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anonymousland-synapse/synapse/handlers/sso.py
Patrick Cloke 7fbf42499d
Use getClientAddress instead of getClientIP. (#12599) 
getClientIP was deprecated in Twisted 18.4.0, which also added
getClientAddress. The Synapse minimum version for Twisted is
currently 18.9.0, so all supported versions have the new API.
2022-05-04 14:11:21 -04:00

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# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import logging
from typing import (
TYPE_CHECKING,
Any,
Awaitable,
Callable,
Collection,
Dict,
Iterable,
List,
Mapping,
Optional,
Set,
)
from urllib.parse import urlencode
import attr
from typing_extensions import NoReturn, Protocol
from twisted.web.iweb import IRequest
from twisted.web.server import Request
from synapse.api.constants import LoginType
from synapse.api.errors import Codes, NotFoundError, RedirectException, SynapseError
from synapse.config.sso import SsoAttributeRequirement
from synapse.handlers.register import init_counters_for_auth_provider
from synapse.handlers.ui_auth import UIAuthSessionDataConstants
from synapse.http import get_request_user_agent
from synapse.http.server import respond_with_html, respond_with_redirect
from synapse.http.site import SynapseRequest
from synapse.types import (
JsonDict,
UserID,
contains_invalid_mxid_characters,
create_requester,
)
from synapse.util.async_helpers import Linearizer
from synapse.util.stringutils import random_string
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class MappingException(Exception):
"""Used to catch errors when mapping an SSO response to user attributes.
Note that the msg that is raised is shown to end-users.
"""
class SsoIdentityProvider(Protocol):
"""Abstract base class to be implemented by SSO Identity Providers
An Identity Provider, or IdP, is an external HTTP service which authenticates a user
to say whether they should be allowed to log in, or perform a given action.
Synapse supports various implementations of IdPs, including OpenID Connect, SAML,
and CAS.
The main entry point is `handle_redirect_request`, which should return a URI to
redirect the user's browser to the IdP's authentication page.
Each IdP should be registered with the SsoHandler via
`hs.get_sso_handler().register_identity_provider()`, so that requests to
`/_matrix/client/r0/login/sso/redirect` can be correctly dispatched.
"""
@property
@abc.abstractmethod
def idp_id(self) -> str:
"""A unique identifier for this SSO provider
Eg, "saml", "cas", "github"
"""
@property
@abc.abstractmethod
def idp_name(self) -> str:
"""User-facing name for this provider"""
@property
def idp_icon(self) -> Optional[str]:
"""Optional MXC URI for user-facing icon"""
return None
@property
def idp_brand(self) -> Optional[str]:
"""Optional branding identifier"""
return None
@abc.abstractmethod
async def handle_redirect_request(
self,
request: SynapseRequest,
client_redirect_url: Optional[bytes],
ui_auth_session_id: Optional[str] = None,
) -> str:
"""Handle an incoming request to /login/sso/redirect
Args:
request: the incoming HTTP request
client_redirect_url: the URL that we should redirect the
client to after login (or None for UI Auth).
ui_auth_session_id: The session ID of the ongoing UI Auth (or
None if this is a login).
Returns:
URL to redirect to
"""
raise NotImplementedError()
@attr.s(auto_attribs=True)
class UserAttributes:
# the localpart of the mxid that the mapper has assigned to the user.
# if `None`, the mapper has not picked a userid, and the user should be prompted to
# enter one.
localpart: Optional[str]
confirm_localpart: bool = False
display_name: Optional[str] = None
emails: Collection[str] = attr.Factory(list)
@attr.s(slots=True, auto_attribs=True)
class UsernameMappingSession:
"""Data we track about SSO sessions"""
# A unique identifier for this SSO provider, e.g. "oidc" or "saml".
auth_provider_id: str
# user ID on the IdP server
remote_user_id: str
# attributes returned by the ID mapper
display_name: Optional[str]
emails: Collection[str]
# An optional dictionary of extra attributes to be provided to the client in the
# login response.
extra_login_attributes: Optional[JsonDict]
# where to redirect the client back to
client_redirect_url: str
# expiry time for the session, in milliseconds
expiry_time_ms: int
# choices made by the user
chosen_localpart: Optional[str] = None
use_display_name: bool = True
emails_to_use: Collection[str] = ()
terms_accepted_version: Optional[str] = None
# the HTTP cookie used to track the mapping session id
USERNAME_MAPPING_SESSION_COOKIE_NAME = b"username_mapping_session"
class SsoHandler:
