425 lines
16 KiB
Python
425 lines
16 KiB
Python
# Copyright 2018 New Vector Ltd
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# Copyright 2019-2021 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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import logging
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from typing import Any, List, Set
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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, load_python_module
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from ._base import Config, ConfigError
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from ._util import validate_config
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logger = logging.getLogger(__name__)
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DEFAULT_USER_MAPPING_PROVIDER = "synapse.handlers.saml.DefaultSamlMappingProvider"
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# The module that DefaultSamlMappingProvider is in was renamed, we want to
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# transparently handle both the same.
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LEGACY_USER_MAPPING_PROVIDER = (
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"synapse.handlers.saml_handler.DefaultSamlMappingProvider"
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)
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def _dict_merge(merge_dict: dict, into_dict: dict) -> None:
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"""Do a deep merge of two dicts
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Recursively merges `merge_dict` into `into_dict`:
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* For keys where both `merge_dict` and `into_dict` have a dict value, the values
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are recursively merged
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* For all other keys, the values in `into_dict` (if any) are overwritten with
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the value from `merge_dict`.
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Args:
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merge_dict: dict to merge
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into_dict: target dict to be modified
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"""
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for k, v in merge_dict.items():
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if k not in into_dict:
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into_dict[k] = v
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continue
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current_val = into_dict[k]
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if isinstance(v, dict) and isinstance(current_val, dict):
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_dict_merge(v, current_val)
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continue
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# otherwise we just overwrite
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into_dict[k] = v
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class SAML2Config(Config):
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section = "saml2"
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def read_config(self, config, **kwargs) -> None:
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self.saml2_enabled = False
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saml2_config = config.get("saml2_config")
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if not saml2_config or not saml2_config.get("enabled", True):
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return
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if not saml2_config.get("sp_config") and not saml2_config.get("config_path"):
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return
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try:
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check_requirements("saml2")
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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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)
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self.saml2_enabled = True
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attribute_requirements = saml2_config.get("attribute_requirements") or []
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self.attribute_requirements = _parse_attribute_requirements_def(
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attribute_requirements
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)
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self.saml2_grandfathered_mxid_source_attribute = saml2_config.get(
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"grandfathered_mxid_source_attribute", "uid"
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)
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self.saml2_idp_entityid = saml2_config.get("idp_entityid", None)
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# user_mapping_provider may be None if the key is present but has no value
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ump_dict = saml2_config.get("user_mapping_provider") or {}
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# Use the default user mapping provider if not set
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ump_dict.setdefault("module", DEFAULT_USER_MAPPING_PROVIDER)
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if ump_dict.get("module") == LEGACY_USER_MAPPING_PROVIDER:
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ump_dict["module"] = DEFAULT_USER_MAPPING_PROVIDER
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# Ensure a config is present
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ump_dict["config"] = ump_dict.get("config") or {}
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if ump_dict["module"] == DEFAULT_USER_MAPPING_PROVIDER:
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# Load deprecated options for use by the default module
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old_mxid_source_attribute = saml2_config.get("mxid_source_attribute")
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if old_mxid_source_attribute:
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logger.warning(
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"The config option saml2_config.mxid_source_attribute is deprecated. "
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"Please use saml2_config.user_mapping_provider.config"
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".mxid_source_attribute instead."
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)
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ump_dict["config"]["mxid_source_attribute"] = old_mxid_source_attribute
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old_mxid_mapping = saml2_config.get("mxid_mapping")
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if old_mxid_mapping:
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logger.warning(
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"The config option saml2_config.mxid_mapping is deprecated. Please "
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"use saml2_config.user_mapping_provider.config.mxid_mapping instead."
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)
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ump_dict["config"]["mxid_mapping"] = old_mxid_mapping
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# Retrieve an instance of the module's class
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# Pass the config dictionary to the module for processing
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(
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self.saml2_user_mapping_provider_class,
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self.saml2_user_mapping_provider_config,
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) = load_module(ump_dict, ("saml2_config", "user_mapping_provider"))
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# Ensure loaded user mapping module has defined all necessary methods
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# Note parse_config() is already checked during the call to load_module
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required_methods = [
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"get_saml_attributes",
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"saml_response_to_user_attributes",
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"get_remote_user_id",
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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.saml2_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 saml2_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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# Get the desired saml auth response attributes from the module
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saml2_config_dict = self._default_saml_config_dict(
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*self.saml2_user_mapping_provider_class.get_saml_attributes(
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self.saml2_user_mapping_provider_config
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)
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)
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_dict_merge(
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merge_dict=saml2_config.get("sp_config", {}), into_dict=saml2_config_dict
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)
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config_path = saml2_config.get("config_path", None)
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if config_path is not None:
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mod = load_python_module(config_path)
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config = getattr(mod, "CONFIG", None)
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if config is None:
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raise ConfigError(
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"Config path specified by saml2_config.config_path does not "
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"have a CONFIG property."
