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- Committer: Björn Påhlsson
- Date: 2008-07-21 03:58:36 UTC
- mfrom: (17 mandos)
- mto: This revision was merged to the branch mainline in revision 20.
- Revision ID: belorn@braxen-20080721035836-v7220bmolr608r61
Added getopt_long support for mandosclient and passprompt
Added support for --interface for mandosclient
Added support for --prefix for passprompt
Added support for --interface for mandosclient
Added support for --prefix for passprompt
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
6
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# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
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# <http://avahi.org/wiki/PythonPublishExample>. This includes the
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# methods "add" and "remove" in the "AvahiService" class, the
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# "server_state_changed" and "entry_group_state_changed" functions,
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# and some lines in "main".
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# following functions: "add_service", "remove_service",
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# "server_state_changed", "entry_group_state_changed", and some lines
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# in "main".
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#
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# Everything else is
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# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
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# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
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# Påhlsson.
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#
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# This program 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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# 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 this program. If not, see
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# <http://www.gnu.org/licenses/>.
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Contact the authors at <mandos@fukt.bsnet.se>.
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# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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# <https://www.fukt.bsnet.se/~teddy/>.
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#
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from __future__ import division, with_statement, absolute_import
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from __future__ import division
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import SocketServer
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import socket
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import select
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from optparse import OptionParser
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import datetime
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import errno
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import stat
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import logging
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import logging.handlers
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import pwd
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from contextlib import closing
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import dbus
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import gobject
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import avahi
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from dbus.mainloop.glib import DBusGMainLoop
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import ctypes
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import ctypes.util
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version = "1.0.2"
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# Brief description of the operation of this program:
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#
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# This server announces itself as a Zeroconf service. Connecting
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# clients use the TLS protocol, with the unusual quirk that this
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# server program acts as a TLS "client" while the connecting clients
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# acts as a TLS "server". The clients (acting as a TLS "server") must
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# supply an OpenPGP certificate, and the fingerprint of this
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# certificate is used by this server to look up (in a list read from a
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# file at start time) which binary blob to give the client. No other
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# authentication or authorization is done by this server.
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logger = logging.Logger('mandos')
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syslogger = logging.handlers.SysLogHandler\
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
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address = "/dev/log")
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
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syslogger.setFormatter(logging.Formatter\
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('Mandos: %(levelname)s: %(message)s'))
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('%(levelname)s: %(message)s'))
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logger.addHandler(syslogger)
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console = logging.StreamHandler()
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console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
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' %(message)s'))
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logger.addHandler(console)
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class AvahiError(Exception):
83
def __init__(self, value):
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self.value = value
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super(AvahiError, self).__init__()
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def __str__(self):
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return repr(self.value)
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class AvahiServiceError(AvahiError):
90
pass
91
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class AvahiGroupError(AvahiError):
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pass
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class AvahiService(object):
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"""An Avahi (Zeroconf) service.
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Attributes:
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interface: integer; avahi.IF_UNSPEC or an interface index.
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Used to optionally bind to the specified interface.
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name: string; Example: 'Mandos'
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type: string; Example: '_mandos._tcp'.
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See <http://www.dns-sd.org/ServiceTypes.html>
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port: integer; what port to announce
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TXT: list of strings; TXT record for the service
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domain: string; Domain to publish on, default to .local if empty.
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host: string; Host to publish records for, default is localhost
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max_renames: integer; maximum number of renames
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rename_count: integer; counter so we only rename after collisions
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a sensible number of times
111
"""
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def __init__(self, interface = avahi.IF_UNSPEC, name = None,
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servicetype = None, port = None, TXT = None, domain = "",
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host = "", max_renames = 32768):
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self.interface = interface
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self.name = name
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self.type = servicetype
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self.port = port
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if TXT is None:
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self.TXT = []
121
else:
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self.TXT = TXT
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self.domain = domain
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self.host = host
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self.rename_count = 0
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self.max_renames = max_renames
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def rename(self):
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"""Derived from the Avahi example code"""
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if self.rename_count >= self.max_renames:
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logger.critical(u"No suitable Zeroconf service name found"
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u" after %i retries, exiting.",
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self.rename_count)
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raise AvahiServiceError("Too many renames")
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self.name = server.GetAlternativeServiceName(self.name)
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logger.info(u"Changing Zeroconf service name to %r ...",
136
str(self.name))
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syslogger.setFormatter(logging.Formatter\
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('Mandos (%s): %%(levelname)s:'
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' %%(message)s' % self.name))
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self.remove()
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self.add()
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self.rename_count += 1
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def remove(self):
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"""Derived from the Avahi example code"""
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if group is not None:
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group.Reset()
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def add(self):
148
"""Derived from the Avahi example code"""
149
global group
150
if group is None:
151
group = dbus.Interface\
152
(bus.get_object(avahi.DBUS_NAME,
153
server.EntryGroupNew()),
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avahi.DBUS_INTERFACE_ENTRY_GROUP)
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group.connect_to_signal('StateChanged',
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entry_group_state_changed)
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logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
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service.name, service.type)
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group.AddService(
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self.interface, # interface
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avahi.PROTO_INET6, # protocol
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dbus.UInt32(0), # flags
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self.name, self.type,
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self.domain, self.host,
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dbus.UInt16(self.port),
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avahi.string_array_to_txt_array(self.TXT))
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group.Commit()
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del syslogger
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# This variable is used to optionally bind to a specified interface.
