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313581e4e9
* Pull runtime dep checks into their own module * Reimplement `check_requirements` using `importlib` I've tried to make this clearer. We start by working out which of Synapse's requirements we need to be installed here and now. I was surprised that there wasn't an easier way to see which packages were installed by a given extra. I've pulled out the error messages into functions that deal with "is this for an extra or not". And I've rearranged the loop over two different sets of requirements into one loop with a "must be instaled" flag. I hope you agree that this is clearer. * Test cases
587 lines
25 KiB
Python
587 lines
25 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 DependencyException, 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, **kwargs) -> 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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try:
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check_requirements("oidc")
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except DependencyException as e:
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raise ConfigError(
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e.message # noqa: B306, DependencyException.message is a property
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) from e
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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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def generate_config_section(self, config_dir_path, server_name, **kwargs) -> str:
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return """\
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# List of OpenID Connect (OIDC) / OAuth 2.0 identity providers, for registration
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# and login.
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#
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# Options for each entry include:
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#
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# idp_id: a unique identifier for this identity provider. Used internally
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# by Synapse; should be a single word such as 'github'.
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#
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# Note that, if this is changed, users authenticating via that provider
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# will no longer be recognised as the same user!
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#
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# (Use "oidc" here if you are migrating from an old "oidc_config"
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# configuration.)
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#
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# idp_name: A user-facing name for this identity provider, which is used to
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# offer the user a choice of login mechanisms.
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#
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# idp_icon: An optional icon for this identity provider, which is presented
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# by clients and Synapse's own IdP picker page. If given, must be an
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# MXC URI of the format mxc://<server-name>/<media-id>. (An easy way to
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# obtain such an MXC URI is to upload an image to an (unencrypted) room
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# and then copy the "url" from the source of the event.)
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#
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# idp_brand: An optional brand for this identity provider, allowing clients
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# to style the login flow according to the identity provider in question.
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# See the spec for possible options here.
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#
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# discover: set to 'false' to disable the use of the OIDC discovery mechanism
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# to discover endpoints. Defaults to true.
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#
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# issuer: Required. The OIDC issuer. Used to validate tokens and (if discovery
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# is enabled) to discover the provider's endpoints.
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#
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# client_id: Required. oauth2 client id to use.
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#
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# client_secret: oauth2 client secret to use. May be omitted if
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# client_secret_jwt_key is given, or if client_auth_method is 'none'.
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#
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# client_secret_jwt_key: Alternative to client_secret: details of a key used
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# to create a JSON Web Token to be used as an OAuth2 client secret. If
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# given, must be a dictionary with the following properties:
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#
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# key: a pem-encoded signing key. Must be a suitable key for the
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# algorithm specified. Required unless 'key_file' is given.
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#
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# key_file: the path to file containing a pem-encoded signing key file.
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# Required unless 'key' is given.
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#
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# jwt_header: a dictionary giving properties to include in the JWT
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# header. Must include the key 'alg', giving the algorithm used to
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# sign the JWT, such as "ES256", using the JWA identifiers in
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# RFC7518.
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#
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# jwt_payload: an optional dictionary giving properties to include in
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# the JWT payload. Normally this should include an 'iss' key.
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#
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# client_auth_method: auth method to use when exchanging the token. Valid
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# values are 'client_secret_basic' (default), 'client_secret_post' and
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# 'none'.
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#
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# scopes: list of scopes to request. This should normally include the "openid"
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# scope. Defaults to ["openid"].
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#
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# authorization_endpoint: the oauth2 authorization endpoint. Required if
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# provider discovery is disabled.
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#
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# token_endpoint: the oauth2 token endpoint. Required if provider discovery is
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# disabled.
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#
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# userinfo_endpoint: the OIDC userinfo endpoint. Required if discovery is
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# disabled and the 'openid' scope is not requested.
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#
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# jwks_uri: URI where to fetch the JWKS. Required if discovery is disabled and
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# the 'openid' scope is used.
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#
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# skip_verification: set to 'true' to skip metadata verification. Use this if
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# you are connecting to a provider that is not OpenID Connect compliant.
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# Defaults to false. Avoid this in production.
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#
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# user_profile_method: Whether to fetch the user profile from the userinfo
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# endpoint, or to rely on the data returned in the id_token from the
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# token_endpoint.
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#
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# Valid values are: 'auto' or 'userinfo_endpoint'.
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#
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# Defaults to 'auto', which uses the userinfo endpoint if 'openid' is
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# not included in 'scopes'. Set to 'userinfo_endpoint' to always use the
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# userinfo endpoint.
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#
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# allow_existing_users: set to 'true' to allow a user logging in via OIDC to
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# match a pre-existing account instead of failing. This could be used if
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# switching from password logins to OIDC. Defaults to false.
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#
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# user_mapping_provider: Configuration for how attributes returned from a OIDC
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# provider are mapped onto a matrix user. This setting has the following
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# sub-properties:
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#
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# module: The class name of a custom mapping module. Default is
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# {mapping_provider!r}.
