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@@ -21,6 +21,7 @@ import binascii |
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import logging
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import hashlib
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from hashlib import pbkdf2_hmac
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+from typing import Optional
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from nbxmpp.namespaces import Namespace
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from nbxmpp.protocol import Node
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@@ -32,7 +33,7 @@ from nbxmpp.util import LogAdapter |
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from nbxmpp.const import StreamState
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-log = logging.getLogger('nbxmpp.auth')
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+log = logging.getLogger('nbxmpp.sasl')
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try:
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gssapi = __import__('gssapi')
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@@ -51,9 +52,20 @@ class SASL: |
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self._password = None
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+ self._mechanism_classes = {
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+ 'PLAIN': PLAIN,
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+ 'EXTERNAL': EXTERNAL,
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+ 'GSSAPI': GSSAPI,
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+ 'SCRAM-SHA-1': SCRAM_SHA_1,
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+ 'SCRAM-SHA-1-PLUS': SCRAM_SHA_1_PLUS,
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+ 'SCRAM-SHA-256': SCRAM_SHA_256,
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+ 'SCRAM-SHA-256-PLUS': SCRAM_SHA_256_PLUS,
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+ 'SCRAM-SHA-512': SCRAM_SHA_512,
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+ 'SCRAM-SHA-512-PLUS': SCRAM_SHA_512_PLUS
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+ }
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+
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self._allowed_mechs = None
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self._enabled_mechs = None
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- self._method = None
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self._error = None
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self._log = LogAdapter(log, {'context': client.log_context})
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@@ -82,13 +94,14 @@ class SASL: |
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def start_auth(self, features):
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self._allowed_mechs = self._client.mechs
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self._enabled_mechs = self._allowed_mechs
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- self._method = None
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+ self._mechanism = None
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self._error = None
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# -PLUS variants need TLS channel binding data
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# This is currently not supported via GLib
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self._enabled_mechs.discard('SCRAM-SHA-1-PLUS')
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self._enabled_mechs.discard('SCRAM-SHA-256-PLUS')
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+ self._enabled_mechs.discard('SCRAM-SHA-512-PLUS')
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# channel_binding_data = None
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if not GSSAPI_AVAILABLE:
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@@ -127,69 +140,49 @@ class SASL: |
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self._on_sasl_finished(False, 'no-password')
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return
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- # if chosen_mechanism == 'SCRAM-SHA-256-PLUS':
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- # self._method = SCRAM_SHA_256_PLUS(self._client,
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- # channel_binding_data)
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- # self._method.initiate(self._client.username, self._password)
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-
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- # elif chosen_mechanism == 'SCRAM-SHA-1-PLUS':
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- # self._method = SCRAM_SHA_1_PLUS(self._client,
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- # channel_binding_data)
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- # self._method.initiate(self._client.username, self._password)
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-
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- if chosen_mechanism == 'SCRAM-SHA-512':
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- self._method = SCRAM_SHA_512(self._client, None)
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- self._method.initiate(self._client.username, self._password)
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-
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- elif chosen_mechanism == 'SCRAM-SHA-256':
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- self._method = SCRAM_SHA_256(self._client, None)
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- self._method.initiate(self._client.username, self._password)
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-
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- elif chosen_mechanism == 'SCRAM-SHA-1':
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- self._method = SCRAM_SHA_1(self._client, None)
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- self._method.initiate(self._client.username, self._password)
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+ mech_class = self._mechanism_classes[chosen_mechanism]
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+ self._mechanism = mech_class(self._client.username,
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+ self._password,
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+ domain_based_name or self._client.domain)
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- elif chosen_mechanism == 'PLAIN':
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- self._method = PLAIN(self._client)
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- self._method.initiate(self._client.username, self._password)
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-
