661 lines
26 KiB
Python
661 lines
26 KiB
Python
# This file is part of Radicale Server - Calendar Server
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# Copyright © 2008 Nicolas Kandel
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# Copyright © 2008 Pascal Halter
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# Copyright © 2008-2016 Guillaume Ayoub
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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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Radicale Server module.
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This module offers a WSGI application class.
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To use this module, you should take a look at the file ``radicale.py`` that
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should have been included in this package.
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"""
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import base64
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import contextlib
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import io
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import itertools
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import os
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import posixpath
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import pprint
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import socket
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import socketserver
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import ssl
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import threading
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import urllib
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import wsgiref.simple_server
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import zlib
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from http import client
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from urllib.parse import unquote, urlparse
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import vobject
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from . import auth, rights, storage, xmlutils
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VERSION = "2.0.0rc0"
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NOT_ALLOWED = (
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client.FORBIDDEN, (("Content-type", "text/plain"),),
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"Access to the requested resource forbidden.")
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NOT_FOUND = (
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client.NOT_FOUND, (("Content-type", "text/plain"),),
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"The requested resource could not be found.")
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WEBDAV_PRECONDITION_FAILED = (
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client.CONFLICT, (("Content-type", "text/plain"),),
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"WebDAV precondition failed.")
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PRECONDITION_FAILED = (
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client.PRECONDITION_FAILED,
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(("Content-type", "text/plain"),), "Precondition failed.")
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REQUEST_TIMEOUT = (
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client.REQUEST_TIMEOUT, (("Content-type", "text/plain"),),
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"Connection timed out.")
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REQUEST_ENTITY_TOO_LARGE = (
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client.REQUEST_ENTITY_TOO_LARGE, (("Content-type", "text/plain"),),
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"Request body too large.")
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REMOTE_DESTINATION = (
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client.BAD_GATEWAY, (("Content-type", "text/plain"),),
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"Remote destination not supported.")
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DIRECTORY_LISTING = (
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client.FORBIDDEN, (("Content-type", "text/plain"),),
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"Directory listings are not supported.")
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DAV_HEADERS = "1, 2, 3, calendar-access, addressbook, extended-mkcol"
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class HTTPServer(wsgiref.simple_server.WSGIServer):
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"""HTTP server."""
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# These class attributes must be set before creating instance
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client_timeout = None
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max_connections = None
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def __init__(self, address, handler, bind_and_activate=True):
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"""Create server."""
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ipv6 = ":" in address[0]
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if ipv6:
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self.address_family = socket.AF_INET6
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# Do not bind and activate, as we might change socket options
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super().__init__(address, handler, False)
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if ipv6:
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# Only allow IPv6 connections to the IPv6 socket
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self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
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if bind_and_activate:
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self.server_bind()
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self.server_activate()
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if self.max_connections:
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self.connections_guard = threading.BoundedSemaphore(
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self.max_connections)
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else:
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# use dummy context manager
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self.connections_guard = contextlib.suppress()
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def get_request(self):
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# Set timeout for client
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_socket, address = super().get_request()
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if self.client_timeout:
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_socket.settimeout(self.client_timeout)
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return _socket, address
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class HTTPSServer(HTTPServer):
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"""HTTPS server."""
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# These class attributes must be set before creating instance
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certificate = None
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key = None
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protocol = None
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ciphers = None
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def __init__(self, address, handler):
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"""Create server by wrapping HTTP socket in an SSL socket."""
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super().__init__(address, handler, bind_and_activate=False)
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self.socket = ssl.wrap_socket(
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self.socket, self.key, self.certificate, server_side=True,
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ssl_version=self.protocol, ciphers=self.ciphers)
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self.server_bind()
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self.server_activate()
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class ThreadedHTTPServer(socketserver.ThreadingMixIn, HTTPServer):
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def process_request_thread(self, request, client_address):
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with self.connections_guard:
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return super().process_request_thread(request, client_address)
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class ThreadedHTTPSServer(socketserver.ThreadingMixIn, HTTPSServer):
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def process_request_thread(self, request, client_address):
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with self.connections_guard:
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return super().process_request_thread(request, client_address)
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class RequestHandler(wsgiref.simple_server.WSGIRequestHandler):
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"""HTTP requests handler."""
