806 lines
30 KiB
Python
806 lines
30 KiB
Python
# Copyright 2015, 2016 OpenMarket Ltd
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# Copyright 2017 Vector Creations Ltd
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utilities for interacting with Identity Servers"""
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import logging
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import urllib.parse
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from typing import TYPE_CHECKING, Awaitable, Callable, Dict, List, Optional, Tuple
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import attr
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from synapse.api.errors import (
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CodeMessageException,
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Codes,
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HttpResponseException,
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SynapseError,
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)
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.http import RequestTimedOutError
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from synapse.http.client import SimpleHttpClient
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from synapse.http.site import SynapseRequest
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from synapse.types import JsonDict, Requester
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from synapse.util import json_decoder
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from synapse.util.hash import sha256_and_url_safe_base64
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from synapse.util.stringutils import (
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assert_valid_client_secret,
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random_string,
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valid_id_server_location,
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)
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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id_server_scheme = "https://"
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class IdentityHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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# An HTTP client for contacting trusted URLs.
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self.http_client = SimpleHttpClient(hs)
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# An HTTP client for contacting identity servers specified by clients.
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self._http_client = SimpleHttpClient(
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hs,
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ip_blocklist=hs.config.server.federation_ip_range_blocklist,
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ip_allowlist=hs.config.server.federation_ip_range_allowlist,
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)
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self.federation_http_client = hs.get_federation_http_client()
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self.hs = hs
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self._web_client_location = hs.config.email.invite_client_location
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# Ratelimiters for `/requestToken` endpoints.
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self._3pid_validation_ratelimiter_ip = Ratelimiter(
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store=self.store,
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clock=hs.get_clock(),
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cfg=hs.config.ratelimiting.rc_3pid_validation,
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)
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self._3pid_validation_ratelimiter_address = Ratelimiter(
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store=self.store,
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clock=hs.get_clock(),
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cfg=hs.config.ratelimiting.rc_3pid_validation,
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)
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async def ratelimit_request_token_requests(
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self,
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request: SynapseRequest,
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medium: str,
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address: str,
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) -> None:
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"""Used to ratelimit requests to `/requestToken` by IP and address.
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Args:
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request: The associated request
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medium: The type of threepid, e.g. "msisdn" or "email"
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address: The actual threepid ID, e.g. the phone number or email address
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"""
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await self._3pid_validation_ratelimiter_ip.ratelimit(
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None, (medium, request.getClientAddress().host)
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)
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await self._3pid_validation_ratelimiter_address.ratelimit(
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None, (medium, address)
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)
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async def threepid_from_creds(
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self, id_server: str, creds: Dict[str, str]
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) -> Optional[JsonDict]:
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"""
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Retrieve and validate a threepid identifier from a "credentials" dictionary against a
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given identity server
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Args:
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id_server: The identity server to validate 3PIDs against. Must be a
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complete URL including the protocol (http(s)://)
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creds: Dictionary containing the following keys:
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* client_secret|clientSecret: A unique secret str provided by the client
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* sid: The ID of the validation session
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Returns:
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A dictionary consisting of response params to the /getValidated3pid
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endpoint of the Identity Service API, or None if the threepid was not found
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"""
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client_secret = creds.get("client_secret") or creds.get("clientSecret")
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if not client_secret:
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raise SynapseError(
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400, "Missing param client_secret in creds", errcode=Codes.MISSING_PARAM
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)
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assert_valid_client_secret(client_secret)
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session_id = creds.get("sid")
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if not session_id:
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raise SynapseError(
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400, "Missing param session_id in creds", errcode=Codes.MISSING_PARAM
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)
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query_params = {"sid": session_id, "client_secret": client_secret}
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url = id_server + "/_matrix/identity/api/v1/3pid/getValidated3pid"
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try:
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data = await self.http_client.get_json(url, query_params)
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except RequestTimedOutError:
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raise SynapseError(500, "Timed out contacting identity server")
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except HttpResponseException as e:
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logger.info(
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"%s returned %i for threepid validation for: %s",
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id_server,
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e.code,
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creds,
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)
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return None
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# Old versions of Sydent return a 200 http code even on a failed validation
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# check. Thus, in addition to the HttpResponseException check above (which
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# checks for non-200 errors), we need to make sure validation_session isn't
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# actually an error, identified by the absence of a "medium" key
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# See https://github.com/matrix-org/sydent/issues/215 for details
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if "medium" in data:
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return data
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logger.info("%s reported non-validated threepid: %s", id_server, creds)
