/usr/lib/python2.7/dist-packages/txdav/caldav/datastore/scheduling/ischedule/localservers.py is in calendarserver 5.2+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 | ##
# Copyright (c) 2011-2014 Apple Inc. All rights reserved.
#
# 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.
##
from twext.python.log import Logger
from twisted.internet.abstract import isIPAddress
from twistedcaldav.client.pool import installPool
from twistedcaldav.config import config, fullServerPath
from twistedcaldav.xmlutil import readXML
from txdav.caldav.datastore.scheduling.ischedule.utils import getIPsFromHost
import socket
import urlparse
"""
XML based server configuration file handling.
This is used in an environment where more than one server is being used within a single domain. i.e., all
the principals across the whole domain need to be able to directly schedule each other and know of each others
existence. A common scenario would be a production server and a development/test server.
Each server is identified by an id and url. The id is used when assigning principals to a specific server. Each
server can also support multiple partitions, and each of those is identified by an id and url, with the id also
being used to assign principals to a specific partition.
These servers support the concept of "partitioning" and "podding".
A "partitioned" service is one that spreads its
users out across multiple stores and does reverse proxying of incoming requests to the appropriate partitioned host.
All servers within the same partition have to be running the same version of the software etc.
A "podded" service is one where different groups of users are hosted on different servers, which may be of
different versions etc. A "pod" may itself be "partitioned", but the partitioning is "invisible" to the outside world.
"""
__all__ = [
"Servers",
]
log = Logger()
SERVER_SECRET_HEADER = "X-CALENDARSERVER-ISCHEDULE"
class ServersDB(object):
"""
Represents the set of servers within the same domain.
"""
def __init__(self):
self._servers = {}
self._xmlFile = None
self._thisServer = None
def load(self, xmlFile=None, ignoreIPLookupFailures=False):
if self._xmlFile is None or xmlFile is not None:
self._servers = {}
if xmlFile:
self._xmlFile = xmlFile
else:
self._xmlFile = fullServerPath(
config.ConfigRoot,
config.Servers.ConfigFile
)
self._servers = ServersParser.parse(self._xmlFile, ignoreIPLookupFailures=ignoreIPLookupFailures)
for server in self._servers.values():
if server.thisServer:
self._thisServer = server
break
else:
raise ValueError("No server in %s matches this server." % (self._xmlFile,))
def clear(self):
self._servers = {}
self._xmlFile = None
self._thisServer = None
def getServerById(self, id):
return self._servers.get(id)
def getServerURIById(self, id):
try:
return self._servers[id].uri
except KeyError:
return None
def getThisServer(self):
return self._thisServer
Servers = ServersDB() # Global server DB
class Server(object):
"""
Represents a server which may itself be partitioned.
"""
def __init__(self):
self.id = None
self.uri = None
self.thisServer = False
self.ips = set()
self.allowed_from_ips = set()
self.shared_secret = None
self.partitions = {}
self.partitions_ips = set()
self.isImplicit = True
def check(self, ignoreIPLookupFailures=False):
# Check whether this matches the current server
parsed_uri = urlparse.urlparse(self.uri)
if parsed_uri.hostname == config.ServerHostName:
if parsed_uri.scheme == "http":
if config.HTTPPort:
self.thisServer = parsed_uri.port in (config.HTTPPort,) + tuple(config.BindHTTPPorts)
elif parsed_uri.scheme == "https":
if config.SSLPort:
self.thisServer = parsed_uri.port in (config.SSLPort,) + tuple(config.BindSSLPorts)
# Need to cache IP addresses
try:
ips = getIPsFromHost(parsed_uri.hostname)
except socket.gaierror, e:
msg = "Unable to lookup ip-addr for server '%s': %s" % (parsed_uri.hostname, str(e))
log.error(msg)
if ignoreIPLookupFailures:
ips = ()
else:
raise ValueError(msg)
self.ips = set(ips)
actual_ips = set()
for item in self.allowed_from_ips:
if not isIPAddress(item):
try:
ips = getIPsFromHost(item)
except socket.gaierror, e:
msg = "Unable to lookup ip-addr for allowed-from '%s': %s" % (item, str(e))
log.error(msg)
if not ignoreIPLookupFailures:
raise ValueError(msg)
else:
actual_ips.update(ips)
else:
actual_ips.add(item)
self.allowed_from_ips = actual_ips
for uri in self.partitions.values():
parsed_uri = urlparse.urlparse(uri)
try:
ips = getIPsFromHost(parsed_uri.hostname)
except socket.gaierror, e:
msg = "Unable to lookup ip-addr for partition '%s': %s" % (parsed_uri.hostname, str(e))
log.error(msg)
if ignoreIPLookupFailures:
ips = ()
else:
raise ValueError(msg)
self.partitions_ips.update(ips)
def checkThisIP(self, ip):
"""
Check that the passed in IP address corresponds to this server or one of its partitions.