# The number of attempts to ask the mapping provider for when generating an MXID.
_MAP_USERNAME_RETRIES = 1000
# the time a UsernameMappingSession remains valid for
_MAPPING_SESSION_VALIDITY_PERIOD_MS = 15 * 60 * 1000
def __init__(self, hs: "HomeServer"):
self._clock = hs.get_clock()
self._store = hs.get_datastores().main
self._server_name = hs.hostname
self._registration_handler = hs.get_registration_handler()
self._auth_handler = hs.get_auth_handler()
self._error_template = hs.config.sso.sso_error_template
self._bad_user_template = hs.config.sso.sso_auth_bad_user_template
self._profile_handler = hs.get_profile_handler()
# The following template is shown after a successful user interactive
# authentication session. It tells the user they can close the window.
self._sso_auth_success_template = hs.config.sso.sso_auth_success_template
self._sso_update_profile_information = (
hs.config.sso.sso_update_profile_information
)
# a lock on the mappings
self._mapping_lock = Linearizer(name="sso_user_mapping", clock=hs.get_clock())
# a map from session id to session data
self._username_mapping_sessions: Dict[str, UsernameMappingSession] = {}
# map from idp_id to SsoIdentityProvider
self._identity_providers: Dict[str, SsoIdentityProvider] = {}
self._consent_at_registration = hs.config.consent.user_consent_at_registration
def register_identity_provider(self, p: SsoIdentityProvider) -> None:
p_id = p.idp_id
assert p_id not in self._identity_providers
self._identity_providers[p_id] = p
init_counters_for_auth_provider(p_id)
def get_identity_providers(self) -> Mapping[str, SsoIdentityProvider]:
"""Get the configured identity providers"""
return self._identity_providers
async def get_identity_providers_for_user(
self, user_id: str
) -> Mapping[str, SsoIdentityProvider]:
"""Get the SsoIdentityProviders which a user has used
Given a user id, get the identity providers that that user has used to log in
with in the past (and thus could use to re-identify themselves for UI Auth).
Args:
user_id: MXID of user to look up
Raises:
a map of idp_id to SsoIdentityProvider
"""
external_ids = await self._store.get_external_ids_by_user(user_id)
valid_idps = {}
for idp_id, _ in external_ids:
idp = self._identity_providers.get(idp_id)
if not idp:
logger.warning(
"User %r has an SSO mapping for IdP %r, but this is no longer "
"configured.",
user_id,
idp_id,
)
else:
valid_idps[idp_id] = idp
return valid_idps
def render_error(
self,
request: Request,
error: str,
error_description: Optional[str] = None,
code: int = 400,
) -> None:
"""Renders the error template and responds with it.
This is used to show errors to the user. The template of this page can
be found under `synapse/res/templates/sso_error.html`.
Args:
request: The incoming request from the browser.
We'll respond with an HTML page describing the error.
error: A technical identifier for this error.
error_description: A human-readable description of the error.
code: The integer error code (an HTTP response code)
"""
html = self._error_template.render(
error=error, error_description=error_description
)
respond_with_html(request, code, html)
async def handle_redirect_request(
self,
request: SynapseRequest,
client_redirect_url: bytes,
idp_id: Optional[str],
) -> str:
"""Handle a request to /login/sso/redirect
Args:
request: incoming HTTP request
client_redirect_url: the URL that we should redirect the
client to after login.
