596 lines
25 KiB
Python
596 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 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.python_dependencies import DependencyException, check_requirements
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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 ._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):
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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.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/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):
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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. Valid values are: 'auto' or 'userinfo_endpoint'.
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#
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# Defaults to 'auto', which fetches the userinfo endpoint if 'openid' is
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# included in 'scopes'. Set to 'userinfo_endpoint' to always fetch 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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"idp_unstable_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":
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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:
|
|
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 = None # type: Optional[OidcProviderClientSecretJwtKey]
|
|
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"),
|
|
unstable_idp_brand=oidc_config.get("unstable_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)
|
|
class OidcProviderClientSecretJwtKey:
|
|
# a pem-encoded signing key
|
|
key = attr.ib(type=str)
|
|
|
|
# properties to include in the JWT header
|
|
jwt_header = attr.ib(type=Mapping[str, str])
|
|
|
|
# properties to include in the JWT payload.
|
|
jwt_payload = attr.ib(type=Mapping[str, str])
|
|
|
|
|
|
@attr.s(slots=True, frozen=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 = attr.ib(type=str)
|
|
|
|
# user-facing name for this identity provider.
|
|
idp_name = attr.ib(type=str)
|
|
|
|
# Optional MXC URI for icon for this IdP.
|
|
idp_icon = attr.ib(type=Optional[str])
|
|
|
|
# Optional brand identifier for this IdP.
|
|
idp_brand = attr.ib(type=Optional[str])
|
|
|
|
# Optional brand identifier for the unstable API (see MSC2858).
|
|
unstable_idp_brand = attr.ib(type=Optional[str])
|
|
|
|
# whether the OIDC discovery mechanism is used to discover endpoints
|
|
discover = attr.ib(type=bool)
|
|
|
|
# the OIDC issuer. Used to validate tokens and (if discovery is enabled) to
|
|
# discover the provider's endpoints.
|
|
issuer = attr.ib(type=str)
|
|
|
|
# oauth2 client id to use
|
|
client_id = attr.ib(type=str)
|
|
|
|
# oauth2 client secret to use. if `None`, use client_secret_jwt_key to generate
|
|
# a secret.
|
|
client_secret = attr.ib(type=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 = attr.ib(type=Optional[OidcProviderClientSecretJwtKey])
|
|
|
|
# auth method to use when exchanging the token.
|
|
# Valid values are 'client_secret_basic', 'client_secret_post' and
|
|
# 'none'.
|
|
client_auth_method = attr.ib(type=str)
|
|
|
|
# list of scopes to request
|
|
scopes = attr.ib(type=Collection[str])
|
|
|
|
# the oauth2 authorization endpoint. Required if discovery is disabled.
|
|
authorization_endpoint = attr.ib(type=Optional[str])
|
|
|
|
# the oauth2 token endpoint. Required if discovery is disabled.
|
|
token_endpoint = attr.ib(type=Optional[str])
|
|
|
|
# the OIDC userinfo endpoint. Required if discovery is disabled and the
|
|
# "openid" scope is not requested.
|
|
userinfo_endpoint = attr.ib(type=Optional[str])
|
|
|
|
# URI where to fetch the JWKS. Required if discovery is disabled and the
|
|
# "openid" scope is used.
|
|
jwks_uri = attr.ib(type=Optional[str])
|
|
|
|
# Whether to skip metadata verification
|
|
skip_verification = attr.ib(type=bool)
|
|
|
|
# Whether to fetch the user profile from the userinfo endpoint. Valid
|
|
# values are: "auto" or "userinfo_endpoint".
|
|
user_profile_method = attr.ib(type=str)
|
|
|
|
# whether to allow a user logging in via OIDC to match a pre-existing account
|
|
# instead of failing
|
|
allow_existing_users = attr.ib(type=bool)
|
|
|
|
# the class of the user mapping provider
|
|
user_mapping_provider_class = attr.ib(type=Type)
|
|
|
|
# the config of the user mapping provider
|
|
user_mapping_provider_config = attr.ib()
|
|
|
|
# required attributes to require in userinfo to allow login/registration
|
|
attribute_requirements = attr.ib(type=List[SsoAttributeRequirement])
|