_view or request.is_xhr:
|
|
# Only 401 is not enough to distinguish pgAdmin login is required.
|
|
# There are other cases when we return 401. For eg. wrong password
|
|
# supplied while connecting to server.
|
|
# So send additional 'info' message.
|
|
return make_json_response(
|
|
status=401,
|
|
success=0,
|
|
errormsg=login_message,
|
|
info='PGADMIN_LOGIN_REQUIRED'
|
|
)
|
|
|
|
if login_message:
|
|
flash(login_message, category=lm.login_message_category)
|
|
|
|
return redirect(login_url(lm.login_view, request.url))
|