mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-24 23:26:43 +00:00
682 lines
27 KiB
Python
682 lines
27 KiB
Python
"""
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This module contains classes and functions to implement and manage
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a node for Tahoe-LAFS.
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"""
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import datetime
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import os.path
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import re
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import types
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import ConfigParser
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import tempfile
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from io import BytesIO
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from base64 import b32decode, b32encode
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from twisted.internet import reactor
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from twisted.python import log as twlog
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from twisted.application import service
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from foolscap.api import Tub, app_versions
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import foolscap.logging.log
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from allmydata import get_package_versions, get_package_versions_string
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from allmydata.util import log
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from allmydata.util import fileutil, iputil
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from allmydata.util.assertutil import _assert
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from allmydata.util.fileutil import abspath_expanduser_unicode
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from allmydata.util.encodingutil import get_filesystem_encoding, quote_output
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from allmydata.util import configutil
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from allmydata.util import i2p_provider, tor_provider
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def _common_config_sections():
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return {
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"connections": (
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"tcp",
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),
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"node": (
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"log_gatherer.furl",
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"nickname",
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"reveal-ip-address",
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"tempdir",
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"timeout.disconnect",
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"timeout.keepalive",
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"tub.location",
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"tub.port",
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"web.port",
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"web.static",
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),
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"i2p": (
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"enabled",
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"i2p.configdir",
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"i2p.executable",
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"launch",
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"sam.port",
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"dest",
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"dest.port",
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"dest.private_key_file",
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),
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"tor": (
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"control.port",
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"enabled",
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"launch",
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"socks.port",
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"tor.executable",
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"onion",
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"onion.local_port",
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"onion.external_port",
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"onion.private_key_file",
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),
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}
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# Add our application versions to the data that Foolscap's LogPublisher
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# reports.
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for thing, things_version in get_package_versions().iteritems():
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app_versions.add_version(thing, str(things_version))
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# group 1 will be addr (dotted quad string), group 3 if any will be portnum (string)
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ADDR_RE = re.compile("^([1-9][0-9]*\.[1-9][0-9]*\.[1-9][0-9]*\.[1-9][0-9]*)(:([1-9][0-9]*))?$")
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def formatTimeTahoeStyle(self, when):
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"""
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Format the given (UTC) timestamp in the way Tahoe-LAFS expects it,
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for example: 2007-10-12 00:26:28.566Z
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:param when: UTC POSIX timestamp
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:type when: float
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:returns: datetime.datetime
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"""
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d = datetime.datetime.utcfromtimestamp(when)
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if d.microsecond:
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return d.isoformat(" ")[:-3]+"Z"
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return d.isoformat(" ") + ".000Z"
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PRIV_README = """
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This directory contains files which contain private data for the Tahoe node,
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such as private keys. On Unix-like systems, the permissions on this directory
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are set to disallow users other than its owner from reading the contents of
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the files. See the 'configuration.rst' documentation file for details."""
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class _None: # used as a marker in get_config()
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pass
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class MissingConfigEntry(Exception):
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""" A required config entry was not found. """
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class OldConfigError(Exception):
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""" An obsolete config file was found. See
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docs/historical/configuration.rst. """
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def __str__(self):
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return ("Found pre-Tahoe-LAFS-v1.3 configuration file(s):\n"
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"%s\n"
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"See docs/historical/configuration.rst."
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% "\n".join([quote_output(fname) for fname in self.args[0]]))
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class OldConfigOptionError(Exception):
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"""Indicate that outdated configuration options are being used."""
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pass
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class UnescapedHashError(Exception):
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"""Indicate that a configuration entry contains an unescaped '#' character."""
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def __str__(self):
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return ("The configuration entry %s contained an unescaped '#' character."