idp_id: optional identity provider chosen by the client
Returns:
the URI to redirect to
"""
if not self._identity_providers:
raise SynapseError(
400, "Homeserver not configured for SSO.", errcode=Codes.UNRECOGNIZED
)
# if the client chose an IdP, use that
idp: Optional[SsoIdentityProvider] = None
if idp_id:
idp = self._identity_providers.get(idp_id)
if not idp:
raise NotFoundError("Unknown identity provider")
# if we only have one auth provider, redirect to it directly
elif len(self._identity_providers) == 1:
idp = next(iter(self._identity_providers.values()))
if idp:
return await idp.handle_redirect_request(request, client_redirect_url)
# otherwise, redirect to the IDP picker
return "/_synapse/client/pick_idp?" + urlencode(
(("redirectUrl", client_redirect_url),)
)
async def get_sso_user_by_remote_user_id(
self, auth_provider_id: str, remote_user_id: str
) -> Optional[str]:
"""
Maps the user ID of a remote IdP to a mxid for a previously seen user.
If the user has not been seen yet, this will return None.
Args:
auth_provider_id: A unique identifier for this SSO provider, e.g.
"oidc" or "saml".
remote_user_id: The user ID according to the remote IdP. This might
be an e-mail address, a GUID, or some other form. It must be
unique and immutable.
Returns:
The mxid of a previously seen user.
"""
logger.debug(
"Looking for existing mapping for user %s:%s",
auth_provider_id,
remote_user_id,
)
# Check if we already have a mapping for this user.
previously_registered_user_id = await self._store.get_user_by_external_id(
auth_provider_id,
remote_user_id,
)
# A match was found, return the user ID.
if previously_registered_user_id is not None:
logger.info(
"Found existing mapping for IdP '%s' and remote_user_id '%s': %s",
auth_provider_id,
remote_user_id,
previously_registered_user_id,
)
return previously_registered_user_id
# No match.
return None
async def complete_sso_login_request(
self,
auth_provider_id: str,
remote_user_id: str,
request: SynapseRequest,
client_redirect_url: str,
sso_to_matrix_id_mapper: Callable[[int], Awaitable[UserAttributes]],
grandfather_existing_users: Callable[[], Awaitable[Optional[str]]],
extra_login_attributes: Optional[JsonDict] = None,
auth_provider_session_id: Optional[str] = None,
) -> None:
"""
Given an SSO ID, retrieve the user ID for it and possibly register the user.
This first checks if the SSO ID has previously been linked to a matrix ID,
if it has that matrix ID is returned regardless of the current mapping
logic.
If a callable is provided for grandfathering users, it is called and can
potentially return a matrix ID to use. If it does, the SSO ID is linked to
this matrix ID for subsequent calls.
The mapping function is called (potentially multiple times) to generate
a localpart for the user.
If an unused localpart is generated, the user is registered from the
given user-agent and IP address and the SSO ID is linked to this matrix
ID for subsequent calls.
Finally, we generate a redirect to the supplied redirect uri, with a login token
Args:
auth_provider_id: A unique identifier for this SSO provider, e.g.
"oidc" or "saml".
remote_user_id: The unique identifier from the SSO provider.
request: The request to respond to
client_redirect_url: The redirect URL passed in by the client.
sso_to_matrix_id_mapper: A callable to generate the user attributes.
The only parameter is an integer which represents the amount of
times the returned mxid localpart mapping has failed.
It is expected that the mapper can raise two exceptions, which
will get passed through to the caller:
MappingException if there was a problem mapping the response
to the user.
RedirectException to redirect to an additional page (e.g.
to prompt the user for more information).
grandfather_existing_users: A callable which can return an previously
existing matrix ID. The SSO ID is then linked to the returned
matrix ID.
extra_login_attributes: An optional dictionary of extra
attributes to be provided to the client in the login response.
auth_provider_session_id: An optional session ID from the IdP.
Raises:
MappingException if there was a problem mapping the response to a user.