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# It is a global variable to fit in with the other variables from the
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# Avahi example code.
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serviceInterface = avahi.IF_UNSPEC
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# From the Avahi example code:
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group = None # our entry group
90
serviceName = "Mandos"
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
92
servicePort = None # Not known at startup
93
serviceTXT = [] # TXT record for the service
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domain = "" # Domain to publish on, default to .local
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host = "" # Host to publish records for, default to localhost
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group = None #our entry group
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rename_count = 12 # Counter so we only rename after collisions a
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# sensible number of times
171
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# End of Avahi example code
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fingerprint: string (40 or 32 hexadecimal digits); used to
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uniquely identify the client
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secret: bytestring; sent verbatim (over TLS) to client
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host: string; available for use by the checker command
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created: datetime.datetime(); object creation, not client host
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last_checked_ok: datetime.datetime() or None if not yet checked OK
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timeout: datetime.timedelta(); How long from last_checked_ok
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until this client is invalid
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fqdn: string (FQDN); available for use by the checker command
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created: datetime.datetime()
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last_seen: datetime.datetime() or None if not yet seen
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timeout: datetime.timedelta(); How long from last_seen until
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this client is invalid
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interval: datetime.timedelta(); How often to start a new checker
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stop_hook: If set, called by stop() as stop_hook(self)
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checker: subprocess.Popen(); a running checker process used
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to see if the client lives.
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'None' if no process is running.
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Is None if no process is running.
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checker_initiator_tag: a gobject event source tag, or None
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stop_initiator_tag: - '' -
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checker_callback_tag: - '' -
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checker_command: string; External command which is run to check if
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client lives. %() expansions are done at
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client lives. %()s expansions are done at
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runtime with vars(self) as dict, so that for
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instance %(name)s can be used in the command.
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Private attibutes:
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_timeout: Real variable for 'timeout'
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_interval: Real variable for 'interval'
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_timeout_milliseconds: Used when calling gobject.timeout_add()
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_timeout_milliseconds: Used by gobject.timeout_add()
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_interval_milliseconds: - '' -
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"""
204
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def _set_timeout(self, timeout):
224
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interval = property(lambda self: self._interval,
225
153
_set_interval)
226
154
del _set_interval
227
def __init__(self, name = None, stop_hook=None, config=None):
228
"""Note: the 'checker' key in 'config' sets the
229
'checker_command' attribute and *not* the 'checker'
230
attribute."""
231
if config is None:
232
config = {}
155
def __init__(self, name=None, options=None, stop_hook=None,
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fingerprint=None, secret=None, secfile=None,
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fqdn=None, timeout=None, interval=-1, checker=None):
158
"""Note: the 'checker' argument sets the 'checker_command'
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attribute and not the 'checker' attribute.."""
233
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self.name = name
234
logger.debug(u"Creating client %r", self.name)
235
# Uppercase and remove spaces from fingerprint for later
236
# comparison purposes with return value from the fingerprint()
237
# function
238
self.fingerprint = config["fingerprint"].upper()\
239
.replace(u" ", u"")
240
logger.debug(u" Fingerprint: %s", self.fingerprint)
241
if "secret" in config:
242
self.secret = config["secret"].decode(u"base64")
243
elif "secfile" in config:
244
with closing(open(os.path.expanduser
245
(os.path.expandvars
246
(config["secfile"])))) \
247
as secfile:
248
self.secret = secfile.read()
161
# Uppercase and remove spaces from fingerprint
162
# for later comparison purposes with return value of
163
# the fingerprint() function
164
self.fingerprint = fingerprint.upper().replace(u" ", u"")
165
if secret:
166
self.secret = secret.decode(u"base64")
167
elif secfile:
168
sf = open(secfile)
169
self.secret = sf.read()
170
sf.close()
249
171
else:
250
raise TypeError(u"No secret or secfile for client %s"
251
% self.name)
252
self.host = config.get("host", "")
172
raise RuntimeError(u"No secret or secfile for client %s"
173
% self.name)
174
self.fqdn = fqdn # string
253
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self.created = datetime.datetime.now()
254
self.last_checked_ok = None
255
self.timeout = string_to_delta(config["timeout"])
256
self.interval = string_to_delta(config["interval"])
176
self.last_seen = None
177
if timeout is None:
178
self.timeout = options.timeout
179
else:
180
self.timeout = string_to_delta(timeout)
181
if interval == -1:
182
self.interval = options.interval
183
else:
184
self.interval = string_to_delta(interval)
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self.stop_hook = stop_hook
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self.checker = None
259
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self.checker_initiator_tag = None
260
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self.stop_initiator_tag = None
261
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self.checker_callback_tag = None
262
self.check_command = config["checker"]
190
self.check_command = checker
263
191
def start(self):
264
192
"""Start this client's checker and timeout hooks"""
265
193
# Schedule a new checker to be started an 'interval' from now,
275
203
self.stop)
276
204
def stop(self):
277
205
"""Stop this client.
