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98 lines
3.4 KiB
Python
98 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 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 re
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import string
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import saml2.response
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__version__ = "0.0.1"
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class SamlMappingProvider(object):
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def __init__(self):
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mxid_localpart_allowed_characters = set(
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"_-./=" + string.ascii_lowercase + string.digits
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)
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self._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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self._multiple_to_single_dot_pattern = re.compile(r"\.{2,}")
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self._string_end_dot_pattern = re.compile(r"\.$")
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def saml_response_to_user_attributes(
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self,
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config: dict,
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saml_response: saml2.response.AuthnResponse,
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failures: int = 0,
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) -> dict:
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"""Maps some text from a SAML response to attributes of a new user
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Args:
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config: A configuration dictionary
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saml_response: A SAML auth response object
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failures: How many times a call to this function with this
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saml_response has resulted in a failure
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Returns:
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dict: A dict containing new user attributes. Possible keys:
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* mxid_localpart (str): Required. The localpart of the user's mxid
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* displayname (str): The displayname of the user
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"""
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# The calling function will catch the KeyError if this fails
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mxid_source = saml_response.ava[config["mxid_source_attribute"]][0]
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# Truncate the username to the first found '@' character to prevent complete
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# emails being leaked
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pos = mxid_source.find("@")
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if pos >= 0:
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mxid_source = mxid_source[:pos]
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mxid_localpart = self._dotreplace_for_mxid(mxid_source)
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# Append suffix integer if last call to this function failed to produce
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# a usable mxid
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localpart = mxid_localpart + (str(failures) if failures else "")
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# Retrieve the display name from the saml response
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displayname = saml_response.ava.get("displayName", [None])[0]
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return {
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"mxid_localpart": localpart,
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"displayname": displayname,
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}
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def _dotreplace_for_mxid(self, username: str) -> str:
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"""Replace non-allowed mxid characters with a '.'
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Args:
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username (str): The username to process
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Returns:
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str: The processed username
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"""
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username = username.lower()
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username = self._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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# Change all instances of multiple dots together into a single dot
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username = self._multiple_to_single_dot_pattern.sub(".", username)
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# Remove any trailing dots
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username = self._string_end_dot_pattern.sub("", username)
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return username
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