Added well-known downloading
This commit is contained in:
parent
e7e3ddd20d
commit
2be5e6e66e
58
README.md
58
README.md
@ -1,2 +1,58 @@
|
||||
# exclude_badExits
|
||||
# https://github.com/nusenu/noContactInfo_Exit_Excluder
|
||||
# https://github.com/TheSmashy/TorExitRelayExclude
|
||||
|
||||
This extends nusenu's basic idea of using the stem library to
|
||||
dynamically exclude nodes that are likely to be bad by putting them
|
||||
on the ExcludeNodes or ExcludeExitNodes setting of a running Tor.
|
||||
* https://github.com/nusenu/noContactInfo_Exit_Excluder
|
||||
* https://github.com/TheSmashy/TorExitRelayExclude
|
||||
|
||||
The basic cut is to exclude Exit nodes that do not have a contact.
|
||||
That can be extended to nodes that do not have an email in the contact etc.
|
||||
|
||||
But there's a problem, and your Tor notice.log will tell you about it:
|
||||
you could exclude the nodes needed to access hidden services etc.
|
||||
So we need to add to the process the concept of a whitelist.
|
||||
In addition, we may have our own blacklist of nodes we want to exclude.
|
||||
|
||||
So we make two files that are structured in YAML:
|
||||
```
|
||||
/etc/tor/torrc-goodnodes.yaml
|
||||
Nodes:
|
||||
IntroductionPoints:
|
||||
- $NODEFINGERPRINT
|
||||
...
|
||||
By default all sections of the goodnodes.yaml are used as a whitelist.
|
||||
|
||||
/etc/tor/torrc-badnodes.yaml
|
||||
Nodes:
|
||||
ExcludeExitNodes:
|
||||
BadExit:
|
||||
# $0000000000000000000000000000000000000007
|
||||
```
|
||||
That part requires [PyYAML](https://pyyaml.org/wiki/PyYAML)
|
||||
https://github.com/yaml/pyyaml/
|
||||
|
||||
Right now only the ExcludeExitNodes section is used by we may add ExcludeNodes
|
||||
later, and by default all sub-sections of the badnodes.yaml are used as a
|
||||
ExcludeExitNodes but it can be customized with the lWanted commandline arg.
|
||||
|
||||
The original idea has also been extended to add different conditions for
|
||||
exclusion: the ```--contact``` commandline arg is a comma sep list of conditions:
|
||||
* Empty - no contact info
|
||||
* NoEmail - no @ sign in the contact',
|
||||
More may be added later.
|
||||
|
||||
Because you don't want to exclude the introduction points to any onion
|
||||
you want to connect to, ```--white_onions``` should whitelist the
|
||||
introduction points to a comma sep list of onions, but is
|
||||
currently broken in stem 1.8.0: see:
|
||||
* https://github.com/torproject/stem/issues/96
|
||||
* https://gitlab.torproject.org/legacy/trac/-/issues/25417
|
||||
|
||||
```--bad_output``` will write the torrc configuration to a file.
|
||||
|
||||
```--details_output``` will write the lookup URLs of the excluded nodes to a file
|
||||
|
||||
For usage, do ```python3 exclude_badExits.py --help`
|
||||
|
||||
|
@ -11,7 +11,8 @@ on the ExcludeNodes or ExcludeExitNodes setting of a running Tor.
|
||||
|
||||
The basic cut is to exclude Exit nodes that do not have a contact.
|
||||
That can be extended to nodes that do not have an email in the contact etc.
|
||||
|
||||
"""
|
||||
"""
|
||||
But there's a problem, and your Tor notice.log will tell you about it:
|
||||
you could exclude the nodes needed to access hidden services or
|
||||
directorues. So we need to add to the process the concept of a whitelist.
|
||||
@ -53,24 +54,35 @@ currently broken in stem 1.8.0: see:
|
||||
* https://github.com/torproject/stem/issues/96
|
||||
* https://gitlab.torproject.org/legacy/trac/-/issues/25417
|
||||
|
||||
```--bad_output``` will write the torrc configuration to a file.
|
||||
```--bad_output``` will write the torrc ExcludeNodes configuration to a file.