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% quote_output("[%s]%s = %s" % self.args))
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class PrivacyError(Exception):
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"""reveal-IP-address = false, but the node is configured in such a way
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that the IP address could be revealed"""
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def read_config(basedir, portnumfile, generated_files=[], _valid_config_sections=None):
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basedir = abspath_expanduser_unicode(unicode(basedir))
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if _valid_config_sections is None:
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_valid_config_sections = _common_config_sections
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# complain if there's bad stuff in the config dir
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_error_about_old_config_files(basedir, generated_files)
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# canonicalize the portnum file
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portnumfile = os.path.join(basedir, portnumfile)
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# (try to) read the main config file
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config_fname = os.path.join(basedir, "tahoe.cfg")
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parser = ConfigParser.SafeConfigParser()
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try:
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parser = configutil.get_config(config_fname)
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except EnvironmentError:
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if os.path.exists(config_fname):
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raise
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configutil.validate_config(config_fname, parser, _valid_config_sections())
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return _Config(parser, portnumfile, config_fname)
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def config_from_string(config_str, portnumfile):
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parser = ConfigParser.SafeConfigParser()
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parser.readfp(BytesIO(config_str))
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return _Config(parser, portnumfile, '<in-memory>')
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def _error_about_old_config_files(basedir, generated_files):
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"""
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If any old configuration files are detected, raise
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OldConfigError.
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"""
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oldfnames = set()
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old_names = [
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'nickname', 'webport', 'keepalive_timeout', 'log_gatherer.furl',
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'disconnect_timeout', 'advertised_ip_addresses', 'introducer.furl',
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'helper.furl', 'key_generator.furl', 'stats_gatherer.furl',
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'no_storage', 'readonly_storage', 'sizelimit',
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'debug_discard_storage', 'run_helper'
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]
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for fn in generated_files:
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old_names.remove(fn)
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for name in old_names:
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fullfname = os.path.join(basedir, name)
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if os.path.exists(fullfname):
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oldfnames.add(fullfname)
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if oldfnames:
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e = OldConfigError(oldfnames)
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twlog.msg(e)
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raise e
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class _Config(object):
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"""
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FIXME better name
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pulling out all the 'config' stuff from Node, so we can pass it in
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as a helper instead.
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"""
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def __init__(self, configparser, portnum_fname, config_fname):
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# XXX I think this portnumfile thing is just legacy?
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self.portnum_fname = portnum_fname
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self._config_fname = config_fname
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self.config = configparser
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nickname_utf8 = self.get_config("node", "nickname", "<unspecified>")
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self.nickname = nickname_utf8.decode("utf-8")
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assert type(self.nickname) is unicode
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def validate(self, valid_config_sections):
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configutil.validate_config(self._config_fname, self.config, valid_config_sections)
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def read_config(self):
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try:
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self.config = configutil.get_config(self.config_fname)
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except EnvironmentError:
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if os.path.exists(self.config_fname):
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raise
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def get_config(self, section, option, default=_None, boolean=False):
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try:
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if boolean:
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return self.config.getboolean(section, option)
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item = self.config.get(section, option)
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if option.endswith(".furl") and self._contains_unescaped_hash(item):
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raise UnescapedHashError(section, option, item)
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return item
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except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
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if default is _None:
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raise MissingConfigEntry(
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"{} is missing the [{}]{} entry".format(
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quote_output(self._config_fname),
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section,
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option,
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)
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)
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return default
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@staticmethod
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def _contains_unescaped_hash(item):
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characters = iter(item)
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for c in characters:
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if c == '\\':
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characters.next()
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elif c == '#':
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return True
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return False
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class Node(service.MultiService):
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"""
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This class implements common functionality of both Client nodes and Introducer nodes.
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"""
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NODETYPE = "unknown NODETYPE"
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CERTFILE = "node.pem"
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GENERATED_FILES = []
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def __init__(self, config, basedir=u"."):
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"""
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Initialize the node with the given configuration. It's base directory
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is the current directory by default.
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"""
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service.MultiService.__init__(self)
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# ideally, this would only be in _Config (or otherwise abstracted)
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self.basedir = abspath_expanduser_unicode(unicode(basedir))
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# XXX don't write files in ctor!
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fileutil.make_dirs(os.path.join(self.basedir, "private"), 0700)
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with open(os.path.join(self.basedir, "private", "README"), "w") as f:
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f.write(PRIV_README)
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self.config = config
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self.get_config = config.get_config # XXX stopgap
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self.nickname = config.nickname # XXX stopgap
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self.init_tempdir()
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self.check_privacy()
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self.create_log_tub()
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self.logSource = "Node"
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self.setup_logging()
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self.create_i2p_provider()
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self.create_tor_provider()
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self.init_connections()
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self.set_tub_options()
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self.create_main_tub()
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self.create_control_tub()
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self.log("Node constructed. " + get_package_versions_string())
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iputil.increase_rlimits()
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def init_tempdir(self):
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"""
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Initialize/create a directory for temporary files.