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# These class attributes must be set before creating instance
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logger = None
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def __init__(self, *args, **kwargs):
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# Store exception for logging
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self.error_stream = io.StringIO()
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super().__init__(*args, **kwargs)
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def get_stderr(self):
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return self.error_stream
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def log_message(self, *args, **kwargs):
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"""Disable inner logging management."""
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def get_environ(self):
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env = super().get_environ()
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# Parent class only tries latin1 encoding
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env["PATH_INFO"] = urllib.parse.unquote(self.path.split("?", 1)[0])
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return env
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def handle(self):
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super().handle()
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# Log exception
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error = self.error_stream.getvalue().strip("\n")
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if error:
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self.logger.error(
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"An exception occurred during request:\n%s" % error)
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class Application:
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"""WSGI application managing collections."""
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def __init__(self, configuration, logger):
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"""Initialize application."""
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super().__init__()
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self.configuration = configuration
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self.logger = logger
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self.Auth = auth.load(configuration, logger)
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self.Collection = storage.load(configuration, logger)
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self.authorized = rights.load(configuration, logger)
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self.encoding = configuration.get("encoding", "request")
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def headers_log(self, environ):
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"""Sanitize headers for logging."""
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request_environ = dict(environ)
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# Remove environment variables
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if not self.configuration.getboolean("logging", "full_environment"):
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for shell_variable in os.environ:
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request_environ.pop(shell_variable, None)
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# Mask passwords
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mask_passwords = self.configuration.getboolean(
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"logging", "mask_passwords")
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authorization = request_environ.get(
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"HTTP_AUTHORIZATION", "").startswith("Basic")
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if mask_passwords and authorization:
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request_environ["HTTP_AUTHORIZATION"] = "Basic **masked**"
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return request_environ
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def decode(self, text, environ):
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"""Try to magically decode ``text`` according to given ``environ``."""
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# List of charsets to try
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charsets = []
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# First append content charset given in the request
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content_type = environ.get("CONTENT_TYPE")
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if content_type and "charset=" in content_type:
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charsets.append(
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content_type.split("charset=")[1].split(";")[0].strip())
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# Then append default Radicale charset
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charsets.append(self.encoding)
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# Then append various fallbacks
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charsets.append("utf-8")
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charsets.append("iso8859-1")
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# Try to decode
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for charset in charsets:
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try:
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return text.decode(charset)
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except UnicodeDecodeError:
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pass
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raise UnicodeDecodeError
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def collect_allowed_items(self, items, user):
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"""Get items from request that user is allowed to access."""
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read_allowed_items = []
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write_allowed_items = []
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for item in items:
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if isinstance(item, self.Collection):
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path = item.path
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else:
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path = item.collection.path
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if self.authorized(user, path, "r"):
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self.logger.debug(
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"%s has read access to collection %s",
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user or "Anonymous", path or "/")
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read_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO read access to collection %s",
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user or "Anonymous", path or "/")
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if self.authorized(user, path, "w"):
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self.logger.debug(
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"%s has write access to collection %s",
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user or "Anonymous", path or "/")
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write_allowed_items.append(item)
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else:
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self.logger.debug(
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"%s has NO write access to collection %s",
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user or "Anonymous", path or "/")
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return read_allowed_items, write_allowed_items
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def __call__(self, environ, start_response):
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"""Manage a request."""