|
||||
|
||||
```--details_output``` will write the lookup URLs of the excluded nodes to a file
|
||||
|
||||
```--proof_output``` will write the contact info as a ciiss dictionary
|
||||
to a YAML file. If the proof is uri-rsa, the well-known file of fingerprints
|
||||
is downloaded and the fingerprints are added to the on the 'fps' field
|
||||
of that fingerprint entry of the YAML dictionary. This file is read at the
|
||||
beginning of the program to start with a trust database, and only new
|
||||
relays are added to the dictionary. The 'fps' field is emptied if the
|
||||
host fails to provide the well-known file. You can expect it to take
|
||||
an hour or two the first time this is run: >700 domains.
|
||||
|
||||
For usage, do ```python3 exclude_badExits.py --help`
|
||||
|
||||
"""
|
||||
|
||||
import sys
|
||||
from stem.control import Controller
|
||||
from stem.util.tor_tools import is_valid_fingerprint
|
||||
|
||||
import os
|
||||
import getpass
|
||||
import re
|
||||
import time
|
||||
import argparse
|
||||
from io import StringIO
|
||||
|
||||
from stem.control import Controller
|
||||
from stem.connection import IncorrectPassword
|
||||
from stem.util.tor_tools import is_valid_fingerprint
|
||||
try:
|
||||
import yaml
|
||||
except:
|
||||
@ -83,16 +95,18 @@ try:
|
||||
# https://pypi.org/project/coloredlogs/
|
||||
except ImportError as e:
|
||||
coloredlogs = False
|
||||
from trustor_poc import lDownloadUrlFps
|
||||
|
||||
global LOG
|
||||
import logging
|
||||
LOG = logging.getLogger()
|
||||
|
||||
aTRUST_DB = {}
|
||||
sDETAILS_URL = "https://metrics.torproject.org/rs.html#details/"
|
||||
# You can call this while bootstrapping
|
||||
|
||||
def oMakeController(sSock='/run/tor/control', port=9051):
|
||||
if os.path.exists(sSock):
|
||||
def oMakeController(sSock='', port=9051):
|
||||
if sSock and os.path.exists(sSock):
|
||||
controller = Controller.from_socket_file(path=sSock)
|
||||
else:
|
||||
controller = Controller.from_port(port=port)
|
||||
@ -148,23 +162,85 @@ def lIntroductionPoints(lOnions):
|
||||
l += [introduction_point.address]
|
||||
return l
|
||||
|
||||
# memory?
|
||||
lINTS = ['ciissversion', 'uplinkbw', 'signingkeylifetime']
|
||||
lBOOLS = ['dnssec', 'dnsqname', 'aesni', 'autoupdate', 'dnslocalrootzone'
|
||||
'sandbox', 'offlinemasterkey']
|
||||
def aVerifyContact(a, fp, timeout=20, host='127.0.0.1', port=9050):
|
||||
for elt in lINTS:
|
||||
if elt in a:
|
||||
a[elt] = int(a[elt])
|
||||
for elt in lBOOLS:
|
||||
if elt in a:
|
||||
if a[elt] in ['y','yes', 'true', 'True']:
|
||||
a[elt] = True
|
||||
else:
|
||||
a[elt] = False
|
||||
|
||||
# just stick fp in for now
|
||||
a.update({'fps': [fp]})
|
||||
# test the url for fps and add it to the array
|
||||
if 'proof' not in a:
|
||||
# only support uri for now
|
||||
LOG.warn(f"{fp} 'proof' not in {list(a.keys())}")
|
||||
return a
|
||||
if a['proof'] not in ['uri-rsa']:
|
||||
# only support uri for now
|
||||
LOG.warn(f"{fp} proof={a['proof']} not supported yet")
|
||||
return a
|
||||
if 'url' not in a:
|
||||
LOG.warn(f"{fp} 'proof' is 'uri-rsa' but url not in {list(a.keys())}")
|
||||
return a
|
||||
if a['url'].startswith('http:'):
|
||||
a['url'] = 'https:' +a['url'][5:]
|
||||
elif not a['url'].startswith('https:'):
|
||||
a['url'] = 'https:' +a['url']
|
||||
domain = a['url'][8:]
|
||||
LOG.debug(f"{len(list(a.keys()))} contact fields for {fp}")
|
||||
LOG.info(f"Downloading from {domain} for {fp}")
|
||||
try:
|
||||
l = lDownloadUrlFps(domain, timeout=20, host=host, port=port)
|
||||
except Exception as e:
|
||||
LOG.exception(f"Error downloading from {domain} for {fp} {e}")