278
The possibility that a client might be restarted is left open,
279
but not currently used."""
206
The possibility that this client might be restarted is left
207
open, but not currently used."""
280
208
# If this client doesn't have a secret, it is already stopped.
281
if hasattr(self, "secret") and self.secret:
282
logger.info(u"Stopping client %s", self.name)
209
if self.secret:
210
logger.debug(u"Stopping client %s", self.name)
283
211
self.secret = None
284
212
else:
285
213
return False
286
if getattr(self, "stop_initiator_tag", False):
214
if hasattr(self, "stop_initiator_tag") \
215
and self.stop_initiator_tag:
287
216
gobject.source_remove(self.stop_initiator_tag)
288
217
self.stop_initiator_tag = None
289
if getattr(self, "checker_initiator_tag", False):
218
if hasattr(self, "checker_initiator_tag") \
219
and self.checker_initiator_tag:
290
220
gobject.source_remove(self.checker_initiator_tag)
291
221
self.checker_initiator_tag = None
292
222
self.stop_checker()
299
229
self.stop()
300
230
def checker_callback(self, pid, condition):
301
231
"""The checker has completed, so take appropriate actions."""
232
now = datetime.datetime.now()
302
233
self.checker_callback_tag = None
303
234
self.checker = None
304
235
if os.WIFEXITED(condition) \
305
236
and (os.WEXITSTATUS(condition) == 0):
306
logger.info(u"Checker for %(name)s succeeded",
307
vars(self))
308
self.bump_timeout()
237
logger.debug(u"Checker for %(name)s succeeded",
238
vars(self))
239
self.last_seen = now
240
gobject.source_remove(self.stop_initiator_tag)
241
self.stop_initiator_tag = gobject.timeout_add\
242
(self._timeout_milliseconds,
243
self.stop)
309
244
elif not os.WIFEXITED(condition):
310
245
logger.warning(u"Checker for %(name)s crashed?",
311
246
vars(self))
312
247
else:
313
logger.info(u"Checker for %(name)s failed",
314
vars(self))
315
def bump_timeout(self):
316
"""Bump up the timeout for this client.
317
This should only be called when the client has been seen,
318
alive and well.
319
"""
320
self.last_checked_ok = datetime.datetime.now()
321
gobject.source_remove(self.stop_initiator_tag)
322
self.stop_initiator_tag = gobject.timeout_add\
323
(self._timeout_milliseconds, self.stop)
248
logger.debug(u"Checker for %(name)s failed",
249
vars(self))
324
250
def start_checker(self):
325
251
"""Start a new checker subprocess if one is not running.
326
252
If a checker already exists, leave it running and do
335
261
# is as it should be.
336
262
if self.checker is None:
337
263
try:
338
# In case check_command has exactly one % operator
339
command = self.check_command % self.host
264
command = self.check_command % self.fqdn
340
265
except TypeError:
341
# Escape attributes for the shell
342
266
escaped_attrs = dict((key, re.escape(str(val)))
343
267
for key, val in
344
268
vars(self).iteritems())
345
269
try:
346
270
command = self.check_command % escaped_attrs
347
271
except TypeError, error:
348
logger.error(u'Could not format string "%s":'
349
u' %s', self.check_command, error)
272
logger.critical(u'Could not format string "%s":'
273
u' %s', self.check_command, error)
350
274
return True # Try again later
351
275
try:
352
logger.info(u"Starting checker %r for %s",
353
command, self.name)