RedirectException: if the mapping provider needs to redirect the user
to an additional page. (e.g. to prompt for more information)
"""
new_user = False
# grab a lock while we try to find a mapping for this user. This seems...
# optimistic, especially for implementations that end up redirecting to
# interstitial pages.
async with self._mapping_lock.queue(auth_provider_id):
# first of all, check if we already have a mapping for this user
user_id = await self.get_sso_user_by_remote_user_id(
auth_provider_id,
remote_user_id,
)
# Check for grandfathering of users.
if not user_id:
user_id = await grandfather_existing_users()
if user_id:
# Future logins should also match this user ID.
await self._store.record_user_external_id(
auth_provider_id, remote_user_id, user_id
)
# Otherwise, generate a new user.
if not user_id:
attributes = await self._call_attribute_mapper(sso_to_matrix_id_mapper)
next_step_url = self._get_url_for_next_new_user_step(
attributes=attributes
)
if next_step_url:
await self._redirect_to_next_new_user_step(
auth_provider_id,
remote_user_id,
attributes,
client_redirect_url,
next_step_url,
extra_login_attributes,
)
user_id = await self._register_mapped_user(
attributes,
auth_provider_id,
remote_user_id,
get_request_user_agent(request),
request.getClientAddress().host,
)
new_user = True
elif self._sso_update_profile_information:
attributes = await self._call_attribute_mapper(sso_to_matrix_id_mapper)
if attributes.display_name:
user_id_obj = UserID.from_string(user_id)
profile_display_name = await self._profile_handler.get_displayname(
user_id_obj
)
if profile_display_name != attributes.display_name:
requester = create_requester(
user_id,
authenticated_entity=user_id,
)
await self._profile_handler.set_displayname(
user_id_obj, requester, attributes.display_name, True
)
await self._auth_handler.complete_sso_login(
user_id,
auth_provider_id,
request,
client_redirect_url,
extra_login_attributes,
new_user=new_user,
auth_provider_session_id=auth_provider_session_id,
)
async def _call_attribute_mapper(
self,
sso_to_matrix_id_mapper: Callable[[int], Awaitable[UserAttributes]],
) -> UserAttributes:
"""Call the attribute mapper function in a loop, until we get a unique userid"""
for i in range(self._MAP_USERNAME_RETRIES):
try:
attributes = await sso_to_matrix_id_mapper(i)
except (RedirectException, MappingException):
# Mapping providers are allowed to issue a redirect (e.g. to ask
# the user for more information) and can issue a mapping exception
# if a name cannot be generated.
raise
except Exception as e:
# Any other exception is unexpected.
raise MappingException(
"Could not extract user attributes from SSO response."
) from e
logger.debug(
"Retrieved user attributes from user mapping provider: %r (attempt %d)",
attributes,
i,
)
if not attributes.localpart:
# the mapper has not picked a localpart
return attributes
# Check if this mxid already exists
user_id = UserID(attributes.localpart, self._server_name).to_string()
if not await self._store.get_users_by_id_case_insensitive(user_id):
# This mxid is free
break
else:
# Unable to generate a username in 1000 iterations
# Break and return error to the user
raise MappingException(
"Unable to generate a Matrix ID from the SSO response"
)
return attributes
def _get_url_for_next_new_user_step(
self,
attributes: Optional[UserAttributes] = None,
session: Optional[UsernameMappingSession] = None,
) -> bytes:
"""Returns the URL to redirect to for the next step of new user registration
Given attributes from the user mapping provider or a UsernameMappingSession,
returns the URL to redirect to for the next step of the registration flow.
Args:
attributes: the user attributes returned by the user mapping provider,
from before a UsernameMappingSession has begun.
session: an active UsernameMappingSession, possibly with some of its
attributes chosen by the user.
Returns:
The URL to redirect to, or an empty value if no redirect is necessary
"""
# Must provide either attributes or session, not both
assert (attributes is not None) != (session is not None)
if (
attributes
and (attributes.localpart is None or attributes.confirm_localpart is True)
) or (session and session.chosen_localpart is None):
return b"/_synapse/client/pick_username/account_details"
elif self._consent_at_registration and not (
session and session.terms_accepted_version
):
return b"/_synapse/client/new_user_consent"
else:
return b"/_synapse/client/sso_register" if session else b""
async def _redirect_to_next_new_user_step(
self,
auth_provider_id: str,
remote_user_id: str,
attributes: UserAttributes,
client_redirect_url: str,
next_step_url: bytes,
extra_login_attributes: Optional[JsonDict],
) -> NoReturn:
"""Creates a UsernameMappingSession and redirects the browser
Called if the user mapping provider doesn't return complete information for a new user.