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- elif chosen_mechanism == 'ANONYMOUS':
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- self._method = ANONYMOUS(self._client)
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- self._method.initiate() # pylint: disable=E1120
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-
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- elif chosen_mechanism == 'EXTERNAL':
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- self._method = EXTERNAL(self._client)
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- self._method.initiate(self._client.username, self._client.Server)
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+ try:
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+ self._send_initiate()
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+ except AuthFail as error:
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+ self._log.error(error)
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+ self._abort_auth()
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+ return
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- elif chosen_mechanism == 'GSSAPI':
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- self._method = GSSAPI(self._client)
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- if domain_based_name:
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- hostname = domain_based_name
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- else:
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- hostname = self._client.domain
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- try:
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- self._method.initiate(hostname) # pylint: disable=E1120
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- except AuthFail as error:
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- self._log.error(error)
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- self._abort_auth()
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- return
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- else:
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- self._log.error('Unknown auth mech')
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+ def _send_initiate(self) -> None:
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+ data = self._mechanism.get_initiate_data()
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+ node = Node('auth',
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+ attrs={'xmlns': Namespace.SASL,
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+ 'mechanism': self._mechanism.name})
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+ if data is not None:
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+ node.setData(data)
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+ self._client.send_nonza(node)
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163
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179
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- def _on_challenge(self, stanza):
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+ def _on_challenge(self, stanza) -> None:
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try:
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- self._method.response(stanza.getData())
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+ data = self._mechanism.get_response_data(stanza.getData())
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except AttributeError:
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self._log.info('Mechanism has no response method')
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self._abort_auth()
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+ return
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+
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except AuthFail as error:
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self._log.error(error)
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self._abort_auth()
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+ return
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+
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+ node = Node('response',
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+ attrs={'xmlns': Namespace.SASL},
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+ payload=[data])
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+ self._client.send_nonza(node)
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def _on_success(self, stanza):
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self._log.info('Successfully authenticated with remote server')
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try:
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- self._method.success(stanza.getData())
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+ self._mechanism.get_success_data(stanza.getData())
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except AttributeError:
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pass
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except AuthFail as error:
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| ... |
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@@ -227,61 +220,59 @@ class SASL: |
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227
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220
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self._client.set_state(StreamState.AUTH_SUCCESSFUL)
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221
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229
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222
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-class PLAIN:
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+class BaseMechanism:
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231
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224
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232
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- _mechanism = 'PLAIN'
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+ name: str
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233
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226
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234
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- def __init__(self, client):
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- self._client = client
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227
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+ def __init__(self, username: str, password: str, domain: str):
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+ self._username = username
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+ self._password = password