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def response(status, headers=(), answer=None):
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headers = dict(headers)
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# Set content length
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if answer:
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self.logger.debug("Response content:\n%s", answer)
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answer = answer.encode(self.encoding)
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accept_encoding = [
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encoding.strip() for encoding in
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environ.get("HTTP_ACCEPT_ENCODING", "").split(",")
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if encoding.strip()]
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if "gzip" in accept_encoding:
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zcomp = zlib.compressobj(wbits=16 + zlib.MAX_WBITS)
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answer = zcomp.compress(answer) + zcomp.flush()
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headers["Content-Encoding"] = "gzip"
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headers["Content-Length"] = str(len(answer))
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# Add extra headers set in configuration
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if self.configuration.has_section("headers"):
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for key in self.configuration.options("headers"):
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headers[key] = self.configuration.get("headers", key)
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# Start response
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status = "%i %s" % (
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status, client.responses.get(status, "Unknown"))
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self.logger.debug("Answer status: %s", status)
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start_response(status, list(headers.items()))
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# Return response content
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return [answer] if answer else []
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self.logger.info("%s request at %s received",
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environ["REQUEST_METHOD"], environ["PATH_INFO"])
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headers = pprint.pformat(self.headers_log(environ))
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self.logger.debug("Request headers:\n%s", headers)
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# Strip base_prefix from request URI
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base_prefix = self.configuration.get("server", "base_prefix")
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if environ["PATH_INFO"].startswith(base_prefix):
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environ["PATH_INFO"] = environ["PATH_INFO"][len(base_prefix):]
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elif self.configuration.get("server", "can_skip_base_prefix"):
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self.logger.debug(
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"Prefix already stripped from path: %s", environ["PATH_INFO"])
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else:
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# Request path not starting with base_prefix, not allowed
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self.logger.debug(
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"Path not starting with prefix: %s", environ["PATH_INFO"])
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return response(*NOT_ALLOWED)
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# Sanitize request URI
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environ["PATH_INFO"] = storage.sanitize_path(
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unquote(environ["PATH_INFO"]))
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self.logger.debug("Sanitized path: %s", environ["PATH_INFO"])
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path = environ["PATH_INFO"]
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# Get function corresponding to method
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function = getattr(self, "do_%s" % environ["REQUEST_METHOD"].upper())
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# Ask authentication backend to check rights
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authorization = environ.get("HTTP_AUTHORIZATION", None)
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if authorization and authorization.startswith("Basic"):
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authorization = authorization[len("Basic"):].strip()
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login, password = self.decode(base64.b64decode(
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authorization.encode("ascii")), environ).split(":", 1)
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user = self.Auth.map_login_to_user(login)
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else:
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user = self.Auth.map_login_to_user(environ.get("REMOTE_USER", ""))
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password = None
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# If "/.well-known" is not available, clients query "/"
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if path == "/.well-known" or path.startswith("/.well-known/"):
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return response(*NOT_FOUND)
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if user and not storage.is_safe_path_component(user):
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# Prevent usernames like "user/calendar.ics"
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self.logger.info("Refused unsafe username: %s", user)
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is_authenticated = False
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else:
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is_authenticated = self.Auth.is_authenticated(user, password)
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is_valid_user = is_authenticated or not user
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# Create principal collection
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if user and is_authenticated:
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principal_path = "/%s/" % user
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if self.authorized(user, principal_path, "w"):
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with self.Collection.acquire_lock("r", user):
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principal = next(
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self.Collection.discover(principal_path, depth="1"),
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None)
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if not principal:
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with self.Collection.acquire_lock("w", user):
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self.Collection.create_collection(principal_path)
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# Verify content length
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content_length = int(environ.get("CONTENT_LENGTH") or 0)
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if content_length:
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max_content_length = self.configuration.getint(
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"server", "max_content_length")
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if max_content_length and content_length > max_content_length:
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self.logger.debug(
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"Request body too large: %d", content_length)
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return response(*REQUEST_ENTITY_TOO_LARGE)
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if is_valid_user:
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try:
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status, headers, answer = function(environ, path, user)
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except socket.timeout:
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return response(*REQUEST_TIMEOUT)
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else:
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status, headers, answer = NOT_ALLOWED
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if (status, headers, answer) == NOT_ALLOWED and not (
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user and is_authenticated):
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# Unknown or unauthorized user
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self.logger.info("%s refused" % (user or "Anonymous user"))
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status = client.UNAUTHORIZED
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realm = self.configuration.get("server", "realm")
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headers = headers.copy()
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headers.update ({
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"WWW-Authenticate":
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"Basic realm=\"%s\"" % realm})
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return response(status, headers, answer)
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def _access(self, user, path, permission, item=None):
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"""Check if ``user`` can access ``path`` or the parent collection.