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"""
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tempdir_config = self.config.get_config("node", "tempdir", "tmp").decode('utf-8')
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tempdir = abspath_expanduser_unicode(tempdir_config, base=self.basedir)
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if not os.path.exists(tempdir):
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fileutil.make_dirs(tempdir)
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tempfile.tempdir = tempdir
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# this should cause twisted.web.http (which uses
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# tempfile.TemporaryFile) to put large request bodies in the given
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# directory. Without this, the default temp dir is usually /tmp/,
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# which is frequently too small.
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temp_fd, test_name = tempfile.mkstemp()
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_assert(os.path.dirname(test_name) == tempdir, test_name, tempdir)
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os.close(temp_fd)
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def check_privacy(self):
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self._reveal_ip = self.config.get_config("node", "reveal-IP-address", True,
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boolean=True)
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def create_i2p_provider(self):
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self._i2p_provider = i2p_provider.Provider(self.basedir, self.config, reactor)
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self._i2p_provider.check_dest_config()
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self._i2p_provider.setServiceParent(self)
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def create_tor_provider(self):
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self._tor_provider = tor_provider.Provider(self.basedir, self.config, reactor)
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self._tor_provider.check_onion_config()
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self._tor_provider.setServiceParent(self)
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def _make_tcp_handler(self):
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# this is always available
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from foolscap.connections.tcp import default
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return default()
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def _make_tor_handler(self):
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return self._tor_provider.get_tor_handler()
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def _make_i2p_handler(self):
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return self._i2p_provider.get_i2p_handler()
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def init_connections(self):
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# We store handlers for everything. None means we were unable to
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# create that handler, so hints which want it will be ignored.
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handlers = self._foolscap_connection_handlers = {
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"tcp": self._make_tcp_handler(),
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"tor": self._make_tor_handler(),
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"i2p": self._make_i2p_handler(),
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}
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self.log(format="built Foolscap connection handlers for: %(known_handlers)s",
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known_handlers=sorted([k for k, v in handlers.items() if v]),
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facility="tahoe.node", umid="PuLh8g")
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# then we remember the default mappings from tahoe.cfg
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self._default_connection_handlers = {"tor": "tor", "i2p": "i2p"}
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tcp_handler_name = self.config.get_config("connections", "tcp", "tcp").lower()
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if tcp_handler_name == "disabled":
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self._default_connection_handlers["tcp"] = None
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else:
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if tcp_handler_name not in handlers:
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raise ValueError("'tahoe.cfg [connections] tcp='"
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" uses unknown handler type '%s'"
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% tcp_handler_name)
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if not handlers[tcp_handler_name]:
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raise ValueError("'tahoe.cfg [connections] tcp=' uses "
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"unavailable/unimportable handler type '%s'. "
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"Please pip install tahoe-lafs[%s] to fix."
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% (tcp_handler_name, tcp_handler_name))
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self._default_connection_handlers["tcp"] = tcp_handler_name
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if not self._reveal_ip:
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if self._default_connection_handlers.get("tcp") == "tcp":
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raise PrivacyError("tcp = tcp, must be set to 'tor' or 'disabled'")
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def set_tub_options(self):
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self.tub_options = {
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"logLocalFailures": True,
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"logRemoteFailures": True,
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"expose-remote-exception-types": False,
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"accept-gifts": False,
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}
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# see #521 for a discussion of how to pick these timeout values.
