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a8ac40445c
We want to assign unique mxids to saml users based on an incrementing suffix. For that to work, we need to record the allocated mxid in a separate table.
226 lines
8.3 KiB
Python
226 lines
8.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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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 re
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from synapse.python_dependencies import DependencyException, check_requirements
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from synapse.types import (
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map_username_to_mxid_localpart,
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mxid_localpart_allowed_characters,
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)
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from ._base import Config, ConfigError
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class SAML2Config(Config):
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def read_config(self, config, **kwargs):
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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(e.message)
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self.saml2_enabled = True
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self.saml2_mxid_source_attribute = saml2_config.get(
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"mxid_source_attribute", "uid"
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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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import saml2.config
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self.saml2_sp_config = saml2.config.SPConfig()
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self.saml2_sp_config.load(self._default_saml_config_dict())
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self.saml2_sp_config.load(saml2_config.get("sp_config", {}))
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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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self.saml2_sp_config.load_file(config_path)
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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", "5m")
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)
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mapping = saml2_config.get("mxid_mapping", "hexencode")
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try:
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self.saml2_mxid_mapper = MXID_MAPPER_MAP[mapping]
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except KeyError:
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raise ConfigError("%s is not a known mxid_mapping" % (mapping,))
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def _default_saml_config_dict(self):
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import saml2
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public_baseurl = self.public_baseurl
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if public_baseurl is None:
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raise ConfigError("saml2_config requires a public_baseurl to be set")
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required_attributes = {"uid", self.saml2_mxid_source_attribute}
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optional_attributes = {"displayName"}
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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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metadata_url = public_baseurl + "_matrix/saml2/metadata.xml"
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response_url = public_baseurl + "_matrix/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):
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return """\
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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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# (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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# Once SAML support is enabled, a metadata file will be exposed at
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# https://<server>:<port>/_matrix/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>/_matrix/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 can use either a local file or
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# # (preferably) a URL.
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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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#
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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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#
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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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#
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# description: ["My awesome SP", "en"]
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# name: ["Test SP", "en"]
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#
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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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#
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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 5 minutes.
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#
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#saml_session_lifetime: 5m
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# The SAML attribute (after mapping via the attribute maps) to use to derive
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# the Matrix ID from. 'uid' by default.
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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 matrix ID.
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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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# The default is 'hexencode'.
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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 MXID was
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# always calculated dynamically rather than stored in a table. For backwards-
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# compatibility, we will look for user_ids matching such a pattern before
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# 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 the
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# 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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""" % {
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"config_dir_path": config_dir_path
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}
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DOT_REPLACE_PATTERN = re.compile(
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("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),))
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)
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def dot_replace_for_mxid(username: str) -> str:
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username = username.lower()
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username = DOT_REPLACE_PATTERN.sub(".", username)
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# regular mxids aren't allowed to start with an underscore either
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username = re.sub("^_", "", username)
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return username
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MXID_MAPPER_MAP = {
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"hexencode": map_username_to_mxid_localpart,
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"dotreplace": dot_replace_for_mxid,
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}
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