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``permission`` must either be "r" or "w".
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If ``item`` is given, only access to that class of item is checked.
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"""
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path = storage.sanitize_path(path)
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parent_path = storage.sanitize_path(
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"/%s/" % posixpath.dirname(path.strip("/")))
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allowed = False
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if not item or isinstance(item, self.Collection):
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allowed |= self.authorized(user, path, permission)
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if not item or not isinstance(item, self.Collection):
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allowed |= self.authorized(user, parent_path, permission)
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return allowed
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def _read_content(self, environ):
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content_length = int(environ.get("CONTENT_LENGTH") or 0)
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if content_length > 0:
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content = self.decode(
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environ["wsgi.input"].read(content_length), environ)
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self.logger.debug("Request content:\n%s", content.strip())
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else:
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content = None
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return content
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def do_DELETE(self, environ, path, user):
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"""Manage DELETE request."""
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if not self._access(user, path, "w"):
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return NOT_ALLOWED
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with self.Collection.acquire_lock("w", user):
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item = next(self.Collection.discover(path), None)
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if not self._access(user, path, "w", item):
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return NOT_ALLOWED
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if not item:
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return NOT_FOUND
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if_match = environ.get("HTTP_IF_MATCH", "*")
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if if_match not in ("*", item.etag):
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# ETag precondition not verified, do not delete item
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return PRECONDITION_FAILED
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if isinstance(item, self.Collection):
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answer = xmlutils.delete(path, item)
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else:
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answer = xmlutils.delete(path, item.collection, item.href)
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return client.OK, {}, answer
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def do_GET(self, environ, path, user):
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"""Manage GET request."""
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# Display a "Radicale works!" message if the root URL is requested
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if not path.strip("/"):
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return client.OK, {"Content-type": "text/plain"}, "Radicale works!"
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if not self._access(user, path, "r"):
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return NOT_ALLOWED
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with self.Collection.acquire_lock("r", user):
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item = next(self.Collection.discover(path), None)
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if not self._access(user, path, "r", item):
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return NOT_ALLOWED
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if not item:
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return NOT_FOUND
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if isinstance(item, self.Collection):
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collection = item
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if collection.get_meta("tag") not in ("VADDRESSBOOK", "VCALENDAR"):
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return DIRECTORY_LISTING
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else:
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collection = item.collection
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content_type = xmlutils.MIMETYPES.get(
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collection.get_meta("tag"), "text/plain")
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headers = {
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"Content-Type": content_type,
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"Last-Modified": collection.last_modified,
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"ETag": item.etag}
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answer = item.serialize()
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return client.OK, headers, answer
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def do_HEAD(self, environ, path, user):
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"""Manage HEAD request."""
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status, headers, answer = self.do_GET(environ, path, user)
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return status, headers, None
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def do_MKCALENDAR(self, environ, path, user):
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"""Manage MKCALENDAR request."""
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if not self.authorized(user, path, "w"):
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return NOT_ALLOWED
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content = self._read_content(environ)
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with self.Collection.acquire_lock("w", user):
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item = next(self.Collection.discover(path), None)
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if item:
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return WEBDAV_PRECONDITION_FAILED
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props = xmlutils.props_from_request(content)
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props["tag"] = "VCALENDAR"
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# TODO: use this?
