def __init__(self, areaMapper, nClusters, key,
ipCategories=None, answerParameters=None):
"""Create a Distributor that decides which bridges to distribute based
upon the client's IP address and the current time.
:type areaMapper: callable
:param areaMapper: A function that maps IP addresses arbitrarily to
strings, such that addresses which map to identical strings are
considered to be in the same "area" (for some arbitrary definition
of "area"). See :func:`bridgedb.Dist.uniformMap` for an example.
:param integer nClusters: The number of clusters to group IP addresses
into. Note that if PROXY_LIST_FILES is set in bridgedb.conf, then
the actual number of clusters is one higher than ``nClusters``,
because the set of known open proxies constitutes its own
category.
DOCDOC What exactly does a cluster *do*?
:param bytes key: The master HMAC key for this distributor. All added
bridges are HMACed with this key in order to place them into the
hashrings.
:type ipCategories: iterable or None
:param ipCategories: DOCDOC
:type answerParameters: :class:`bridgedb.Bridges.BridgeRingParameters`
:param answerParameters: A mechanism for ensuring that the set of
bridges that this distributor answers a client with fit certain
parameters, i.e. that an answer has "at least two obfsproxy
bridges" or "at least one bridge on port 443", etc.
"""
self.areaMapper = areaMapper
self.nClusters = nClusters
self.answerParameters = answerParameters
if not ipCategories:
ipCategories = []
if not answerParameters:
answerParameters = []
self.rings = []
self.categories = []
for c in ipCategories:
self.categories.append(c)
key2 = getHMAC(key, "Assign-Bridges-To-Rings")
key3 = getHMAC(key, "Order-Areas-In-Rings")
self.areaOrderHmac = getHMACFunc(key3, hex=False)
key4 = getHMAC(key, "Assign-Areas-To-Rings")
self.areaClusterHmac = getHMACFunc(key4, hex=True)
# add splitter and cache the default rings
# plus leave room for dynamic filters
#
# XXX Why is the "extra room" hardcoded to be 5? Shouldn't it be some
# fraction of the number of clusters/categories? --isis
ring_cache_size = self.nClusters + len(ipCategories) + 5
self.splitter = bridgedb.Bridges.FilteredBridgeSplitter(
key2, max_cached_rings=ring_cache_size)
logging.debug("Added splitter %s to IPBasedDistributor."
% self.splitter.__class__)
self.setDistributorName('HTTPS')
def __init__(self,
totalSubrings,
key,
proxies=None,
answerParameters=None):
"""Create a Distributor that decides which bridges to distribute based
upon the client's IP address and the current time.
:param int totalSubrings: The number of subhashrings to group clients
into. Note that if ``PROXY_LIST_FILES`` is set in bridgedb.conf,
then the actual number of clusters is one higher than
``totalSubrings``, because the set of all known open proxies is
given its own subhashring.
:param bytes key: The master HMAC key for this distributor. All added
bridges are HMACed with this key in order to place them into the
hashrings.
:type proxies: :class:`~bridgedb.proxy.ProxySet`
:param proxies: A :class:`bridgedb.proxy.ProxySet` containing known
Tor Exit relays and other known proxies. These will constitute
the extra cluster, and any client requesting bridges from one of
these **proxies** will be distributed bridges from a separate
subhashring that is specific to Tor/proxy users.
:type answerParameters:
:class:`bridgedb.bridgerings.BridgeRingParameters`
:param answerParameters: A mechanism for ensuring that the set of
bridges that this distributor answers a client with fit certain
parameters, i.e. that an answer has "at least two obfsproxy
bridges" or "at least one bridge on port 443", etc.
"""
super(HTTPSDistributor, self).__init__(key)
self.totalSubrings = totalSubrings
self.answerParameters = answerParameters
if proxies:
logging.info("Added known proxies to HTTPS distributor...")
self.proxies = proxies
self.totalSubrings += 1
self.proxySubring = self.totalSubrings
else:
logging.warn("No known proxies were added to HTTPS distributor!")
self.proxies = proxy.ProxySet()
self.proxySubring = 0
self.ringCacheSize = self.totalSubrings * 3
key2 = getHMAC(key, "Assign-Bridges-To-Rings")
key3 = getHMAC(key, "Order-Areas-In-Rings")
key4 = getHMAC(key, "Assign-Areas-To-Rings")
self._clientToPositionHMAC = getHMACFunc(key3, hex=False)
self._subnetToSubringHMAC = getHMACFunc(key4, hex=True)
self.hashring = FilteredBridgeSplitter(key2, self.ringCacheSize)
self.name = 'HTTPS'
logging.debug("Added %s to %s distributor." %
(self.hashring.__class__.__name__, self.name))
def __init__(self, totalSubrings, key, proxies=None, answerParameters=None):
"""Create a Distributor that decides which bridges to distribute based
upon the client's IP address and the current time.
