mirror of
https://mau.dev/maunium/synapse.git
synced 2024-12-16 12:53:51 +01:00
447 lines
16 KiB
Python
447 lines
16 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014, 2015 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
from twisted.internet import defer
|
|
|
|
from ._base import BaseHandler
|
|
from synapse.api.constants import LoginType
|
|
from synapse.types import UserID
|
|
from synapse.api.errors import LoginError, Codes
|
|
from synapse.util.async import run_on_reactor
|
|
|
|
from twisted.web.client import PartialDownloadError
|
|
|
|
import logging
|
|
import bcrypt
|
|
import pymacaroons
|
|
import simplejson
|
|
|
|
import synapse.util.stringutils as stringutils
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class AuthHandler(BaseHandler):
|
|
|
|
def __init__(self, hs):
|
|
super(AuthHandler, self).__init__(hs)
|
|
self.checkers = {
|
|
LoginType.PASSWORD: self._check_password_auth,
|
|
LoginType.RECAPTCHA: self._check_recaptcha,
|
|
LoginType.EMAIL_IDENTITY: self._check_email_identity,
|
|
LoginType.DUMMY: self._check_dummy_auth,
|
|
}
|
|
self.sessions = {}
|
|
|
|
@defer.inlineCallbacks
|
|
def check_auth(self, flows, clientdict, clientip):
|
|
"""
|
|
Takes a dictionary sent by the client in the login / registration
|
|
protocol and handles the login flow.
|
|
|
|
As a side effect, this function fills in the 'creds' key on the user's
|
|
session with a map, which maps each auth-type (str) to the relevant
|
|
identity authenticated by that auth-type (mostly str, but for captcha, bool).
|
|
|
|
Args:
|
|
flows (list): A list of login flows. Each flow is an ordered list of
|
|
strings representing auth-types. At least one full
|
|
flow must be completed in order for auth to be successful.
|
|
clientdict: The dictionary from the client root level, not the
|
|
'auth' key: this method prompts for auth if none is sent.
|
|
clientip (str): The IP address of the client.
|
|
Returns:
|
|
A tuple of (authed, dict, dict) where authed is true if the client
|
|
has successfully completed an auth flow. If it is true, the first
|
|
dict contains the authenticated credentials of each stage.
|
|
|
|
If authed is false, the first dictionary is the server response to
|
|
the login request and should be passed back to the client.
|
|
|
|
In either case, the second dict contains the parameters for this
|
|
request (which may have been given only in a previous call).
|
|
"""
|
|
|
|
authdict = None
|
|
sid = None
|
|
if clientdict and 'auth' in clientdict:
|
|
authdict = clientdict['auth']
|
|
del clientdict['auth']
|
|
if 'session' in authdict:
|
|
sid = authdict['session']
|
|
session = self._get_session_info(sid)
|
|
|
|
if len(clientdict) > 0:
|
|
# This was designed to allow the client to omit the parameters
|
|
# and just supply the session in subsequent calls so it split
|
|
# auth between devices by just sharing the session, (eg. so you
|
|
# could continue registration from your phone having clicked the
|
|
# email auth link on there). It's probably too open to abuse
|
|
# because it lets unauthenticated clients store arbitrary objects
|
|
# on a home server.
|
|
# Revisit: Assumimg the REST APIs do sensible validation, the data
|
|
# isn't arbintrary.
|
|
session['clientdict'] = clientdict
|
|
self._save_session(session)
|
|
elif 'clientdict' in session:
|
|
clientdict = session['clientdict']
|
|
|
|
if not authdict:
|
|
defer.returnValue(
|
|
(False, self._auth_dict_for_flows(flows, session), clientdict)
|
|
)
|
|
|
|
if 'creds' not in session:
|
|
session['creds'] = {}
|
|
creds = session['creds']
|
|
|
|
# check auth type currently being presented
|
|
if 'type' in authdict:
|
|
if authdict['type'] not in self.checkers:
|
|
raise LoginError(400, "", Codes.UNRECOGNIZED)
|
|
result = yield self.checkers[authdict['type']](authdict, clientip)
|
|
if result:
|
|
creds[authdict['type']] = result
|
|
self._save_session(session)
|
|
|
|
for f in flows:
|
|
if len(set(f) - set(creds.keys())) == 0:
|
|
logger.info("Auth completed with creds: %r", creds)
|
|
self._remove_session(session)
|
|
defer.returnValue((True, creds, clientdict))
|
|
|
|
ret = self._auth_dict_for_flows(flows, session)
|
|
ret['completed'] = creds.keys()
|
|
defer.returnValue((False, ret, clientdict))
|
|
|
|
@defer.inlineCallbacks
|
|
def add_oob_auth(self, stagetype, authdict, clientip):
|
|
"""
|
|
Adds the result of out-of-band authentication into an existing auth
|
|
session. Currently used for adding the result of fallback auth.
