anonymousland-synapse/synapse/rest/client/v1/login.py
Richard van der Hoff 1b65ae00ac Refactor some logic from LoginRestServlet into AuthHandler
I'm going to need some more flexibility in handling login types in password
auth providers, so as a first step, move some stuff from LoginRestServlet into
AuthHandler.

In particular, we pass everything other than SAML, JWT and token logins down to
the AuthHandler, which now has responsibility for checking the login type and
fishing the password out of the login dictionary, as well as qualifying the
user_id if need be. Ideally SAML, JWT and token would go that way too, but
there's no real need for it right now and I'm trying to minimise impact.

This commit *should* be non-functional.
2017-10-31 10:48:41 +00:00

507 lines
20 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014-2016 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 synapse.api.errors import SynapseError, LoginError, Codes
from synapse.types import UserID
from synapse.http.server import finish_request
from synapse.http.servlet import parse_json_object_from_request
from synapse.util.msisdn import phone_number_to_msisdn
from .base import ClientV1RestServlet, client_path_patterns
import simplejson as json
import urllib
import urlparse
import logging
from saml2 import BINDING_HTTP_POST
from saml2 import config
from saml2.client import Saml2Client
import xml.etree.ElementTree as ET
from twisted.web.client import PartialDownloadError
logger = logging.getLogger(__name__)
def login_submission_legacy_convert(submission):
"""
If the input login submission is an old style object
(ie. with top-level user / medium / address) convert it
to a typed object.
"""
if "user" in submission:
submission["identifier"] = {
"type": "m.id.user",
"user": submission["user"],
}
del submission["user"]
if "medium" in submission and "address" in submission:
submission["identifier"] = {
"type": "m.id.thirdparty",
"medium": submission["medium"],
"address": submission["address"],
}
del submission["medium"]
del submission["address"]
def login_id_thirdparty_from_phone(identifier):
"""
Convert a phone login identifier type to a generic threepid identifier
Args:
identifier(dict): Login identifier dict of type 'm.id.phone'
Returns: Login identifier dict of type 'm.id.threepid'
"""
if "country" not in identifier or "number" not in identifier:
raise SynapseError(400, "Invalid phone-type identifier")
msisdn = phone_number_to_msisdn(identifier["country"], identifier["number"])
return {
"type": "m.id.thirdparty",
"medium": "msisdn",
"address": msisdn,
}
class LoginRestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login$")
SAML2_TYPE = "m.login.saml2"
CAS_TYPE = "m.login.cas"
TOKEN_TYPE = "m.login.token"
JWT_TYPE = "m.login.jwt"
def __init__(self, hs):
super(LoginRestServlet, self).__init__(hs)
self.idp_redirect_url = hs.config.saml2_idp_redirect_url
self.saml2_enabled = hs.config.saml2_enabled
self.jwt_enabled = hs.config.jwt_enabled
self.jwt_secret = hs.config.jwt_secret
self.jwt_algorithm = hs.config.jwt_algorithm
self.cas_enabled = hs.config.cas_enabled
self.auth_handler = self.hs.get_auth_handler()
self.device_handler = self.hs.get_device_handler()
self.handlers = hs.get_handlers()
def on_GET(self, request):
flows = []
if self.jwt_enabled:
flows.append({"type": LoginRestServlet.JWT_TYPE})
if self.saml2_enabled:
flows.append({"type": LoginRestServlet.SAML2_TYPE})
if self.cas_enabled:
flows.append({"type": LoginRestServlet.CAS_TYPE})
