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Admin API for creating new users (#3415)

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Amber Brown 2018-07-20 22:41:13 +10:00 committed by GitHub
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8 changed files with 569 additions and 3 deletions
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0
changelog.d/3415.misc Normal file
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63
docs/admin_api/register_api.rst Normal file
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@ -0,0 +1,63 @@
Shared-Secret Registration
==========================
This API allows for the creation of users in an administrative and
non-interactive way. This is generally used for bootstrapping a Synapse
instance with administrator accounts.
To authenticate yourself to the server, you will need both the shared secret
(``registration_shared_secret`` in the homeserver configuration), and a
one-time nonce. If the registration shared secret is not configured, this API
is not enabled.
To fetch the nonce, you need to request one from the API::
> GET /_matrix/client/r0/admin/register
< {"nonce": "thisisanonce"}
Once you have the nonce, you can make a ``POST`` to the same URL with a JSON
body containing the nonce, username, password, whether they are an admin
(optional, False by default), and a HMAC digest of the content.
As an example::
> POST /_matrix/client/r0/admin/register
> {
"nonce": "thisisanonce",
"username": "pepper_roni",
"password": "pizza",
"admin": true,
"mac": "mac_digest_here"
}
< {
"access_token": "token_here",
"user_id": "@pepper_roni@test",
"home_server": "test",
"device_id": "device_id_here"
}
The MAC is the hex digest output of the HMAC-SHA1 algorithm, with the key being
the shared secret and the content being the nonce, user, password, and either
the string "admin" or "notadmin", each separated by NULs. For an example of
generation in Python::
import hmac, hashlib
def generate_mac(nonce, user, password, admin=False):
mac = hmac.new(
key=shared_secret,
digestmod=hashlib.sha1,
)
mac.update(nonce.encode('utf8'))
mac.update(b"\x00")
mac.update(user.encode('utf8'))
mac.update(b"\x00")
mac.update(password.encode('utf8'))
mac.update(b"\x00")
mac.update(b"admin" if admin else b"notadmin")
return mac.hexdigest()

32
scripts/register_new_matrix_user
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@ -26,11 +26,37 @@ import yaml
def request_registration(user, password, server_location, shared_secret, admin=False):
req = urllib2.Request(
"%s/_matrix/client/r0/admin/register" % (server_location,),
headers={'Content-Type': 'application/json'}
)
try:
if sys.version_info[:3] >= (2, 7, 9):
# As of version 2.7.9, urllib2 now checks SSL certs
import ssl
f = urllib2.urlopen(req, context=ssl.SSLContext(ssl.PROTOCOL_SSLv23))
else:
f = urllib2.urlopen(req)
body = f.read()
f.close()
nonce = json.loads(body)["nonce"]
except urllib2.HTTPError as e:
print "ERROR! Received %d %s" % (e.code, e.reason,)
if 400 <= e.code < 500:
if e.info().type == "application/json":
resp = json.load(e)
if "error" in resp:
print resp["error"]
sys.exit(1)
mac = hmac.new(
key=shared_secret,
digestmod=hashlib.sha1,
)
mac.update(nonce)
mac.update("\x00")
mac.update(user)
mac.update("\x00")
mac.update(password)
@ -40,10 +66,10 @@ def request_registration(user, password, server_location, shared_secret, admin=F
mac = mac.hexdigest()
data = {
"user": user,
"nonce": nonce,
"username": user,
"password": password,
"mac": mac,
"type": "org.matrix.login.shared_secret",
"admin": admin,
}
@ -52,7 +78,7 @@ def request_registration(user, password, server_location, shared_secret, admin=F
print "Sending registration request..."
req = urllib2.Request(
"%s/_matrix/client/api/v1/register" % (server_location,),
"%s/_matrix/client/r0/admin/register" % (server_location,),
data=json.dumps(data),
headers={'Content-Type': 'application/json'}
)