"""
return (ip in self.ips) or (ip in self.partitions_ips)
def hasAllowedFromIP(self):
return len(self.allowed_from_ips) > 0
def checkAllowedFromIP(self, ip):
return ip in self.allowed_from_ips
def checkSharedSecret(self, headers):
# Get header from the request
request_secret = headers.getRawHeaders(SERVER_SECRET_HEADER)
if request_secret is not None and self.shared_secret is None:
log.error("iSchedule request included unexpected %s header" % (SERVER_SECRET_HEADER,))
return False
elif request_secret is None and self.shared_secret is not None:
log.error("iSchedule request did not include required %s header" % (SERVER_SECRET_HEADER,))
return False
elif (request_secret[0] if request_secret else None) != self.shared_secret:
log.error("iSchedule request %s header did not match" % (SERVER_SECRET_HEADER,))
return False
else:
return True
def secretHeader(self):
"""
Return a tuple of header name, header value
"""
return (SERVER_SECRET_HEADER, self.shared_secret,)
def addPartition(self, id, uri):
self.partitions[id] = uri
def getPartitionURIForId(self, id):
return self.partitions.get(id)
def isPartitioned(self):
return len(self.partitions) != 0
def installReverseProxies(self, ownUID, maxClients):
for partition, url in self.partitions.iteritems():
if partition != ownUID:
installPool(
partition,
url,
maxClients,
)
ELEMENT_SERVERS = "servers"
ELEMENT_SERVER = "server"
ELEMENT_ID = "id"
ELEMENT_URI = "uri"
ELEMENT_ALLOWED_FROM = "allowed-from"
ELEMENT_SHARED_SECRET = "shared-secret"
ELEMENT_PARTITIONS = "partitions"
ELEMENT_PARTITION = "partition"
ATTR_IMPLICIT = "implicit"
ATTR_VALUE_YES = "yes"
ATTR_VALUE_NO = "no"
class ServersParser(object):
"""
Servers configuration file parser.
"""
@staticmethod
def parse(xmlFile, ignoreIPLookupFailures=False):
results = {}
# Read in XML
try:
_ignore_tree, servers_node = readXML(xmlFile, ELEMENT_SERVERS)
except ValueError, e:
raise RuntimeError("XML parse error for '%s' because: %s" % (xmlFile, e,))
for child in servers_node:
if child.tag != ELEMENT_SERVER:
raise RuntimeError("Unknown server type: '%s' in servers file: '%s'" % (child.tag, xmlFile,))
server = Server()
server.isImplicit = child.get(ATTR_IMPLICIT, ATTR_VALUE_YES) == ATTR_VALUE_YES
for node in child:
if node.tag == ELEMENT_ID:
server.id = node.text
elif node.tag == ELEMENT_URI:
server.uri = node.text
elif node.tag == ELEMENT_ALLOWED_FROM:
server.allowed_from_ips.add(node.text)
elif node.tag == ELEMENT_SHARED_SECRET:
server.shared_secret = node.text
elif node.tag == ELEMENT_PARTITIONS:
ServersParser._parsePartition(xmlFile, node, server)
else:
raise RuntimeError("Invalid element '%s' in servers file: '%s'" % (node.tag, xmlFile,))
if server.id is None or server.uri is None:
raise RuntimeError("Invalid partition '%s' in servers file: '%s'" % (child.tag, xmlFile,))
server.check(ignoreIPLookupFailures=ignoreIPLookupFailures)
results[server.id] = server
return results
@staticmethod
def _parsePartition(xmlFile, partitions, server):
for child in partitions:
if child.tag != ELEMENT_PARTITION:
raise RuntimeError("Unknown partition type: '%s' in servers file: '%s'" % (child.tag, xmlFile,))
id = None
uri = None
for node in child:
if node.tag == ELEMENT_ID:
id = node.text
elif node.tag == ELEMENT_URI:
uri = node.text
else:
raise RuntimeError("Invalid element '%s' in augment file: '%s'" % (node.tag, xmlFile,))
if id is None or uri is None:
raise RuntimeError("Invalid partition '%s' in servers file: '%s'" % (child.tag, xmlFile,))
server.addPartition(id, uri)
|