413 lines
16 KiB
Python
413 lines
16 KiB
Python
# Copyright 2020 Quentin Gliech
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# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from collections import Counter
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from typing import Any, Collection, Iterable, List, Mapping, Optional, Tuple, Type
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import attr
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from synapse.config._util import validate_config
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from synapse.config.sso import SsoAttributeRequirement
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from synapse.types import JsonDict
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from synapse.util.module_loader import load_module
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from synapse.util.stringutils import parse_and_validate_mxc_uri
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from ..util.check_dependencies import check_requirements
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from ._base import Config, ConfigError, read_file
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DEFAULT_USER_MAPPING_PROVIDER = "synapse.handlers.oidc.JinjaOidcMappingProvider"
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# The module that JinjaOidcMappingProvider is in was renamed, we want to
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# transparently handle both the same.
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LEGACY_USER_MAPPING_PROVIDER = "synapse.handlers.oidc_handler.JinjaOidcMappingProvider"
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class OIDCConfig(Config):
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section = "oidc"
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def read_config(self, config: JsonDict, **kwargs: Any) -> None:
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self.oidc_providers = tuple(_parse_oidc_provider_configs(config))
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if not self.oidc_providers:
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return
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check_requirements("oidc")
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# check we don't have any duplicate idp_ids now. (The SSO handler will also
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# check for duplicates when the REST listeners get registered, but that happens
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# after synapse has forked so doesn't give nice errors.)
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c = Counter([i.idp_id for i in self.oidc_providers])
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for idp_id, count in c.items():
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if count > 1:
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raise ConfigError(
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"Multiple OIDC providers have the idp_id %r." % idp_id
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)
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public_baseurl = self.root.server.public_baseurl
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self.oidc_callback_url = public_baseurl + "_synapse/client/oidc/callback"
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@property
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def oidc_enabled(self) -> bool:
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# OIDC is enabled if we have a provider
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return bool(self.oidc_providers)
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# jsonschema definition of the configuration settings for an oidc identity provider
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OIDC_PROVIDER_CONFIG_SCHEMA = {
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"type": "object",
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"required": ["issuer", "client_id"],
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"properties": {
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"idp_id": {
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"type": "string",
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"minLength": 1,
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# MSC2858 allows a maxlen of 255, but we prefix with "oidc-"
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"maxLength": 250,
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"pattern": "^[A-Za-z0-9._~-]+$",
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},
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"idp_name": {"type": "string"},
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"idp_icon": {"type": "string"},
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"idp_brand": {
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"type": "string",
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"minLength": 1,
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"maxLength": 255,
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"pattern": "^[a-z][a-z0-9_.-]*$",
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},
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"discover": {"type": "boolean"},
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"issuer": {"type": "string"},
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"client_id": {"type": "string"},
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"client_secret": {"type": "string"},
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"client_secret_jwt_key": {
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"type": "object",
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"required": ["jwt_header"],
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"oneOf": [
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{"required": ["key"]},
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{"required": ["key_file"]},
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],
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"properties": {
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"key": {"type": "string"},
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"key_file": {"type": "string"},
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"jwt_header": {
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"type": "object",
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"required": ["alg"],
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"properties": {
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"alg": {"type": "string"},
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},
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"additionalProperties": {"type": "string"},
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},
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"jwt_payload": {
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"type": "object",
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"additionalProperties": {"type": "string"},
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},
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},
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},
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"client_auth_method": {
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"type": "string",
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# the following list is the same as the keys of
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# authlib.oauth2.auth.ClientAuth.DEFAULT_AUTH_METHODS. We inline it
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# to avoid importing authlib here.
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"enum": ["client_secret_basic", "client_secret_post", "none"],
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},
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"pkce_method": {"type": "string", "enum": ["auto", "always", "never"]},
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"scopes": {"type": "array", "items": {"type": "string"}},
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"authorization_endpoint": {"type": "string"},
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"token_endpoint": {"type": "string"},
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"userinfo_endpoint": {"type": "string"},
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"jwks_uri": {"type": "string"},
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"skip_verification": {"type": "boolean"},
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"backchannel_logout_enabled": {"type": "boolean"},
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"backchannel_logout_ignore_sub": {"type": "boolean"},
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"user_profile_method": {
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"type": "string",
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"enum": ["auto", "userinfo_endpoint"],
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},
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"allow_existing_users": {"type": "boolean"},
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"user_mapping_provider": {"type": ["object", "null"]},
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"attribute_requirements": {
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"type": "array",
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"items": SsoAttributeRequirement.JSON_SCHEMA,
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},
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"enable_registration": {"type": "boolean"},
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},
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}
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# the same as OIDC_PROVIDER_CONFIG_SCHEMA, but with compulsory idp_id and idp_name
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OIDC_PROVIDER_CONFIG_WITH_ID_SCHEMA = {
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"allOf": [OIDC_PROVIDER_CONFIG_SCHEMA, {"required": ["idp_id", "idp_name"]}]
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}
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# the `oidc_providers` list can either be None (as it is in the default config), or
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# a list of provider configs, each of which requires an explicit ID and name.