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keepalive_timeout_s = self.config.get_config("node", "timeout.keepalive", "")
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if keepalive_timeout_s:
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self.tub_options["keepaliveTimeout"] = int(keepalive_timeout_s)
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disconnect_timeout_s = self.config.get_config("node", "timeout.disconnect", "")
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if disconnect_timeout_s:
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# N.B.: this is in seconds, so use "1800" to get 30min
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self.tub_options["disconnectTimeout"] = int(disconnect_timeout_s)
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def _create_tub(self, handler_overrides={}, **kwargs):
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# Create a Tub with the right options and handlers. It will be
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# ephemeral unless the caller provides certFile=
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tub = Tub(**kwargs)
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for (name, value) in self.tub_options.items():
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tub.setOption(name, value)
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handlers = self._default_connection_handlers.copy()
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handlers.update(handler_overrides)
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tub.removeAllConnectionHintHandlers()
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for hint_type, handler_name in handlers.items():
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handler = self._foolscap_connection_handlers.get(handler_name)
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if handler:
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tub.addConnectionHintHandler(hint_type, handler)
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return tub
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def _convert_tub_port(self, s):
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if re.search(r'^\d+$', s):
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return "tcp:%d" % int(s)
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return s
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def get_tub_portlocation(self, cfg_tubport, cfg_location):
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# return None, or tuple of (port, location)
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tubport_disabled = False
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if cfg_tubport is not None:
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cfg_tubport = cfg_tubport.strip()
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if cfg_tubport == "":
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raise ValueError("tub.port must not be empty")
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if cfg_tubport == "disabled":
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tubport_disabled = True
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location_disabled = False
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if cfg_location is not None:
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cfg_location = cfg_location.strip()
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if cfg_location == "":
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raise ValueError("tub.location must not be empty")
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if cfg_location == "disabled":
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location_disabled = True
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if tubport_disabled and location_disabled:
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return None
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if tubport_disabled and not location_disabled:
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raise ValueError("tub.port is disabled, but not tub.location")
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if location_disabled and not tubport_disabled:
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raise ValueError("tub.location is disabled, but not tub.port")
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if cfg_tubport is None:
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# For 'tub.port', tahoe.cfg overrides the individual file on
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# disk. So only read self._portnumfile if tahoe.cfg doesn't
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# provide a value.
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if os.path.exists(self.config.portnum_fname):
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file_tubport = fileutil.read(self.config.portnum_fname).strip()
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tubport = self._convert_tub_port(file_tubport)
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else:
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tubport = "tcp:%d" % iputil.allocate_tcp_port()
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fileutil.write_atomically(self.config.portnum_fname, tubport + "\n",
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mode="")
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else:
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tubport = self._convert_tub_port(cfg_tubport)
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if cfg_location is None:
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cfg_location = "AUTO"
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local_portnum = None # needed to hush lgtm.com static analyzer
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# Replace the location "AUTO", if present, with the detected local
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# addresses. Don't probe for local addresses unless necessary.
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split_location = cfg_location.split(",")
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if "AUTO" in split_location:
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if not self._reveal_ip:
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raise PrivacyError("tub.location uses AUTO")
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local_addresses = iputil.get_local_addresses_sync()
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# tubport must be like "tcp:12345" or "tcp:12345:morestuff"
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local_portnum = int(tubport.split(":")[1])
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new_locations = []
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for loc in split_location:
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if loc == "AUTO":
