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Merge pull request #9105 from matrix-org/rav/multi_idp/oidc_provider_config
Enhancements to OIDC configuration handling
This commit is contained in:
Richard van der Hoff
GitHub
commit
d02e4b2825
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changelog.d/9105.feature
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1
changelog.d/9105.feature
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@ -0,0 +1 @@
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Add support for multiple SSO Identity Providers.
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@ -1,5 +1,6 @@
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# -*- coding: utf-8 -*-
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# Copyright 2020 Quentin Gliech
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# Copyright 2020 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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@ -13,7 +14,13 @@
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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 typing import Optional, Type
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import attr
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from synapse.config._util import validate_config
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from synapse.python_dependencies import DependencyException, check_requirements
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from synapse.types import Collection, JsonDict
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from synapse.util.module_loader import load_module
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from ._base import Config, ConfigError
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@ -25,65 +32,32 @@ class OIDCConfig(Config):
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section = "oidc"
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def read_config(self, config, **kwargs):
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self.oidc_enabled = False
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validate_config(MAIN_CONFIG_SCHEMA, config, ())
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self.oidc_provider = None # type: Optional[OidcProviderConfig]
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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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validate_config(OIDC_PROVIDER_CONFIG_SCHEMA, oidc_config, "oidc_config")
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self.oidc_provider = _parse_oidc_config_dict(oidc_config)
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if not oidc_config or not oidc_config.get("enabled", False):
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if not self.oidc_provider:
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return
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try:
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check_requirements("oidc")
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except DependencyException as e:
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raise ConfigError(e.message)
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raise ConfigError(e.message) from e
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public_baseurl = self.public_baseurl
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if public_baseurl is None:
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raise ConfigError("oidc_config requires a public_baseurl to be set")
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self.oidc_callback_url = public_baseurl + "_synapse/oidc/callback"
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self.oidc_enabled = True
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self.oidc_discover = oidc_config.get("discover", True)
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self.oidc_issuer = oidc_config["issuer"]
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self.oidc_client_id = oidc_config["client_id"]
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self.oidc_client_secret = oidc_config["client_secret"]
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self.oidc_client_auth_method = oidc_config.get(
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"client_auth_method", "client_secret_basic"
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)
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self.oidc_scopes = oidc_config.get("scopes", ["openid"])
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self.oidc_authorization_endpoint = oidc_config.get("authorization_endpoint")
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self.oidc_token_endpoint = oidc_config.get("token_endpoint")
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self.oidc_userinfo_endpoint = oidc_config.get("userinfo_endpoint")
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self.oidc_jwks_uri = oidc_config.get("jwks_uri")
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self.oidc_skip_verification = oidc_config.get("skip_verification", False)
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self.oidc_user_profile_method = oidc_config.get("user_profile_method", "auto")
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self.oidc_allow_existing_users = oidc_config.get("allow_existing_users", False)
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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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ump_config.setdefault("config", {})
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(
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self.oidc_user_mapping_provider_class,
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self.oidc_user_mapping_provider_config,
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) = load_module(ump_config, ("oidc_config", "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(self.oidc_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 specified by oidc_config."
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"user_mapping_provider.module is missing required "
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"methods: %s" % (", ".join(missing_methods),)
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)
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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_provider)
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def generate_config_section(self, config_dir_path, server_name, **kwargs):
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return """\
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@ -224,3 +198,154 @@ class OIDCConfig(Config):
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""".format(
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mapping_provider=DEFAULT_USER_MAPPING_PROVIDER
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)
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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", "client_secret"],
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"properties": {
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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_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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"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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"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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},
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}
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# the `oidc_config` setting can either be None (as it is 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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MAIN_CONFIG_SCHEMA = {
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"type": "object",
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"properties": {"oidc_config": OIDC_CONFIG_SCHEMA},
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}
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def _parse_oidc_config_dict(oidc_config: JsonDict) -> "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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ump_config.setdefault("config", {})
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(user_mapping_provider_class, user_mapping_provider_config,) = load_module(
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ump_config, ("oidc_config", "user_mapping_provider")
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)
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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 specified by oidc_config."