354
# We don't need to redirect stdout and stderr, since
355
# in normal mode, that is already done by daemon(),
356
# and in debug mode we don't want to. (Stdin is
357
# always replaced by /dev/null.)
358
self.checker = subprocess.Popen(command,
359
close_fds=True,
360
shell=True, cwd="/")
276
logger.debug(u"Starting checker %r for %s",
277
command, self.name)
278
self.checker = subprocess.\
279
Popen(command,
280
close_fds=True, shell=True,
281
cwd="/")
361
282
self.checker_callback_tag = gobject.child_watch_add\
362
283
(self.checker.pid,
363
284
self.checker_callback)
364
except OSError, error:
285
except subprocess.OSError, error:
365
286
logger.error(u"Failed to start subprocess: %s",
366
287
error)
367
288
# Re-run this periodically if run by gobject.timeout_add
371
292
if self.checker_callback_tag:
372
293
gobject.source_remove(self.checker_callback_tag)
373
294
self.checker_callback_tag = None
374
if getattr(self, "checker", None) is None:
295
if not hasattr(self, "checker") or self.checker is None:
375
296
return
376
logger.debug(u"Stopping checker for %(name)s", vars(self))
297
logger.debug("Stopping checker for %(name)s", vars(self))
377
298
try:
378
299
os.kill(self.checker.pid, signal.SIGTERM)
379
300
#os.sleep(0.5)
380
301
#if self.checker.poll() is None:
381
302
# os.kill(self.checker.pid, signal.SIGKILL)
382
303
except OSError, error:
383
if error.errno != errno.ESRCH: # No such process
304
if error.errno != errno.ESRCH:
384
305
raise
385
306
self.checker = None
386
def still_valid(self):
307
def still_valid(self, now=None):
387
308
"""Has the timeout not yet passed for this client?"""
388
now = datetime.datetime.now()
389
if self.last_checked_ok is None:
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
390
312
return now < (self.created + self.timeout)
391
313
else:
392
return now < (self.last_checked_ok + self.timeout)
314
return now < (self.last_seen + self.timeout)
393
315
394
316
395
317
def peer_certificate(session):
411
333
412
334
def fingerprint(openpgp):
413
335
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
336
# New empty GnuTLS certificate
337
crt = gnutls.library.types.gnutls_openpgp_crt_t()
338
gnutls.library.functions.gnutls_openpgp_crt_init\
339
(ctypes.byref(crt))
414
340
# New GnuTLS "datum" with the OpenPGP public key
415
341
datum = gnutls.library.types.gnutls_datum_t\
416
342
(ctypes.cast(ctypes.c_char_p(openpgp),
417
343
ctypes.POINTER(ctypes.c_ubyte)),
418
344
ctypes.c_uint(len(openpgp)))
419
# New empty GnuTLS certificate
420
crt = gnutls.library.types.gnutls_openpgp_crt_t()
421
gnutls.library.functions.gnutls_openpgp_crt_init\
422
(ctypes.byref(crt))
423
345
# Import the OpenPGP public key into the certificate
424
gnutls.library.functions.gnutls_openpgp_crt_import\
425
(crt, ctypes.byref(datum),
426
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
# Verify the self signature in the key
428
crtverify = ctypes.c_uint()
429
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
430
(crt, 0, ctypes.byref(crtverify))
431
if crtverify.value != 0:
432
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
433
raise gnutls.errors.CertificateSecurityError("Verify failed")
346
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
347
(crt,
348
ctypes.byref(datum),
349
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
434
350
# New buffer for the fingerprint
435
buf = ctypes.create_string_buffer(20)
436
buf_len = ctypes.c_size_t()
351
buffer = ctypes.create_string_buffer(20)
352
buffer_length = ctypes.c_size_t()
437
353
# Get the fingerprint from the certificate into the buffer
438
354
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
439
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
355
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
440
356
# Deinit the certificate
441
357
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
442
358
# Convert the buffer to a Python bytestring
443
fpr = ctypes.string_at(buf, buf_len.value)
359
fpr = ctypes.string_at(buffer, buffer_length.value)
444
360
# Convert the bytestring to hexadecimal notation
445
361
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
446
362
return hex_fpr
447
363
448
364
449
class TCP_handler(SocketServer.BaseRequestHandler, object):
365
class tcp_handler(SocketServer.BaseRequestHandler, object):
450
366
"""A TCP request handler class.
451
367
Instantiated by IPv6_TCPServer for each request to handle it.
452
368
Note: This will run in its own forked process."""
453
369
454
370
def handle(self):
455
logger.info(u"TCP connection from: %s",
456
unicode(self.client_address))
457
session = gnutls.connection.ClientSession\
458
(self.request, gnutls.connection.X509Credentials())
459
460
line = self.request.makefile().readline()
461
logger.debug(u"Protocol version: %r", line)
462
try:
463
if int(line.strip().split()[0]) > 1:
464
raise RuntimeError
465
except (ValueError, IndexError, RuntimeError), error:
466
logger.error(u"Unknown protocol version: %s", error)
467
return
468
469
# Note: gnutls.connection.X509Credentials is really a generic
470
# GnuTLS certificate credentials object so long as no X.509
471
# keys are added to it. Therefore, we can use it here despite
472
# using OpenPGP certificates.
371
logger.debug(u"TCP connection from: %s",
372
unicode(self.client_address))