|
||||
# should we put it's FPs from TRUST_DB on the ExcludeExitNodes?
|
||||
a['fps'] = []
|
||||
else:
|
||||
if not l:
|
||||
LOG.warn(f"Downloading from {domain} failed for {fp}")
|
||||
a['fps'] = []
|
||||
else:
|
||||
a['fps'] = l
|
||||
return a
|
||||
|
||||
def aParseContact(contact, fp):
|
||||
contact = str(contact, 'UTF-8')
|
||||
l = [line for line in contact.strip().replace('"', '').split(' ')
|
||||
if ':' in line]
|
||||
LOG.debug(f"{fp} {len(l)} fields")
|
||||
s = f'"{fp}":\n'
|
||||
s += '\n'.join([f" {line}\"".replace(':',': \"', 1)
|
||||
for line in l])
|
||||
oFd = StringIO(s)
|
||||
a = yaml.safe_load(oFd)
|
||||
return a
|
||||
|
||||
def oMainArgparser(_=None):
|
||||
# 'Mode: 0=chat 1=chat+audio 2=chat+audio+video default: 0'
|
||||
if not os.path.exists('/proc/sys/net/ipv6'):
|
||||
bIpV6 = 'False'
|
||||
else:
|
||||
bIpV6 = 'True'
|
||||
lIpV6Choices=[bIpV6, 'False']
|
||||
|
||||
parser = argparse.ArgumentParser(add_help=True)
|
||||
parser = argparse.ArgumentParser(add_help=True,
|
||||
epilog=__doc__)
|
||||
parser.add_argument('--proxy_host', '--proxy-host', type=str,
|
||||
default='127.0.0.1',
|
||||
help='proxy host')
|
||||
parser.add_argument('--proxy_port', '--proxy-port', default=9051, type=int,
|
||||
parser.add_argument('--proxy_port', '--proxy-port', default=9050, type=int,
|
||||
help='proxy control port')
|
||||
parser.add_argument('--proxy_ctl', '--proxy-ctl',
|
||||
default='/run/tor/control', type=str,
|
||||
help='control socket - takes precedence over proxy_port')
|
||||
default='/run/tor/control',
|
||||
type=str,
|
||||
help='control socket - or port')
|
||||
parser.add_argument('--timeout', default=20, type=int,
|
||||
help='proxy download timeout')
|
||||
|
||||
parser.add_argument('--good_nodes', type=str,
|
||||
default='/etc/tor/torrc-goodnodes.yaml',
|
||||
help="Yaml file of good nodes that should not be excluded")
|
||||
@ -187,10 +263,13 @@ def oMainArgparser(_=None):
|
||||
help="Write the torrc configuration to a file")
|
||||
parser.add_argument('--details_output', type=str, default='',
|
||||
help="Write the lookup URLs of the excluded nodes to a file")
|
||||
parser.add_argument('--proof_output', type=str, default='',
|
||||
help="Write the proof data of the included nodes to a YAML file")
|
||||
return parser
|
||||
|
||||
def iMain(lArgs):
|
||||
global oTOX_OARGS
|
||||
global aTRUST_DB
|
||||
parser = oMainArgparser()
|
||||
oArgs = parser.parse_args(lArgs)
|
||||
|
||||
@ -200,14 +279,25 @@ def iMain(lArgs):
|
||||
force=True)
|
||||
logging.basicConfig(**aKw)
|
||||
logging.getLogger('stem').setLevel(oArgs.log_level)
|
||||
|
||||
controller = oMakeController(oArgs.proxy_ctl, oArgs.proxy_port)
|
||||
|
||||
sFile = oArgs.proof_output
|
||||
if sFile and os.path.exists(sFile):
|
||||
with open(sFile, 'rt') as oFd:
|
||||
aTRUST_DB = yaml.safe_load(oFd)
|
||||
|
||||
if oArgs.proxy_ctl.startswith('/') or os.path.exists(oArgs.proxy_ctl):
|
||||
controller = oMakeController(sSock=oArgs.proxy_ctl)
|
||||
else:
|
||||
port =int(oArgs.proxy_ctl)
|
||||
controller = oMakeController(port=port)
|
||||
|
||||
elt = controller.get_conf('UseMicrodescriptors')
|
||||
if elt != '0' :
|
||||
LOG.error('"UseMicrodescriptors 0" is required in your /etc/tor/torrc. Exiting.')
