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Python

#!/usr/bin/env python
#
# The daemon script to run the CryptoBox webserver.
#
# run the script with "--help" to see all possible paramters
#
#
# Copyright 2006 sense.lab e.V.
#
# This file is part of the CryptoBox.
#
# The CryptoBox is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# The CryptoBox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the CryptoBox; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
__revision__ = "$Id"
REMOVE_ENV_SETTINGS = [ "LANG", "LC", "LC_ALL", "LC_COLLATE", "LC_CTYPE",
"LC_MESSAGES", "LC_NUMERIC", "BASH_ENV", "SHELLOPTS" ]
import os, sys
import signal, atexit
import cryptobox.web.sites
from cryptobox.core.exceptions import *
from optparse import OptionParser
## check python version
(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\n")
sys.stderr.write("Current version is: %s\n" % sys.version)
sys.exit(1)
## check cherrypy dependency
try:
import cherrypy
except:
sys.stderr.write("Could not import the cherrypy module!\n")
sys.stderr.write("Try 'apt-get install python-cherrypy'.\n")
sys.exit(1)
## check clearsilver dependency
try:
import neo_cgi, neo_util
except:
sys.stderr.write("Could not import the clearsilver module!\n")
sys.stderr.write("Try 'apt-get install python-clearsilver'.\n")
sys.exit(1)
## check configobj dependency
try:
import configobj, validate
except:
sys.stderr.write("Could not import the configobj or validate module!\n")
sys.stderr.write("Try 'apt-get install python-configobj'.\n")
sys.exit(1)
SERVER_ENVIRONMENT = "production"
class CryptoBoxWebserver:
'''this class starts the cherrypy webserver and serves the single sites'''
def __init__(self, opts):
"""Configure cherrypy and check the location of the configuration file
"""
self.opts = opts
## check conffile
if not os.access(opts.conffile, os.R_OK) or not os.path.isfile(opts.conffile):
sys.stderr.write("Error: could not read configuration file (%s)\n" % opts.conffile)
sys.exit(1)
## store the absolute path as we will chdir later (for daemons)
self.conffile = os.path.realpath(opts.conffile)
## expose static content and set options
## beware:
cherrypy.config.update({
"global": {
"server.socket_port" : int(opts.port),
"server.socket_host" : opts.host,
"server.log_to_screen" : not opts.background and opts.verbose,
"server.log_tracebacks" : opts.verbose,
"server.log_request_headers": opts.verbose,
"server.environment": SERVER_ENVIRONMENT,
"server.log_file" : opts.logfile },
"/cryptobox-misc": {
"staticFilter.on" : True,
"staticFilter.dir": os.path.realpath(opts.datadir)},
"/favicon.ico": {
"staticFilter.on" : True,
"staticFilter.file": os.path.realpath(os.path.join(opts.datadir, 'favicon.ico'))}
})
def bootup_cryptobox(self):
## initialize site class
try:
cherrypy.root = cryptobox.web.sites.WebInterfaceSites(self.conffile)
self.website = cherrypy.root
except (CBConfigError,CBEnvironmentError), err_msg:
sys.stderr.write("Error: the CryptoBox is misconfigured - please fix it!\n")
raise
def get_user_info(self):
"""Retrieve the uid, gid and additional groups of the given user
"""
import pwd, grp
user_entry = pwd.getpwuid(self.opts.user)
## get the new uid and gid
pw_name, pw_uid, pw_gid = user_entry[0], user_entry[2], user_entry[3]
## change the owner of the webserver log file
try:
os.chown(self.opts.logfile, pw_uid, pw_gid)
except OSError:
## fail silently
pass
## calculate additional groups of the given user
additional_groups = [ entry[2]
for entry in grp.getgrall()
if pw_name in entry[3] ] + [ pw_gid ]
return (pw_uid, pw_gid, additional_groups)
def change_groups(self):
"""Change the groups of the current process to the ones of the given user
we have to do this before we call cherrypy.server.start(), as it somehow
remembers the current setting for any thread it will create later
"""
if self.opts.user is None:
return
(pw_uid, pw_gid, additional_groups) = self.get_user_info()
try:
os.setgroups(additional_groups)
except OSError, err_msg:
sys.stderr.write("Failed to change the groups: %s\n" % err_msg)
def drop_privileges_permanently(self):
"""Drop all privileges of the current process and acquire the privileges of the
given user instead.
