340 lines
12 KiB
Python
Executable file
340 lines
12 KiB
Python
Executable file
#!/usr/bin/env python2.4
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'''
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This is the web interface for a fileserver managing encrypted filesystems.
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It was originally written in bash/perl. Now a complete rewrite is in
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progress. So things might be confusing here. Hopefully not for long.
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:)
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TODO: replace all "sys.exit"-calls by a unified handler
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'''
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# check python version
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import sys
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(ver_major, ver_minor, ver_sub, ver_desc, ver_subsub) = sys.version_info
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if (ver_major < 2) or ((ver_major == 2) and (ver_minor < 4)):
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sys.stderr.write("You need a python version >= 2.4\nCurrent version is:\n %s\n" % sys.version)
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sys.exit(1)
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import CryptoBoxContainer
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import types
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import re
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import os
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import unittest
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import logging
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import subprocess
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CONF_LOCATIONS = [
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"./cryptobox.conf",
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"~/.cryptobox.conf",
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"/etc/cryptobox/cryptobox.conf"]
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SUDO_WRAPPER = ["sudo", "/home/lars/subversion/cryptobox/branches/pythonrewrite/bin2/CryptoBoxRootActions.py"]
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class CryptoBox:
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'''this class rules them all!
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put things like logging, conf and oter stuff in here,
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that might be used by more classes, it will be passed on to them'''
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def __init__(self, config_file=None):
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self.__initLogging()
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self.__initPreferences(config_file)
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self.__runTests()
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def __initLogging(self):
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import logging
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'''initialises the logging system
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use it with: 'self.log.[debug|info|warning|error|critical](logmessage)'
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all classes should get the logging instance during __init__:
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self.log = logging.getLogger("CryptoBox")
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first we output all warnings/errors to stderr
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as soon as we opened the config file successfully, we redirect debug output
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to the configured destination'''
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## basicConfig(...) needs python >= 2.4
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try:
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logging.basicConfig(
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format='%(asctime)s %(module)s %(levelname)s %(message)s',
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stream = sys.stderr)
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self.log = logging.getLogger("CryptoBox")
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self.log.setLevel(logging.WARN)
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self.log.info("loggingsystem is up'n running")
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## from now on everything can be logged via self.log...
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except:
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sys.stderr.write("Something with the loggingsystem went wrong. I give up.")
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sys.exit(1)
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def __initPreferences(self, config_file):
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try:
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import configobj ## needed for reading and writing of the config file
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except:
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self.log.error("Could't import 'configobj'! Try 'apt-get install python-configobj'.")
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sys.exit(1)
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# search for the configuration file
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if config_file is None:
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# no config file was specified - we will look for it in the ususal locations
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conf_file_list = [os.path.expanduser(f)
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for f in CONF_LOCATIONS
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if os.path.exists(os.path.expanduser(f))]
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if not conf_file_list:
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# no possible config file found in the usual locations
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self.log.error("No configuration file found - sorry!")
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sys.exit(1)
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config_file = conf_file_list[0]
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else:
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# a config file was specified (e.g. via command line)
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if not os.path.exists(config_file):
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self.log.error("Could not find the specified configuration file (%s)" % config_file)
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sys.exit(1)
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try:
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self.cbxPrefs = configobj.ConfigObj(config_file)
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self.log.debug("found config: %s" % self.cbxPrefs.items())
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# TODO/RFC: more specific exception handling, please - or (if you want to have fun) just replace the line above with the following:
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# self.cbxPrefs = configobj.ConfigObj(obviouslyInvalidVariableName)
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except:
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self.log.error("Could not read configuration file. I give up.")
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sys.exit(1)
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try:
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nameDB_file = os.path.join(
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self.cbxPrefs["Main"]["DataDir"],
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self.cbxPrefs["Main"]["NameDatabase"])
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if os.path.exists(nameDB_file):
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self.nameDB = configobj.ConfigObj(nameDB_file)
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else:
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self.nameDB = configobj.ConfigObj(nameDB_file, create_empty=True)
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except SyntaxError:
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self.log.error("Error during parsing of name database file (%s).\n" % (nameDB_file, ))
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sys.exit(1)
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# TODO: check if nameDB file was created successfully?