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OIDC_PROVIDER_LIST_SCHEMA = {
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"oneOf": [
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{"type": "null"},
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{"type": "array", "items": OIDC_PROVIDER_CONFIG_WITH_ID_SCHEMA},
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]
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}
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# the `oidc_config` setting can either be None (which it used to be in the default
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# config), or an object. If an object, it is ignored unless it has an "enabled: True"
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# property.
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#
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# It's *possible* to represent this with jsonschema, but the resultant errors aren't
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# particularly clear, so we just check for either an object or a null here, and do
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# additional checks in the code.
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OIDC_CONFIG_SCHEMA = {"oneOf": [{"type": "null"}, {"type": "object"}]}
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# the top-level schema can contain an "oidc_config" and/or an "oidc_providers".
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MAIN_CONFIG_SCHEMA = {
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"type": "object",
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"properties": {
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"oidc_config": OIDC_CONFIG_SCHEMA,
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"oidc_providers": OIDC_PROVIDER_LIST_SCHEMA,
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},
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}
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def _parse_oidc_provider_configs(config: JsonDict) -> Iterable["OidcProviderConfig"]:
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"""extract and parse the OIDC provider configs from the config dict
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The configuration may contain either a single `oidc_config` object with an
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`enabled: True` property, or a list of provider configurations under
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`oidc_providers`, *or both*.
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Returns a generator which yields the OidcProviderConfig objects
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"""
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validate_config(MAIN_CONFIG_SCHEMA, config, ())
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for i, p in enumerate(config.get("oidc_providers") or []):
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yield _parse_oidc_config_dict(p, ("oidc_providers", "<item %i>" % (i,)))
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# for backwards-compatibility, it is also possible to provide a single "oidc_config"
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# object with an "enabled: True" property.
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oidc_config = config.get("oidc_config")
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if oidc_config and oidc_config.get("enabled", False):
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# MAIN_CONFIG_SCHEMA checks that `oidc_config` is an object, but not that
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# it matches OIDC_PROVIDER_CONFIG_SCHEMA (see the comments on OIDC_CONFIG_SCHEMA
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# above), so now we need to validate it.
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validate_config(OIDC_PROVIDER_CONFIG_SCHEMA, oidc_config, ("oidc_config",))
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yield _parse_oidc_config_dict(oidc_config, ("oidc_config",))
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def _parse_oidc_config_dict(
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oidc_config: JsonDict, config_path: Tuple[str, ...]
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) -> "OidcProviderConfig":
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"""Take the configuration dict and parse it into an OidcProviderConfig
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Raises:
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ConfigError if the configuration is malformed.
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"""
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ump_config = oidc_config.get("user_mapping_provider", {})
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ump_config.setdefault("module", DEFAULT_USER_MAPPING_PROVIDER)
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if ump_config.get("module") == LEGACY_USER_MAPPING_PROVIDER:
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ump_config["module"] = DEFAULT_USER_MAPPING_PROVIDER
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ump_config.setdefault("config", {})
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(
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user_mapping_provider_class,
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user_mapping_provider_config,
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) = load_module(ump_config, config_path + ("user_mapping_provider",))
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# Ensure loaded user mapping module has defined all necessary methods
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required_methods = [
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"get_remote_user_id",
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"map_user_attributes",
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]
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missing_methods = [
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method
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for method in required_methods
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if not hasattr(user_mapping_provider_class, method)
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]
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if missing_methods:
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raise ConfigError(
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"Class %s is missing required "
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"methods: %s"
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% (
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user_mapping_provider_class,
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", ".join(missing_methods),
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),
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config_path + ("user_mapping_provider", "module"),
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)
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idp_id = oidc_config.get("idp_id", "oidc")
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# prefix the given IDP with a prefix specific to the SSO mechanism, to avoid
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# clashes with other mechs (such as SAML, CAS).
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#
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# We allow "oidc" as an exception so that people migrating from old-style
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# "oidc_config" format (which has long used "oidc" as its idp_id) can migrate to
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# a new-style "oidc_providers" entry without changing the idp_id for their provider
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# (and thereby invalidating their user_external_ids data).