# While its valid for us to advertise this login type generally,
# synapse currently only gives out these tokens as part of the
# CAS login flow.
# Generally we don't want to advertise login flows that clients
# don't know how to implement, since they (currently) will always
# fall back to the fallback API if they don't understand one of the
# login flow types returned.
flows.append({"type": LoginRestServlet.TOKEN_TYPE})
flows.extend((
{"type": t} for t in self.auth_handler.get_supported_login_types()
))
return (200, {"flows": flows})
def on_OPTIONS(self, request):
return (200, {})
@defer.inlineCallbacks
def on_POST(self, request):
login_submission = parse_json_object_from_request(request)
try:
if self.saml2_enabled and (login_submission["type"] ==
LoginRestServlet.SAML2_TYPE):
relay_state = ""
if "relay_state" in login_submission:
relay_state = "&RelayState=" + urllib.quote(
login_submission["relay_state"])
result = {
"uri": "%s%s" % (self.idp_redirect_url, relay_state)
}
defer.returnValue((200, result))
elif self.jwt_enabled and (login_submission["type"] ==
LoginRestServlet.JWT_TYPE):
result = yield self.do_jwt_login(login_submission)
defer.returnValue(result)
elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
result = yield self.do_token_login(login_submission)
defer.returnValue(result)
else:
result = yield self._do_other_login(login_submission)
defer.returnValue(result)
except KeyError:
raise SynapseError(400, "Missing JSON keys.")
@defer.inlineCallbacks
def _do_other_login(self, login_submission):
"""Handle non-token/saml/jwt logins
Args:
login_submission:
Returns:
(int, object): HTTP code/response
"""
login_submission_legacy_convert(login_submission)
if "identifier" not in login_submission:
raise SynapseError(400, "Missing param: identifier")
identifier = login_submission["identifier"]
if "type" not in identifier:
raise SynapseError(400, "Login identifier has no type")
# convert phone type identifiers to generic threepids
if identifier["type"] == "m.id.phone":
identifier = login_id_thirdparty_from_phone(identifier)
# convert threepid identifiers to user IDs
if identifier["type"] == "m.id.thirdparty":
if 'medium' not in identifier or 'address' not in identifier:
raise SynapseError(400, "Invalid thirdparty identifier")
address = identifier['address']
if identifier['medium'] == 'email':
# For emails, transform the address to lowercase.
# We store all email addreses as lowercase in the DB.
# (See add_threepid in synapse/handlers/auth.py)
address = address.lower()
user_id = yield self.hs.get_datastore().get_user_id_by_threepid(
identifier['medium'], address
)
if not user_id:
raise LoginError(403, "", errcode=Codes.FORBIDDEN)
identifier = {
"type": "m.id.user",
"user": user_id,
}
# by this point, the identifier should be an m.id.user: if it's anything
# else, we haven't understood it.
if identifier["type"] != "m.id.user":
raise SynapseError(400, "Unknown login identifier type")
if "user" not in identifier:
raise SynapseError(400, "User identifier is missing 'user' key")
auth_handler = self.auth_handler
canonical_user_id = yield auth_handler.validate_login(
identifier["user"],
login_submission,
)
device_id = yield self._register_device(
canonical_user_id, login_submission,
)
access_token = yield auth_handler.get_access_token_for_user_id(
canonical_user_id, device_id,
login_submission.get("initial_device_display_name"),
)
result = {
"user_id": canonical_user_id,
"access_token": access_token,
"home_server": self.hs.hostname,
"device_id": device_id,
}
defer.returnValue((200, result))
@defer.inlineCallbacks
def do_token_login(self, login_submission):
token = login_submission['token']
auth_handler = self.auth_handler
user_id = (
yield auth_handler.validate_short_term_login_token_and_get_user_id(token)
)
device_id = yield self._register_device(user_id, login_submission)
access_token = yield auth_handler.get_access_token_for_user_id(
user_id, device_id,
login_submission.get("initial_device_display_name"),
)
result = {
"user_id": user_id, # may have changed
"access_token": access_token,
"home_server": self.hs.hostname,
"device_id": device_id,
}
