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#!/usr/bin/env python2.4
'''
This is the web interface for a fileserver managing encrypted filesystems.
It was originally written in bash/perl. Now a complete rewrite is in
progress. So things might be confusing here. Hopefully not for long.
:)
'''
# check python version
import sys
(ver_major, ver_minor, ver_sub, ver_desc, ver_subsub) = sys.version_info
if (ver_major < 2) or ((ver_major == 2) and (ver_minor < 4)):
sys.stderr.write("You need a python version >= 2.4\nCurrent version is:\n %s\n" % sys.version)
sys.exit(1)
import CryptoBoxContainer
from CryptoBoxExceptions import *
import re
import os
import CryptoBoxTools
import subprocess
class CryptoBox:
'''this class rules them all!
put things like logging, conf and oter stuff in here,
that might be used by more classes, it will be passed on to them'''
VERSION = "0.3~1"
def __init__(self, config_file=None):
import CryptoBoxSettings
self.log = self.__getStartupLogger()
self.prefs = CryptoBoxSettings.CryptoBoxSettings(config_file)
self.__runTests()
def __getStartupLogger(self):
import logging
'''initialises the logging system
use it with: 'self.log.[debug|info|warning|error|critical](logmessage)'
all classes should get the logging instance during __init__:
self.log = logging.getLogger("CryptoBox")
first we output all warnings/errors to stderr
as soon as we opened the config file successfully, we redirect debug output
to the configured destination'''
## basicConfig(...) needs python >= 2.4
try:
log_handler = logging.getLogger("CryptoBox")
logging.basicConfig(
format='%(asctime)s CryptoBox %(levelname)s: %(message)s',
stderr=sys.stderr)
log_handler.setLevel(logging.ERROR)
log_handler.info("loggingsystem is up'n running")
## from now on everything can be logged via self.log...
except:
raise CBEnvironmentError("couldn't initialise the loggingsystem. I give up.")
return log_handler
# do some initial checks
def __runTests(self):
self.__runTestUID()
self.__runTestRootPriv()
def __runTestUID(self):
if os.geteuid() == 0:
raise CBEnvironmentError("you may not run the cryptobox as root")
def __runTestRootPriv(self):
"""try to run 'super' with 'CryptoBoxRootActions'"""
try:
devnull = open(os.devnull, "w")
except IOError:
raise CBEnvironmentError("could not open %s for writing!" % os.devnull)
try:
prog_super = self.prefs["Programs"]["super"]
except KeyError:
raise CBConfigUndefinedError("Programs", "super")
try:
prog_rootactions = self.prefs["Programs"]["CryptoBoxRootActions"]
except KeyError:
raise CBConfigUndefinedError("Programs", "CryptoBoxRootActions")
try:
proc = subprocess.Popen(
shell = False,
stdout = devnull,
stderr = devnull,
args = [prog_super, prog_rootactions, "check"])
except OSError:
raise CBEnvironmentError("failed to execute 'super' (%s)" % self.prefs["Programs"]["super"])
proc.wait()
if proc.returncode != 0:
raise CBEnvironmentError("failed to call CryptoBoxRootActions (%s) via 'super' - maybe you did not add the appropriate line to /etc/super.tab?" % prog_rootactions)
# this method just demonstrates inheritance effects - may be removed
def cbx_inheritance_test(self, string="you lucky widow"):
self.log.info(string)
# RFC: why should CryptoBoxProps inherit CryptoBox? [l]
# RFC: shouldn't we move all useful functions of CryptoBoxProps to CryptoBox? [l]
class CryptoBoxProps(CryptoBox):
'''Get and set the properties of a CryptoBox
This class contains all available devices that may be accessed.
All properties of the cryptobox can be accessed by this class.