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"user_mapping_provider.module is missing required "
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"methods: %s" % (", ".join(missing_methods),)
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)
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return OidcProviderConfig(
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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["client_secret"],
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client_auth_method=oidc_config.get("client_auth_method", "client_secret_basic"),
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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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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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)
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@attr.s
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class OidcProviderConfig:
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# whether the OIDC discovery mechanism is used to discover endpoints
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discover = attr.ib(type=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 = attr.ib(type=str)
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# oauth2 client id to use
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client_id = attr.ib(type=str)
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# oauth2 client secret to use
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client_secret = attr.ib(type=str)
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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 = attr.ib(type=str)
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# list of scopes to request
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scopes = attr.ib(type=Collection[str])
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# the oauth2 authorization endpoint. Required if discovery is disabled.
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authorization_endpoint = attr.ib(type=Optional[str])
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# the oauth2 token endpoint. Required if discovery is disabled.
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token_endpoint = attr.ib(type=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 = attr.ib(type=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 = attr.ib(type=Optional[str])
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# Whether to skip metadata verification
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skip_verification = attr.ib(type=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 = attr.ib(type=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 = attr.ib(type=bool)
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# the class of the user mapping provider
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user_mapping_provider_class = attr.ib(type=Type)
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# the config of the user mapping provider
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user_mapping_provider_config = attr.ib()
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@ -94,27 +94,30 @@ class OidcHandler:
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self._token_generator = OidcSessionTokenGenerator(hs)
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self._callback_url = hs.config.oidc_callback_url # type: str
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self._scopes = hs.config.oidc_scopes # type: List[str]
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self._user_profile_method = hs.config.oidc_user_profile_method # type: str
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provider = hs.config.oidc.oidc_provider
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# we should not have been instantiated if there is no configured provider.
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assert provider is not None
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self._scopes = provider.scopes
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self._user_profile_method = provider.user_profile_method
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self._client_auth = ClientAuth(
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hs.config.oidc_client_id,
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hs.config.oidc_client_secret,
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hs.config.oidc_client_auth_method,
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provider.client_id, provider.client_secret, provider.client_auth_method,
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) # type: ClientAuth
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self._client_auth_method = hs.config.oidc_client_auth_method # type: str
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self._client_auth_method = provider.client_auth_method
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self._provider_metadata = OpenIDProviderMetadata(
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issuer=hs.config.oidc_issuer,
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authorization_endpoint=hs.config.oidc_authorization_endpoint,
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token_endpoint=hs.config.oidc_token_endpoint,
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userinfo_endpoint=hs.config.oidc_userinfo_endpoint,
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jwks_uri=hs.config.oidc_jwks_uri,
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issuer=provider.issuer,
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authorization_endpoint=provider.authorization_endpoint,
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token_endpoint=provider.token_endpoint,
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userinfo_endpoint=provider.userinfo_endpoint,
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jwks_uri=provider.jwks_uri,
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) # type: OpenIDProviderMetadata
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self._provider_needs_discovery = hs.config.oidc_discover # type: bool
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self._user_mapping_provider = hs.config.oidc_user_mapping_provider_class(
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hs.config.oidc_user_mapping_provider_config
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) # type: OidcMappingProvider
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self._skip_verification = hs.config.oidc_skip_verification # type: bool
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self._allow_existing_users = hs.config.oidc_allow_existing_users # type: bool
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self._provider_needs_discovery = provider.discover
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self._user_mapping_provider = provider.user_mapping_provider_class(
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provider.user_mapping_provider_config
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)
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self._skip_verification = provider.skip_verification
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self._allow_existing_users = provider.allow_existing_users
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self._http_client = hs.get_proxied_http_client()
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self._server_name = hs.config.server_name # type: str
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