122
synapse/rest/client/v1/admin.py
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@ -14,6 +14,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import hashlib
import hmac
import logging
from six.moves import http_client
@ -63,6 +65,125 @@ class UsersRestServlet(ClientV1RestServlet):
defer.returnValue((200, ret))
class UserRegisterServlet(ClientV1RestServlet):
"""
Attributes:
NONCE_TIMEOUT (int): Seconds until a generated nonce won't be accepted
nonces (dict[str, int]): The nonces that we will accept. A dict of
nonce to the time it was generated, in int seconds.
"""
PATTERNS = client_path_patterns("/admin/register")
NONCE_TIMEOUT = 60
def __init__(self, hs):
super(UserRegisterServlet, self).__init__(hs)
self.handlers = hs.get_handlers()
self.reactor = hs.get_reactor()
self.nonces = {}
self.hs = hs
def _clear_old_nonces(self):
"""
Clear out old nonces that are older than NONCE_TIMEOUT.
"""
now = int(self.reactor.seconds())
for k, v in list(self.nonces.items()):
if now - v > self.NONCE_TIMEOUT:
del self.nonces[k]
def on_GET(self, request):
"""
Generate a new nonce.
"""
self._clear_old_nonces()
nonce = self.hs.get_secrets().token_hex(64)
self.nonces[nonce] = int(self.reactor.seconds())
return (200, {"nonce": nonce.encode('ascii')})
@defer.inlineCallbacks
def on_POST(self, request):
self._clear_old_nonces()
if not self.hs.config.registration_shared_secret:
raise SynapseError(400, "Shared secret registration is not enabled")
body = parse_json_object_from_request(request)
if "nonce" not in body:
raise SynapseError(
400, "nonce must be specified", errcode=Codes.BAD_JSON,
)
nonce = body["nonce"]
if nonce not in self.nonces:
raise SynapseError(
400, "unrecognised nonce",
)
# Delete the nonce, so it can't be reused, even if it's invalid
del self.nonces[nonce]
if "username" not in body:
raise SynapseError(
400, "username must be specified", errcode=Codes.BAD_JSON,
)
else:
if (not isinstance(body['username'], str) or len(body['username']) > 512):
raise SynapseError(400, "Invalid username")
username = body["username"].encode("utf-8")
if b"\x00" in username:
raise SynapseError(400, "Invalid username")
if "password" not in body:
raise SynapseError(
400, "password must be specified", errcode=Codes.BAD_JSON,
)
else:
if (not isinstance(body['password'], str) or len(body['password']) > 512):
raise SynapseError(400, "Invalid password")
password = body["password"].encode("utf-8")
if b"\x00" in password:
raise SynapseError(400, "Invalid password")
admin = body.get("admin", None)
got_mac = body["mac"]
want_mac = hmac.new(
key=self.hs.config.registration_shared_secret.encode(),
digestmod=hashlib.sha1,
)
want_mac.update(nonce)
want_mac.update(b"\x00")
want_mac.update(username)
want_mac.update(b"\x00")
want_mac.update(password)
want_mac.update(b"\x00")
want_mac.update(b"admin" if admin else b"notadmin")
want_mac = want_mac.hexdigest()
if not hmac.compare_digest(want_mac, got_mac):
raise SynapseError(
403, "HMAC incorrect",
)
# Reuse the parts of RegisterRestServlet to reduce code duplication
from synapse.rest.client.v2_alpha.register import RegisterRestServlet
register = RegisterRestServlet(self.hs)
(user_id, _) = yield register.registration_handler.register(
localpart=username.lower(), password=password, admin=bool(admin),
generate_token=False,
)
result = yield register._create_registration_details(user_id, body)
defer.returnValue((200, result))
class WhoisRestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/admin/whois/(?P<user_id>[^/]*)")
@ -614,3 +735,4 @@ def register_servlets(hs, http_server):
ShutdownRoomRestServlet(hs).register(http_server)
QuarantineMediaInRoom(hs).register(http_server)
ListMediaInRoom(hs).register(http_server)
UserRegisterServlet(hs).register(http_server)

