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87 lines
3.7 KiB
Python
87 lines
3.7 KiB
Python
# This file is part of Radicale - CalDAV and CardDAV server
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# Copyright © 2012-2017 Guillaume Ayoub
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# Copyright © 2017-2019 Unrud <unrud@outlook.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Radicale. If not, see <http://www.gnu.org/licenses/>.
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"""
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Rights backend based on a regex-based file whose name is specified in the
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config (section "rights", key "file").
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The login is matched against the "user" key, and the collection path
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is matched against the "collection" key. In the "collection" regex you can use
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`{user}` and get groups from the "user" regex with `{0}`, `{1}`, etc.
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In consequence of the parameter substitution you have to write `{{` and `}}`
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if you want to use regular curly braces in the "user" and "collection" regexes.
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For example, for the "user" key, ".+" means "authenticated user" and ".*"
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means "anybody" (including anonymous users).
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Section names are only used for naming the rule.
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Leading or ending slashes are trimmed from collection's path.
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"""
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import configparser
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import re
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from radicale import config, pathutils, rights
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from radicale.log import logger
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class Rights(rights.BaseRights):
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_filename: str
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def __init__(self, configuration: config.Configuration) -> None:
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super().__init__(configuration)
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self._filename = configuration.get("rights", "file")
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def authorization(self, user: str, path: str) -> str:
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user = user or ""
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sane_path = pathutils.strip_path(path)
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# Prevent "regex injection"
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escaped_user = re.escape(user)
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rights_config = configparser.ConfigParser()
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try:
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with open(self._filename, "r") as f:
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rights_config.read_file(f)
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except Exception as e:
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raise RuntimeError("Failed to load rights file %r: %s" %
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(self._filename, e)) from e
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for section in rights_config.sections():
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try:
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user_pattern = rights_config.get(section, "user")
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collection_pattern = rights_config.get(section, "collection")
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# Use empty format() for harmonized handling of curly braces
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user_match = re.fullmatch(user_pattern.format(), user)
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collection_match = user_match and re.fullmatch(
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collection_pattern.format(
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*(re.escape(s) for s in user_match.groups()),
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user=escaped_user), sane_path)
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except Exception as e:
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raise RuntimeError("Error in section %r of rights file %r: "
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"%s" % (section, self._filename, e)) from e
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if user_match and collection_match:
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permission = rights_config.get(section, "permissions")
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logger.debug("Rule %r:%r matches %r:%r from section %r permission %r",
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user, sane_path, user_pattern,
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collection_pattern, section, permission)
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return permission
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logger.debug("Rule %r:%r doesn't match %r:%r from section %r",
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user, sane_path, user_pattern, collection_pattern,
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section)
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logger.info("Rights: %r:%r doesn't match any section", user, sane_path)
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return ""
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