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# get the loglevel
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try:
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log_level = self.cbxPrefs["Log"]["Level"].upper()
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log_level_avail = ["DEBUG", "INFO", "WARN", "ERROR"]
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#if not log_level in ["DEBUG", "INFO", "WARN", "ERROR"]:
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if not log_level in log_level_avail:
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self.log.error("invalid log level: %s is not in %s" % (self.cbxPrefs["Log"]["Level"], log_level_avail))
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sys.exit(1)
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except TypeError:
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self.log.error("invalid log level: %s" % self.cbxPrefs["Log"]["Level"])
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sys.exit(1)
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try:
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new_handler = logging.FileHandler(self.cbxPrefs["Log"]["Details"])
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new_handler.setLevel(getattr(logging, log_level))
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# this formatter does not work for now
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new_handler.setFormatter = '%(asctime)s %(module)s %(levelname)s %(message)s'
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self.log.addHandler(new_handler)
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except IOError:
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self.log.error("could not open logfile: %s" % self.cbxPrefs["Log"]["Details"])
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sys.exit(1)
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# do some initial checks
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def __runTests(self):
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try:
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devnull = open(os.devnull, "w")
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except IOError:
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self.log.error("Could not open %s for writing!" % os.devnull)
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sys.exit(1)
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try:
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proc = subprocess.Popen(
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shell = False,
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stdout = devnull,
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stderr = devnull,
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args = [ self.cbxPrefs["Programs"]["super"],
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self.cbxPrefs["Programs"]["CryptoBoxRootActions"],
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"check"])
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except OSError:
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self.log.error("could not find: %s" % self.cbxPrefs["Programs"]["super"])
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sys.exit(1)
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proc.wait()
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if proc.returncode != 0:
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self.log.error("Could not call CryptoBoxRootActions by 'super' - maybe you did not add the appropriate line to /etc/super.tab?")
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sys.exit(1)
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# this method just demonstrates inheritance effects - may be removed
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def cbx_inheritance_test(self):
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print "you lucky widow"
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# RFC: why should CryptoBoxProps inherit CryptoBox? [l]
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# RFC: shouldn't we move all useful functions of CryptoBoxProps to CryptoBox? [l]
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class CryptoBoxProps(CryptoBox):
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'''Get and set the properties of a CryptoBox
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This class contains all available devices that may be accessed.
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All properties of the cryptobox can be accessed by this class.
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'''
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def __init__(self):
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'''read config and fill class variables'''
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CryptoBox.__init__(self)
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#self.cbx_inheritance_test()
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#print self.cbxPrefs.items()
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####
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self.containers = []
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for device in self.__getAvailablePartitions():
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if self.isDeviceAllowed(device):
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self.containers.append(CryptoBoxContainer.CryptoBoxContainer(device, self))
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def isDeviceAllowed(self, devicename):
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"check if a device is white-listed for being used as cryptobox containers"
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allowed = self.cbxPrefs["Main"]["AllowedDevices"]
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if type(allowed) == types.StringType: allowed = [allowed]
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for a_dev in allowed:
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"remove double dots and so on ..."