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return None
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async def bind_threepid(
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self,
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client_secret: str,
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sid: str,
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mxid: str,
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id_server: str,
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id_access_token: str,
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) -> JsonDict:
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"""Bind a 3PID to an identity server
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Args:
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client_secret: A unique secret provided by the client
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sid: The ID of the validation session
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mxid: The MXID to bind the 3PID to
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id_server: The domain of the identity server to query
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id_access_token: The access token to authenticate to the identity
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server with
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Raises:
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SynapseError: On any of the following conditions
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- the supplied id_server is not a valid identity server name
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- we failed to contact the supplied identity server
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Returns:
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The response from the identity server
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"""
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logger.debug("Proxying threepid bind request for %s to %s", mxid, id_server)
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if not valid_id_server_location(id_server):
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raise SynapseError(
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400,
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"id_server must be a valid hostname with optional port and path components",
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)
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bind_data = {"sid": sid, "client_secret": client_secret, "mxid": mxid}
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bind_url = "https://%s/_matrix/identity/v2/3pid/bind" % (id_server,)
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headers = {"Authorization": create_id_access_token_header(id_access_token)}
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try:
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# Use the blacklisting http client as this call is only to identity servers
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# provided by a client
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data = await self._http_client.post_json_get_json(
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bind_url, bind_data, headers=headers
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)
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# Remember where we bound the threepid
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await self.store.add_user_bound_threepid(
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user_id=mxid,
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medium=data["medium"],
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address=data["address"],
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id_server=id_server,
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)
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return data
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except HttpResponseException as e:
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logger.error("3PID bind failed with Matrix error: %r", e)
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raise e.to_synapse_error()
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except RequestTimedOutError:
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raise SynapseError(500, "Timed out contacting identity server")
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except CodeMessageException as e:
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data = json_decoder.decode(e.msg) # XXX WAT?
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return data
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async def try_unbind_threepid(
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self, mxid: str, medium: str, address: str, id_server: Optional[str]
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) -> bool:
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"""Attempt to remove a 3PID from one or more identity servers.
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Args:
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mxid: Matrix user ID of binding to be removed
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medium: The medium of the third-party ID.
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address: The address of the third-party ID.
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id_server: An identity server to attempt to unbind from. If None,
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attempt to remove the association from all identity servers
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known to potentially have it.
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Raises:
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SynapseError: If we failed to contact one or more identity servers.
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Returns:
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True on success, otherwise False if the identity server doesn't
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support unbinding (or no identity server to contact was found).
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"""
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if id_server:
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id_servers = [id_server]
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else:
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id_servers = await self.store.get_id_servers_user_bound(
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mxid, medium, address
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)
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# We don't know where to unbind, so we don't have a choice but to return
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if not id_servers:
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return False
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changed = True
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for id_server in id_servers:
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changed &= await self._try_unbind_threepid_with_id_server(
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mxid, medium, address, id_server
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)
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return changed
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async def _try_unbind_threepid_with_id_server(
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self, mxid: str, medium: str, address: str, id_server: str
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) -> bool:
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"""Removes a binding from an identity server
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Args:
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mxid: Matrix user ID of binding to be removed
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medium: The medium of the third-party ID
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address: The address of the third-party ID
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id_server: Identity server to unbind from
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Raises:
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SynapseError: On any of the following conditions
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- the supplied id_server is not a valid identity server name
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- we failed to contact the supplied identity server
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Returns:
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True on success, otherwise False if the identity
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server doesn't support unbinding
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"""
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if not valid_id_server_location(id_server):
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raise SynapseError(
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400,
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"id_server must be a valid hostname with optional port and path components",
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)
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url = "https://%s/_matrix/identity/v2/3pid/unbind" % (id_server,)
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url_bytes = b"/_matrix/identity/v2/3pid/unbind"
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content = {
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"mxid": mxid,
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"threepid": {"medium": medium, "address": address},
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}
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# we abuse the federation http client to sign the request, but we have to send it
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# using the normal http client since we don't want the SRV lookup and want normal
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# 'browser-like' HTTPS.
