Matrix-Mirrors/synapse-product
1
0
Fork 0
mirror of https://git.anonymousland.org/anonymousland/synapse-product.git synced 2024-12-11 03:24:21 -05:00
Code Issues Packages Projects Releases Wiki Activity

Record mappings from saml users in an external table

Browse Source 
We want to assign unique mxids to saml users based on an incrementing
suffix. For that to work, we need to record the allocated mxid in a separate
table.
This commit is contained in:
Richard van der Hoff 2019-09-13 15:20:49 +01:00
parent 785cbd3999
commit a8ac40445c
6 changed files with 276 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
docs/sample_config.yaml
View File

@ -1099,6 +1099,32 @@ saml2_config:
#
#saml_session_lifetime: 5m
# The SAML attribute (after mapping via the attribute maps) to use to derive
# the Matrix ID from. 'uid' by default.
#
#mxid_source_attribute: displayName
# The mapping system to use for mapping the saml attribute onto a matrix ID.
# Options include:
# * 'hexencode' (which maps unpermitted characters to '=xx')
# * 'dotreplace' (which replaces unpermitted characters with '.').
# The default is 'hexencode'.
#
#mxid_mapping: dotreplace
# In previous versions of synapse, the mapping from SAML attribute to MXID was
# always calculated dynamically rather than stored in a table. For backwards-
# compatibility, we will look for user_ids matching such a pattern before
# creating a new account.
#
# This setting controls the SAML attribute which will be used for this
# backwards-compatibility lookup. Typically it should be 'uid', but if the
# attribute maps are changed, it may be necessary to change it.
#
# The default is 'uid'.
#
#grandfathered_mxid_source_attribute: upn
# Enable CAS for registration and login.

78
synapse/config/saml2_config.py
View File

@ -12,7 +12,13 @@
# 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 re
from synapse.python_dependencies import DependencyException, check_requirements
from synapse.types import (
map_username_to_mxid_localpart,
mxid_localpart_allowed_characters,
)
from ._base import Config, ConfigError
@ -36,6 +42,14 @@ class SAML2Config(Config):
self.saml2_enabled = True
self.saml2_mxid_source_attribute = saml2_config.get(
"mxid_source_attribute", "uid"
)
self.saml2_grandfathered_mxid_source_attribute = saml2_config.get(
"grandfathered_mxid_source_attribute", "uid"
)
import saml2.config
self.saml2_sp_config = saml2.config.SPConfig()
@ -51,6 +65,12 @@ class SAML2Config(Config):
saml2_config.get("saml_session_lifetime", "5m")
)
mapping = saml2_config.get("mxid_mapping", "hexencode")
try:
self.saml2_mxid_mapper = MXID_MAPPER_MAP[mapping]
except KeyError:
raise ConfigError("%s is not a known mxid_mapping" % (mapping,))
def _default_saml_config_dict(self):
import saml2
@ -58,6 +78,13 @@ class SAML2Config(Config):
if public_baseurl is None:
raise ConfigError("saml2_config requires a public_baseurl to be set")
required_attributes = {"uid", self.saml2_mxid_source_attribute}
optional_attributes = {"displayName"}
if self.saml2_grandfathered_mxid_source_attribute:
optional_attributes.add(self.saml2_grandfathered_mxid_source_attribute)
optional_attributes -= required_attributes
metadata_url = public_baseurl + "_matrix/saml2/metadata.xml"
response_url = public_baseurl + "_matrix/saml2/authn_response"
return {
@ -69,8 +96,9 @@ class SAML2Config(Config):
(response_url, saml2.BINDING_HTTP_POST)
]
},
"required_attributes": ["uid"],
"optional_attributes": ["mail", "surname", "givenname"],
"required_attributes": list(required_attributes),
"optional_attributes": list(optional_attributes),
# "name_id_format": saml2.saml.NAMEID_FORMAT_PERSISTENT,
}
},
}
@ -146,6 +174,52 @@ class SAML2Config(Config):
# The default is 5 minutes.
#
#saml_session_lifetime: 5m
# The SAML attribute (after mapping via the attribute maps) to use to derive
# the Matrix ID from. 'uid' by default.
#
#mxid_source_attribute: displayName
# The mapping system to use for mapping the saml attribute onto a matrix ID.
# Options include:
# * 'hexencode' (which maps unpermitted characters to '=xx')
# * 'dotreplace' (which replaces unpermitted characters with '.').
# The default is 'hexencode'.
#
#mxid_mapping: dotreplace
# In previous versions of synapse, the mapping from SAML attribute to MXID was
# always calculated dynamically rather than stored in a table. For backwards-
# compatibility, we will look for user_ids matching such a pattern before
# creating a new account.
#
# This setting controls the SAML attribute which will be used for this
# backwards-compatibility lookup. Typically it should be 'uid', but if the
# attribute maps are changed, it may be necessary to change it.
#
# The default is 'uid'.
#
#grandfathered_mxid_source_attribute: upn
""" % {
"config_dir_path": config_dir_path
}
DOT_REPLACE_PATTERN = re.compile(
("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),))
)
def dot_replace_for_mxid(username: str) -> str:
username = username.lower()
username = DOT_REPLACE_PATTERN.sub(".", username)
# regular mxids aren't allowed to start with an underscore either
username = re.sub("^_", "", username)
return username
MXID_MAPPER_MAP = {
"hexencode": map_username_to_mxid_localpart,
"dotreplace": dot_replace_for_mxid,
}