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# See https://matrix-org.github.io/synapse/latest/sso_mapping_providers.html#openid-mapping-providers
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# for information on implementing a custom mapping provider.
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#
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# config: Configuration for the mapping provider module. This section will
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# be passed as a Python dictionary to the user mapping provider
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# module's `parse_config` method.
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#
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# For the default provider, the following settings are available:
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#
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# subject_claim: name of the claim containing a unique identifier
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# for the user. Defaults to 'sub', which OpenID Connect
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# compliant providers should provide.
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#
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# localpart_template: Jinja2 template for the localpart of the MXID.
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# If this is not set, the user will be prompted to choose their
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# own username (see 'sso_auth_account_details.html' in the 'sso'
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# section of this file).
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#
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# display_name_template: Jinja2 template for the display name to set
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# on first login. If unset, no displayname will be set.
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#
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# email_template: Jinja2 template for the email address of the user.
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# If unset, no email address will be added to the account.
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#
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# extra_attributes: a map of Jinja2 templates for extra attributes
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# to send back to the client during login.
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# Note that these are non-standard and clients will ignore them
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# without modifications.
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#
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# When rendering, the Jinja2 templates are given a 'user' variable,
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# which is set to the claims returned by the UserInfo Endpoint and/or
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# in the ID Token.
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#
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# It is possible to configure Synapse to only allow logins if certain attributes
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# match particular values in the OIDC userinfo. The requirements can be listed under
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# `attribute_requirements` as shown below. All of the listed attributes must
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# match for the login to be permitted. Additional attributes can be added to
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# userinfo by expanding the `scopes` section of the OIDC config to retrieve
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# additional information from the OIDC provider.
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#
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# If the OIDC claim is a list, then the attribute must match any value in the list.
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# Otherwise, it must exactly match the value of the claim. Using the example
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# below, the `family_name` claim MUST be "Stephensson", but the `groups`
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# claim MUST contain "admin".
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#
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# attribute_requirements:
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# - attribute: family_name
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# value: "Stephensson"
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# - attribute: groups
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# value: "admin"
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#
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# See https://matrix-org.github.io/synapse/latest/openid.html
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# for information on how to configure these options.
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#
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# For backwards compatibility, it is also possible to configure a single OIDC
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# provider via an 'oidc_config' setting. This is now deprecated and admins are
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# advised to migrate to the 'oidc_providers' format. (When doing that migration,
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# use 'oidc' for the idp_id to ensure that existing users continue to be
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# recognised.)
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#
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oidc_providers:
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# Generic example
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#
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#- idp_id: my_idp
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# idp_name: "My OpenID provider"
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# idp_icon: "mxc://example.com/mediaid"
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# discover: false
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# issuer: "https://accounts.example.com/"
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# client_id: "provided-by-your-issuer"
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# client_secret: "provided-by-your-issuer"
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# client_auth_method: client_secret_post
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# scopes: ["openid", "profile"]
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# authorization_endpoint: "https://accounts.example.com/oauth2/auth"
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# token_endpoint: "https://accounts.example.com/oauth2/token"