'''
def __init__(self, config_file=None):
'''read config and fill class variables'''
CryptoBox.__init__(self, config_file)
self.reReadContainerList()
def reReadContainerList(self):
self.log.debug("rereading container list")
self.containers = []
for device in CryptoBoxTools.getAvailablePartitions():
if self.isDeviceAllowed(device) and not self.isConfigPartition(device):
self.containers.append(CryptoBoxContainer.CryptoBoxContainer(device, self))
## sort by container name
self.containers.sort(cmp = lambda x,y: x.getName() < y.getName() and -1 or 1)
def isConfigPartition(self, device):
proc = subprocess.Popen(
shell = False,
stdout = subprocess.PIPE,
args = [
self.prefs["Programs"]["blkid"],
"-c", os.path.devnull,
"-o", "value",
"-s", "LABEL",
device])
(output, error) = proc.communicate()
return output.strip() == self.prefs["Main"]["ConfigVolumeLabel"]
def isDeviceAllowed(self, devicename):
"check if a device is white-listed for being used as cryptobox containers"
import types
allowed = self.prefs["Main"]["AllowedDevices"]
if type(allowed) == types.StringType: allowed = [allowed]
for a_dev in allowed:
"remove double dots and so on ..."
real_device = os.path.realpath(devicename)
if a_dev and re.search('^' + a_dev, real_device): return True
return False
def getLogData(self, lines=None, maxSize=None):
"""get the most recent log entries of the cryptobox
the maximum number and size of these entries can be limited by 'lines' and 'maxSize'
"""
# return nothing if the currently selected log output is not a file
try:
if self.prefs["Log"]["Destination"].upper() != "FILE": return []
log_file = self.prefs["Log"]["Details"]
except KeyError:
self.log.error("could not evaluate one of the following config settings: [Log]->Destination or [Log]->Details")
return []
try:
fd = open(log_file, "r")
if maxSize: fd.seek(-maxSize, 2) # seek relative to the end of the file
content = fd.readlines()
fd.close()
except IOError:
self.log.warn("failed to read the log file (%s)" % log_file)
return []
if lines: content = content[-lines:]
content.reverse()
return content
def getContainerList(self, filterType=None, filterName=None):
"retrieve the list of all containers of this cryptobox"
try:
result = self.containers[:]
if filterType != None:
if filterType in range(len(CryptoBoxContainer.Types)):
return [e for e in self.containers if e.getType() == filterType]
else:
self.log.info("invalid filterType (%d)" % filterType)
result.clear()
if filterName != None:
result = [e for e in self.containers if e.getName() == filterName]
return result
except AttributeError:
return []
def getContainer(self, device):
"retrieve the container element for this device"
all = [e for e in self.getContainerList() if e.device == device]
if all:
return all[0]
else:
return None
def setNameForUUID(self, uuid, name):
"assign a name to a uuid in the ContainerNameDatabase"
used_uuid = self.getUUIDForName(name)
"first remove potential conflicting uuid/name combination"
if used_uuid:
## remember the container which name was overriden
for e in self.containers:
if e.getName() == name:
forcedRename = e
break
del self.prefs.nameDB[used_uuid]
self.prefs.nameDB[uuid] = name
self.prefs.nameDB.write()
## rename the container that lost its name (necessary while we use cherrypy)
if used_uuid:
## this is surely not the best way to regenerate the name
dev = e.getDevice()
old_index = self.containers.index(e)
self.containers.remove(e)
self.containers.insert(old_index, CryptoBoxContainer.CryptoBoxContainer(dev,self))
## there should be no reason for any failure
return True
def getNameForUUID(self, uuid):
"get the name belonging to a specified key (usually the UUID of a fs)"
try:
return self.prefs.nameDB[uuid]
except KeyError:
return None
def getUUIDForName(self, name):
""" get the key belonging to a value in the ContainerNameDatabase
this is the reverse action of 'getNameForUUID' """
for key in self.prefs.nameDB.keys():
if self.prefs.nameDB[key] == name: return key
"the uuid was not found"
return None
def removeUUID(self, uuid):
if uuid in self.prefs.nameDB.keys():
del self.prefs.nameDB[uuid]
return True
else:
return False
def getAvailableLanguages(self):
'''reads all files in path LangDir and returns a list of
basenames from existing hdf files, that should are all available
languages'''
languages = [ f.rstrip(".hdf")
for f in os.listdir(self.prefs["Locations"]["LangDir"])
if f.endswith(".hdf") ]
if len(languages) < 1:
self.log.error("No .hdf files found! The website won't render properly.")
return languages
if __name__ == "__main__":
cb = CryptoBoxProps()