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
473
376
474
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
475
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
476
379
# "+DHE-DSS"))
477
# Use a fallback default, since this MUST be set.
478
priority = self.server.settings.get("priority", "NORMAL")
380
priority = "SECURE256"
381
479
382
gnutls.library.functions.gnutls_priority_set_direct\
480
(session._c_object, priority, None)
383
(session._c_object, priority, None);
481
384
482
385
try:
483
386
session.handshake()
484
387
except gnutls.errors.GNUTLSError, error:
485
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
486
389
# Do not run session.bye() here: the session is not
487
390
# established. Just abandon the request.
488
391
return
489
392
try:
490
393
fpr = fingerprint(peer_certificate(session))
491
394
except (TypeError, gnutls.errors.GNUTLSError), error:
492
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
493
396
session.bye()
494
397
return
495
398
logger.debug(u"Fingerprint: %s", fpr)
498
401
if c.fingerprint == fpr:
499
402
client = c
500
403
break
501
if not client:
502
logger.warning(u"Client not found for fingerprint: %s",
503
fpr)
504
session.bye()
505
return
506
404
# Have to check if client.still_valid(), since it is possible
507
405
# that the client timed out while establishing the GnuTLS
508
406
# session.
509
if not client.still_valid():
510
logger.warning(u"Client %(name)s is invalid",
511
vars(client))
407
if (not client) or (not client.still_valid()):
408
if client:
409
logger.debug(u"Client %(name)s is invalid",
410
vars(client))
411
else:
412
logger.debug(u"Client not found for fingerprint: %s",
413
fpr)
512
414
session.bye()
513
415
return
514
## This won't work here, since we're in a fork.
515
# client.bump_timeout()
516
416
sent_size = 0
517
417
while sent_size < len(client.secret):
518
418
sent = session.send(client.secret[sent_size:])
523
423
session.bye()
524
424
525
425
526
class IPv6_TCPServer(SocketServer.ForkingMixIn,
527
SocketServer.TCPServer, object):
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
528
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
529
428
Attributes:
530
settings: Server settings
429
options: Command line options
531
430
clients: Set() of Client objects
532
enabled: Boolean; whether this server is activated yet
533
431
"""
534
432
address_family = socket.AF_INET6
535
433
def __init__(self, *args, **kwargs):
536
if "settings" in kwargs:
537
self.settings = kwargs["settings"]
538
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
539
437
if "clients" in kwargs:
540
438
self.clients = kwargs["clients"]
541
439
del kwargs["clients"]
542
self.enabled = False
543
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
440
return super(type(self), self).__init__(*args, **kwargs)
544
441
def server_bind(self):
545
442
"""This overrides the normal server_bind() function
546
443
to bind to an interface if one was specified, and also NOT to
547
444
bind to an address or port if they were not specified."""
548
if self.settings["interface"]:
549
# 25 is from /usr/include/asm-i486/socket.h
550
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
445
if self.options.interface:
446
if not hasattr(socket, "SO_BINDTODEVICE"):
447
# From /usr/include/asm-i486/socket.h
448
socket.SO_BINDTODEVICE = 25
551
449
try:
552
450
self.socket.setsockopt(socket.SOL_SOCKET,
553
SO_BINDTODEVICE,
554
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
555
453
except socket.error, error:
556
454
if error[0] == errno.EPERM:
557
logger.error(u"No permission to"
558
u" bind to interface %s",
559
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
560
458
else:
561
459
raise error
562
460
# Only bind(2) the socket if we really need to.
565
463
in6addr_any = "::"
566
464
self.server_address = (in6addr_any,
567
465
self.server_address[1])
568
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
569
467
self.server_address = (self.server_address[0],
570
468
0)
571
# if self.settings["interface"]:
572
# self.server_address = (self.server_address[0],
573
# 0, # port
574
# 0, # flowinfo
575
# if_nametoindex
576
# (self.settings
577
# ["interface"]))
578
return super(IPv6_TCPServer, self).server_bind()
579
def server_activate(self):
580
if self.enabled:
581
return super(IPv6_TCPServer, self).server_activate()
582
def enable(self):
583
self.enabled = True
469
return super(type(self), self).server_bind()
584
470
585
471
586
472
def string_to_delta(interval):
596
482
datetime.timedelta(1)
597
483
>>> string_to_delta(u'1w')
598
484
datetime.timedelta(7)
599
>>> string_to_delta('5m 30s')
600
datetime.timedelta(0, 330)
601
485
"""
602
timevalue = datetime.timedelta(0)
603
for s in interval.split():
604
try:
605