:param int totalSubrings: The number of subhashrings to group clients
into. Note that if ``PROXY_LIST_FILES`` is set in bridgedb.conf,
then the actual number of clusters is one higher than
``totalSubrings``, because the set of all known open proxies is
given its own subhashring.
:param bytes key: The master HMAC key for this distributor. All added
bridges are HMACed with this key in order to place them into the
hashrings.
:type proxies: :class:`~bridgedb.proxy.ProxySet`
:param proxies: A :class:`bridgedb.proxy.ProxySet` containing known
Tor Exit relays and other known proxies. These will constitute
the extra cluster, and any client requesting bridges from one of
these **proxies** will be distributed bridges from a separate
subhashring that is specific to Tor/proxy users.
:type answerParameters: :class:`bridgedb.Bridges.BridgeRingParameters`
:param answerParameters: A mechanism for ensuring that the set of
bridges that this distributor answers a client with fit certain
parameters, i.e. that an answer has "at least two obfsproxy
bridges" or "at least one bridge on port 443", etc.
"""
super(HTTPSDistributor, self).__init__(key)
self.totalSubrings = totalSubrings
self.answerParameters = answerParameters
if proxies:
logging.info("Added known proxies to HTTPS distributor...")
self.proxies = proxies
self.totalSubrings += 1
self.proxySubring = self.totalSubrings
else:
logging.warn("No known proxies were added to HTTPS distributor!")
self.proxies = proxy.ProxySet()
self.proxySubring = 0
self.ringCacheSize = self.totalSubrings * 3
key2 = getHMAC(key, "Assign-Bridges-To-Rings")
key3 = getHMAC(key, "Order-Areas-In-Rings")
key4 = getHMAC(key, "Assign-Areas-To-Rings")
self._clientToPositionHMAC = getHMACFunc(key3, hex=False)
self._subnetToSubringHMAC = getHMACFunc(key4, hex=True)
self.hashring = FilteredBridgeSplitter(key2, self.ringCacheSize)
self.name = 'HTTPS'
logging.debug("Added %s to %s distributor." %
(self.hashring.__class__.__name__, self.name))
def __init__(self, key):
self.hmac = getHMACFunc(key, hex=True)
self.ringsByName = {}
self.totalP = 0
self.pValues = []
self.rings = []
self.statsHolders = []
def __init__(self, key, max_cached_rings=3):
"""Create a hashring which filters bridges into sub hashrings.
:type key: DOCDOC
:param key: An HMAC key.
:param int max_cached_rings: XXX max_cached_rings appears to not be
used anywhere.
:ivar filterRings: A dictionary of subrings which has the form
``{ringname: (filterFn, subring)}``, where:
- ``ringname`` is a unique string identifying the subring.
- ``filterFn`` is a callable which filters Bridges in some
manner, i.e. by whether they are IPv4 or IPv6, etc.
- ``subring`` is any of the horribly-implemented,
I-guess-it-passes-for-some-sort-of-hashring classes in this
module.
:ivar hmac: DOCDOC
:ivar bridges: DOCDOC
:type distributorName: str
:ivar distributorName: The name of this splitter's distributor. See
:meth:`~bridgedb.distributors.https.distributor.HTTPSDistributor.setDistributorName`.
"""
self.key = key
self.filterRings = {}
self.hmac = getHMACFunc(key, hex=True)
self.bridges = []
self.distributorName = ''
#XXX: unused
self.max_cached_rings = max_cached_rings
def __init__(self, key):
self.hmac = getHMACFunc(key, hex=True)
self.ringsByName = {}
self.totalP = 0
self.pValues = []
self.rings = []
self.statsHolders = []
def __init__(self, key, max_cached_rings=3):
"""Create a hashring which filters bridges into sub hashrings.
:type key: DOCDOC
:param key: An HMAC key.