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+ self._domain = domain
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231
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237
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- def initiate(self, username, password):
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- payload = b64encode('\x00%s\x00%s' % (username, password))
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- node = Node('auth',
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240
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- attrs={'xmlns': Namespace.SASL, 'mechanism': 'PLAIN'},
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- payload=[payload])
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242
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- self._client.send_nonza(node)
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232
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+ def get_initiate_data(self) -> Optional[str]:
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233
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+ raise NotImplementedError
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243
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234
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235
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+ def get_response_data(self, data: str) -> str:
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236
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+ raise NotImplementedError
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244
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237
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245
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-class EXTERNAL:
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238
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+ def validate_success_data(self, data: str) -> None:
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239
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+ raise NotImplementedError
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246
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240
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247
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- _mechanism = 'EXTERNAL'
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248
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241
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249
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- def __init__(self, client):
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250
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- self._client = client
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242
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+class PLAIN(BaseMechanism):
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251
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243
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252
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- def initiate(self, username, server):
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253
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- payload = b64encode('%s@%s' % (username, server))
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254
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- node = Node('auth',
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255
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- attrs={'xmlns': Namespace.SASL, 'mechanism': 'EXTERNAL'},
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256
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- payload=[payload])
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257
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- self._client.send_nonza(node)
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244
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+ name = 'PLAIN'
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258
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245
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246
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+ def get_initiate_data(self) -> str:
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247
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+ return b64encode('\x00%s\x00%s' % (self._username, self._password))
|
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259
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248
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260
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-class ANONYMOUS:
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261
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249
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262
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- _mechanism = 'ANONYMOUS'
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250
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+class EXTERNAL(BaseMechanism):
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263
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251
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264
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- def __init__(self, client):
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265
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- self._client = client
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252
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+ name = 'EXTERNAL'
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266
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253
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267
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- def initiate(self):
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268
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- node = Node('auth', attrs={'xmlns': Namespace.SASL,
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269
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- 'mechanism': 'ANONYMOUS'})
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270
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- self._client.send_nonza(node)
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254
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+ def get_initiate_data(self) -> str:
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255
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+ return b64encode('%s@%s' % (self._username, self._domain))
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271
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256
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272
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257
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273