suffix = unicode(s[-1])
606
value = int(s[:-1])
607
if suffix == u"d":
608
delta = datetime.timedelta(value)
609
elif suffix == u"s":
610
delta = datetime.timedelta(0, value)
611
elif suffix == u"m":
612
delta = datetime.timedelta(0, 0, 0, 0, value)
613
elif suffix == u"h":
614
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
615
elif suffix == u"w":
616
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
617
else:
618
raise ValueError
619
except (ValueError, IndexError):
486
try:
487
suffix=unicode(interval[-1])
488
value=int(interval[:-1])
489
if suffix == u"d":
490
delta = datetime.timedelta(value)
491
elif suffix == u"s":
492
delta = datetime.timedelta(0, value)
493
elif suffix == u"m":
494
delta = datetime.timedelta(0, 0, 0, 0, value)
495
elif suffix == u"h":
496
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
497
elif suffix == u"w":
498
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
499
else:
620
500
raise ValueError
621
timevalue += delta
622
return timevalue
501
except (ValueError, IndexError):
502
raise ValueError
503
return delta
504
505
506
def add_service():
507
"""Derived from the Avahi example code"""
508
global group, serviceName, serviceType, servicePort, serviceTXT, \
509
domain, host
510
if group is None:
511
group = dbus.Interface(
512
bus.get_object( avahi.DBUS_NAME,
513
server.EntryGroupNew()),
514
avahi.DBUS_INTERFACE_ENTRY_GROUP)
515
group.connect_to_signal('StateChanged',
516
entry_group_state_changed)
517
logger.debug(u"Adding service '%s' of type '%s' ...",
518
serviceName, serviceType)
519
520
group.AddService(
521
serviceInterface, # interface
522
avahi.PROTO_INET6, # protocol
523
dbus.UInt32(0), # flags
524
serviceName, serviceType,
525
domain, host,
526
dbus.UInt16(servicePort),
527
avahi.string_array_to_txt_array(serviceTXT))
528
group.Commit()
529
530
531
def remove_service():
532
"""From the Avahi example code"""
533
global group
534
535
if not group is None:
536
group.Reset()
623
537
624
538
625
539
def server_state_changed(state):
626
540
"""Derived from the Avahi example code"""
627
541
if state == avahi.SERVER_COLLISION:
628
logger.error(u"Zeroconf server name collision")
629
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
630
544
elif state == avahi.SERVER_RUNNING:
631
service.add()
545
add_service()
632
546
633
547
634
548
def entry_group_state_changed(state, error):
635
549
"""Derived from the Avahi example code"""
636
logger.debug(u"Avahi state change: %i", state)
550
global serviceName, server, rename_count
551
552
logger.debug(u"state change: %i", state)
637
553
638
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
639
logger.debug(u"Zeroconf service established.")
555
logger.debug(u"Service established.")
640
556
elif state == avahi.ENTRY_GROUP_COLLISION:
641
logger.warning(u"Zeroconf service name collision.")
642
service.rename()
557
558
rename_count = rename_count - 1
559
if rename_count > 0:
560
name = server.GetAlternativeServiceName(name)
561
logger.warning(u"Service name collision, "
562
u"changing name to '%s' ...", name)
563
remove_service()
564
add_service()
565
566
else:
567
logger.error(u"No suitable service name found after %i"
568
u" retries, exiting.", n_rename)
569
killme(1)
643
570
elif state == avahi.ENTRY_GROUP_FAILURE:
644
logger.critical(u"Avahi: Error in group state changed %s",
645
unicode(error))
646
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
647
575
648
576
def if_nametoindex(interface):
649
"""Call the C function if_nametoindex(), or equivalent"""
650
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
651
578
try:
652
if_nametoindex = ctypes.cdll.LoadLibrary\
653
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
654
581
except (OSError, AttributeError):
655
582
if "struct" not in sys.modules:
656
583
import struct
657
584
if "fcntl" not in sys.modules:
658
585
import fcntl
659
def if_nametoindex(interface):
660
"Get an interface index the hard way, i.e. using fcntl()"
661
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
662
with closing(socket.socket()) as s:
663
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
664
struct.pack("16s16x", interface))
665
interface_index = struct.unpack("I", ifreq[16:20])[0]
666
return interface_index
667
return if_nametoindex(interface)
668
669
670
def daemon(nochdir = False, noclose = False):
586
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
587
s = socket.socket()
588
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
589
struct.pack("16s16x", interface))
590
s.close()
591
interface_index = struct.unpack("I", ifreq[16:20])[0]
592
return interface_index
593
594
595
def daemon(nochdir, noclose):
671
596
"""See daemon(3). Standard BSD Unix function.
672
597
This should really exist as os.daemon, but it doesn't (yet)."""