"""
if self.opts.user is None:
return
(pw_uid, pw_gid, additional_groups) = self.get_user_info()
try:
## setgroups happened before (see 'change_groups')
os.setregid(pw_gid, pw_gid)
os.setreuid(pw_uid, pw_uid)
except OSError, err_msg:
sys.stderr.write("Failed to drop privileges permanently: %s\n" % err_msg)
def start(self):
try:
## first: change the groups (cherrypy.server.start stores the
## current setting for creating new threads later)
self.change_groups()
cherrypy.server.start(initOnly=True)
self.drop_privileges_permanently()
## this must be done with dropped privileges - otherwise there is
## at least a problem with 'blkid' - see bug #139
self.bootup_cryptobox()
cherrypy.server.wait_for_http_ready()
except cherrypy._cperror.NotReady, err_msg:
sys.stderr.write("Failed to start CryptoBox: %s\n" % err_msg)
sys.exit(1)
except Exception, err_msg:
if err_msg == "(98, 'Address already in use')":
sys.stderr.write("Failed to start CryptoBox: %s\n" % err_msg)
sys.exit(1)
else:
raise
def fork_to_background():
## this is just copy'n'pasted from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731
## check the original for exhaustive comments
try:
pid = os.fork()
except OSError, err_msg:
sys.stderr.write("Error: failed to fork cryptobox daemon process!\n")
sys.stderr.write("%s\n" % err_msg)
sys.exit(1)
if pid == 0: # the first child
os.setsid()
try:
pid = os.fork()
except OSError, err_msg:
sys.stderr.write("Error: failed to fork second cryptobox daemon process!\n")
sys.stderr.write("%s\n" % err_msg)
sys.exit(1)
if pid == 0: # the second child
## we do not change the directory - otherwise there seems to be a race condition with the python interpreter loading this script file
#os.chdir(os.path.sep)
os.umask(0)
else:
os._exit(0)
else:
os._exit(0)
def close_open_files():
"""this is only necessary if we want to go into background
we will only close stdin, stdout and stderr
"""
import resource # Resource usage information.
## use the following lines to close all open files (including the log file)
# maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
# if (maxfd == resource.RLIM_INFINITY):
# maxfd = 1024
maxfd = 2
for fd in range(0, maxfd):
try:
## close all except for stderr - we will redirect it later
if fd != 2:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
os.open(os.devnull, os.O_RDWR) # standard input (0)
os.dup2(0, 1) # standard output (1)
def write_pid_file(pid_file, pid=None):
"""write the process ID of the cryptonas daemon to a file
call this function with the second parameter (e.g. pid=0) to check, if the
given location is writeable
@param pid_file: the path of the pid file to be written
@type pid_file: string
@param pid: use a specific PID instead of the PID of the current process
@type pid: int
"""
if pid is None:
## use the PID of the current process
pid = os.getpid()
if os.path.exists(pid_file):
sys.stderr.write(
"Warning: pid file (%s) already exists - overwriting ...\n" % pid_file)
try:
pidf = open(pid_file,"w")
pidf.write(str(pid))
pidf.close()
except (IOError, OSError), err_msg:
sys.stderr.write(
"Warning: failed to write pid file (%s): %s\n" % (pid_file, err_msg))
## it is just a warning - no need to break
def parseOptions():
import cryptobox
import pwd
version = "%prog" + cryptobox.__version__
parser = OptionParser(version=version)
parser.set_defaults(conffile="/etc/cryptobox-server/cryptobox.conf",
pidfile="/var/run/cryptobox-server/webserver.pid",
background=False,
datadir="/usr/share/cryptobox-server/www-data",
logfile="/var/log/cryptobox-server/webserver.log",
port="8080",
host="",
verbose=True,
profile_file=False,
user=None)
parser.add_option("-c", "--config", dest="conffile",
help="read configuration from FILE", metavar="FILE")
parser.add_option("","--pidfile", dest="pidfile",
help="write process id to FILE", metavar="FILE")
parser.add_option("-B","", dest="background", action="store_true",
help="run webserver in background (as daemon)")
parser.add_option("-q","", dest="verbose", action="store_false",
help="output only errors")
parser.add_option("","--datadir", dest="datadir", metavar="DIR",