42
synapse/secrets.py Normal file
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@ -0,0 +1,42 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector 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.
"""
Injectable secrets module for Synapse.
See https://docs.python.org/3/library/secrets.html#module-secrets for the API
used in Python 3.6, and the API emulated in Python 2.7.
"""
import six
if six.PY3:
import secrets
def Secrets():
return secrets
else:
import os
import binascii
class Secrets(object):
def token_bytes(self, nbytes=32):
return os.urandom(nbytes)
def token_hex(self, nbytes=32):
return binascii.hexlify(self.token_bytes(nbytes))

5
synapse/server.py
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@ -74,6 +74,7 @@ from synapse.rest.media.v1.media_repository import (
MediaRepository,
MediaRepositoryResource,
)
from synapse.secrets import Secrets
from synapse.server_notices.server_notices_manager import ServerNoticesManager
from synapse.server_notices.server_notices_sender import ServerNoticesSender
from synapse.server_notices.worker_server_notices_sender import WorkerServerNoticesSender
@ -158,6 +159,7 @@ class HomeServer(object):
'groups_server_handler',
'groups_attestation_signing',
'groups_attestation_renewer',
'secrets',
'spam_checker',
'room_member_handler',
'federation_registry',
@ -405,6 +407,9 @@ class HomeServer(object):
def build_groups_attestation_renewer(self):
return GroupAttestionRenewer(self)
def build_secrets(self):
return Secrets()
def build_spam_checker(self):
return SpamChecker(self)