:param int max_cached_rings: XXX max_cached_rings appears to not be
used anywhere.
:ivar filterRings: A dictionary of subrings which has the form
``{ringname: (filterFn, subring)}``, where:
- ``ringname`` is a unique string identifying the subring.
- ``filterFn`` is a callable which filters Bridges in some
manner, i.e. by whether they are IPv4 or IPv6, etc.
- ``subring`` is any of the horribly-implemented,
I-guess-it-passes-for-some-sort-of-hashring classes in this
module.
:ivar hmac: DOCDOC
:ivar bridges: DOCDOC
:type distributorName: str
:ivar distributorName: The name of this splitter's distributor. See
:meth:`~bridgedb.distributors.https.distributor.HTTPSDistributor.setDistributorName`.
"""
self.key = key
self.filterRings = {}
self.hmac = getHMACFunc(key, hex=True)
self.bridges = []
self.distributorName = ''
#XXX: unused
self.max_cached_rings = max_cached_rings
def __init__(self,
key,
domainmap,
domainrules,
answerParameters=None,
whitelist=None):
"""Create a bridge distributor which uses email.
:type emailHmac: callable
:param emailHmac: An hmac function used to order email addresses
within a ring. See :func:`~bridgedb.crypto.getHMACFunc`.
:param dict domainmap: A map from lowercase domains that we support
mail from to their canonical forms. See `EMAIL_DOMAIN_MAP` option
in `bridgedb.conf`.
:param domainrules: DOCDOC
:param answerParameters: DOCDOC
:type whitelist: dict or ``None``
:param whitelist: A dictionary that maps whitelisted email addresses
to GnuPG fingerprints.
"""
super(EmailDistributor, self).__init__(key)
self.domainmap = domainmap
self.domainrules = domainrules
self.whitelist = whitelist or dict()
self.answerParameters = answerParameters
key1 = getHMAC(key, "Map-Addresses-To-Ring")
key2 = getHMAC(key, "Order-Bridges-In-Ring")
self.emailHmac = getHMACFunc(key1, hex=False)
#XXX cache options not implemented
self.hashring = FilteredBridgeSplitter(key2, max_cached_rings=5)
self.name = "Email"
def __init__(self, key, domainmap, domainrules,
answerParameters=None, whitelist=None):
"""Create a bridge distributor which uses email.
:type emailHmac: callable
:param emailHmac: An hmac function used to order email addresses
within a ring. See :func:`~bridgedb.crypto.getHMACFunc`.
:param dict domainmap: A map from lowercase domains that we support
mail from to their canonical forms. See `EMAIL_DOMAIN_MAP` option
in `bridgedb.conf`.
:param domainrules: DOCDOC
:param answerParameters: DOCDOC
:type whitelist: dict or ``None``
:param whitelist: A dictionary that maps whitelisted email addresses
to GnuPG fingerprints.
"""
super(EmailDistributor, self).__init__(key)
self.domainmap = domainmap
self.domainrules = domainrules
self.whitelist = whitelist or dict()
self.answerParameters = answerParameters
key1 = getHMAC(key, "Map-Addresses-To-Ring")
key2 = getHMAC(key, "Order-Bridges-In-Ring")
self.emailHmac = getHMACFunc(key1, hex=False)
#XXX cache options not implemented
self.hashring = FilteredBridgeSplitter(key2, max_cached_rings=5)
self.name = "Email"
def __init__(self, key, domainmap, domainrules,
answerParameters=None):
"""Create a bridge distributor which uses email.
:type emailHmac: callable
:param emailHmac: An hmac function used to order email addresses
within a ring. See :func:`~bridgedb.crypto.getHMACFunc`.
:param dict domainmap: A map from lowercase domains that we support
mail from to their canonical forms. See `EMAIL_DOMAIN_MAP` option
in `bridgedb.conf`.
:param domainrules: DOCDOC
:param answerParameters: DOCDOC
"""
key1 = getHMAC(key, "Map-Addresses-To-Ring")
self.emailHmac = getHMACFunc(key1, hex=False)
key2 = getHMAC(key, "Order-Bridges-In-Ring")
# XXXX clear the store when the period rolls over!
self.domainmap = domainmap
self.domainrules = domainrules
self.answerParameters = answerParameters
#XXX cache options not implemented
self.splitter = bridgedb.Bridges.FilteredBridgeSplitter(
key2, max_cached_rings=5)
self.setDistributorName('Email')
def setUp(self):
"""Create a Bridge whose address is 1.1.1.1, orPort is 1111, and
fingerprint is 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'. Also,
create an HMAC function whose key is 'plasma'.