101
synapse/handlers/saml_handler.py
View File

@ -21,6 +21,8 @@ from saml2.client import Saml2Client
from synapse.api.errors import SynapseError
from synapse.http.servlet import parse_string
from synapse.rest.client.v1.login import SSOAuthHandler
from synapse.types import UserID, map_username_to_mxid_localpart
from synapse.util.async_helpers import Linearizer
logger = logging.getLogger(__name__)
@ -29,12 +31,26 @@ class SamlHandler:
def __init__(self, hs):
self._saml_client = Saml2Client(hs.config.saml2_sp_config)
self._sso_auth_handler = SSOAuthHandler(hs)
self._registration_handler = hs.get_registration_handler()
self._clock = hs.get_clock()
self._datastore = hs.get_datastore()
self._hostname = hs.hostname
self._saml2_session_lifetime = hs.config.saml2_session_lifetime
self._mxid_source_attribute = hs.config.saml2_mxid_source_attribute
self._grandfathered_mxid_source_attribute = (
hs.config.saml2_grandfathered_mxid_source_attribute
)
self._mxid_mapper = hs.config.saml2_mxid_mapper
# identifier for the external_ids table
self._auth_provider_id = "saml"
# a map from saml session id to Saml2SessionData object
self._outstanding_requests_dict = {}
self._clock = hs.get_clock()
self._saml2_session_lifetime = hs.config.saml2_session_lifetime
# a lock on the mappings
self._mapping_lock = Linearizer(name="saml_mapping", clock=self._clock)
def handle_redirect_request(self, client_redirect_url):
"""Handle an incoming request to /login/sso/redirect
@ -60,7 +76,7 @@ class SamlHandler:
# this shouldn't happen!
raise Exception("prepare_for_authenticate didn't return a Location header")
def handle_saml_response(self, request):
async def handle_saml_response(self, request):
"""Handle an incoming request to /_matrix/saml2/authn_response
Args:
@ -77,6 +93,10 @@ class SamlHandler:
# the dict.
self.expire_sessions()
user_id = await self._map_saml_response_to_user(resp_bytes)
self._sso_auth_handler.complete_sso_login(user_id, request, relay_state)
async def _map_saml_response_to_user(self, resp_bytes):
try:
saml2_auth = self._saml_client.parse_authn_request_response(
resp_bytes,
@ -91,18 +111,85 @@ class SamlHandler:
logger.warning("SAML2 response was not signed")
raise SynapseError(400, "SAML2 response was not signed")
if "uid" not in saml2_auth.ava:
try:
remote_user_id = saml2_auth.ava["uid"][0]
except KeyError:
logger.warning("SAML2 response lacks a 'uid' attestation")
raise SynapseError(400, "uid not in SAML2 response")
try:
mxid_source = saml2_auth.ava[self._mxid_source_attribute][0]
except KeyError:
logger.warning(
"SAML2 response lacks a '%s' attestation", self._mxid_source_attribute
)
raise SynapseError(
400, "%s not in SAML2 response" % (self._mxid_source_attribute,)
)
self._outstanding_requests_dict.pop(saml2_auth.in_response_to, None)
username = saml2_auth.ava["uid"][0]
displayName = saml2_auth.ava.get("displayName", [None])[0]
return self._sso_auth_handler.on_successful_auth(
username, request, relay_state, user_display_name=displayName
with (await self._mapping_lock.queue(self._auth_provider_id)):
# first of all, check if we already have a mapping for this user
logger.info(
"Looking for existing mapping for user %s:%s",
self._auth_provider_id,
remote_user_id,
)
registered_user_id = await self._datastore.get_user_by_external_id(
self._auth_provider_id, remote_user_id
)
if registered_user_id is not None:
logger.info("Found existing mapping %s", registered_user_id)
return registered_user_id
# backwards-compatibility hack: see if there is an existing user with a
# suitable mapping from the uid
if (
self._grandfathered_mxid_source_attribute
and self._grandfathered_mxid_source_attribute in saml2_auth.ava
):
attrval = saml2_auth.ava[self._grandfathered_mxid_source_attribute][0]
user_id = UserID(
map_username_to_mxid_localpart(attrval), self._hostname
).to_string()
logger.info(
"Looking for existing account based on mapped %s %s",
self._grandfathered_mxid_source_attribute,
user_id,
)
users = await self._datastore.get_users_by_id_case_insensitive(user_id)
if users:
registered_user_id = list(users.keys())[0]
logger.info("Grandfathering mapping to %s", registered_user_id)
await self._datastore.record_user_external_id(
self._auth_provider_id, remote_user_id, registered_user_id
)
return registered_user_id
# figure out a new mxid for this user
base_mxid_localpart = self._mxid_mapper(mxid_source)
suffix = 0
while True:
localpart = base_mxid_localpart + (str(suffix) if suffix else "")
if not await self._datastore.get_users_by_id_case_insensitive(
UserID(localpart, self._hostname).to_string()
):
break
suffix += 1
logger.info("Allocating mxid for new user with localpart %s", localpart)
registered_user_id = await self._registration_handler.register_user(
localpart=localpart, default_display_name=displayName
)
await self._datastore.record_user_external_id(
self._auth_provider_id, remote_user_id, registered_user_id
)
return registered_user_id
def expire_sessions(self):
expire_before = self._clock.time_msec() - self._saml2_session_lifetime