help="set data directory to DIR")
parser.add_option("-p","--port", dest="port", metavar="PORT",
help="listen on PORT")
parser.add_option("-l","--logfile", dest="logfile", metavar="FILE",
help="write webserver log to FILE")
parser.add_option("","--host", dest="host", metavar="HOST",
help="attach to HOST")
parser.add_option("-u","--user", dest="user", metavar="USER",
help="change to USER after starting the webserver")
parser.add_option("","--profile", dest="profile_file", metavar="PROFILE_FILE",
help="enable profiling and store results in PROFILE_FILE")
(options, args) = parser.parse_args()
## we do not expect any remaining arguments
if len(args) != 0:
parser.error("unknown argument: %s" % str(args[0]))
if not ((not os.path.exists(options.logfile) \
and os.access(os.path.dirname(options.logfile), os.W_OK)) \
or os.access(options.logfile, os.W_OK)):
parser.error("could not write to logfile (%s)" % options.logfile)
if not os.path.isdir(options.datadir) or not os.access(options.datadir,os.X_OK):
parser.error("could not access the data directory (%s)" % options.datadir)
try:
if (int(options.port) < 0) or (int(options.port) > 65535):
parser.error("invalid port number: %s" % str(options.port))
except ValueError:
parser.error("invalid port specified (%s) - it must be a number" % (options.port))
if options.user:
try:
try:
## check for the user given as uid
uid = pwd.getpwuid(int(options.user))[2]
except ValueError:
## check for the user given as name
uid = pwd.getpwnam(options.user)[2]
except KeyError:
## invalid user specified
parser.error("invalid user specified (%s)" % options.user)
## we will use the uid
options.user = uid
if options.profile_file:
options.profile_file = os.path.abspath(options.profile_file)
try:
import profile
except ImportError:
parser.error("profiling requires the python module 'profile' - debian users should run 'apt-get install python-profiler'")
return options
def clean_environment(settings_list):
"""Remove some environment settings with side effects (e.g. LANG)
Useful, as some plugins depend on the output of other commands - localized
output would be quite ugly for them ...
"""
for one_setting in settings_list:
os.unsetenv(one_setting)
if __name__ == "__main__":
## process arguments
options = parseOptions()
## set umask to 022 (aka 755) - octal value
os.umask(022)
## initialize the webserver class
cbw = CryptoBoxWebserver(options)
## remove some environment settings
clean_environment(REMOVE_ENV_SETTINGS)
## fork to background before cbw.start() - otherwise we lose the socket
if options.background:
fork_to_background()
## define the default exit handler
def exit_handler(signum, sigframe):
if hasattr(cbw, "website"):
## are we already up?
cbw.website.cbox.log.info("Shutting down ...")
cbw.website.cleanup()
cherrypy.server.stop()
try:
os.remove(options.pidfile)
except OSError:
pass
os._exit(0)
## the signal handler gets called by a kill signal (usually in background mode)
signal.signal(signal.SIGTERM, exit_handler)
## this exit handler gets called by KeyboardInterrupt and similar ones (foreground)
atexit.register(exit_handler, None, None)
## start the webserver
try:
if options.profile_file:
import profile
profile.run('cbw.start()', options.profile_file)
else:
cbw.start()
except CBError, err_msg:
sys.stderr.write("Failed to start the CryptoBox webserver!\n")
sys.stderr.write("%s\n" % str(err_msg))
sys.stderr.write("Check the log file for details.\n")
cherrypy.server.stop()
sys.exit(1)
## test if we can write to the PID file
## this _must_ be done before forking, since a potential error would be
## silent (due to the closed files - e.g. STDERR)
write_pid_file(options.pidfile, 0)
## redirect stderr to the webserver's logfile
if options.background:
## replace stdin and stdout by /dev/null
close_open_files()
## replace stderr by the webserver logfile
os.close(2)
os.open(options.logfile, os.O_WRONLY | os.O_APPEND)
## startup went fine - fork is done - now we may write the pid file
write_pid_file(options.pidfile)
## this will never exit - one of the above exit handlers will get triggered
cherrypy.server.block()