"""
self.bridge = Bridge()
self.bridge.address = '1.1.1.1'
self.bridge.orPort = 1111
self.bridge.fingerprint = 'a' * 40
self.hmac = getHMACFunc('plasma')
def setUp(self):
"""Create a Bridge whose address is 1.1.1.1, orPort is 1111, and
fingerprint is 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'. Also,
create an HMAC function whose key is 'plasma'.
"""
self.bridge = Bridge()
self.bridge.address = '1.1.1.1'
self.bridge.orPort = 1111
self.bridge.fingerprint = 'a' * 40
self.hmac = getHMACFunc('plasma')
def setUp(self):
"""Create a Bridge whose address is 1.1.1.1, orPort is 1111, and
fingerprint is 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'. Also,
create an HMAC function whose key is 'plasma'.
"""
self.bridge = Bridge()
self.bridge.address = '1.1.1.1'
self.bridge.orPort = 1111
self.bridge.fingerprint = 'a' * 40
self.hmac = getHMACFunc('plasma')
PluggableTransport.probing_resistant_transports = [
'scramblesuit', 'obfs4'
]
def getHashringPlacement(self, key, client=None):
"""Create an HMAC of some **client** info using a **key**.
:param str key: The key to use for HMACing.
:param str client: Some (hopefully unique) information about the
client who is requesting bridges, such as an IP or email address.
:rtype: long
:returns: A long specifying index of the first node in a hashring to
be distributed to the client. This value should obviously be used
mod the number of nodes in the hashring.
"""
if not client:
client = self.client
# Get an HMAC with the key of the client identifier:
digest = getHMACFunc(key)(client)
# Take the lower 8 bytes of the digest and convert to a long:
position = long(digest[:8], 16)
return position
def getHashringPlacement(self, key, client=None):
"""Create an HMAC of some **client** info using a **key**.
:param str key: The key to use for HMACing.
:param str client: Some (hopefully unique) information about the
client who is requesting bridges, such as an IP or email address.
:rtype: long
:returns: A long specifying index of the first node in a hashring to
be distributed to the client. This value should obviously be used
mod the number of nodes in the hashring.
"""
if not client:
client = type('')(self.client)
# Get an HMAC with the key of the client identifier:
digest = getHMACFunc(key)(client)
# Take the lower 8 bytes of the digest and convert to a long:
position = int(digest[:8], 16)
return position
def __init__(self, key, rings):
self.hmac = getHMACFunc(key, hex=True)
self.rings = rings[:]
def __init__(self, key, rings):
self.hmac = getHMACFunc(key, hex=True)
self.rings = rings[:]
for r in self.rings:
assert (isinstance(r, BridgeHolder))
def __init__(self, key, rings):
self.hmac = getHMACFunc(key, hex=True)
self.rings = rings[:]
for r in self.rings:
assert(isinstance(r, BridgeHolder))
def __init__(self, key, answerParameters=None):
"""Create a new BridgeRing, using key as its hmac key.
:type key: bytes
:param key: The HMAC key, generated with
:func:`~bridgedb.crypto.getKey`.
:type answerParameters: :class:`BridgeRingParameters`
:param answerParameters: DOCDOC
:ivar dict bridges: A dictionary which maps HMAC keys to
:class:`~bridgedb.bridges.Bridge`s.
:ivar dict bridgesByID: A dictionary which maps raw hash digests of
bridge ID keys to :class:`~bridgedb.bridges.Bridge`s.
:type hmac: callable
:ivar hmac: An HMAC function, which uses the **key** parameter to
generate new HMACs for storing, inserting, and retrieving
:class:`~bridgedb.bridges.Bridge`s within mappings.
:ivar bool isSorted: ``True`` if ``sortedKeys`` is currently sorted.
:ivar list sortedKeys: A sorted list of all of the HMACs.