|
|
"""
|
|
if stagetype not in self.checkers:
|
|
raise LoginError(400, "", Codes.MISSING_PARAM)
|
|
if 'session' not in authdict:
|
|
raise LoginError(400, "", Codes.MISSING_PARAM)
|
|
|
|
sess = self._get_session_info(
|
|
authdict['session']
|
|
)
|
|
if 'creds' not in sess:
|
|
sess['creds'] = {}
|
|
creds = sess['creds']
|
|
|
|
result = yield self.checkers[stagetype](authdict, clientip)
|
|
if result:
|
|
creds[stagetype] = result
|
|
self._save_session(sess)
|
|
defer.returnValue(True)
|
|
defer.returnValue(False)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_password_auth(self, authdict, _):
|
|
if "user" not in authdict or "password" not in authdict:
|
|
raise LoginError(400, "", Codes.MISSING_PARAM)
|
|
|
|
user_id = authdict["user"]
|
|
password = authdict["password"]
|
|
if not user_id.startswith('@'):
|
|
user_id = UserID.create(user_id, self.hs.hostname).to_string()
|
|
|
|
user_id, password_hash = yield self._find_user_id_and_pwd_hash(user_id)
|
|
self._check_password(user_id, password, password_hash)
|
|
defer.returnValue(user_id)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_recaptcha(self, authdict, clientip):
|
|
try:
|
|
user_response = authdict["response"]
|
|
except KeyError:
|
|
# Client tried to provide captcha but didn't give the parameter:
|
|
# bad request.
|
|
raise LoginError(
|
|
400, "Captcha response is required",
|
|
errcode=Codes.CAPTCHA_NEEDED
|
|
)
|
|
|
|
logger.info(
|
|
"Submitting recaptcha response %s with remoteip %s",
|
|
user_response, clientip
|
|
)
|
|
|
|
# TODO: get this from the homeserver rather than creating a new one for
|
|
# each request
|
|
try:
|
|
client = self.hs.get_simple_http_client()
|
|
resp_body = yield client.post_urlencoded_get_json(
|
|
self.hs.config.recaptcha_siteverify_api,
|
|
args={
|
|
'secret': self.hs.config.recaptcha_private_key,
|
|
'response': user_response,
|
|
'remoteip': clientip,
|
|
}
|
|
)
|
|
except PartialDownloadError as pde:
|
|
# Twisted is silly
|
|
data = pde.response
|
|
resp_body = simplejson.loads(data)
|
|
|
|
if 'success' in resp_body and resp_body['success']:
|
|
defer.returnValue(True)
|
|
raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_email_identity(self, authdict, _):
|
|
yield run_on_reactor()
|
|
|
|
if 'threepid_creds' not in authdict:
|
|
raise LoginError(400, "Missing threepid_creds", Codes.MISSING_PARAM)
|
|
|
|
threepid_creds = authdict['threepid_creds']
|
|
identity_handler = self.hs.get_handlers().identity_handler
|
|
|
|
logger.info("Getting validated threepid. threepidcreds: %r" % (threepid_creds,))
|
|
threepid = yield identity_handler.threepid_from_creds(threepid_creds)
|
|
|
|
if not threepid:
|
|
raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
|
|
|
|
threepid['threepid_creds'] = authdict['threepid_creds']
|
|
|
|
defer.returnValue(threepid)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_dummy_auth(self, authdict, _):
|
|
yield run_on_reactor()
|
|
defer.returnValue(True)
|
|
|
|
def _get_params_recaptcha(self):
|
|
return {"public_key": self.hs.config.recaptcha_public_key}
|
|
|
|
def _auth_dict_for_flows(self, flows, session):
|
|
public_flows = []
|
|
for f in flows:
|
|
public_flows.append(f)
|
|
|
|
get_params = {
|
|
LoginType.RECAPTCHA: self._get_params_recaptcha,
|
|
}
|
|
|
|
params = {}
|
|
|
|
for f in public_flows:
|
|
for stage in f:
|
|
if stage in get_params and stage not in params:
|
|
params[stage] = get_params[stage]()
|
|
|
|
return {
|
|
"session": session['id'],
|
|
"flows": [{"stages": f} for f in public_flows],
|
|
"params": params
|
|
}
|
|
|
|
def _get_session_info(self, session_id):
|
|
if session_id not in self.sessions:
|
|
session_id = None
|
|
|
|
if not session_id:
|
|
# create a new session
|
|
while session_id is None or session_id in self.sessions:
|
|
session_id = stringutils.random_string(24)
|
|
self.sessions[session_id] = {
|
|
"id": session_id,
|
|
}
|
|
|
|
return self.sessions[session_id]
|
|
|
|
@defer.inlineCallbacks
|
|
def login_with_password(self, user_id, password):
|
|
"""
|
|
Authenticates the user with their username and password.