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real_device = os.path.realpath(devicename)
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if a_dev and re.search('^' + a_dev, real_device): return True
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return False
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def getContainerList(self, filterType=None, filterName=None):
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"retrieve the list of all containers of this cryptobox"
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try:
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result = self.containers[:]
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if filterType != None:
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if filterType in range(len(CryptoBoxContainer.Types)):
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return [e for e in self.containers if e.getType() == filterType]
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else:
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self.log.info("invalid filterType (%d)" % filterType)
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result.clear()
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if filterName != None:
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result = [e for e in self.containers if e.getName() == filterName]
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return result
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except AttributeError:
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return []
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def setNameForUUID(self, uuid, name):
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"assign a name to a uuid in the ContainerNameDatabase"
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used_uuid = self.getUUIDForName(name)
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"first remove potential conflicting uuid/name combination"
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if used_uuid: del self.nameDB[used_uuid]
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self.nameDB[uuid] = name
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self.nameDB.write()
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def getNameForUUID(self, uuid):
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"get the name belonging to a specified key (usually the UUID of a fs)"
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try:
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return self.nameDB[uuid]
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except KeyError:
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return None
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def getUUIDForName(self, name):
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""" get the key belonging to a value in the ContainerNameDatabase
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this is the reverse action of 'getNameForUUID' """
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for key in self.nameDB.keys():
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if self.nameDB[key] == name: return key
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"the uuid was not found"
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return None
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""" ************ internal stuff starts here *********** """
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def __getAvailablePartitions(self):
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"retrieve a list of all available containers"
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ret_list = []
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try:
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"the following reads all lines of /proc/partitions and adds the mentioned devices"
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fpart = open("/proc/partitions", "r")
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try:
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line = fpart.readline()
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while line:
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p_details = line.split()
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if (len(p_details) == 4):
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"the following code prevents double entries like /dev/hda and /dev/hda1"
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(p_major, p_minor, p_size, p_device) = p_details
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if re.search('^[0-9]*$', p_major) and re.search('^[0-9]*$', p_minor):
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p_parent = re.sub('[1-9]?[0-9]$', '', p_device)
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if p_parent == p_device:
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if [e for e in ret_list if re.search('^' + p_parent + '[1-9]?[0-9]$', e)]:
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"major partition - its children are already in the list"
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pass
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else:
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"major partition - but there are no children for now"
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ret_list.append(p_device)
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else:
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"minor partition - remove parent if necessary"
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if p_parent in ret_list: ret_list.remove(p_parent)
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ret_list.append(p_device)
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line = fpart.readline()
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finally:
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fpart.close()
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return [self.__getAbsoluteDeviceName(e) for e in ret_list]
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except IOError:
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self.log.warning("Could not read /proc/partitions")
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return []
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def __getAbsoluteDeviceName(self, shortname):
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""" returns the absolute file name of a device (e.g.: "hda1" -> "/dev/hda1")
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this does also work for device mapper devices
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if the result is non-unique, one arbitrary value is returned"""
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if re.search('^/', shortname): return shortname
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default = os.path.join("/dev", shortname)
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if os.path.exists(default): return default
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result = self.__findMajorMinorOfDevice(shortname)
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"if no valid major/minor was found -> exit"
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if not result: return default
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(major, minor) = result
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"for device-mapper devices (major == 254) ..."
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if major == 254:
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result = self.__findMajorMinorDeviceName("/dev/mapper", major, minor)
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if result: return result[0]
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"now check all files in /dev"
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result = self.__findMajorMinorDeviceName("/dev", major, minor)
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if result: return result[0]
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return default
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def __findMajorMinorOfDevice(self, device):
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"return the major/minor numbers of a block device by querying /sys/block/?/dev"
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if not os.path.exists(os.path.join("/sys/block", device)): return None
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blockdev_info_file = os.path.join(os.path.join("/sys/block", device), "dev")
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try:
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f_blockdev_info = open(blockdev_info_file, "r")
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blockdev_info = f_blockdev_info.read()
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f_blockdev_info.close()
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(str_major, str_minor) = blockdev_info.split(":")
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"numeric conversion"
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try:
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major = int(str_major)
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minor = int(str_minor)
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return (major, minor)
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except ValueError:
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"unknown device numbers -> stop guessing"
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return None
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except IOError:
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pass
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def __findMajorMinorDeviceName(self, dir, major, minor):
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"returns the names of devices with the specified major and minor number"
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collected = []
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try:
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subdirs = [os.path.join(dir, e) for e in os.listdir(dir) if (not os.path.islink(os.path.join(dir, e))) and os.path.isdir(os.path.join(dir, e))]
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"do a recursive call to parse the directory tree"
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for dirs in subdirs:
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collected.extend(self.__findMajorMinorDeviceName(dirs, major, minor))
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"filter all device inodes in this directory"
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collected.extend([os.path.realpath(os.path.join(dir, e)) for e in os.listdir(dir) if (os.major(os.stat(os.path.join(dir, e)).st_rdev) == major) and (os.minor(os.stat(os.path.join(dir, e)).st_rdev) == minor)])
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result = []
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for e in collected:
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if e not in result: result.append(e)
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return collected
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except OSError:
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return []
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if __name__ == "__main__":
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cb = CryptoBox()
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