673
598
if os.fork():
675
600
os.setsid()
676
601
if not nochdir:
677
602
os.chdir("/")
678
if os.fork():
679
sys.exit()
680
603
if not noclose:
681
604
# Close all standard open file descriptors
682
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
683
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
684
607
raise OSError(errno.ENODEV,
685
608
"/dev/null not a character device")
690
613
os.close(null)
691
614
692
615
616
def killme(status = 0):
617
logger.debug("Stopping server with exit status %d", status)
618
exitstatus = status
619
if main_loop_started:
620
main_loop.quit()
621
else:
622
sys.exit(status)
623
624
693
625
def main():
694
parser = OptionParser(version = "%%prog %s" % version)
626
global exitstatus
627
exitstatus = 0
628
global main_loop_started
629
main_loop_started = False
630
631
parser = OptionParser()
695
632
parser.add_option("-i", "--interface", type="string",
696
metavar="IF", help="Bind to interface IF")
697
parser.add_option("-a", "--address", type="string",
633
default=None, metavar="IF",
634
help="Bind to interface IF")
635
parser.add_option("-a", "--address", type="string", default=None,
698
636
help="Address to listen for requests on")
699
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
700
638
help="Port number to receive requests on")
639
parser.add_option("--timeout", type="string", # Parsed later
640
default="1h",
641
help="Amount of downtime allowed for clients")
642
parser.add_option("--interval", type="string", # Parsed later
643
default="5m",
644
help="How often to check that a client is up")
701
645
parser.add_option("--check", action="store_true", default=False,
702
646
help="Run self-test")
703
parser.add_option("--debug", action="store_true",
704
help="Debug mode; run in foreground and log to"
705
" terminal")
706
parser.add_option("--priority", type="string", help="GnuTLS"
707
" priority string (see GnuTLS documentation)")
708
parser.add_option("--servicename", type="string", metavar="NAME",
709
help="Zeroconf service name")
710
parser.add_option("--configdir", type="string",
711
default="/etc/mandos", metavar="DIR",
712
help="Directory to search for configuration"
713
" files")
714
options = parser.parse_args()[0]
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
649
(options, args) = parser.parse_args()
715
650
716
651
if options.check:
717
652
import doctest
718
653
doctest.testmod()
719
654
sys.exit()
720
655
721
# Default values for config file for server-global settings
722
server_defaults = { "interface": "",
723
"address": "",
724
"port": "",
725
"debug": "False",
726
"priority":
727
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
728
"servicename": "Mandos",
729
}
730
731
# Parse config file for server-global settings
732
server_config = ConfigParser.SafeConfigParser(server_defaults)
733
del server_defaults
734
server_config.read(os.path.join(options.configdir, "mandos.conf"))
735
# Convert the SafeConfigParser object to a dict
736
server_settings = server_config.defaults()
737
# Use getboolean on the boolean config option
738
server_settings["debug"] = server_config.getboolean\
739
("DEFAULT", "debug")
740
del server_config
741
742
# Override the settings from the config file with command line
743
# options, if set.
744
for option in ("interface", "address", "port", "debug",
745
"priority", "servicename", "configdir"):
746
value = getattr(options, option)
747
if value is not None:
748
server_settings[option] = value
749
del options
750
# Now we have our good server settings in "server_settings"
751
752
debug = server_settings["debug"]
753
754
if not debug:
755
syslogger.setLevel(logging.WARNING)
756
console.setLevel(logging.WARNING)
757
758
if server_settings["servicename"] != "Mandos":
759
syslogger.setFormatter(logging.Formatter\
760
('Mandos (%s): %%(levelname)s:'
761
' %%(message)s'
762
% server_settings["servicename"]))
763
764
# Parse config file with clients
765
client_defaults = { "timeout": "1h",
766
"interval": "5m",
767
"checker": "fping -q -- %(host)s",
768
"host": "",
769
}
770
client_config = ConfigParser.SafeConfigParser(client_defaults)
771
client_config.read(os.path.join(server_settings["configdir"],
772
"clients.conf"))
773
774
clients = Set()
775
tcp_server = IPv6_TCPServer((server_settings["address"],
776
server_settings["port"]),
777
TCP_handler,
778
settings=server_settings,
779
clients=clients)
780
pidfilename = "/var/run/mandos.pid"
781
try:
782
pidfile = open(pidfilename, "w")
783
except IOError, error:
784
logger.error("Could not open file %r", pidfilename)
785
786
uid = 65534
787
gid = 65534
788
try:
789
uid = pwd.getpwnam("mandos").pw_uid
790
except KeyError:
791
try:
792
uid = pwd.getpwnam("nobody").pw_uid
793
except KeyError:
794
pass
795
try:
796
gid = pwd.getpwnam("mandos").pw_gid
797
except KeyError:
798
try:
799
gid = pwd.getpwnam("nogroup").pw_gid
800
except KeyError:
801
pass
802
try:
803
os.setuid(uid)
804
os.setgid(gid)
805
except OSError, error:
806
if error[0] != errno.EPERM:
807
raise error
808
809
global service
810
service = AvahiService(name = server_settings["servicename"],
811
servicetype = "_mandos._tcp", )
812