|
||||
return 2
|
||||
|
||||
LOG.warn('"UseMicrodescriptors 0" is required in your /etc/tor/torrc. Exiting.')
|
||||
controller.set_conf('UseMicrodescriptors', 0)
|
||||
# does it work dynamically?
|
||||
# return 2
|
||||
|
||||
percent = i = 0
|
||||
# You can call this while boostrapping
|
||||
while percent < 100 and i < oArgs.wait_boot:
|
||||
@ -225,7 +315,7 @@ def iMain(lArgs):
|
||||
LOG.info(f'lYamlGoodNodes {len(lGood)}')
|
||||
|
||||
if oArgs.white_onions:
|
||||
l = lIntroductionPoints(oArgs.white_onions.split(,))
|
||||
l = lIntroductionPoints(oArgs.white_onions.split(','))
|
||||
lGood += l
|
||||
|
||||
relays = controller.get_server_descriptors()
|
||||
@ -243,30 +333,63 @@ def iMain(lArgs):
|
||||
else:
|
||||
oFd = None
|
||||
|
||||
lProofUriFps = []
|
||||
aProofUri = {}
|
||||
lConds = oArgs.contact.split(',')
|
||||
for relay in relays:
|
||||
if not relay.exit_policy.is_exiting_allowed(): continue
|
||||
if not is_valid_fingerprint(relay.fingerprint):
|
||||
LOG.warn('Invalid Fingerprint: %s' % relay.fingerprint)
|
||||
continue
|
||||
|
||||
if relay.fingerprint in aTRUST_DB:
|
||||
if aTRUST_DB[relay.fingerprint]['fps']:
|
||||
lProofUriFps += aTRUST_DB[relay.fingerprint]['fps']
|
||||
|
||||
if relay.fingerprint in lProofUriFps:
|
||||
# we already have it.
|
||||
continue
|
||||
if relay.contact and b'proof:uri-rsa' in relay.contact.lower():
|
||||
a = aParseContact(relay.contact, relay.fingerprint)
|
||||
if not a: continue
|
||||
b = aVerifyContact(list(a.values())[0], relay.fingerprint,
|
||||
timeout=oArgs.timeout,
|
||||
host=oArgs.proxy_host,
|
||||
port=oArgs.proxy_port)
|
||||
if not b:
|
||||
continue
|
||||
if 'fps' in b and b['fps'] and relay.fingerprint in b['fps']:
|
||||
lProofUriFps += b['fps']
|
||||
aProofUri[relay.fingerprint] = b
|
||||
if ('Empty' in lConds and not relay.contact) or \
|
||||
('NoEmail' in lConds and relay.contact and not b'@' in relay.contact):
|
||||
if is_valid_fingerprint(relay.fingerprint):
|
||||
exit_excludelist.append(relay.fingerprint)
|
||||
if oFd:
|
||||
oFd.write(sDETAILS_URL +relay.fingerprint +"\n")
|
||||
else:
|
||||
LOG.warn('Invalid Fingerprint: %s' % relay.fingerprint)
|
||||
if oFd:
|
||||
LOG.info(f"Wrote details URLs to {oArgs.details_output}")
|
||||
oFd.close()
|
||||
|
||||
exit_excludelist.append(relay.fingerprint)
|
||||
if oFd:
|
||||
oFd.write(sDETAILS_URL +relay.fingerprint +"\n")
|
||||
|
||||
exit_excludelist = list(set(exit_excludelist).difference(set(lGood)))
|
||||
LOG.info(f'ExcludeExitNodes {len(exit_excludelist)} net bad exit nodes')
|
||||
controller.set_conf('ExcludeExitNodes', exit_excludelist)
|
||||
elt = controller.get_conf('ExcludeExitNodes')
|
||||
if oArgs.bad_output:
|
||||
with open(oArgs.bad_output, 'wt') as oFd:
|
||||
oFd.write(f"ExcludeExitNodes {','.join(exit_excludelist)}\n")
|
||||
with open(oArgs.bad_output, 'wt') as oFdE:
|
||||
oFdE.write(f"ExcludeExitNodes {','.join(exit_excludelist)}\n")
|
||||
LOG.info(f"Wrote tor configuration to {oArgs.bad_output}")
|
||||
if lProofUriFps:
|
||||