305
tests/rest/client/v1/test_admin.py Normal file
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@ -0,0 +1,305 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector 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.
import hashlib
import hmac
import json
from mock import Mock
from synapse.http.server import JsonResource
from synapse.rest.client.v1.admin import register_servlets
from synapse.util import Clock
from tests import unittest
from tests.server import (
ThreadedMemoryReactorClock,
make_request,
render,
setup_test_homeserver,
)
class UserRegisterTestCase(unittest.TestCase):
def setUp(self):
self.clock = ThreadedMemoryReactorClock()
self.hs_clock = Clock(self.clock)
self.url = "/_matrix/client/r0/admin/register"
self.registration_handler = Mock()
self.identity_handler = Mock()
self.login_handler = Mock()
self.device_handler = Mock()
self.device_handler.check_device_registered = Mock(return_value="FAKE")
self.datastore = Mock(return_value=Mock())
self.datastore.get_current_state_deltas = Mock(return_value=[])
self.secrets = Mock()
self.hs = setup_test_homeserver(
http_client=None, clock=self.hs_clock, reactor=self.clock
)
self.hs.config.registration_shared_secret = u"shared"
self.hs.get_media_repository = Mock()
self.hs.get_deactivate_account_handler = Mock()
self.resource = JsonResource(self.hs)
register_servlets(self.hs, self.resource)
def test_disabled(self):
"""
If there is no shared secret, registration through this method will be
prevented.
"""
self.hs.config.registration_shared_secret = None
request, channel = make_request("POST", self.url, b'{}')
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual(
'Shared secret registration is not enabled', channel.json_body["error"]
)
def test_get_nonce(self):
"""
Calling GET on the endpoint will return a randomised nonce, using the
homeserver's secrets provider.
"""
secrets = Mock()
secrets.token_hex = Mock(return_value="abcd")
self.hs.get_secrets = Mock(return_value=secrets)
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
self.assertEqual(channel.json_body, {"nonce": "abcd"})
def test_expired_nonce(self):
"""
Calling GET on the endpoint will return a randomised nonce, which will
only last for SALT_TIMEOUT (60s).
"""
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
nonce = channel.json_body["nonce"]
# 59 seconds
self.clock.advance(59)
body = json.dumps({"nonce": nonce})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('username must be specified', channel.json_body["error"])
# 61 seconds
self.clock.advance(2)
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('unrecognised nonce', channel.json_body["error"])
def test_register_incorrect_nonce(self):
"""
Only the provided nonce can be used, as it's checked in the MAC.
"""
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
nonce = channel.json_body["nonce"]
want_mac = hmac.new(key=b"shared", digestmod=hashlib.sha1)
want_mac.update(b"notthenonce\x00bob\x00abc123\x00admin")
want_mac = want_mac.hexdigest()
body = json.dumps(
{
"nonce": nonce,
"username": "bob",
"password": "abc123",
"admin": True,
"mac": want_mac,
}
).encode('utf8')
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(403, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual("HMAC incorrect", channel.json_body["error"])
def test_register_correct_nonce(self):
"""
When the correct nonce is provided, and the right key is provided, the
user is registered.
"""
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
nonce = channel.json_body["nonce"]
want_mac = hmac.new(key=b"shared", digestmod=hashlib.sha1)
want_mac.update(nonce.encode('ascii') + b"\x00bob\x00abc123\x00admin")
want_mac = want_mac.hexdigest()
body = json.dumps(
{
"nonce": nonce,
"username": "bob",
"password": "abc123",
"admin": True,
"mac": want_mac,
}
).encode('utf8')
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual("@bob:test", channel.json_body["user_id"])
def test_nonce_reuse(self):
"""
A valid unrecognised nonce.
"""
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
nonce = channel.json_body["nonce"]
want_mac = hmac.new(key=b"shared", digestmod=hashlib.sha1)
want_mac.update(nonce.encode('ascii') + b"\x00bob\x00abc123\x00admin")
want_mac = want_mac.hexdigest()
body = json.dumps(
{
"nonce": nonce,
"username": "bob",
"password": "abc123",
"admin": True,
"mac": want_mac,
}
).encode('utf8')
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual("@bob:test", channel.json_body["user_id"])
# Now, try and reuse it
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('unrecognised nonce', channel.json_body["error"])
def test_missing_parts(self):
"""
Synapse will complain if you don't give nonce, username, password, and
mac. Admin is optional. Additional checks are done for length and
type.
"""
def nonce():
request, channel = make_request("GET", self.url)
render(request, self.resource, self.clock)
return channel.json_body["nonce"]
#
# Nonce check
#
# Must be present
body = json.dumps({})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('nonce must be specified', channel.json_body["error"])
#
# Username checks
#
# Must be present
body = json.dumps({"nonce": nonce()})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('username must be specified', channel.json_body["error"])
# Must be a string
body = json.dumps({"nonce": nonce(), "username": 1234})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid username', channel.json_body["error"])
# Must not have null bytes
body = json.dumps({"nonce": nonce(), "username": b"abcd\x00"})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid username', channel.json_body["error"])
# Must not have null bytes
body = json.dumps({"nonce": nonce(), "username": "a" * 1000})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid username', channel.json_body["error"])
#
# Username checks
#
# Must be present
body = json.dumps({"nonce": nonce(), "username": "a"})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('password must be specified', channel.json_body["error"])
# Must be a string
body = json.dumps({"nonce": nonce(), "username": "a", "password": 1234})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid password', channel.json_body["error"])
# Must not have null bytes
body = json.dumps({"nonce": nonce(), "username": "a", "password": b"abcd\x00"})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid password', channel.json_body["error"])
# Super long
body = json.dumps({"nonce": nonce(), "username": "a", "password": "A" * 1000})
request, channel = make_request("POST", self.url, body.encode('utf8'))
render(request, self.resource, self.clock)
self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual('Invalid password', channel.json_body["error"])

3
tests/utils.py
View File

@ -71,6 +71,8 @@ def setup_test_homeserver(name="test", datastore=None, config=None, reactor=None
config.user_directory_search_all_users = False
config.user_consent_server_notice_content = None
config.block_events_without_consent_error = None
config.media_storage_providers = []
config.auto_join_rooms = []
# disable user directory updates, because they get done in the
# background, which upsets the test runner.
@ -136,6 +138,7 @@ def setup_test_homeserver(name="test", datastore=None, config=None, reactor=None
database_engine=db_engine,
room_list_handler=object(),
tls_server_context_factory=Mock(),
reactor=reactor,
**kargs
)