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if idp_id != "oidc":
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idp_id = "oidc-" + idp_id
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# MSC2858 also specifies that the idp_icon must be a valid MXC uri
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idp_icon = oidc_config.get("idp_icon")
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if idp_icon is not None:
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try:
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parse_and_validate_mxc_uri(idp_icon)
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except ValueError as e:
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raise ConfigError(
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"idp_icon must be a valid MXC URI", config_path + ("idp_icon",)
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) from e
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client_secret_jwt_key_config = oidc_config.get("client_secret_jwt_key")
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client_secret_jwt_key: Optional[OidcProviderClientSecretJwtKey] = None
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if client_secret_jwt_key_config is not None:
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keyfile = client_secret_jwt_key_config.get("key_file")
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if keyfile:
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key = read_file(keyfile, config_path + ("client_secret_jwt_key",))
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else:
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key = client_secret_jwt_key_config["key"]
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client_secret_jwt_key = OidcProviderClientSecretJwtKey(
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key=key,
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jwt_header=client_secret_jwt_key_config["jwt_header"],
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jwt_payload=client_secret_jwt_key_config.get("jwt_payload", {}),
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)
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# parse attribute_requirements from config (list of dicts) into a list of SsoAttributeRequirement
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attribute_requirements = [
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SsoAttributeRequirement(**x)
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for x in oidc_config.get("attribute_requirements", [])
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]
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return OidcProviderConfig(
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idp_id=idp_id,
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idp_name=oidc_config.get("idp_name", "OIDC"),
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idp_icon=idp_icon,
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idp_brand=oidc_config.get("idp_brand"),
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discover=oidc_config.get("discover", True),
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issuer=oidc_config["issuer"],
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client_id=oidc_config["client_id"],
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client_secret=oidc_config.get("client_secret"),
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client_secret_jwt_key=client_secret_jwt_key,
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client_auth_method=oidc_config.get("client_auth_method", "client_secret_basic"),
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pkce_method=oidc_config.get("pkce_method", "auto"),
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scopes=oidc_config.get("scopes", ["openid"]),
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authorization_endpoint=oidc_config.get("authorization_endpoint"),
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token_endpoint=oidc_config.get("token_endpoint"),
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userinfo_endpoint=oidc_config.get("userinfo_endpoint"),
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jwks_uri=oidc_config.get("jwks_uri"),
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backchannel_logout_enabled=oidc_config.get("backchannel_logout_enabled", False),
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backchannel_logout_ignore_sub=oidc_config.get(
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"backchannel_logout_ignore_sub", False
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),
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skip_verification=oidc_config.get("skip_verification", False),
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user_profile_method=oidc_config.get("user_profile_method", "auto"),
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allow_existing_users=oidc_config.get("allow_existing_users", False),
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user_mapping_provider_class=user_mapping_provider_class,
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user_mapping_provider_config=user_mapping_provider_config,
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attribute_requirements=attribute_requirements,
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enable_registration=oidc_config.get("enable_registration", True),
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)
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class OidcProviderClientSecretJwtKey:
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# a pem-encoded signing key
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key: str
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# properties to include in the JWT header
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jwt_header: Mapping[str, str]
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# properties to include in the JWT payload.
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jwt_payload: Mapping[str, str]
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class OidcProviderConfig:
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# a unique identifier for this identity provider. Used in the 'user_external_ids'
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# table, as well as the query/path parameter used in the login protocol.
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idp_id: str
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# user-facing name for this identity provider.
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idp_name: str
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# Optional MXC URI for icon for this IdP.
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idp_icon: Optional[str]
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# Optional brand identifier for this IdP.
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idp_brand: Optional[str]
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# whether the OIDC discovery mechanism is used to discover endpoints
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discover: bool
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# the OIDC issuer. Used to validate tokens and (if discovery is enabled) to
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# discover the provider's endpoints.
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issuer: str
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# oauth2 client id to use
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client_id: str
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# oauth2 client secret to use. if `None`, use client_secret_jwt_key to generate
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# a secret.
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client_secret: Optional[str]
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# key to use to construct a JWT to use as a client secret. May be `None` if
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# `client_secret` is set.
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client_secret_jwt_key: Optional[OidcProviderClientSecretJwtKey]
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# auth method to use when exchanging the token.
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# Valid values are 'client_secret_basic', 'client_secret_post' and
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# 'none'.
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client_auth_method: str
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# Whether to enable PKCE when exchanging the authorization & token.
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# Valid values are 'auto', 'always', and 'never'.
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pkce_method: str
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# list of scopes to request
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scopes: Collection[str]
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# the oauth2 authorization endpoint. Required if discovery is disabled.
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authorization_endpoint: Optional[str]
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# the oauth2 token endpoint. Required if discovery is disabled.
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token_endpoint: Optional[str]
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# the OIDC userinfo endpoint. Required if discovery is disabled and the
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# "openid" scope is not requested.
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userinfo_endpoint: Optional[str]
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# URI where to fetch the JWKS. Required if discovery is disabled and the
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# "openid" scope is used.
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jwks_uri: Optional[str]
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# Whether Synapse should react to backchannel logouts
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backchannel_logout_enabled: bool
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# Whether Synapse should ignore the `sub` claim in backchannel logouts or not.
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backchannel_logout_ignore_sub: bool
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# Whether to skip metadata verification
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skip_verification: bool
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# Whether to fetch the user profile from the userinfo endpoint. Valid
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# values are: "auto" or "userinfo_endpoint".
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user_profile_method: str
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# whether to allow a user logging in via OIDC to match a pre-existing account
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# instead of failing
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allow_existing_users: bool
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# the class of the user mapping provider
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user_mapping_provider_class: Type
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# the config of the user mapping provider
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user_mapping_provider_config: Any
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# required attributes to require in userinfo to allow login/registration
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attribute_requirements: List[SsoAttributeRequirement]
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# Whether automatic registrations are enabled in the ODIC flow. Defaults to True
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enable_registration: bool
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