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# timezone = props.get("C:calendar-timezone")
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self.Collection.create_collection(path, props=props)
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return client.CREATED, {}, None
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def do_MKCOL(self, environ, path, user):
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"""Manage MKCOL request."""
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if not self.authorized(user, path, "w"):
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return NOT_ALLOWED
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content = self._read_content(environ)
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with self.Collection.acquire_lock("w", user):
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item = next(self.Collection.discover(path), None)
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if item:
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return WEBDAV_PRECONDITION_FAILED
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props = xmlutils.props_from_request(content)
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self.Collection.create_collection(path, props=props)
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return client.CREATED, {}, None
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|
|
def do_MOVE(self, environ, path, user):
|
|
"""Manage MOVE request."""
|
|
to_url = urlparse(environ["HTTP_DESTINATION"])
|
|
if to_url.netloc != environ["HTTP_HOST"]:
|
|
# Remote destination server, not supported
|
|
return REMOTE_DESTINATION
|
|
if not self._access(user, path, "w"):
|
|
return NOT_ALLOWED
|
|
to_path = storage.sanitize_path(to_url.path)
|
|
if not self._access(user, to_path, "w"):
|
|
return NOT_ALLOWED
|
|
|
|
with self.Collection.acquire_lock("w", user):
|
|
item = next(self.Collection.discover(path), None)
|
|
if not self._access(user, path, "w", item):
|
|
return NOT_ALLOWED
|
|
if not self._access(user, to_path, "w", item):
|
|
return NOT_ALLOWED
|
|
if not item:
|
|
return NOT_FOUND
|
|
if isinstance(item, self.Collection):
|
|
return WEBDAV_PRECONDITION_FAILED
|
|
|
|
to_item = next(self.Collection.discover(to_path), None)
|
|
if (isinstance(to_item, self.Collection) or
|
|
to_item and environ.get("HTTP_OVERWRITE", "F") != "T"):
|
|
return WEBDAV_PRECONDITION_FAILED
|
|
to_parent_path = storage.sanitize_path(
|
|
"/%s/" % posixpath.dirname(to_path.strip("/")))
|
|
to_collection = next(
|
|
self.Collection.discover(to_parent_path), None)
|
|
if not to_collection:
|
|
return WEBDAV_PRECONDITION_FAILED
|
|
to_href = posixpath.basename(to_path.strip("/"))
|
|
self.Collection.move(item, to_collection, to_href)
|
|
return client.CREATED, {}, None
|
|
|
|
def do_OPTIONS(self, environ, path, user):
|
|
"""Manage OPTIONS request."""
|
|
headers = {
|
|
"Allow": ", ".join(
|
|
name[3:] for name in dir(self) if name.startswith("do_")),
|
|
"DAV": DAV_HEADERS}
|
|
return client.OK, headers, None
|
|
|
|
def do_PROPFIND(self, environ, path, user):
|
|
"""Manage PROPFIND request."""
|
|
if not self._access(user, path, "r"):
|
|
return NOT_ALLOWED
|
|
content = self._read_content(environ)
|
|
with self.Collection.acquire_lock("r", user):
|
|
items = self.Collection.discover(
|
|
path, environ.get("HTTP_DEPTH", "0"))
|
|
# take root item for rights checking
|
|
item = next(items, None)
|
|
if not self._access(user, path, "r", item):
|
|
return NOT_ALLOWED
|
|
if not item:
|
|
return NOT_FOUND
|
|
# put item back
|
|
items = itertools.chain([item], items)
|
|
read_items, write_items = self.collect_allowed_items(items, user)
|
|
headers = {"DAV": DAV_HEADERS, "Content-Type": "text/xml"}
|
|
status, answer = xmlutils.propfind(
|
|
path, content, read_items, write_items, user)
|
|
if status == client.FORBIDDEN:
|
|
return NOT_ALLOWED
|
|
else:
|
|
return status, headers, answer
|
|
|
|
def do_PROPPATCH(self, environ, path, user):
|
|
"""Manage PROPPATCH request."""