Raises a RedirectException which redirects the browser to a specified URL.
Args:
auth_provider_id: A unique identifier for this SSO provider, e.g.
"oidc" or "saml".
remote_user_id: The unique identifier from the SSO provider.
attributes: the user attributes returned by the user mapping provider.
client_redirect_url: The redirect URL passed in by the client, which we
will eventually redirect back to.
next_step_url: The URL to redirect to for the next step of the new user flow.
extra_login_attributes: An optional dictionary of extra
attributes to be provided to the client in the login response.
Raises:
RedirectException
"""
# TODO: If needed, allow using/looking up an existing session here.
session_id = random_string(16)
now = self._clock.time_msec()
session = UsernameMappingSession(
auth_provider_id=auth_provider_id,
remote_user_id=remote_user_id,
display_name=attributes.display_name,
emails=attributes.emails,
client_redirect_url=client_redirect_url,
expiry_time_ms=now + self._MAPPING_SESSION_VALIDITY_PERIOD_MS,
extra_login_attributes=extra_login_attributes,
# Treat the localpart returned by the user mapping provider as though
# it was chosen by the user. If it's None, it must be chosen eventually.
chosen_localpart=attributes.localpart,
# TODO: Consider letting the user mapping provider specify defaults for
# other user-chosen attributes.
)
self._username_mapping_sessions[session_id] = session
logger.info("Recorded registration session id %s", session_id)
# Set the cookie and redirect to the next step
e = RedirectException(next_step_url)
e.cookies.append(
b"%s=%s; path=/"
% (USERNAME_MAPPING_SESSION_COOKIE_NAME, session_id.encode("ascii"))
)
raise e
async def _register_mapped_user(
self,
attributes: UserAttributes,
auth_provider_id: str,
remote_user_id: str,
user_agent: str,
ip_address: str,
) -> str:
"""Register a new SSO user.
This is called once we have successfully mapped the remote user id onto a local
user id, one way or another.
Args:
attributes: user attributes returned by the user mapping provider,
including a non-empty localpart.
auth_provider_id: A unique identifier for this SSO provider, e.g.
"oidc" or "saml".
remote_user_id: The unique identifier from the SSO provider.
user_agent: The user-agent in the HTTP request (used for potential
shadow-banning.)
ip_address: The IP address of the requester (used for potential
shadow-banning.)
Raises:
a MappingException if the localpart is invalid.
a SynapseError with code 400 and errcode Codes.USER_IN_USE if the localpart
is already taken.
"""
# Since the localpart is provided via a potentially untrusted module,
# ensure the MXID is valid before registering.
if not attributes.localpart or contains_invalid_mxid_characters(
attributes.localpart
):
raise MappingException("localpart is invalid: %s" % (attributes.localpart,))
logger.debug("Mapped SSO user to local part %s", attributes.localpart)
registered_user_id = await self._registration_handler.register_user(
localpart=attributes.localpart,
default_display_name=attributes.display_name,
bind_emails=attributes.emails,
user_agent_ips=[(user_agent, ip_address)],
auth_provider_id=auth_provider_id,
)
await self._store.record_user_external_id(
auth_provider_id, remote_user_id, registered_user_id
)
return registered_user_id
async def complete_sso_ui_auth_request(
self,
auth_provider_id: str,
remote_user_id: str,
ui_auth_session_id: str,
request: Request,
) -> None:
"""
Given an SSO ID, retrieve the user ID for it and complete UIA.
Note that this requires that the user is mapped in the "user_external_ids"
table. This will be the case if they have ever logged in via SAML or OIDC in
recentish synapse versions, but may not be for older users.
Args:
auth_provider_id: A unique identifier for this SSO provider, e.g.
"oidc" or "saml".
remote_user_id: The unique identifier from the SSO provider.
ui_auth_session_id: The ID of the user-interactive auth session.
request: The request to complete.