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auth_headers = self.federation_http_client.build_auth_headers(
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destination=None,
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method=b"POST",
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url_bytes=url_bytes,
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content=content,
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destination_is=id_server.encode("ascii"),
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)
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headers = {b"Authorization": auth_headers}
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try:
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# Use the blacklisting http client as this call is only to identity servers
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# provided by a client
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await self._http_client.post_json_get_json(url, content, headers)
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changed = True
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except HttpResponseException as e:
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changed = False
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if e.code in (400, 404, 501):
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# The remote server probably doesn't support unbinding (yet)
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logger.warning("Received %d response while unbinding threepid", e.code)
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else:
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logger.error("Failed to unbind threepid on identity server: %s", e)
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raise SynapseError(500, "Failed to contact identity server")
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except RequestTimedOutError:
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raise SynapseError(500, "Timed out contacting identity server")
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await self.store.remove_user_bound_threepid(mxid, medium, address, id_server)
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return changed
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async def send_threepid_validation(
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self,
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email_address: str,
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client_secret: str,
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send_attempt: int,
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send_email_func: Callable[[str, str, str, str], Awaitable],
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next_link: Optional[str] = None,
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) -> str:
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"""Send a threepid validation email for password reset or
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registration purposes
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Args:
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email_address: The user's email address
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client_secret: The provided client secret
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send_attempt: Which send attempt this is
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send_email_func: A function that takes an email address, token,
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client_secret and session_id, sends an email
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and returns an Awaitable.
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next_link: The URL to redirect the user to after validation
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Returns:
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The new session_id upon success
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Raises:
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SynapseError is an error occurred when sending the email
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"""
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# Check that this email/client_secret/send_attempt combo is new or
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# greater than what we've seen previously
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session = await self.store.get_threepid_validation_session(
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"email", client_secret, address=email_address, validated=False
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)
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# Check to see if a session already exists and that it is not yet
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# marked as validated
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if session and session.validated_at is None:
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session_id = session.session_id
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last_send_attempt = session.last_send_attempt
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# Check that the send_attempt is higher than previous attempts
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if send_attempt <= last_send_attempt:
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# If not, just return a success without sending an email
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return session_id
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else:
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# An non-validated session does not exist yet.
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# Generate a session id
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session_id = random_string(16)
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if next_link:
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# Manipulate the next_link to add the sid, because the caller won't get
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# it until we send a response, by which time we've sent the mail.
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if "?" in next_link:
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next_link += "&"
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else:
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next_link += "?"
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next_link += "sid=" + urllib.parse.quote(session_id)
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# Generate a new validation token
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token = random_string(32)
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# Send the mail with the link containing the token, client_secret
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# and session_id
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try:
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await send_email_func(email_address, token, client_secret, session_id)
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except Exception:
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logger.exception(
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"Error sending threepid validation email to %s", email_address
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)
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raise SynapseError(500, "An error was encountered when sending the email")
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token_expires = (
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self.hs.get_clock().time_msec()
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+ self.hs.config.email.email_validation_token_lifetime
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)
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await self.store.start_or_continue_validation_session(
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"email",
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email_address,
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session_id,
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client_secret,
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send_attempt,
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next_link,
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token,
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token_expires,
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)
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return session_id
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async def requestMsisdnToken(
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self,
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id_server: str,
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country: str,
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phone_number: str,
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client_secret: str,
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send_attempt: int,
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next_link: Optional[str] = None,
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) -> JsonDict:
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"""
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Request an external server send an SMS message on our behalf for the purposes of
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threepid validation.
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Args:
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id_server: The identity server to proxy to
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country: The country code of the phone number
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phone_number: The number to send the message to
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client_secret: The unique client_secret sends by the user
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send_attempt: Which attempt this is
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next_link: A link to redirect the user to once they submit the token
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Returns:
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The json response body from the server
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"""
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params = {
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"country": country,
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"phone_number": phone_number,
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"client_secret": client_secret,
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"send_attempt": send_attempt,
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}
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if next_link:
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params["next_link"] = next_link
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try:
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data = await self.http_client.post_json_get_json(
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id_server + "/_matrix/identity/api/v1/validate/msisdn/requestToken",
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params,
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)
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except HttpResponseException as e:
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logger.info("Proxied requestToken failed: %r", e)
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raise e.to_synapse_error()
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except RequestTimedOutError:
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raise SynapseError(500, "Timed out contacting identity server")
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# we need to tell the client to send the token back to us, since it doesn't
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# otherwise know where to send it, so add submit_url response parameter
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# (see also MSC2078)
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data["submit_url"] = (
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self.hs.config.server.public_baseurl
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+ "_matrix/client/unstable/add_threepid/msisdn/submit_token"
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)
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return data
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async def validate_threepid_session(
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self, client_secret: str, sid: str
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) -> Optional[JsonDict]:
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"""Validates a threepid session with only the client secret and session ID
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Tries validating against any configured account_threepid_delegates as well as locally.