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# userinfo_endpoint: "https://accounts.example.com/userinfo"
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# jwks_uri: "https://accounts.example.com/.well-known/jwks.json"
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# skip_verification: true
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# user_mapping_provider:
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# config:
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# subject_claim: "id"
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# localpart_template: "{{{{ user.login }}}}"
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# display_name_template: "{{{{ user.name }}}}"
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# email_template: "{{{{ user.email }}}}"
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# attribute_requirements:
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# - attribute: userGroup
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# value: "synapseUsers"
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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"],
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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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"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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"attribute_requirements": {
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"type": "array",
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"items": SsoAttributeRequirement.JSON_SCHEMA,
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},
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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":
|
|
idp_id = "oidc-" + idp_id
|
|
|
|
# MSC2858 also specifies that the idp_icon must be a valid MXC uri
|
|
idp_icon = oidc_config.get("idp_icon")
|
|
if idp_icon is not None:
|
|
try:
|
|
parse_and_validate_mxc_uri(idp_icon)
|
|
except ValueError as e:
|
|
raise ConfigError(
|
|
"idp_icon must be a valid MXC URI", config_path + ("idp_icon",)
|
|
) from e
|
|
|
|
client_secret_jwt_key_config = oidc_config.get("client_secret_jwt_key")
|
|
client_secret_jwt_key: Optional[OidcProviderClientSecretJwtKey] = None
|
|
if client_secret_jwt_key_config is not None:
|
|
keyfile = client_secret_jwt_key_config.get("key_file")
|
|
if keyfile:
|
|
key = read_file(keyfile, config_path + ("client_secret_jwt_key",))
|
|
else:
|
|
key = client_secret_jwt_key_config["key"]
|
|
client_secret_jwt_key = OidcProviderClientSecretJwtKey(
|
|
key=key,
|
|
jwt_header=client_secret_jwt_key_config["jwt_header"],
|
|
jwt_payload=client_secret_jwt_key_config.get("jwt_payload", {}),
|
|
)
|
|
# parse attribute_requirements from config (list of dicts) into a list of SsoAttributeRequirement
|
|
attribute_requirements = [
|
|
SsoAttributeRequirement(**x)
|
|
for x in oidc_config.get("attribute_requirements", [])
|
|
]
|
|
|
|
return OidcProviderConfig(
|
|
idp_id=idp_id,
|
|
idp_name=oidc_config.get("idp_name", "OIDC"),
|
|
idp_icon=idp_icon,
|
|
idp_brand=oidc_config.get("idp_brand"),
|
|
discover=oidc_config.get("discover", True),
|
|
issuer=oidc_config["issuer"],
|
|
client_id=oidc_config["client_id"],
|
|
client_secret=oidc_config.get("client_secret"),
|
|
client_secret_jwt_key=client_secret_jwt_key,
|
|
client_auth_method=oidc_config.get("client_auth_method", "client_secret_basic"),
|
|
scopes=oidc_config.get("scopes", ["openid"]),
|
|
authorization_endpoint=oidc_config.get("authorization_endpoint"),
|
|
token_endpoint=oidc_config.get("token_endpoint"),
|
|
userinfo_endpoint=oidc_config.get("userinfo_endpoint"),
|
|
jwks_uri=oidc_config.get("jwks_uri"),
|
|
skip_verification=oidc_config.get("skip_verification", False),
|
|
user_profile_method=oidc_config.get("user_profile_method", "auto"),
|
|
allow_existing_users=oidc_config.get("allow_existing_users", False),
|
|
user_mapping_provider_class=user_mapping_provider_class,
|
|
user_mapping_provider_config=user_mapping_provider_config,
|
|
attribute_requirements=attribute_requirements,
|
|
)
|
|
|
|
|
|
@attr.s(slots=True, frozen=True, auto_attribs=True)
|
|
class OidcProviderClientSecretJwtKey:
|
|
# a pem-encoded signing key
|
|
key: str
|
|
|
|
# properties to include in the JWT header
|
|
jwt_header: Mapping[str, str]
|
|
|
|
# properties to include in the JWT payload.
|
|
jwt_payload: Mapping[str, str]
|
|
|
|
|
|
@attr.s(slots=True, frozen=True, auto_attribs=True)
|
|
class OidcProviderConfig:
|
|
# a unique identifier for this identity provider. Used in the 'user_external_ids'
|
|
# table, as well as the query/path parameter used in the login protocol.
|
|
idp_id: str
|
|
|
|
# user-facing name for this identity provider.
|
|
idp_name: str
|
|
|
|
# Optional MXC URI for icon for this IdP.
|
|
idp_icon: Optional[str]
|
|
|
|
# Optional brand identifier for this IdP.
|
|
idp_brand: Optional[str]
|
|
|
|
# whether the OIDC discovery mechanism is used to discover endpoints
|
|
discover: bool
|
|
|
|
# the OIDC issuer. Used to validate tokens and (if discovery is enabled) to
|
|
# discover the provider's endpoints.
|
|
issuer: str
|
|
|
|
# oauth2 client id to use
|
|
client_id: str
|
|
|
|
# oauth2 client secret to use. if `None`, use client_secret_jwt_key to generate
|
|
# a secret.
|
|
client_secret: Optional[str]
|
|
|
|
# key to use to construct a JWT to use as a client secret. May be `None` if
|
|
# `client_secret` is set.
|
|
client_secret_jwt_key: Optional[OidcProviderClientSecretJwtKey]
|
|
|
|
# auth method to use when exchanging the token.
|
|
# Valid values are 'client_secret_basic', 'client_secret_post' and
|
|
# 'none'.
|
|
client_auth_method: str
|
|
|
|
# list of scopes to request
|
|
scopes: Collection[str]
|
|
|
|
# the oauth2 authorization endpoint. Required if discovery is disabled.
|
|
authorization_endpoint: Optional[str]
|
|
|
|
# the oauth2 token endpoint. Required if discovery is disabled.
|
|
token_endpoint: Optional[str]
|
|
|
|
# the OIDC userinfo endpoint. Required if discovery is disabled and the
|
|
# "openid" scope is not requested.
|
|
userinfo_endpoint: Optional[str]
|
|
|
|
# URI where to fetch the JWKS. Required if discovery is disabled and the
|
|
# "openid" scope is used.
|
|
jwks_uri: Optional[str]
|
|
|
|
# Whether to skip metadata verification
|
|
skip_verification: bool
|
|
|
|
# Whether to fetch the user profile from the userinfo endpoint. Valid
|
|
# values are: "auto" or "userinfo_endpoint".
|
|
user_profile_method: str
|
|
|
|
# whether to allow a user logging in via OIDC to match a pre-existing account
|
|
# instead of failing
|
|
allow_existing_users: bool
|
|
|
|
# the class of the user mapping provider
|
|
user_mapping_provider_class: Type
|
|
|
|
# the config of the user mapping provider
|
|
user_mapping_provider_config: Any
|
|
|
|
# required attributes to require in userinfo to allow login/registration
|
|
attribute_requirements: List[SsoAttributeRequirement]
|