"""
user_id = await self.get_sso_user_by_remote_user_id(
auth_provider_id,
remote_user_id,
)
user_id_to_verify: str = await self._auth_handler.get_session_data(
ui_auth_session_id, UIAuthSessionDataConstants.REQUEST_USER_ID
)
if not user_id:
logger.warning(
"Remote user %s/%s has not previously logged in here: UIA will fail",
auth_provider_id,
remote_user_id,
)
elif user_id != user_id_to_verify:
logger.warning(
"Remote user %s/%s mapped onto incorrect user %s: UIA will fail",
auth_provider_id,
remote_user_id,
user_id,
)
else:
# success!
# Mark the stage of the authentication as successful.
await self._store.mark_ui_auth_stage_complete(
ui_auth_session_id, LoginType.SSO, user_id
)
# Render the HTML confirmation page and return.
html = self._sso_auth_success_template
respond_with_html(request, 200, html)
return
# the user_id didn't match: mark the stage of the authentication as unsuccessful
await self._store.mark_ui_auth_stage_complete(
ui_auth_session_id, LoginType.SSO, ""
)
# render an error page.
html = self._bad_user_template.render(
server_name=self._server_name,
user_id_to_verify=user_id_to_verify,
)
respond_with_html(request, 200, html)
def get_mapping_session(self, session_id: str) -> UsernameMappingSession:
"""Look up the given username mapping session
If it is not found, raises a SynapseError with an http code of 400
Args:
session_id: session to look up
Returns:
active mapping session
Raises:
SynapseError if the session is not found/has expired
"""
self._expire_old_sessions()
session = self._username_mapping_sessions.get(session_id)
if session:
return session
logger.info("Couldn't find session id %s", session_id)
raise SynapseError(400, "unknown session")
async def check_username_availability(
self,
localpart: str,
session_id: str,
) -> bool:
"""Handle an "is username available" callback check
Args:
localpart: desired localpart
session_id: the session id for the username picker
Returns:
True if the username is available
Raises:
SynapseError if the localpart is invalid or the session is unknown
"""
# make sure that there is a valid mapping session, to stop people dictionary-
# scanning for accounts
self.get_mapping_session(session_id)
logger.info(
"[session %s] Checking for availability of username %s",
session_id,
localpart,
)
if contains_invalid_mxid_characters(localpart):
raise SynapseError(400, "localpart is invalid: %s" % (localpart,))
user_id = UserID(localpart, self._server_name).to_string()
user_infos = await self._store.get_users_by_id_case_insensitive(user_id)
logger.info("[session %s] users: %s", session_id, user_infos)
return not user_infos
async def handle_submit_username_request(
self,
request: SynapseRequest,
session_id: str,
localpart: str,
use_display_name: bool,
emails_to_use: Iterable[str],
) -> None:
"""Handle a request to the username-picker 'submit' endpoint
Will serve an HTTP response to the request.
Args:
request: HTTP request
localpart: localpart requested by the user
session_id: ID of the username mapping session, extracted from a cookie
use_display_name: whether the user wants to use the suggested display name
emails_to_use: emails that the user would like to use
"""
try:
session = self.get_mapping_session(session_id)
except SynapseError as e:
self.render_error(request, "bad_session", e.msg, code=e.code)
return
# update the session with the user's choices
session.chosen_localpart = localpart
session.use_display_name = use_display_name
emails_from_idp = set(session.emails)
filtered_emails: Set[str] = set()
# we iterate through the list rather than just building a set conjunction, so
# that we can log attempts to use unknown addresses
for email in emails_to_use:
if email in emails_from_idp:
filtered_emails.add(email)
else:
logger.warning(
"[session %s] ignoring user request to use unknown email address %r",
session_id,
email,
)
session.emails_to_use = filtered_emails
respond_with_redirect(
request, self._get_url_for_next_new_user_step(session=session)
)
async def handle_terms_accepted(
self, request: Request, session_id: str, terms_version: str
) -> None:
"""Handle a request to the new-user 'consent' endpoint
Will serve an HTTP response to the request.