defer.returnValue((200, result))
@defer.inlineCallbacks
def do_jwt_login(self, login_submission):
token = login_submission.get("token", None)
if token is None:
raise LoginError(
401, "Token field for JWT is missing",
errcode=Codes.UNAUTHORIZED
)
import jwt
from jwt.exceptions import InvalidTokenError
try:
payload = jwt.decode(token, self.jwt_secret, algorithms=[self.jwt_algorithm])
except jwt.ExpiredSignatureError:
raise LoginError(401, "JWT expired", errcode=Codes.UNAUTHORIZED)
except InvalidTokenError:
raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)
user = payload.get("sub", None)
if user is None:
raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)
user_id = UserID(user, self.hs.hostname).to_string()
auth_handler = self.auth_handler
registered_user_id = yield auth_handler.check_user_exists(user_id)
if registered_user_id:
device_id = yield self._register_device(
registered_user_id, login_submission
)
access_token = yield auth_handler.get_access_token_for_user_id(
registered_user_id, device_id,
login_submission.get("initial_device_display_name"),
)
result = {
"user_id": registered_user_id,
"access_token": access_token,
"home_server": self.hs.hostname,
}
else:
# TODO: we should probably check that the register isn't going
# to fonx/change our user_id before registering the device
device_id = yield self._register_device(user_id, login_submission)
user_id, access_token = (
yield self.handlers.registration_handler.register(localpart=user)
)
result = {
"user_id": user_id, # may have changed
"access_token": access_token,
"home_server": self.hs.hostname,
}
defer.returnValue((200, result))
def _register_device(self, user_id, login_submission):
"""Register a device for a user.
This is called after the user's credentials have been validated, but
before the access token has been issued.
Args:
(str) user_id: full canonical @user:id
(object) login_submission: dictionary supplied to /login call, from
which we pull device_id and initial_device_name
Returns:
defer.Deferred: (str) device_id
"""
device_id = login_submission.get("device_id")
initial_display_name = login_submission.get(
"initial_device_display_name")
return self.device_handler.check_device_registered(
user_id, device_id, initial_display_name
)
class SAML2RestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login/saml2", releases=())
def __init__(self, hs):
super(SAML2RestServlet, self).__init__(hs)
self.sp_config = hs.config.saml2_config_path
self.handlers = hs.get_handlers()
@defer.inlineCallbacks
def on_POST(self, request):
saml2_auth = None
try:
conf = config.SPConfig()
conf.load_file(self.sp_config)
SP = Saml2Client(conf)
saml2_auth = SP.parse_authn_request_response(
request.args['SAMLResponse'][0], BINDING_HTTP_POST)
except Exception as e: # Not authenticated
logger.exception(e)
if saml2_auth and saml2_auth.status_ok() and not saml2_auth.not_signed:
username = saml2_auth.name_id.text
handler = self.handlers.registration_handler
(user_id, token) = yield handler.register_saml2(username)
# Forward to the RelayState callback along with ava
if 'RelayState' in request.args:
request.redirect(urllib.unquote(
request.args['RelayState'][0]) +
'?status=authenticated&access_token=' +
token + '&user_id=' + user_id + '&ava=' +
urllib.quote(json.dumps(saml2_auth.ava)))
finish_request(request)
defer.returnValue(None)
defer.returnValue((200, {"status": "authenticated",
"user_id": user_id, "token": token,
"ava": saml2_auth.ava}))
elif 'RelayState' in request.args:
request.redirect(urllib.unquote(
request.args['RelayState'][0]) +
'?status=not_authenticated')
finish_request(request)
defer.returnValue(None)
defer.returnValue((200, {"status": "not_authenticated"}))
class CasRedirectServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login/cas/redirect", releases=())
def __init__(self, hs):
super(CasRedirectServlet, self).__init__(hs)
self.cas_server_url = hs.config.cas_server_url
self.cas_service_url = hs.config.cas_service_url
def on_GET(self, request):
args = request.args
if "redirectUrl" not in args:
return (400, "Redirect URL not specified for CAS auth")
client_redirect_url_param = urllib.urlencode({