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-class GSSAPI:
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258
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+class ANONYMOUS(BaseMechanism):
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274
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259
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275
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- # See https://tools.ietf.org/html/rfc4752#section-3.1
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260
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+ name = 'ANONYMOUS'
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276
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261
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277
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- _mechanism = 'GSSAPI'
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262
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+ def get_initiate_data(self) -> None:
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263
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+ return None
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278
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264
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279
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- def __init__(self, client):
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280
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- self._client = client
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281
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265
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282
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- def initiate(self, hostname):
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266
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+class GSSAPI(BaseMechanism):
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267
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+
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268
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+ # See https://tools.ietf.org/html/rfc4752#section-3.1
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269
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+
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270
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+ name = 'GSSAPI'
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271
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+
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272
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+ def get_initiate_data(self) -> str:
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283
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273
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service = gssapi.Name(
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284
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- 'xmpp@%s' % hostname, name_type=gssapi.NameType.hostbased_service)
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274
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+ 'xmpp@%s' % self._domain,
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275
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+ name_type=gssapi.NameType.hostbased_service)
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285
|
276
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try:
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286
|
277
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self.ctx = gssapi.SecurityContext(
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|
287
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278
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name=service, usage="initiate",
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| ... |
... |
@@ -289,75 +280,66 @@ class GSSAPI: |
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289
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280
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token = self.ctx.step()
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290
|
281
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except (gssapi.exceptions.GeneralError, gssapi.raw.misc.GSSError) as e:
|
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291
|
282
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raise AuthFail(e)
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292
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|
- node = Node('auth',
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293
|
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- attrs={'xmlns': Namespace.SASL, 'mechanism': 'GSSAPI'},
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294
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- payload=b64encode(token))
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295
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- self._client.send_nonza(node)
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296
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283
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297
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- def response(self, server_message, *args, **kwargs):
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298
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- server_message = b64decode(server_message)
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|
284
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+ return b64encode(token)
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|
285
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+
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|
286
|
+ def get_response_data(self, data: str) -> str:
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|
287
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+ byte_data = b64decode(data)
|
|
299
|
288
|
try:
|
|
300
|
289
|
if not self.ctx.complete:
|
|
301
|
|
- output_token = self.ctx.step(server_message)
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|
290
|
+ output_token = self.ctx.step(byte_data)
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|
302
|
291
|
else:
|
|
303
|
|
- _result = self.ctx.unwrap(server_message)
|
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|
292
|
+ _result = self.ctx.unwrap(byte_data)
|
|
304
|
293
|
# TODO(jelmer): Log result.message
|
|
305
|
294
|
data = b'\x00\x00\x00\x00' + bytes(self.ctx.initiator_name)
|
|
306
|
295
|
output_token = self.ctx.wrap(data, False).message
|
|
307
|
296
|
except (gssapi.exceptions.GeneralError, gssapi.raw.misc.GSSError) as e:
|
|
308
|
297
|
raise AuthFail(e)
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|
309