|
|
|
|
Used only by the v1 login API.
|
|
|
|
Args:
|
|
user_id (str): User ID
|
|
password (str): Password
|
|
Returns:
|
|
A tuple of:
|
|
The user's ID.
|
|
The access token for the user's session.
|
|
The refresh token for the user's session.
|
|
Raises:
|
|
StoreError if there was a problem storing the token.
|
|
LoginError if there was an authentication problem.
|
|
"""
|
|
user_id, password_hash = yield self._find_user_id_and_pwd_hash(user_id)
|
|
self._check_password(user_id, password, password_hash)
|
|
|
|
logger.info("Logging in user %s", user_id)
|
|
access_token = yield self.issue_access_token(user_id)
|
|
refresh_token = yield self.issue_refresh_token(user_id)
|
|
defer.returnValue((user_id, access_token, refresh_token))
|
|
|
|
@defer.inlineCallbacks
|
|
def login_with_cas_user_id(self, user_id):
|
|
"""
|
|
Authenticates the user with the given user ID,
|
|
intended to have been captured from a CAS response
|
|
|
|
Args:
|
|
user_id (str): User ID
|
|
Returns:
|
|
A tuple of:
|
|
The user's ID.
|
|
The access token for the user's session.
|
|
The refresh token for the user's session.
|
|
Raises:
|
|
StoreError if there was a problem storing the token.
|
|
LoginError if there was an authentication problem.
|
|
"""
|
|
user_id, ignored = yield self._find_user_id_and_pwd_hash(user_id)
|
|
|
|
logger.info("Logging in user %s", user_id)
|
|
access_token = yield self.issue_access_token(user_id)
|
|
refresh_token = yield self.issue_refresh_token(user_id)
|
|
defer.returnValue((user_id, access_token, refresh_token))
|
|
|
|
@defer.inlineCallbacks
|
|
def does_user_exist(self, user_id):
|
|
try:
|
|
yield self._find_user_id_and_pwd_hash(user_id)
|
|
defer.returnValue(True)
|
|
except LoginError:
|
|
defer.returnValue(False)
|
|
|
|
@defer.inlineCallbacks
|
|
def _find_user_id_and_pwd_hash(self, user_id):
|
|
"""Checks to see if a user with the given id exists. Will check case
|
|
insensitively, but will throw if there are multiple inexact matches.
|
|
|
|
Returns:
|
|
tuple: A 2-tuple of `(canonical_user_id, password_hash)`
|
|
"""
|
|
user_infos = yield self.store.get_users_by_id_case_insensitive(user_id)
|
|
if not user_infos:
|
|
logger.warn("Attempted to login as %s but they do not exist", user_id)
|
|
raise LoginError(403, "", errcode=Codes.FORBIDDEN)
|
|
|
|
if len(user_infos) > 1:
|
|
if user_id not in user_infos:
|
|
logger.warn(
|
|
"Attempted to login as %s but it matches more than one user "
|
|
"inexactly: %r",
|
|
user_id, user_infos.keys()
|
|
)
|
|
raise LoginError(403, "", errcode=Codes.FORBIDDEN)
|
|
|
|
defer.returnValue((user_id, user_infos[user_id]))
|
|
else:
|
|
defer.returnValue(user_infos.popitem())
|
|
|
|
def _check_password(self, user_id, password, stored_hash):
|
|
"""Checks that user_id has passed password, raises LoginError if not."""