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Args:
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client_secret: A secret provided by the client
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sid: The ID of the session
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Returns:
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The json response if validation was successful, otherwise None
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"""
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# XXX: We shouldn't need to keep wrapping and unwrapping this value
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threepid_creds = {"client_secret": client_secret, "sid": sid}
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# We don't actually know which medium this 3PID is. Thus we first assume it's email,
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# and if validation fails we try msisdn
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# Try to validate as email
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if self.hs.config.email.can_verify_email:
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# Get a validated session matching these details
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validation_session = await self.store.get_threepid_validation_session(
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"email", client_secret, sid=sid, validated=True
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)
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if validation_session:
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return attr.asdict(validation_session)
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# Try to validate as msisdn
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if self.hs.config.registration.account_threepid_delegate_msisdn:
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# Ask our delegated msisdn identity server
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return await self.threepid_from_creds(
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self.hs.config.registration.account_threepid_delegate_msisdn,
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threepid_creds,
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)
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return None
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async def proxy_msisdn_submit_token(
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self, id_server: str, client_secret: str, sid: str, token: str
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) -> JsonDict:
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"""Proxy a POST submitToken request to an identity server for verification purposes
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Args:
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id_server: The identity server URL to contact
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client_secret: Secret provided by the client
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sid: The ID of the session
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token: The verification token
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Raises:
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SynapseError: If we failed to contact the identity server
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Returns:
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The response dict from the identity server
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"""
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body = {"client_secret": client_secret, "sid": sid, "token": token}
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|
|
try:
|
|
return await self.http_client.post_json_get_json(
|
|
id_server + "/_matrix/identity/api/v1/validate/msisdn/submitToken",
|
|
body,
|
|
)
|
|
except RequestTimedOutError:
|
|
raise SynapseError(500, "Timed out contacting identity server")
|
|
except HttpResponseException as e:
|
|
logger.warning("Error contacting msisdn account_threepid_delegate: %s", e)
|
|
raise SynapseError(400, "Error contacting the identity server")
|
|
|
|
async def lookup_3pid(
|
|
self, id_server: str, medium: str, address: str, id_access_token: str
|
|
) -> Optional[str]:
|
|
"""Looks up a 3pid in the passed identity server.
|
|
|
|
Args:
|
|
id_server: The server name (including port, if required)
|
|
of the identity server to use.
|
|
medium: The type of the third party identifier (e.g. "email").
|
|
address: The third party identifier (e.g. "foo@example.com").
|
|
id_access_token: The access token to authenticate to the identity
|
|
server with
|
|
|
|
Returns:
|
|
the matrix ID of the 3pid, or None if it is not recognized.
|
|
"""
|
|
|
|
try:
|
|
results = await self._lookup_3pid_v2(
|
|
id_server, id_access_token, medium, address
|
|
)
|
|
return results
|
|
except Exception as e:
|
|
logger.warning("Error when looking up hashing details: %s", e)
|
|
return None
|
|
|
|
async def _lookup_3pid_v2(
|
|
self, id_server: str, id_access_token: str, medium: str, address: str
|
|
) -> Optional[str]:
|
|
"""Looks up a 3pid in the passed identity server using v2 lookup.
|
|
|
|
Args:
|
|
id_server: The server name (including port, if required)
|
|
of the identity server to use.
|
|
id_access_token: The access token to authenticate to the identity server with
|
|
medium: The type of the third party identifier (e.g. "email").
|
|
address: The third party identifier (e.g. "foo@example.com").
|
|
|
|
Returns:
|
|
the matrix ID of the 3pid, or None if it is not recognised.