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)
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_dict_merge(merge_dict=config, into_dict=saml2_config_dict)
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import saml2.config
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self.saml2_sp_config = saml2.config.SPConfig()
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self.saml2_sp_config.load(saml2_config_dict)
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# session lifetime: in milliseconds
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self.saml2_session_lifetime = self.parse_duration(
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saml2_config.get("saml_session_lifetime", "15m")
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)
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def _default_saml_config_dict(
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self, required_attributes: Set[str], optional_attributes: Set[str]
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) -> JsonDict:
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"""Generate a configuration dictionary with required and optional attributes that
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will be needed to process new user registration
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Args:
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required_attributes: SAML auth response attributes that are
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necessary to function
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optional_attributes: SAML auth response attributes that can be used to add
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additional information to Synapse user accounts, but are not required
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Returns:
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A SAML configuration dictionary
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"""
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import saml2
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if self.saml2_grandfathered_mxid_source_attribute:
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optional_attributes.add(self.saml2_grandfathered_mxid_source_attribute)
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optional_attributes -= required_attributes
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public_baseurl = self.root.server.public_baseurl
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metadata_url = public_baseurl + "_synapse/client/saml2/metadata.xml"
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response_url = public_baseurl + "_synapse/client/saml2/authn_response"
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return {
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"entityid": metadata_url,
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"service": {
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"sp": {
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"endpoints": {
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"assertion_consumer_service": [
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(response_url, saml2.BINDING_HTTP_POST)
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]
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},
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"required_attributes": list(required_attributes),
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"optional_attributes": list(optional_attributes),
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# "name_id_format": saml2.saml.NAMEID_FORMAT_PERSISTENT,
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}
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},
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}
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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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## Single sign-on integration ##
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# The following settings can be used to make Synapse use a single sign-on
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# provider for authentication, instead of its internal password database.
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#
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# You will probably also want to set the following options to `false` to
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# disable the regular login/registration flows:
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# * enable_registration
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# * password_config.enabled
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#
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# You will also want to investigate the settings under the "sso" configuration
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# section below.
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# Enable SAML2 for registration and login. Uses pysaml2.
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#
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# At least one of `sp_config` or `config_path` must be set in this section to
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# enable SAML login.
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#
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# Once SAML support is enabled, a metadata file will be exposed at
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# https://<server>:<port>/_synapse/client/saml2/metadata.xml, which you may be able to
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# use to configure your SAML IdP with. Alternatively, you can manually configure
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# the IdP to use an ACS location of
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# https://<server>:<port>/_synapse/client/saml2/authn_response.
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#
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saml2_config:
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# `sp_config` is the configuration for the pysaml2 Service Provider.
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# See pysaml2 docs for format of config.
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#
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# Default values will be used for the 'entityid' and 'service' settings,
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# so it is not normally necessary to specify them unless you need to
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# override them.
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#
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sp_config:
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# Point this to the IdP's metadata. You must provide either a local
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# file via the `local` attribute or (preferably) a URL via the
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# `remote` attribute.
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#
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#metadata:
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# local: ["saml2/idp.xml"]
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# remote:
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# - url: https://our_idp/metadata.xml
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# Allowed clock difference in seconds between the homeserver and IdP.
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#
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# Uncomment the below to increase the accepted time difference from 0 to 3 seconds.
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#
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#accepted_time_diff: 3
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# By default, the user has to go to our login page first. If you'd like
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# to allow IdP-initiated login, set 'allow_unsolicited: true' in a
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# 'service.sp' section:
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#
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#service:
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# sp:
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# allow_unsolicited: true
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# The examples below are just used to generate our metadata xml, and you
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# may well not need them, depending on your setup. Alternatively you
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# may need a whole lot more detail - see the pysaml2 docs!