|
|
if not self.authorized(user, path, "w"):
|
|
return NOT_ALLOWED
|
|
content = self._read_content(environ)
|
|
with self.Collection.acquire_lock("w", user):
|
|
item = next(self.Collection.discover(path), None)
|
|
if not isinstance(item, self.Collection):
|
|
return WEBDAV_PRECONDITION_FAILED
|
|
headers = {"DAV": DAV_HEADERS, "Content-Type": "text/xml"}
|
|
answer = xmlutils.proppatch(path, content, item)
|
|
return client.MULTI_STATUS, headers, answer
|
|
|
|
def do_PUT(self, environ, path, user):
|
|
"""Manage PUT request."""
|
|
if not self._access(user, path, "w"):
|
|
return NOT_ALLOWED
|
|
content = self._read_content(environ)
|
|
with self.Collection.acquire_lock("w", user):
|
|
parent_path = storage.sanitize_path(
|
|
"/%s/" % posixpath.dirname(path.strip("/")))
|
|
item = next(self.Collection.discover(path), None)
|
|
parent_item = next(self.Collection.discover(parent_path), None)
|
|
|
|
write_whole_collection = (
|
|
isinstance(item, self.Collection) or
|
|
not parent_item or (
|
|
not next(parent_item.list(), None) and
|
|
parent_item.get_meta("tag") not in (
|
|
"VADDRESSBOOK", "VCALENDAR")))
|
|
if write_whole_collection:
|
|
if not self.authorized(user, path, "w"):
|
|
return NOT_ALLOWED
|
|
elif not self.authorized(user, parent_path, "w"):
|
|
return NOT_ALLOWED
|
|
|
|
etag = environ.get("HTTP_IF_MATCH", "")
|
|
if not item and etag:
|
|
# Etag asked but no item found: item has been removed
|
|
return PRECONDITION_FAILED
|
|
if item and etag and item.etag != etag:
|
|
# Etag asked but item not matching: item has changed
|
|
return PRECONDITION_FAILED
|
|
|
|
match = environ.get("HTTP_IF_NONE_MATCH", "") == "*"
|
|
if item and match:
|
|
# Creation asked but item found: item can't be replaced
|
|
return PRECONDITION_FAILED
|
|
|
|
items = list(vobject.readComponents(content or ""))
|
|
content_type = environ.get("CONTENT_TYPE", "").split(";")[0]
|
|
tags = {value: key for key, value in xmlutils.MIMETYPES.items()}
|
|
tag = tags.get(content_type)
|
|
|
|
if write_whole_collection:
|
|
new_item = self.Collection.create_collection(
|
|
path, items, {"tag": tag})
|
|
else:
|
|
if tag:
|
|
parent_item.set_meta({"tag": tag})
|
|
href = posixpath.basename(path.strip("/"))
|
|
new_item = parent_item.upload(href, items[0])
|
|
headers = {"ETag": new_item.etag}
|
|
return client.CREATED, headers, None
|
|
|
|
def do_REPORT(self, environ, path, user):
|
|
"""Manage REPORT request."""
|
|
if not self._access(user, path, "w"):
|
|
return NOT_ALLOWED
|
|
content = self._read_content(environ)
|
|
with self.Collection.acquire_lock("r", user):
|
|
item = next(self.Collection.discover(path), None)
|
|
if not self._access(user, path, "w", item):
|
|
return NOT_ALLOWED
|
|
if not item:
|
|
return NOT_FOUND
|
|
if isinstance(item, self.Collection):
|
|
collection = item
|
|
else:
|
|
collection = item.collection
|
|
headers = {"Content-Type": "text/xml"}
|
|
answer = xmlutils.report(path, content, collection)
|
|
return client.MULTI_STATUS, headers, answer
|