|
|
"""
|
|
# Check what hashing details are supported by this identity server
|
|
try:
|
|
hash_details = await self._http_client.get_json(
|
|
"%s%s/_matrix/identity/v2/hash_details" % (id_server_scheme, id_server),
|
|
{"access_token": id_access_token},
|
|
)
|
|
except RequestTimedOutError:
|
|
raise SynapseError(500, "Timed out contacting identity server")
|
|
|
|
if not isinstance(hash_details, dict):
|
|
logger.warning(
|
|
"Got non-dict object when checking hash details of %s%s: %s",
|
|
id_server_scheme,
|
|
id_server,
|
|
hash_details,
|
|
)
|
|
raise SynapseError(
|
|
400,
|
|
"Non-dict object from %s%s during v2 hash_details request: %s"
|
|
% (id_server_scheme, id_server, hash_details),
|
|
)
|
|
|
|
# Extract information from hash_details
|
|
supported_lookup_algorithms = hash_details.get("algorithms")
|
|
lookup_pepper = hash_details.get("lookup_pepper")
|
|
if (
|
|
not supported_lookup_algorithms
|
|
or not isinstance(supported_lookup_algorithms, list)
|
|
or not lookup_pepper
|
|
or not isinstance(lookup_pepper, str)
|
|
):
|
|
raise SynapseError(
|
|
400,
|
|
"Invalid hash details received from identity server %s%s: %s"
|
|
% (id_server_scheme, id_server, hash_details),
|
|
)
|
|
|
|
# Check if any of the supported lookup algorithms are present
|
|
if LookupAlgorithm.SHA256 in supported_lookup_algorithms:
|
|
# Perform a hashed lookup
|
|
lookup_algorithm = LookupAlgorithm.SHA256
|
|
|
|
# Hash address, medium and the pepper with sha256
|
|
to_hash = "%s %s %s" % (address, medium, lookup_pepper)
|
|
lookup_value = sha256_and_url_safe_base64(to_hash)
|
|
|
|
elif LookupAlgorithm.NONE in supported_lookup_algorithms:
|
|
# Perform a non-hashed lookup
|
|
lookup_algorithm = LookupAlgorithm.NONE
|
|
|
|
# Combine together plaintext address and medium
|
|
lookup_value = "%s %s" % (address, medium)
|
|
|
|
else:
|
|
logger.warning(
|
|
"None of the provided lookup algorithms of %s are supported: %s",
|
|
id_server,
|
|
supported_lookup_algorithms,
|
|
)
|
|
raise SynapseError(
|
|
400,
|
|
"Provided identity server does not support any v2 lookup "
|
|
"algorithms that this homeserver supports.",
|
|
)
|
|
|
|
# Authenticate with identity server given the access token from the client
|
|
headers = {"Authorization": create_id_access_token_header(id_access_token)}
|
|
|
|
try:
|
|
lookup_results = await self._http_client.post_json_get_json(
|
|
"%s%s/_matrix/identity/v2/lookup" % (id_server_scheme, id_server),
|
|
{
|
|
"addresses": [lookup_value],
|
|
"algorithm": lookup_algorithm,
|
|
"pepper": lookup_pepper,
|
|
},
|
|
headers=headers,
|
|
)
|
|
except RequestTimedOutError:
|
|
raise SynapseError(500, "Timed out contacting identity server")
|
|
except Exception as e:
|
|
logger.warning("Error when performing a v2 3pid lookup: %s", e)
|
|
raise SynapseError(
|
|
500, "Unknown error occurred during identity server lookup"
|
|
)
|
|
|
|
# Check for a mapping from what we looked up to an MXID
|
|
if "mappings" not in lookup_results or not isinstance(
|
|
lookup_results["mappings"], dict
|
|
):
|
|
logger.warning("No results from 3pid lookup")
|
|
return None
|
|
|
|
# Return the MXID if it's available, or None otherwise
|
|
mxid = lookup_results["mappings"].get(lookup_value)
|
|
return mxid
|
|
|
|
async def ask_id_server_for_third_party_invite(
|
|
self,
|
|
requester: Requester,
|
|
id_server: str,
|
|
medium: str,
|
|
address: str,
|
|
room_id: str,
|
|
inviter_user_id: str,
|
|
room_alias: str,
|
|
room_avatar_url: str,
|
|
room_join_rules: str,
|
|
room_name: str,
|
|
room_type: Optional[str],
|
|
inviter_display_name: str,
|
|
inviter_avatar_url: str,
|
|
id_access_token: str,
|
|
) -> Tuple[str, List[Dict[str, str]], Dict[str, str], str]:
|
|
"""
|
|
Asks an identity server for a third party invite.
|
|
|
|
Args:
|
|
requester
|
|
id_server: hostname + optional port for the identity server.