LOG.info(f'ExitNodes {len(lProofUriFps)} good exit nodes')
|
||||
controller.set_conf('ExitNodes', lProofUriFps)
|
||||
|
||||
if oFd:
|
||||
LOG.info(f"Wrote details URLs to {oArgs.details_output}")
|
||||
oFd.close()
|
||||
|
||||
if oArgs.proof_output:
|
||||
with open(oArgs.proof_output, 'wt') as oFdD:
|
||||
s = yaml.dump_all(aProofUri, indent=2, stream=None)
|
||||
oFdD.write(s +'\n')
|
||||
LOG.info(f"Wrote proof details to {oArgs.proof_output}")
|
||||
oFdD.close()
|
||||
|
||||
logging.getLogger('stem').setLevel(40)
|
||||
for elt in controller._event_listeners:
|
||||
controller.remove_event_listener(elt)
|
||||
@ -277,6 +400,9 @@ def iMain(lArgs):
|
||||
if __name__ == '__main__':
|
||||
try:
|
||||
i = iMain(sys.argv[1:])
|
||||
except IncorrectPassword as e:
|
||||
LOG.error(e)
|
||||
i = 1
|
||||
except Exception as e:
|
||||
LOG.exception(e)
|
||||
i = 1
|
||||
|
348
trustor_poc.py
Normal file
348
trustor_poc.py
Normal file
@ -0,0 +1,348 @@
|
||||
# -*- mode: python; indent-tabs-mode: nil; py-indent-offset: 4; coding: utf-8 -# -*- coding: utf-8 -*-
|
||||
|
||||
import os
|
||||
import sys
|
||||
from stem.control import Controller
|
||||
from stem.util.tor_tools import *
|
||||
from urllib.parse import urlparse
|
||||
import requests
|
||||
import datetime
|
||||
|
||||
try:
|
||||
from unbound import ub_ctx,RR_TYPE_TXT,RR_CLASS_IN
|
||||
except:
|
||||
ub_ctx = RR_TYPE_TXT = RR_CLASS_IN = None
|
||||
|
||||
global LOG
|
||||
import logging
|
||||
LOG = logging.getLogger()
|
||||
|
||||
# download this python library from
|
||||
# https://github.com/erans/torcontactinfoparser
|
||||
#sys.path.append('/home/....')
|
||||
try:
|
||||
from torcontactinfo import TorContactInfoParser
|
||||
except:
|
||||
TorContactInfoParser = None
|
||||
|
||||
# tor ControlPort IP
|
||||
controller_address = '127.0.0.1'
|
||||
|
||||
dnssec_DS_file = 'dnssec-root-trust'
|
||||
|
||||
# this is not the system wide /etc/resolv.conf
|
||||
# use dnscrypt-proxy to encrypt your DNS and route it via tor's SOCKSPort
|
||||
libunbound_resolv_file = 'resolv.conf'
|
||||
|
||||
# for now we support max_depth = 0 only
|
||||
# this PoC version has no support for recursion
|
||||
# https://github.com/nusenu/tor-relay-operator-ids-trust-information#trust-information-consumers
|
||||
supported_max_depths = ['0']
|
||||
|
||||
# https://github.com/nusenu/ContactInfo-Information-Sharing-Specification#ciissversion
|
||||
accepted_ciissversions = ['2']
|
||||
|
||||
# https://github.com/nusenu/ContactInfo-Information-Sharing-Specification#proof
|
||||
accepted_proof_types = ['uri-rsa','dns-rsa']
|
||||
|
||||
# https://stackoverflow.com/questions/2532053/validate-a-hostname-string
|
||||
# FIXME this check allows non-fqdn names
|
||||
def is_valid_hostname(hostname):
|
||||
if len(hostname) > 255:
|
||||
return False
|
||||
if hostname[-1] == ".":
|
||||
hostname = hostname[:-1] # strip exactly one dot from the right, if present
|
||||
allowed = re.compile("(?!-)[A-Z\d-]{1,63}(?<!-)$", re.IGNORECASE)
|
||||
return all(allowed.match(x) for x in hostname.split("."))