|
|
if not self.validate_hash(password, stored_hash):
|
|
logger.warn("Failed password login for user %s", user_id)
|
|
raise LoginError(403, "", errcode=Codes.FORBIDDEN)
|
|
|
|
@defer.inlineCallbacks
|
|
def issue_access_token(self, user_id):
|
|
access_token = self.generate_access_token(user_id)
|
|
yield self.store.add_access_token_to_user(user_id, access_token)
|
|
defer.returnValue(access_token)
|
|
|
|
@defer.inlineCallbacks
|
|
def issue_refresh_token(self, user_id):
|
|
refresh_token = self.generate_refresh_token(user_id)
|
|
yield self.store.add_refresh_token_to_user(user_id, refresh_token)
|
|
defer.returnValue(refresh_token)
|
|
|
|
def generate_access_token(self, user_id):
|
|
macaroon = self._generate_base_macaroon(user_id)
|
|
macaroon.add_first_party_caveat("type = access")
|
|
now = self.hs.get_clock().time_msec()
|
|
expiry = now + (60 * 60 * 1000)
|
|
macaroon.add_first_party_caveat("time < %d" % (expiry,))
|
|
return macaroon.serialize()
|
|
|
|
def generate_refresh_token(self, user_id):
|
|
m = self._generate_base_macaroon(user_id)
|
|
m.add_first_party_caveat("type = refresh")
|
|
# Important to add a nonce, because otherwise every refresh token for a
|
|
# user will be the same.
|
|
m.add_first_party_caveat("nonce = %s" % (
|
|
stringutils.random_string_with_symbols(16),
|
|
))
|
|
return m.serialize()
|
|
|
|
def _generate_base_macaroon(self, user_id):
|
|
macaroon = pymacaroons.Macaroon(
|
|
location=self.hs.config.server_name,
|
|
identifier="key",
|
|
key=self.hs.config.macaroon_secret_key)
|
|
macaroon.add_first_party_caveat("gen = 1")
|
|
macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
|
|
return macaroon
|
|
|
|
@defer.inlineCallbacks
|
|
def set_password(self, user_id, newpassword):
|
|
password_hash = self.hash(newpassword)
|
|
|
|
yield self.store.user_set_password_hash(user_id, password_hash)
|
|
yield self.store.user_delete_access_tokens(user_id)
|
|
yield self.hs.get_pusherpool().remove_pushers_by_user(user_id)
|
|
yield self.store.flush_user(user_id)
|
|
|
|
@defer.inlineCallbacks
|
|
def add_threepid(self, user_id, medium, address, validated_at):
|
|
yield self.store.user_add_threepid(
|
|
user_id, medium, address, validated_at,
|
|
self.hs.get_clock().time_msec()
|
|
)
|
|
|
|
def _save_session(self, session):
|
|
# TODO: Persistent storage
|
|
logger.debug("Saving session %s", session)
|
|
self.sessions[session["id"]] = session
|
|
|
|
def _remove_session(self, session):
|
|
logger.debug("Removing session %s", session)
|
|
del self.sessions[session["id"]]
|
|
|
|
def hash(self, password):
|
|
"""Computes a secure hash of password.
|
|
|
|
Args:
|
|
password (str): Password to hash.
|
|
|
|
Returns:
|
|
Hashed password (str).
|
|
"""
|
|
return bcrypt.hashpw(password, bcrypt.gensalt())
|
|
|
|
def validate_hash(self, password, stored_hash):
|
|
"""Validates that self.hash(password) == stored_hash.
|
|
|
|
Args:
|
|
password (str): Password to hash.
|
|
stored_hash (str): Expected hash value.
|
|
|
|
Returns:
|
|
Whether self.hash(password) == stored_hash (bool).
|
|
"""
|
|
return bcrypt.checkpw(password, stored_hash)
|