|
|
medium: The literal string "email".
|
|
address: The third party address being invited.
|
|
room_id: The ID of the room to which the user is invited.
|
|
inviter_user_id: The user ID of the inviter.
|
|
room_alias: An alias for the room, for cosmetic notifications.
|
|
room_avatar_url: The URL of the room's avatar, for cosmetic
|
|
notifications.
|
|
room_join_rules: The join rules of the email (e.g. "public").
|
|
room_name: The m.room.name of the room.
|
|
room_type: The type of the room from its m.room.create event (e.g "m.space").
|
|
inviter_display_name: The current display name of the
|
|
inviter.
|
|
inviter_avatar_url: The URL of the inviter's avatar.
|
|
id_access_token: The access token to authenticate to the identity
|
|
server with
|
|
|
|
Returns:
|
|
A tuple containing:
|
|
token: The token which must be signed to prove authenticity.
|
|
public_keys ([{"public_key": str, "key_validity_url": str}]):
|
|
public_key is a base64-encoded ed25519 public key.
|
|
fallback_public_key: One element from public_keys.
|
|
display_name: A user-friendly name to represent the invited user.
|
|
"""
|
|
invite_config = {
|
|
"medium": medium,
|
|
"address": address,
|
|
"room_id": room_id,
|
|
"room_alias": room_alias,
|
|
"room_avatar_url": room_avatar_url,
|
|
"room_join_rules": room_join_rules,
|
|
"room_name": room_name,
|
|
"sender": inviter_user_id,
|
|
"sender_display_name": inviter_display_name,
|
|
"sender_avatar_url": inviter_avatar_url,
|
|
}
|
|
|
|
if room_type is not None:
|
|
invite_config["room_type"] = room_type
|
|
|
|
# If a custom web client location is available, include it in the request.
|
|
if self._web_client_location:
|
|
invite_config["org.matrix.web_client_location"] = self._web_client_location
|
|
|
|
# Add the identity service access token to the JSON body and use the v2
|
|
# Identity Service endpoints
|
|
data = None
|
|
|
|
key_validity_url = "%s%s/_matrix/identity/v2/pubkey/isvalid" % (
|
|
id_server_scheme,
|
|
id_server,
|
|
)
|
|
|
|
url = "%s%s/_matrix/identity/v2/store-invite" % (id_server_scheme, id_server)
|
|
try:
|
|
data = await self._http_client.post_json_get_json(
|
|
url,
|
|
invite_config,
|
|
{"Authorization": create_id_access_token_header(id_access_token)},
|
|
)
|
|
except RequestTimedOutError:
|
|
raise SynapseError(500, "Timed out contacting identity server")
|
|
|
|
token = data["token"]
|
|
public_keys = data.get("public_keys", [])
|
|
if "public_key" in data:
|
|
fallback_public_key = {
|
|
"public_key": data["public_key"],
|
|
"key_validity_url": key_validity_url,
|
|
}
|
|
else:
|
|
fallback_public_key = public_keys[0]
|
|
|
|
if not public_keys:
|
|
public_keys.append(fallback_public_key)
|
|
display_name = data["display_name"]
|
|
return token, public_keys, fallback_public_key, display_name
|
|
|
|
|
|
def create_id_access_token_header(id_access_token: str) -> List[str]:
|
|
"""Create an Authorization header for passing to SimpleHttpClient as the header value
|
|
of an HTTP request.
|
|
|
|
Args:
|
|
id_access_token: An identity server access token.
|
|
|
|
Returns:
|
|
The ascii-encoded bearer token encased in a list.
|
|
"""
|
|
# Prefix with Bearer
|
|
bearer_token = "Bearer %s" % id_access_token
|
|
|
|
# Encode headers to standard ascii
|
|
bearer_token.encode("ascii")
|
|
|
|
# Return as a list as that's how SimpleHttpClient takes header values
|
|
return [bearer_token]
|
|
|
|
|
|
class LookupAlgorithm:
|
|
"""
|
|
Supported hashing algorithms when performing a 3PID lookup.
|
|
|
|
SHA256 - Hashing an (address, medium, pepper) combo with sha256, then url-safe base64
|
|
encoding
|
|
NONE - Not performing any hashing. Simply sending an (address, medium) combo in plaintext
|
|
"""
|
|
|
|
SHA256 = "sha256"
|
|
NONE = "none"
|