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# -*- coding: utf-8 -*-
# Copyright 2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import re
from synapse.api.errors import Codes, PasswordRefusedError
logger = logging.getLogger(__name__)
class PasswordPolicyHandler(object):
def __init__(self, hs):
self.policy = hs.config.password_policy
self.enabled = hs.config.password_policy_enabled
# Regexps for the spec'd policy parameters.
self.regexp_digit = re.compile("[0-9]")
self.regexp_symbol = re.compile("[^a-zA-Z0-9]")
self.regexp_uppercase = re.compile("[A-Z]")
self.regexp_lowercase = re.compile("[a-z]")
def validate_password(self, password):
"""Checks whether a given password complies with the server's policy.
Args:
password (str): The password to check against the server's policy.
Raises:
PasswordRefusedError: The password doesn't comply with the server's policy.
"""
if not self.enabled:
return
if len(password) < self.policy.get("minimum_length", 0):
raise PasswordRefusedError(Codes.PASSWORD_TOO_SHORT)
if (
self.policy.get("require_digit", False) and
self.regexp_digit.search(password) is None
):
raise PasswordRefusedError(Codes.PASSWORD_NO_DIGIT)
if (
self.policy.get("require_symbol", False) and
self.regexp_symbol.search(password) is None
):
raise PasswordRefusedError(Codes.PASSWORD_NO_SYMBOL)
if (
self.policy.get("require_uppercase", False) and
self.regexp_uppercase.search(password) is None
):
raise PasswordRefusedError(Codes.PASSWORD_NO_UPPERCASE)
if (
self.policy.get("require_lowercase", False) and
self.regexp_lowercase.search(password) is None
):
raise PasswordRefusedError(Codes.PASSWORD_NO_LOWERCASE)
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