|
||||
|
||||
|
||||
def read_local_trust_config(trust_config='trust_config'):
|
||||
'''
|
||||
reads a local configuration file containing trusted domains
|
||||
and returns them in an array
|
||||
'''
|
||||
|
||||
result = []
|
||||
if (os.path.isfile(trust_config)):
|
||||
f = open(trust_config)
|
||||
for line in f:
|
||||
line = line.strip()
|
||||
if line[0] == '#':
|
||||
continue
|
||||
try:
|
||||
domain, max_depth = line.split(':')
|
||||
except:
|
||||
LOG.error('invalid trust config line detected: %s aborting!' % line)
|
||||
sys.exit(8)
|
||||
|
||||
if max_depth in supported_max_depths:
|
||||
if is_valid_hostname(domain) and domain not in result:
|
||||
result.append(domain)
|
||||
else:
|
||||
LOG.error('invalid duplicate domain in trust config file: %s: %s aborting!' % (trust_config, domain))
|
||||
sys.exit(9)
|
||||
else:
|
||||
LOG.error('unsupported max_depth value (%s) used, aborting!' % line)
|
||||
sys.exit(10)
|
||||
|
||||
return result
|
||||
else:
|
||||
LOG.error("trust config file %s missing, aborting!" % trust_config)
|
||||
sys.exit(11)
|
||||
|
||||
|
||||
def read_local_validation_cache(validation_cache_file, trusted_domains=[]):
|
||||
'''
|
||||
reads the local validation cache and returns all fingerprints in the cache
|
||||
for trusted domains
|
||||
|
||||
format of each entry in the cache:
|
||||
domain:fingerprint:prooftype:date
|
||||
'''
|
||||
|
||||
result = []
|
||||
if trusted_domains == []:
|
||||
return result
|
||||
if (os.path.isfile(validation_cache_file)):
|
||||
f = open(validation_cache_file)
|
||||
for line in f:
|
||||
line = line.strip()
|
||||
if line[0] == '#':
|
||||
continue
|
||||
try:
|
||||
domain, fingerprint, prooftype, dt = line.split(':')
|
||||
except:
|
||||
LOG.error('invalid trust cache entry detected: %s aborting!' % line)
|
||||
sys.exit(12)
|
||||
|
||||
if domain in trusted_domains:
|
||||
result.append(fingerprint)
|
||||
else:
|
||||
print('ignoring cached entry for untrusted domain %s' % domain)
|
||||
|
||||
else:
|
||||
print("Validation cache file not present. It will be created.")
|
||||
return result
|
||||
|
||||
def get_controller(address='127.0.0.1',port=9151,password=''):
|
||||
'''
|
||||
connects to a local tor client via the tor ControlPort
|
||||
and returns a controller that allows us to easily set specific tor
|
||||
configuration options or read tor relay ContactInfo strings for validation
|
||||
'''
|
||||
|
||||
try:
|
||||
#controller = Controller.from_socket_file(path=torsocketpath)
|
||||
controller = Controller.from_port(address=address, port=port)
|
||||
controller.authenticate(password=password)
|
||||
except Exception as e:
|
||||
LOG.error(f'Failed to connect to the tor process, {e}')
|
||||
sys.exit(1)
|
||||
|
||||
if not controller.is_set('UseMicrodescriptors'):
|
||||
LOG.error('"UseMicrodescriptors 0" is required in your torrc configuration. Exiting.')
|
||||
sys.exit(2)
|
||||
|
||||
return controller
|
||||
|
||||
def find_validation_candidates(controller, trusted_domains=[],validation_cache=[],accept_all=False):
|
||||
'''
|
||||
connect to a tor client via controlport and return a dict of all
|
||||
not yet validated fingerprints per trusted operators
|
||||
format:
|
||||
{ trusted_domain: { prooftype: [fingerprint, fingerprint, ...]} }
|
||||
|
||||
example content:
|
||||
{ 'emeraldonion.org' : { 'uri-rsa': ['044600FD968728A6F220D5347AD897F421B757C0', '09DCA3360179C6C8A5A20DDDE1C54662965EF1BA']}}
|
||||
'''
|
||||
|
||||
result = {}
|
||||
|
||||
try:
|
||||
relays = controller.get_server_descriptors()
|
||||
except:
|
||||
LOG.error('Failed to get relay descriptors via tor\'s ControlPort. Exiting.')