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new_locations.extend(["tcp:%s:%d" % (ip, local_portnum)
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for ip in local_addresses])
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else:
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if not self._reveal_ip:
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# Legacy hints are "host:port". We use Foolscap's utility
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# function to convert all hints into the modern format
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# ("tcp:host:port") because that's what the receiving
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# client will probably do. We test the converted hint for
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# TCP-ness, but publish the original hint because that
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# was the user's intent.
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from foolscap.connections.tcp import convert_legacy_hint
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converted_hint = convert_legacy_hint(loc)
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hint_type = converted_hint.split(":")[0]
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if hint_type == "tcp":
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raise PrivacyError("tub.location includes tcp: hint")
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new_locations.append(loc)
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location = ",".join(new_locations)
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return tubport, location
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def create_main_tub(self):
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certfile = os.path.join(self.basedir, "private", self.CERTFILE)
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self.tub = self._create_tub(certFile=certfile)
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self.nodeid = b32decode(self.tub.tubID.upper()) # binary format
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self.write_config("my_nodeid", b32encode(self.nodeid).lower() + "\n")
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self.short_nodeid = b32encode(self.nodeid).lower()[:8] # for printing
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cfg_tubport = self.config.get_config("node", "tub.port", None)
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|
cfg_location = self.config.get_config("node", "tub.location", None)
|
|
portlocation = self.get_tub_portlocation(cfg_tubport, cfg_location)
|
|
if portlocation:
|
|
tubport, location = portlocation
|
|
for port in tubport.split(","):
|
|
if port in ("0", "tcp:0"):
|
|
raise ValueError("tub.port cannot be 0: you must choose")
|
|
if port == "listen:i2p":
|
|
# the I2P provider will read its section of tahoe.cfg and
|
|
# return either a fully-formed Endpoint, or a descriptor
|
|
# that will create one, so we don't have to stuff all the
|
|
# options into the tub.port string (which would need a lot
|
|
# of escaping)
|
|
port_or_endpoint = self._i2p_provider.get_listener()
|
|
elif port == "listen:tor":
|
|
port_or_endpoint = self._tor_provider.get_listener()
|
|
else:
|
|
port_or_endpoint = port
|
|
self.tub.listenOn(port_or_endpoint)
|
|
self.tub.setLocation(location)
|
|
self._tub_is_listening = True
|
|
self.log("Tub location set to %s" % (location,))
|
|
# the Tub is now ready for tub.registerReference()
|
|
else:
|
|
self._tub_is_listening = False
|
|
self.log("Tub is not listening")
|
|
|
|
self.tub.setServiceParent(self)
|
|
|
|
def create_control_tub(self):
|
|
# the control port uses a localhost-only ephemeral Tub, with no
|
|
# control over the listening port or location
|
|
self.control_tub = Tub()
|
|
portnum = iputil.allocate_tcp_port()
|
|
port = "tcp:%d:interface=127.0.0.1" % portnum
|
|
location = "tcp:127.0.0.1:%d" % portnum
|
|
self.control_tub.listenOn(port)
|
|
self.control_tub.setLocation(location)
|
|
self.log("Control Tub location set to %s" % (location,))
|
|
self.control_tub.setServiceParent(self)
|
|
|
|
def create_log_tub(self):
|
|
# The logport uses a localhost-only ephemeral Tub, with no control
|
|
# over the listening port or location. This might change if we
|
|
# discover a compelling reason for it in the future (e.g. being able
|
|
# to use "flogtool tail" against a remote server), but for now I
|
|
# think we can live without it.
|
|
self.log_tub = Tub()
|
|
portnum = iputil.allocate_tcp_port()
|
|
port = "tcp:%d:interface=127.0.0.1" % portnum
|
|
location = "tcp:127.0.0.1:%d" % portnum
|
|
self.log_tub.listenOn(port)
|
|
self.log_tub.setLocation(location)
|
|
self.log("Log Tub location set to %s" % (location,))
|
|
self.log_tub.setServiceParent(self)
|
|
|
|
def get_app_versions(self):
|
|
# TODO: merge this with allmydata.get_package_versions
|
|
return dict(app_versions.versions)
|
|
|
|
def get_config_from_file(self, name, required=False):
|
|
"""Get the (string) contents of a config file, or None if the file
|
|
did not exist. If required=True, raise an exception rather than
|
|
returning None. Any leading or trailing whitespace will be stripped
|
|
from the data."""
|
|
fn = os.path.join(self.basedir, name)
|
|
try:
|
|
return fileutil.read(fn).strip()
|
|
except EnvironmentError:
|
|
if not required:
|
|
return None
|
|
raise
|
|
|
|
def write_private_config(self, name, value):
|
|
"""Write the (string) contents of a private config file (which is a
|
|
config file that resides within the subdirectory named 'private'), and
|
|
return it.
|
|
"""
|
|
privname = os.path.join(self.basedir, "private", name)
|
|
with open(privname, "w") as f:
|
|
f.write(value)
|
|
|
|
def get_private_config(self, name, default=_None):
|
|
"""Read the (string) contents of a private config file (which is a
|
|
config file that resides within the subdirectory named 'private'),
|
|
and return it. Return a default, or raise an error if one was not
|
|
given.
|
|
"""
|
|
privname = os.path.join(self.basedir, "private", name)
|
|
try:
|
|
return fileutil.read(privname).strip()
|
|
except EnvironmentError:
|
|
if os.path.exists(privname):
|
|
raise
|
|
if default is _None:
|
|
raise MissingConfigEntry("The required configuration file %s is missing."
|
|
% (quote_output(privname),))
|
|
return default
|
|
|
|
def get_or_create_private_config(self, name, default=_None):
|
|
"""Try to get the (string) contents of a private config file (which
|
|
is a config file that resides within the subdirectory named
|
|
'private'), and return it. Any leading or trailing whitespace will be
|
|
stripped from the data.
|
|
|
|
If the file does not exist, and default is not given, report an error.
|
|
If the file does not exist and a default is specified, try to create
|
|
it using that default, and then return the value that was written.
