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import logging
import os
import sys
import time
import re
import json
logger = logging.getLogger(__name__)
class BasePlugin():
def __init__(self, src):
self.source = src
def lookup(self, token):
return None
class ReadOnlyTokenFile(BasePlugin):
# source is a token file with lines like
# token: host:port
# or a directory of such files
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._targets = None
def _load_targets(self):
if os.path.isdir(self.source):
cfg_files = [os.path.join(self.source, f) for
f in os.listdir(self.source)]
else:
cfg_files = [self.source]
self._targets = {}
index = 1
for f in cfg_files:
for line in [l.strip() for l in open(f).readlines()]:
if line and not line.startswith('#'):
try:
tok, target = re.split(':\s', line)
self._targets[tok] = target.strip().rsplit(':', 1)
except ValueError:
logger.error("Syntax error in %s on line %d" % (self.source, index))
index += 1
def lookup(self, token):
if self._targets is None:
self._load_targets()
if token in self._targets:
return self._targets[token]
else:
return None
# the above one is probably more efficient, but this one is
# more backwards compatible (although in most cases
# ReadOnlyTokenFile should suffice)
class TokenFile(ReadOnlyTokenFile):
# source is a token file with lines like
# token: host:port
# or a directory of such files
def lookup(self, token):
self._load_targets()
return super().lookup(token)
class BaseTokenAPI(BasePlugin):
# source is a url with a '%s' in it where the token
# should go
# we import things on demand so that other plugins
# in this file can be used w/o unnecessary dependencies
def process_result(self, resp):
host, port = resp.text.split(':')
port = port.encode('ascii','ignore')
return [ host, port ]
def lookup(self, token):
import requests
resp = requests.get(self.source % token)
if resp.ok:
return self.process_result(resp)
else:
return None
class JSONTokenApi(BaseTokenAPI):
# source is a url with a '%s' in it where the token
# should go
def process_result(self, resp):
resp_json = resp.json()
return (resp_json['host'], resp_json['port'])
class JWTTokenApi(BasePlugin):
# source is a JWT-token, with hostname and port included
# Both JWS as JWE tokens are accepted. With regards to JWE tokens, the key is re-used for both validation and decryption.
def lookup(self, token):
try:
from jwcrypto import jwt, jwk
import json
key = jwk.JWK()
try:
with open(self.source, 'rb') as key_file:
key_data = key_file.read()
except Exception as e:
logger.error("Error loading key file: %s" % str(e))
return None
try:
key.import_from_pem(key_data)
except:
try:
key.import_key(k=key_data.decode('utf-8'),kty='oct')
except:
logger.error('Failed to correctly parse key data!')
return None
try:
token = jwt.JWT(key=key, jwt=token)
parsed_header = json.loads(token.header)
if 'enc' in parsed_header:
# Token is encrypted, so we need to decrypt by passing the claims to a new instance
token = jwt.JWT(key=key, jwt=token.claims)
parsed = json.loads(token.claims)
if 'nbf' in parsed:
# Not Before is present, so we need to check it
if time.time() < parsed['nbf']:
logger.warning('Token can not be used yet!')
return None
if 'exp' in parsed:
# Expiration time is present, so we need to check it
if time.time() > parsed['exp']:
logger.warning('Token has expired!')
return None
return (parsed['host'], parsed['port'])
except Exception as e:
logger.error("Failed to parse token: %s" % str(e))
return None
except ImportError:
logger.error("package jwcrypto not found, are you sure you've installed it correctly?")
return None
class TokenRedis(BasePlugin):
"""Token plugin based on the Redis in-memory data store.
The token source is in the format:
host[:port[:db[:password]]]
where port, db and password are optional. If port or db are left empty
they will take its default value, ie. 6379 and 0 respectively.
If your redis server is using the default port (6379) then you can use:
my-redis-host
In case you need to authenticate with the redis server and you are using
the default database and port you can use:
my-redis-host:::verysecretpass
In the more general case you will use:
my-redis-host:6380:1:verysecretpass
The TokenRedis plugin expects the format of the target in one of these two
formats:
- JSON
{"host": "target-host:target-port"}
- Plain text
target-host:target-port
Prepare data with:
redis-cli set my-token '{"host": "127.0.0.1:5000"}'
Verify with:
redis-cli --raw get my-token
Spawn a test "server" using netcat
nc -l 5000 -v
Note: This Token Plugin depends on the 'redis' module, so you have
to install it before using this plugin:
pip install redis
"""
def __init__(self, src):
try:
import redis
except ImportError:
logger.error("Unable to load redis module")
sys.exit()
# Default values
self._port = 6379
self._db = 0
self._password = None
try:
fields = src.split(":")
if len(fields) == 1:
self._server = fields[0]
elif len(fields) == 2:
self._server, self._port = fields
if not self._port:
self._port = 6379
elif len(fields) == 3:
self._server, self._port, self._db = fields
if not self._port:
self._port = 6379
if not self._db:
self._db = 0
elif len(fields) == 4:
self._server, self._port, self._db, self._password = fields
if not self._port:
self._port = 6379
if not self._db:
self._db = 0
if not self._password:
self._password = None
else:
raise ValueError
self._port = int(self._port)
self._db = int(self._db)
logger.info("TokenRedis backend initilized (%s:%s)" %
(self._server, self._port))
except ValueError:
logger.error("The provided --token-source='%s' is not in the "
"expected format <host>[:<port>[:<db>[:<password>]]]" %
src)
sys.exit()
def lookup(self, token):
try:
import redis
except ImportError:
logger.error("package redis not found, are you sure you've installed them correctly?")
sys.exit()
logger.info("resolving token '%s'" % token)
client = redis.Redis(host=self._server, port=self._port,
db=self._db, password=self._password)
stuff = client.get(token)
if stuff is None:
return None
else:
responseStr = stuff.decode("utf-8").strip()
logger.debug("response from redis : %s" % responseStr)
if responseStr.startswith("{"):
try:
combo = json.loads(responseStr)
host, port = combo["host"].split(":")
except ValueError:
logger.error("Unable to decode JSON token: %s" %
responseStr)
return None
except KeyError:
logger.error("Unable to find 'host' key in JSON token: %s" %
responseStr)
return None
elif re.match(r'\S+:\S+', responseStr):
host, port = responseStr.split(":")
else:
logger.error("Unable to parse token: %s" % responseStr)
return None
logger.debug("host: %s, port: %s" % (host, port))
return [host, port]
class UnixDomainSocketDirectory(BasePlugin):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._dir_path = os.path.abspath(self.source)
def lookup(self, token):
try:
import stat
if not os.path.isdir(self._dir_path):
return None
uds_path = os.path.abspath(os.path.join(self._dir_path, token))
if not uds_path.startswith(self._dir_path):
return None
if not os.path.exists(uds_path):
return None
if not stat.S_ISSOCK(os.stat(uds_path).st_mode):
return None
return [ 'unix_socket', uds_path ]
except Exception as e:
logger.error("Error finding unix domain socket: %s" % str(e))
return None
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