if server_settings["interface"]:
813
service.interface = if_nametoindex\
814
(server_settings["interface"])
656
# Parse the time arguments
657
try:
658
options.timeout = string_to_delta(options.timeout)
659
except ValueError:
660
parser.error("option --timeout: Unparseable time")
661
try:
662
options.interval = string_to_delta(options.interval)
663
except ValueError:
664
parser.error("option --interval: Unparseable time")
665
666
# Parse config file
667
defaults = { "checker": "fping -q -- %%(fqdn)s" }
668
client_config = ConfigParser.SafeConfigParser(defaults)
669
#client_config.readfp(open("global.conf"), "global.conf")
670
client_config.read("mandos-clients.conf")
815
671
816
672
global main_loop
817
673
global bus
820
676
DBusGMainLoop(set_as_default=True )
821
677
main_loop = gobject.MainLoop()
822
678
bus = dbus.SystemBus()
823
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
824
avahi.DBUS_PATH_SERVER),
825
avahi.DBUS_INTERFACE_SERVER)
679
server = dbus.Interface(
680
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
681
avahi.DBUS_INTERFACE_SERVER )
826
682
# End of Avahi example code
827
683
684
debug = options.debug
685
686
if debug:
687
console = logging.StreamHandler()
688
# console.setLevel(logging.DEBUG)
689
console.setFormatter(logging.Formatter\
690
('%(levelname)s: %(message)s'))
691
logger.addHandler(console)
692
del console
693
694
clients = Set()
828
695
def remove_from_clients(client):
829
696
clients.remove(client)
830
697
if not clients:
831
logger.critical(u"No clients left, exiting")
832
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
833
700
834
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
835
702
stop_hook = remove_from_clients,
836
config
837
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
838
705
for section in client_config.sections()))
839
if not clients:
840
logger.critical(u"No clients defined")
841
sys.exit(1)
842
843
if debug:
844
# Redirect stdin so all checkers get /dev/null
845
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
846
os.dup2(null, sys.stdin.fileno())
847
if null > 2:
848
os.close(null)
849
else:
850
# No console logging
851
logger.removeHandler(console)
852
# Close all input and output, do double fork, etc.
853
daemon()
854
855
try:
856
pid = os.getpid()
857
pidfile.write(str(pid) + "\n")
858
pidfile.close()
859
del pidfile
860
except IOError:
861
logger.error(u"Could not write to file %r with PID %d",
862
pidfilename, pid)
863
except NameError:
864
# "pidfile" was never created
865
pass
866
del pidfilename
706
707
if not debug:
708
daemon(False, False)
867
709
868
710
def cleanup():
869
711
"Cleanup function; run on exit"
883
725
884
726
if not debug:
885
727
signal.signal(signal.SIGINT, signal.SIG_IGN)
886
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
887
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
728
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
729
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
888
730
889
731
for client in clients:
890
732
client.start()
891
733
892
tcp_server.enable()
893
tcp_server.server_activate()
894
895
# Find out what port we got
896
service.port = tcp_server.socket.getsockname()[1]
897
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
898
u" scope_id %d" % tcp_server.socket.getsockname())
899
900
#service.interface = tcp_server.socket.getsockname()[3]
901
902
try:
903
# From the Avahi example code
904
server.connect_to_signal("StateChanged", server_state_changed)
905
try:
906
server_state_changed(server.GetState())
907
except dbus.exceptions.DBusException, error:
908
logger.critical(u"DBusException: %s", error)
909
sys.exit(1)
910
# End of Avahi example code
911
912
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
913
lambda *args, **kwargs:
914
tcp_server.handle_request\
915
(*args[2:], **kwargs) or True)
916
917
logger.debug(u"Starting main loop")
734
tcp_server = IPv6_TCPServer((options.address, options.port),
735
tcp_handler,
736
options=options,
737
clients=clients)
738
# Find out what random port we got
739
global servicePort
740
servicePort = tcp_server.socket.getsockname()[1]
741
logger.debug(u"Now listening on port %d", servicePort)
742
743
if options.interface is not None:
744
global serviceInterface
745
serviceInterface = if_nametoindex(options.interface)
746
747
# From the Avahi example code
748
server.connect_to_signal("StateChanged", server_state_changed)
749
try:
750
server_state_changed(server.GetState())
751
except dbus.exceptions.DBusException, error:
752
logger.critical(u"DBusException: %s", error)
753
killme(1)
754
# End of Avahi example code
755
756
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
757
lambda *args, **kwargs:
758
tcp_server.handle_request(*args[2:],
759
**kwargs) or True)
760
try:
761
logger.debug("Starting main loop")
762
main_loop_started = True
918
763
main_loop.run()
919
except AvahiError, error:
920
logger.critical(u"AvahiError: %s" + unicode(error))
921
sys.exit(1)
922
764
except KeyboardInterrupt:
923
765
if debug:
924
766
print
767
768
sys.exit(exitstatus)
925
769
926
770
if __name__ == '__main__':
927
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0