14
synapse/rest/client/v1/login.py
View File

@ -29,6 +29,7 @@ from synapse.http.servlet import (
parse_json_object_from_request,
parse_string,
)
from synapse.http.site import SynapseRequest
from synapse.rest.client.v2_alpha._base import client_patterns
from synapse.rest.well_known import WellKnownBuilder
from synapse.types import UserID, map_username_to_mxid_localpart
@ -507,6 +508,19 @@ class SSOAuthHandler(object):
localpart=localpart, default_display_name=user_display_name
)
self.complete_sso_login(registered_user_id, request, client_redirect_url)
def complete_sso_login(
self, registered_user_id: str, request: SynapseRequest, client_redirect_url: str
):
"""Having figured out a mxid for this user, complete the HTTP request
Args:
registered_user_id:
request:
client_redirect_url:
"""
login_token = self._macaroon_gen.generate_short_term_login_token(
registered_user_id
)

41
synapse/storage/registration.py
View File

@ -22,6 +22,7 @@ from six import iterkeys
from six.moves import range
from twisted.internet import defer
from twisted.internet.defer import Deferred
from synapse.api.constants import UserTypes
from synapse.api.errors import Codes, StoreError, ThreepidValidationError
@ -337,6 +338,26 @@ class RegistrationWorkerStore(SQLBaseStore):
return self.runInteraction("get_users_by_id_case_insensitive", f)
async def get_user_by_external_id(
self, auth_provider: str, external_id: str
) -> str:
"""Look up a user by their external auth id
Args:
auth_provider: identifier for the remote auth provider
external_id: id on that system
Returns:
str|None: the mxid of the user, or None if they are not known
"""
return await self._simple_select_one_onecol(
table="user_external_ids",
keyvalues={"auth_provider": auth_provider, "external_id": external_id},
retcol="user_id",
allow_none=True,
desc="get_user_by_external_id",
)
@defer.inlineCallbacks
def count_all_users(self):
"""Counts all users registered on the homeserver."""
@ -848,6 +869,26 @@ class RegistrationStore(
self._invalidate_cache_and_stream(txn, self.get_user_by_id, (user_id,))
txn.call_after(self.is_guest.invalidate, (user_id,))
def record_user_external_id(
self, auth_provider: str, external_id: str, user_id: str
) -> Deferred:
"""Record a mapping from an external user id to a mxid
Args:
auth_provider: identifier for the remote auth provider
external_id: id on that system
user_id: complete mxid that it is mapped to
"""
return self._simple_insert(
table="user_external_ids",
values={
"auth_provider": auth_provider,
"external_id": external_id,
"user_id": user_id,
},
desc="record_user_external_id",
)
def user_set_password_hash(self, user_id, password_hash):
"""
NB. This does *not* evict any cache because the one use for this

24
synapse/storage/schema/delta/56/user_external_ids.sql Normal file
View File

@ -0,0 +1,24 @@
/* Copyright 2019 The Matrix.org Foundation C.I.C.
*
* 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.
*/
/*
* a table which records mappings from external auth providers to mxids
*/
CREATE TABLE IF NOT EXISTS user_external_ids (
auth_provider TEXT NOT NULL,
external_id TEXT NOT NULL,
user_id TEXT NOT NULL,
UNIQUE (auth_provider, external_id)
);