|
||||
sys.exit(3)
|
||||
|
||||
ci = TorContactInfoParser()
|
||||
|
||||
for relay in relays:
|
||||
if relay.contact:
|
||||
fingerprint = relay.fingerprint
|
||||
# skip fingerprints we have already successfully validated in the past
|
||||
# a future version would check the cache age as well
|
||||
if fingerprint in validation_cache:
|
||||
continue
|
||||
contactstring = relay.contact.decode('utf-8')
|
||||
parsed_ci = ci.parse(contactstring)
|
||||
if len(parsed_ci) > 0:
|
||||
if 'ciissversion' in parsed_ci and 'proof' in parsed_ci and 'url' in parsed_ci:
|
||||
prooftype = parsed_ci['proof']
|
||||
ciurl = parsed_ci['url']
|
||||
if parsed_ci['ciissversion'] in accepted_ciissversions and prooftype in accepted_proof_types:
|
||||
if ciurl.startswith('http://') or ciurl.startswith('https://'):
|
||||
try:
|
||||
domain=urlparse(ciurl).netloc
|
||||
except:
|
||||
LOG.warning('failed to parse domain %s' % ciurl)
|
||||
domain='error'
|
||||
continue
|
||||
else:
|
||||
domain=ciurl
|
||||
if not is_valid_hostname(domain):
|
||||
domain='error'
|
||||
continue
|
||||
# we can ignore relays that do not claim to be operated by a trusted operator
|
||||
# if we do not accept all
|
||||
if domain not in trusted_domains and not accept_all:
|
||||
continue
|
||||
if domain in result.keys():
|
||||
if prooftype in result[domain].keys():
|
||||
result[domain][prooftype].append(fingerprint)
|
||||
else:
|
||||
result[domain] = { prooftype : [fingerprint] }
|
||||
# mixed proof types are not allowd as per spec but we are not strict here
|
||||
LOG.warning('%s is using mixed prooftypes %s' % (domain, prooftype))
|
||||
else:
|
||||
result[domain] = {prooftype : [fingerprint]}
|
||||
return result
|
||||
|
||||
def lDownloadUrlFps(domain, timeout=20, host='127.0.0.1', port=9050):
|
||||
uri="https://"+domain+"/.well-known/tor-relay/rsa-fingerprint.txt"
|
||||
# socks proxy used for outbound web requests (for validation of proofs)
|
||||
proxy = {'https': 'socks5h://' +host +':' +str(port)}
|
||||
# we use this UA string when connecting to webservers to fetch rsa-fingerprint.txt proof files
|
||||
# https://nusenu.github.io/ContactInfo-Information-Sharing-Specification/#uri-rsa
|
||||
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0'}
|
||||
|
||||
LOG.debug("fetching %s...." % uri)
|
||||
try:
|
||||
head = requests.head(uri, timeout=timeout, proxies=proxy, headers=headers)
|
||||
except Exception as e:
|
||||
print("HTTP HEAD request failed for %s" % uri)
|
||||
print(e)
|
||||
head = None
|
||||
return []
|
||||
if head.status_code != 200:
|
||||
return []
|
||||
if not head.headers['Content-Type'].startswith('text/plain'):
|
||||
return []
|
||||
try:
|
||||
fullfile = requests.get(uri, proxies=proxy, timeout=10, headers=headers)
|
||||
except:
|
||||
print("HTTP GET request failed for %s" % uri)
|
||||
return []
|
||||
if fullfile.status_code != 200 or not fullfile.headers['Content-Type'].startswith('text/plain'):
|
||||
return []
|
||||
|
||||
#check for redirects (not allowed as per spec)
|
||||
if fullfile.url != uri:
|
||||
LOG.error('Redirect detected %s vs %s (final)' % (uri, fullfile.url))
|
||||
return []
|
||||
|
||||
well_known_content = [i.strip() for i in fullfile.text.upper().split('\n')]
|
||||
return well_known_content
|
||||
|
||||
def validate_proofs(candidates, validation_cache_file):
|
||||
'''
|
||||
This function takes the return value of find_validation_candidates()
|
||||
and validated them according to their proof type (uri-rsa, dns-rsa)
|
||||
and writes properly validated relay fingerprints to the local validation cache
|
||||
'''
|
||||
dt_utc = datetime.datetime.now(datetime.timezone.utc).date()
|
||||
|
||||
f = open(validation_cache_file, mode='a')
|
||||
count = 0
|
||||
|
||||
for domain in candidates.keys():
|
||||
for prooftype in candidates[domain].keys():