|
|
- response = b64encode(output_token)
|
|
310
|
|
- node = Node('response',
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311
|
|
- attrs={'xmlns': Namespace.SASL},
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312
|
|
- payload=response)
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|
313
|
|
- self._client.send_nonza(node)
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|
298
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+
|
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|
299
|
+ return b64encode(output_token)
|
|
314
|
300
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|
|
315
|
301
|
|
|
316
|
|
-class SCRAM:
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|
|
302
|
+class SCRAM(BaseMechanism):
|
|
317
|
303
|
|
|
318
|
|
- _mechanism = ''
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|
304
|
+ name = ''
|
|
319
|
305
|
_channel_binding = ''
|
|
320
|
306
|
_hash_method = ''
|
|
321
|
307
|
|
|
322
|
|
- def __init__(self, client, channel_binding):
|
|
323
|
|
- self._client = client
|
|
324
|
|
- self._channel_binding_data = channel_binding
|
|
|
308
|
+ def __init__(self, *args, **kwargs) -> None:
|
|
|
309
|
+ BaseMechanism.__init__(self, *args, **kwargs)
|
|
|
310
|
+ self._channel_binding_data = None
|
|
325
|
311
|
self._client_nonce = '%x' % int(binascii.hexlify(os.urandom(24)), 16)
|
|
326
|
312
|
self._client_first_message_bare = None
|
|
327
|
313
|
self._server_signature = None
|
|
328
|
|
- self._password = None
|
|
|
314
|
+
|
|
|
315
|
+ def set_channel_binding_data(self, data: bytes) -> None:
|
|
|
316
|
+ self._channel_binding_data = data
|
|
329
|
317
|
|
|
330
|
318
|
@property
|
|
331
|
|
- def nonce_length(self):
|
|
|
319
|
+ def nonce_length(self) -> int:
|
|
332
|
320
|
return len(self._client_nonce)
|
|
333
|
321
|
|
|
334
|
322
|
@property
|
|
335
|
|
- def _b64_channel_binding_data(self):
|
|
336
|
|
- if self._mechanism.endswith('PLUS'):
|
|
|
323
|
+ def _b64_channel_binding_data(self) -> str:
|
|
|
324
|
+ if self.name.endswith('PLUS'):
|
|
337
|
325
|
return b64encode(b'%s%s' % (self._channel_binding.encode(),
|
|
338
|
326
|
self._channel_binding_data))
|
|
339
|
327
|
return b64encode(self._channel_binding)
|
|
340
|
328
|
|
|
341
|
329
|
@staticmethod
|
|
342
|
|
- def _scram_parse(scram_data):
|
|
|
330
|
+ def _scram_parse(scram_data: str) -> dict[str, str]:
|
|
343
|
331
|
return dict(s.split('=', 1) for s in scram_data.split(','))
|
|
344
|
332
|
|
|
345
|
|
- def initiate(self, username, password):
|
|
346
|
|
- self._password = password
|
|
347
|
|
- self._client_first_message_bare = 'n=%s,r=%s' % (username,
|
|
|
333
|
+ def get_initiate_data(self) -> str:
|
|
|
334
|
+ self._client_first_message_bare = 'n=%s,r=%s' % (self._username,
|
|
348
|
335
|
self._client_nonce)
|
|
349
|
336
|
client_first_message = '%s%s' % (self._channel_binding,
|
|
350
|
337
|
self._client_first_message_bare)
|
|
351
|
338
|
|
|
352
|
|
- payload = b64encode(client_first_message)
|
|
353
|
|
- node = Node('auth',
|
|
354
|
|
- attrs={'xmlns': Namespace.SASL,
|
|
355
|
|
- 'mechanism': self._mechanism},
|
|
356
|
|
- payload=[payload])
|
|
357
|
|
- self._client.send_nonza(node)
|
|
|
339
|
+ return b64encode(client_first_message)
|
|
358
|
340
|
|
|
359
|
|
- def response(self, server_first_message):
|
|
360
|
|
- server_first_message = b64decode(server_first_message).decode()
|
|
|
341
|
+ def get_response_data(self, data) -> str:
|
|
|
342
|
+ server_first_message = b64decode(data).decode()
|
|
361
|
343
|
challenge = self._scram_parse(server_first_message)
|
|
362
|
344
|
|
|
363
|
345
|
client_nonce = challenge['r'][:self.nonce_length]
|
| ... |
... |
@@ -397,64 +379,66 @@ class SCRAM: |
|
397
|
379
|
server_key = self._hmac(salted_password, 'Server Key')
|
|
398
|
380
|
self._server_signature = self._hmac(server_key, auth_message)
|
|
399
|
381
|
|
|
400
|
|
- payload = b64encode(client_finale_message)
|
|
401
|
|
- node = Node('response',
|
|
402
|
|
- attrs={'xmlns': Namespace.SASL},
|
|
403
|
|
- payload=[payload])
|
|
404
|
|
- self._client.send_nonza(node)
|
|
|
382
|
+ return b64encode(client_finale_message)
|
|
405
|
383
|
|
|
406
|
|
- def success(self, server_last_message):
|
|
407
|
|
- server_last_message = b64decode(server_last_message).decode()
|
|
|
384
|
+ def validate_success_data(self, data: str) -> None:
|
|
|
385
|
+ server_last_message = b64decode(data).decode()
|
|
408
|
386
|
success = self._scram_parse(server_last_message)
|
|
409
|
387
|
server_signature = b64decode(success['v'])
|
|
410
|
388
|
if server_signature != self._server_signature:
|
|
411
|
389
|
raise AuthFail('Invalid server signature')
|
|
412
|
390
|
|
|
413
|
|
- def _hmac(self, key, message):
|
|
|
391
|
+ def _hmac(self, key: bytes, message: str) -> bytes:
|
|
414
|
392
|
return hmac.new(key=key,
|
|
415
|
393
|
msg=message.encode(),
|
|
416
|
394
|
digestmod=self._hash_method).digest()
|
|
417
|
395
|
|
|
418
|
396
|
@staticmethod
|
|
419
|
|
- def _xor(x, y):
|
|
|
397
|
+ def _xor(x: bytes, y: bytes) -> bytes:
|
|
420
|
398
|
return bytes([px ^ py for px, py in zip(x, y)])
|
|
421
|
399
|
|
|
422
|
|
- def _h(self, data):
|
|
|
400
|
+ def _h(self, data: bytes) -> bytes:
|
|
423
|
401
|
return hashlib.new(self._hash_method, data).digest()
|
|
424
|
402
|
|
|
425
|
403
|
|
|
426
|
404
|
class SCRAM_SHA_1(SCRAM):
|
|
427
|
405
|
|
|
428
|
|
- _mechanism = 'SCRAM-SHA-1'
|
|
|
406
|
+ name = 'SCRAM-SHA-1'
|
|
429
|
407
|
_channel_binding = 'n,,'
|
|
430
|
408
|
_hash_method = 'sha1'
|
|
431
|
409
|
|
|
432
|
410
|
|
|
433
|
411
|
class SCRAM_SHA_1_PLUS(SCRAM_SHA_1):
|
|
434
|
412
|
|
|
435
|
|
- _mechanism = 'SCRAM-SHA-1-PLUS'
|
|
|
413
|
+ name = 'SCRAM-SHA-1-PLUS'
|
|
436
|
414
|
_channel_binding = 'p=tls-unique,,'
|
|
437
|
415
|
|
|
438
|
416
|
|
|
439
|
417
|
class SCRAM_SHA_256(SCRAM):
|
|
440
|
418
|
|
|
441
|
|
- _mechanism = 'SCRAM-SHA-256'
|
|
|
419
|
+ name = 'SCRAM-SHA-256'
|
|
442
|
420
|
_channel_binding = 'n,,'
|
|
443
|
421
|
_hash_method = 'sha256'
|
|
444
|
422
|
|
|
445
|
423
|
|
|
446
|
424
|
class SCRAM_SHA_256_PLUS(SCRAM_SHA_256):
|
|
447
|
425
|
|
|
448
|
|
- _mechanism = 'SCRAM-SHA-256-PLUS'
|
|
|
426
|
+ name = 'SCRAM-SHA-256-PLUS'
|
|
449
|
427
|
_channel_binding = 'p=tls-unique,,'
|
|
450
|
428
|
|
|
451
|
429
|
|
|
452
|
430
|
class SCRAM_SHA_512(SCRAM):
|
|
453
|
431
|
|
|
454
|
|
- _mechanism = 'SCRAM-SHA-512'
|
|
|
432
|
+ name = 'SCRAM-SHA-512'
|
|
455
|
433
|
_channel_binding = 'n,,'
|
|
456
|
434
|
_hash_method = 'sha512'
|
|
457
|
435
|
|
|
458
|
436
|
|
|
|
437
|
+class SCRAM_SHA_512_PLUS(SCRAM_SHA_512):
|
|
|
438
|
+
|
|
|
439
|
+ name = 'SCRAM-SHA-512-PLUS'
|
|
|
440
|
+ _channel_binding = 'p=tls-unique,,'
|
|
|
441
|
+
|
|
|
442
|
+
|
|
459
|
443
|
class AuthFail(Exception):
|
|
460
|
444
|
pass |