"redirectUrl": args["redirectUrl"][0]
})
hs_redirect_url = self.cas_service_url + "/_matrix/client/api/v1/login/cas/ticket"
service_param = urllib.urlencode({
"service": "%s?%s" % (hs_redirect_url, client_redirect_url_param)
})
request.redirect("%s/login?%s" % (self.cas_server_url, service_param))
finish_request(request)
class CasTicketServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login/cas/ticket", releases=())
def __init__(self, hs):
super(CasTicketServlet, self).__init__(hs)
self.cas_server_url = hs.config.cas_server_url
self.cas_service_url = hs.config.cas_service_url
self.cas_required_attributes = hs.config.cas_required_attributes
self.auth_handler = hs.get_auth_handler()
self.handlers = hs.get_handlers()
self.macaroon_gen = hs.get_macaroon_generator()
@defer.inlineCallbacks
def on_GET(self, request):
client_redirect_url = request.args["redirectUrl"][0]
http_client = self.hs.get_simple_http_client()
uri = self.cas_server_url + "/proxyValidate"
args = {
"ticket": request.args["ticket"],
"service": self.cas_service_url
}
try:
body = yield http_client.get_raw(uri, args)
except PartialDownloadError as pde:
# Twisted raises this error if the connection is closed,
# even if that's being used old-http style to signal end-of-data
body = pde.response
result = yield self.handle_cas_response(request, body, client_redirect_url)
defer.returnValue(result)
@defer.inlineCallbacks
def handle_cas_response(self, request, cas_response_body, client_redirect_url):
user, attributes = self.parse_cas_response(cas_response_body)
for required_attribute, required_value in self.cas_required_attributes.items():
# If required attribute was not in CAS Response - Forbidden
if required_attribute not in attributes:
raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
# Also need to check value
if required_value is not None:
actual_value = attributes[required_attribute]
# If required attribute value does not match expected - Forbidden
if required_value != actual_value:
raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
user_id = UserID(user, self.hs.hostname).to_string()
auth_handler = self.auth_handler
registered_user_id = yield auth_handler.check_user_exists(user_id)
if not registered_user_id:
registered_user_id, _ = (
yield self.handlers.registration_handler.register(localpart=user)
)
login_token = self.macaroon_gen.generate_short_term_login_token(
registered_user_id
)
redirect_url = self.add_login_token_to_redirect_url(client_redirect_url,
login_token)
request.redirect(redirect_url)
finish_request(request)
def add_login_token_to_redirect_url(self, url, token):
url_parts = list(urlparse.urlparse(url))
query = dict(urlparse.parse_qsl(url_parts[4]))
query.update({"loginToken": token})
url_parts[4] = urllib.urlencode(query)
return urlparse.urlunparse(url_parts)
def parse_cas_response(self, cas_response_body):
user = None
attributes = {}
try:
root = ET.fromstring(cas_response_body)
if not root.tag.endswith("serviceResponse"):
raise Exception("root of CAS response is not serviceResponse")
success = (root[0].tag.endswith("authenticationSuccess"))
for child in root[0]:
if child.tag.endswith("user"):
user = child.text
if child.tag.endswith("attributes"):
for attribute in child:
# ElementTree library expands the namespace in
# attribute tags to the full URL of the namespace.
# We don't care about namespace here and it will always
# be encased in curly braces, so we remove them.
tag = attribute.tag
if "}" in tag:
tag = tag.split("}")[1]
attributes[tag] = attribute.text
if user is None:
raise Exception("CAS response does not contain user")
except Exception:
logger.error("Error parsing CAS response", exc_info=1)
raise LoginError(401, "Invalid CAS response",
errcode=Codes.UNAUTHORIZED)
if not success:
raise LoginError(401, "Unsuccessful CAS response",
errcode=Codes.UNAUTHORIZED)
return user, attributes
def register_servlets(hs, http_server):
LoginRestServlet(hs).register(http_server)
if hs.config.saml2_enabled:
SAML2RestServlet(hs).register(http_server)
if hs.config.cas_enabled:
CasRedirectServlet(hs).register(http_server)
CasTicketServlet(hs).register(http_server)