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#description: ["My awesome SP", "en"]
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#name: ["Test SP", "en"]
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#ui_info:
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# display_name:
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# - lang: en
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# text: "Display Name is the descriptive name of your service."
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# description:
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# - lang: en
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# text: "Description should be a short paragraph explaining the purpose of the service."
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# information_url:
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# - lang: en
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# text: "https://example.com/terms-of-service"
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# privacy_statement_url:
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# - lang: en
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# text: "https://example.com/privacy-policy"
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# keywords:
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# - lang: en
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# text: ["Matrix", "Element"]
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# logo:
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# - lang: en
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# text: "https://example.com/logo.svg"
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# width: "200"
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# height: "80"
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#organization:
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# name: Example com
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# display_name:
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# - ["Example co", "en"]
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# url: "http://example.com"
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#contact_person:
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# - given_name: Bob
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# sur_name: "the Sysadmin"
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# email_address": ["admin@example.com"]
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# contact_type": technical
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# Instead of putting the config inline as above, you can specify a
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# separate pysaml2 configuration file:
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#
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#config_path: "%(config_dir_path)s/sp_conf.py"
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# The lifetime of a SAML session. This defines how long a user has to
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# complete the authentication process, if allow_unsolicited is unset.
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# The default is 15 minutes.
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#
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#saml_session_lifetime: 5m
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# An external module can be provided here as a custom solution to
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# mapping attributes returned from a saml provider onto a matrix user.
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#
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user_mapping_provider:
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# The custom module's class. Uncomment to use a custom module.
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#
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#module: mapping_provider.SamlMappingProvider
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# Custom configuration values for the module. Below options are
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# intended for the built-in provider, they should be changed if
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# using a custom module. This section will be passed as a Python
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# dictionary to the module's `parse_config` method.
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#
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config:
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# The SAML attribute (after mapping via the attribute maps) to use
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# to derive the Matrix ID from. 'uid' by default.
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#
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# Note: This used to be configured by the
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# saml2_config.mxid_source_attribute option. If that is still
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# defined, its value will be used instead.
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#
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#mxid_source_attribute: displayName
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# The mapping system to use for mapping the saml attribute onto a
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# matrix ID.
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#
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# Options include:
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# * 'hexencode' (which maps unpermitted characters to '=xx')
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# * 'dotreplace' (which replaces unpermitted characters with
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# '.').
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# The default is 'hexencode'.
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#
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# Note: This used to be configured by the
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# saml2_config.mxid_mapping option. If that is still defined, its
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# value will be used instead.
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#
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#mxid_mapping: dotreplace
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# In previous versions of synapse, the mapping from SAML attribute to
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# MXID was always calculated dynamically rather than stored in a
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# table. For backwards- compatibility, we will look for user_ids
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# matching such a pattern before creating a new account.
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#
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# This setting controls the SAML attribute which will be used for this
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# backwards-compatibility lookup. Typically it should be 'uid', but if
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# the attribute maps are changed, it may be necessary to change it.
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#
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# The default is 'uid'.
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#
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#grandfathered_mxid_source_attribute: upn
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# It is possible to configure Synapse to only allow logins if SAML attributes
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# match particular values. 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.
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#
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#attribute_requirements:
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# - attribute: userGroup
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# value: "staff"
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# - attribute: department
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# value: "sales"
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# If the metadata XML contains multiple IdP entities then the `idp_entityid`
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# option must be set to the entity to redirect users to.
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#
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# Most deployments only have a single IdP entity and so should omit this
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# option.
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#
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#idp_entityid: 'https://our_idp/entityid'
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""" % {
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"config_dir_path": config_dir_path
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}
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ATTRIBUTE_REQUIREMENTS_SCHEMA = {
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"type": "array",
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"items": SsoAttributeRequirement.JSON_SCHEMA,
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}
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def _parse_attribute_requirements_def(
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attribute_requirements: Any,
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) -> List[SsoAttributeRequirement]:
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validate_config(
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ATTRIBUTE_REQUIREMENTS_SCHEMA,
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attribute_requirements,
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config_path=("saml2_config", "attribute_requirements"),
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)
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return [SsoAttributeRequirement(**x) for x in attribute_requirements]
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