|
||||
if prooftype == 'uri-rsa':
|
||||
well_known_content = lDownloadUrlFps(domain, timeout=20, host='127.0.0.1', port=9050)
|
||||
for fingerprint in candidates[domain][prooftype]:
|
||||
if fingerprint in well_known_content:
|
||||
# write cache entry
|
||||
count += 1
|
||||
f.write('%s:%s:%s:%s\n' % (domain, fingerprint, prooftype, dt_utc))
|
||||
else:
|
||||
LOG.error('%s:%s:%s' % (fingerprint, domain, prooftype))
|
||||
elif prooftype == 'dns-rsa' and ub_ctx:
|
||||
for fingerprint in candidates[domain][prooftype]:
|
||||
fp_domain = fingerprint+'.'+domain
|
||||
if dns_validate(fp_domain):
|
||||
count += 1
|
||||
f.write('%s:%s:%s:%s\n' % (domain, fingerprint, prooftype, dt_utc))
|
||||
else:
|
||||
LOG.error('%s:%s:%s' % (fingerprint, domain, prooftype))
|
||||
f.close()
|
||||
LOG.info('successfully validated %s new (not yet validated before) relays' % count)
|
||||
|
||||
def dns_validate(domain):
|
||||
'''
|
||||
performs DNS TXT lookups and verifies the reply
|
||||
- is DNSSEC valid and
|
||||
- contains only a single TXT record
|
||||
- the DNS record contains a hardcoded string as per specification
|
||||
https://nusenu.github.io/ContactInfo-Information-Sharing-Specification/#dns-rsa
|
||||
'''
|
||||
if not ub_ctx: return False
|
||||
|
||||
ctx = ub_ctx()
|
||||
if (os.path.isfile(libunbound_resolv_file)):
|
||||
ctx.resolvconf(libunbound_resolv_file)
|
||||
else:
|
||||
LOG.error('libunbound resolv config file: "%s" is missing, aborting!' % libunbound_resolv_file)
|
||||
sys.exit(5)
|
||||
if (os.path.isfile(dnssec_DS_file)):
|
||||
ctx.add_ta_file(dnssec_DS_file)
|
||||
else:
|
||||
LOG.error('DNSSEC trust anchor file "%s" is missing, aborting!' % dnssec_DS_file)
|
||||
sys.exit(6)
|
||||
|
||||
status, result = ctx.resolve(domain, RR_TYPE_TXT, RR_CLASS_IN)
|
||||
if status == 0 and result.havedata:
|
||||
if len(result.rawdata) == 1 and result.secure:
|
||||
# ignore the first byte, it is the TXT length
|
||||
if result.data.as_raw_data()[0][1:] == b'we-run-this-tor-relay':
|
||||
return True
|
||||
return False
|
||||
|
||||
def configure_tor(controller, trusted_fingerprints, exitonly=True):
|
||||
'''
|
||||
takes the list of trusted fingerprints and configures a tor client
|
||||
to only use trusted relays in a certain position
|
||||
for now we only set exits.
|
||||
we refuse to set the configuration if there are less then 40 trusted relays
|
||||
'''
|
||||
|
||||
relay_count = len(trusted_fingerprints)
|
||||
|
||||
if relay_count < 41:
|
||||
print('Too few trusted relays (%s), aborting!' % relay_count)
|
||||
sys.exit(15)
|
||||
|
||||
try:
|
||||
controller.set_conf('ExitNodes', trusted_fingerprints)
|
||||
print('limited exits to %s relays' % relay_count)
|
||||
except Exception as e:
|
||||
print('Failed to set ExitNodes tor config to trusted relays')
|
||||
print(e)
|
||||
sys.exit(20)
|
||||
|
||||
if __name__ == '__main__':
|
||||
trust_config = 'trust_config'
|
||||
assert os.path.exists(trust_config)
|
||||
trusted_domains = read_local_trust_config(trust_config)
|
||||
|
||||
validation_cache_file = 'validation_cache'
|
||||
trusted_fingerprints = read_local_validation_cache(validation_cache_file,
|
||||
trusted_domains=trusted_domains)
|
||||
# tor ControlPort password
|
||||
controller_password=''
|
||||
controller = get_controller(address=controller_address,password=controller_password)
|
||||
|
||||
r = find_validation_candidates(controller,validation_cache=trusted_fingerprints,trusted_domains=trusted_domains)
|
||||
validate_proofs(r, validation_cache_file)
|
||||
|
||||
# refresh list with newly validated fingerprints
|
||||
trusted_fingerprints = read_local_validation_cache(trusted_domains=trusted_domains)
|
||||
configure_tor(controller, trusted_fingerprints)
|
Loading…
Reference in New Issue
Block a user