|
|
If 'default' is a string, use it as a default value. If not, treat it
|
|
as a zero-argument callable that is expected to return a string.
|
|
"""
|
|
privname = os.path.join(self.basedir, "private", name)
|
|
try:
|
|
value = fileutil.read(privname)
|
|
except EnvironmentError:
|
|
if os.path.exists(privname):
|
|
raise
|
|
if default is _None:
|
|
raise MissingConfigEntry("The required configuration file %s is missing."
|
|
% (quote_output(privname),))
|
|
if isinstance(default, basestring):
|
|
value = default
|
|
else:
|
|
value = default()
|
|
fileutil.write(privname, value)
|
|
return value.strip()
|
|
|
|
def write_config(self, name, value, mode="w"):
|
|
"""Write a string to a config file."""
|
|
fn = os.path.join(self.basedir, name)
|
|
try:
|
|
fileutil.write(fn, value, mode)
|
|
except EnvironmentError, e:
|
|
self.log("Unable to write config file '%s'" % fn)
|
|
self.log(e)
|
|
|
|
def startService(self):
|
|
# Note: this class can be started and stopped at most once.
|
|
self.log("Node.startService")
|
|
# Record the process id in the twisted log, after startService()
|
|
# (__init__ is called before fork(), but startService is called
|
|
# after). Note that Foolscap logs handle pid-logging by itself, no
|
|
# need to send a pid to the foolscap log here.
|
|
twlog.msg("My pid: %s" % os.getpid())
|
|
try:
|
|
os.chmod("twistd.pid", 0644)
|
|
except EnvironmentError:
|
|
pass
|
|
|
|
service.MultiService.startService(self)
|
|
self.log("%s running" % self.NODETYPE)
|
|
twlog.msg("%s running" % self.NODETYPE)
|
|
|
|
def stopService(self):
|
|
self.log("Node.stopService")
|
|
return service.MultiService.stopService(self)
|
|
|
|
def shutdown(self):
|
|
"""Shut down the node. Returns a Deferred that fires (with None) when
|
|
it finally stops kicking."""
|
|
self.log("Node.shutdown")
|
|
return self.stopService()
|
|
|
|
def setup_logging(self):
|
|
# we replace the formatTime() method of the log observer that
|
|
# twistd set up for us, with a method that uses our preferred
|
|
# timestamp format.
|
|
for o in twlog.theLogPublisher.observers:
|
|
# o might be a FileLogObserver's .emit method
|
|
if type(o) is type(self.setup_logging): # bound method
|
|
ob = o.im_self
|
|
if isinstance(ob, twlog.FileLogObserver):
|
|
newmeth = types.UnboundMethodType(formatTimeTahoeStyle, ob, ob.__class__)
|
|
ob.formatTime = newmeth
|
|
# TODO: twisted >2.5.0 offers maxRotatedFiles=50
|
|
|
|
lgfurl_file = os.path.join(self.basedir, "private", "logport.furl").encode(get_filesystem_encoding())
|
|
if os.path.exists(lgfurl_file):
|
|
os.remove(lgfurl_file)
|
|
self.log_tub.setOption("logport-furlfile", lgfurl_file)
|
|
lgfurl = self.config.get_config("node", "log_gatherer.furl", "")
|
|
if lgfurl:
|
|
# this is in addition to the contents of log-gatherer-furlfile
|
|
self.log_tub.setOption("log-gatherer-furl", lgfurl)
|
|
self.log_tub.setOption("log-gatherer-furlfile",
|
|
os.path.join(self.basedir, "log_gatherer.furl"))
|
|
|
|
incident_dir = os.path.join(self.basedir, "logs", "incidents")
|
|
foolscap.logging.log.setLogDir(incident_dir.encode(get_filesystem_encoding()))
|
|
twlog.msg("Foolscap logging initialized")
|
|
twlog.msg("Note to developers: twistd.log does not receive very much.")
|
|
twlog.msg("Use 'flogtool tail -c NODEDIR/private/logport.furl' instead")
|
|
twlog.msg("and read docs/logging.rst")
|
|
|
|
def log(self, *args, **kwargs):
|
|
return log.msg(*args, **kwargs)
|
|
|
|
def add_service(self, s):
|
|
s.setServiceParent(self)
|
|
return s
|