:ivar str name: A string which identifies this hashring, used mostly
for differentiating this hashring in log messages, but it is also
used for naming subrings. If this hashring is a subring, the
``name`` will include whatever distinguishing parameters
differentiate that particular subring (i.e. ``'(port-443
subring)'`` or ``'(Stable subring)'``)
:type subrings: list
:ivar subrings: A list of other ``BridgeRing``s, each of which
contains bridges of a particular type. For example, a subring
might contain only ``Bridge``s which have been given the "Stable"
flag, or it might contain only IPv6 bridges. Each item in this
list should be a 4-tuple::
(type, value, count, ring)
where:
- ``type`` is a string which describes what kind of parameter is
used to determine if a ``Bridge`` belongs in that subring,
i.e. ``'port'`` or ``'flag'``.
- ``value`` is a specific value pertaining to the ``type``,
e.g. ``type='port'; value=443``.
- ``count`` is an integer for the current total number of
bridges in the subring.
- ``ring`` is a :class:`BridgeRing`; it is the subhashring which
contains ``count`` number of
:class:`~bridgedb.bridges.Bridge`s of a certain ``type``.
"""
self.bridges = {}
self.bridgesByID = {}
self.hmac = getHMACFunc(key, hex=False)
self.isSorted = False
self.sortedKeys = []
if answerParameters is None:
answerParameters = BridgeRingParameters()
self.answerParameters = answerParameters
self.subrings = []
for port, count in self.answerParameters.needPorts:
#note that we really need to use the same key here, so that
# the mapping is in the same order for all subrings.
self.subrings.append(('port', port, count, BridgeRing(key, None)))
for flag, count in self.answerParameters.needFlags:
self.subrings.append(('flag', flag, count, BridgeRing(key, None)))
self.setName("Ring")
def __init__(self, key, rings):
self.hmac = getHMACFunc(key, hex=True)
self.rings = rings[:]
def __init__(self, key, answerParameters=None):
"""Create a new BridgeRing, using key as its hmac key.
:type key: bytes
:param key: The HMAC key, generated with
:func:`~bridgedb.crypto.getKey`.
:type answerParameters: :class:`BridgeRingParameters`
:param answerParameters: DOCDOC
:ivar dict bridges: A dictionary which maps HMAC keys to
:class:`~bridgedb.bridges.Bridge`s.
:ivar dict bridgesByID: A dictionary which maps raw hash digests of
bridge ID keys to :class:`~bridgedb.bridges.Bridge`s.
:type hmac: callable
:ivar hmac: An HMAC function, which uses the **key** parameter to
generate new HMACs for storing, inserting, and retrieving
:class:`~bridgedb.bridges.Bridge`s within mappings.
:ivar bool isSorted: ``True`` if ``sortedKeys`` is currently sorted.
:ivar list sortedKeys: A sorted list of all of the HMACs.
:ivar str name: A string which identifies this hashring, used mostly
for differentiating this hashring in log messages, but it is also
used for naming subrings. If this hashring is a subring, the
``name`` will include whatever distinguishing parameters
differentiate that particular subring (i.e. ``'(port-443
subring)'`` or ``'(Stable subring)'``)
:type subrings: list
:ivar subrings: A list of other ``BridgeRing``s, each of which
contains bridges of a particular type. For example, a subring
might contain only ``Bridge``s which have been given the "Stable"
flag, or it might contain only IPv6 bridges. Each item in this
list should be a 4-tuple::
(type, value, count, ring)
where:
- ``type`` is a string which describes what kind of parameter is
used to determine if a ``Bridge`` belongs in that subring,
i.e. ``'port'`` or ``'flag'``.
- ``value`` is a specific value pertaining to the ``type``,
e.g. ``type='port'; value=443``.
- ``count`` is an integer for the current total number of
bridges in the subring.
- ``ring`` is a :class:`BridgeRing`; it is the subhashring which
contains ``count`` number of
:class:`~bridgedb.bridges.Bridge`s of a certain ``type``.
"""
self.bridges = {}
self.bridgesByID = {}
self.hmac = getHMACFunc(key, hex=False)
self.isSorted = False
self.sortedKeys = []
if answerParameters is None:
answerParameters = BridgeRingParameters()
self.answerParameters = answerParameters
self.subrings = []
for port,count in self.answerParameters.needPorts:
#note that we really need to use the same key here, so that
# the mapping is in the same order for all subrings.
self.subrings.append( ('port',port,count,BridgeRing(key,None)) )
for flag,count in self.answerParameters.needFlags:
self.subrings.append( ('flag',flag,count,BridgeRing(key,None)) )
self.setName("Ring")