Args:
request: HTTP request
session_id: ID of the username mapping session, extracted from a cookie
terms_version: the version of the terms which the user viewed and consented
to
"""
logger.info(
"[session %s] User consented to terms version %s",
session_id,
terms_version,
)
try:
session = self.get_mapping_session(session_id)
except SynapseError as e:
self.render_error(request, "bad_session", e.msg, code=e.code)
return
session.terms_accepted_version = terms_version
respond_with_redirect(
request, self._get_url_for_next_new_user_step(session=session)
)
async def register_sso_user(self, request: Request, session_id: str) -> None:
"""Called once we have all the info we need to register a new user.
Does so and serves an HTTP response
Args:
request: HTTP request
session_id: ID of the username mapping session, extracted from a cookie
"""
try:
session = self.get_mapping_session(session_id)
except SynapseError as e:
self.render_error(request, "bad_session", e.msg, code=e.code)
return
logger.info(
"[session %s] Registering localpart %s",
session_id,
session.chosen_localpart,
)
attributes = UserAttributes(
localpart=session.chosen_localpart,
emails=session.emails_to_use,
)
if session.use_display_name:
attributes.display_name = session.display_name
# the following will raise a 400 error if the username has been taken in the
# meantime.
user_id = await self._register_mapped_user(
attributes,
session.auth_provider_id,
session.remote_user_id,
get_request_user_agent(request),
request.getClientAddress().host,
)
logger.info(
"[session %s] Registered userid %s with attributes %s",
session_id,
user_id,
attributes,
)
# delete the mapping session and the cookie
del self._username_mapping_sessions[session_id]
# delete the cookie
request.addCookie(
USERNAME_MAPPING_SESSION_COOKIE_NAME,
b"",
expires=b"Thu, 01 Jan 1970 00:00:00 GMT",
path=b"/",
)
auth_result = {}
if session.terms_accepted_version:
# TODO: make this less awful.
auth_result[LoginType.TERMS] = True
await self._registration_handler.post_registration_actions(
user_id, auth_result, access_token=None
)
await self._auth_handler.complete_sso_login(
user_id,
session.auth_provider_id,
request,
session.client_redirect_url,
session.extra_login_attributes,
new_user=True,
)
def _expire_old_sessions(self) -> None:
to_expire = []
now = int(self._clock.time_msec())
for session_id, session in self._username_mapping_sessions.items():
if session.expiry_time_ms <= now:
to_expire.append(session_id)
for session_id in to_expire:
logger.info("Expiring mapping session %s", session_id)
del self._username_mapping_sessions[session_id]
def check_required_attributes(
self,
request: SynapseRequest,
attributes: Mapping[str, List[Any]],
attribute_requirements: Iterable[SsoAttributeRequirement],
) -> bool:
"""
Confirm that the required attributes were present in the SSO response.
If all requirements are met, this will return True.
If any requirement is not met, then the request will be finalized by
showing an error page to the user and False will be returned.
Args:
request: The request to (potentially) respond to.
attributes: The attributes from the SSO IdP.
attribute_requirements: The requirements that attributes must meet.
Returns:
True if all requirements are met, False if any attribute fails to
meet the requirement.
"""
# Ensure that the attributes of the logged in user meet the required
# attributes.
for requirement in attribute_requirements:
if not _check_attribute_requirement(attributes, requirement):
self.render_error(
request, "unauthorised", "You are not authorised to log in here."
)
return False
return True
def get_username_mapping_session_cookie_from_request(request: IRequest) -> str:
"""Extract the session ID from the cookie
Raises a SynapseError if the cookie isn't found
"""
session_id = request.getCookie(USERNAME_MAPPING_SESSION_COOKIE_NAME)
if not session_id:
raise SynapseError(code=400, msg="missing session_id")
return session_id.decode("ascii", errors="replace")
def _check_attribute_requirement(
attributes: Mapping[str, List[Any]], req: SsoAttributeRequirement
) -> bool:
"""Check if SSO attributes meet the proper requirements.
Args:
attributes: A mapping of attributes to an iterable of one or more values.
requirement: The configured requirement to check.
Returns:
True if the required attribute was found and had a proper value.
"""
if req.attribute not in attributes:
logger.info("SSO attribute missing: %s", req.attribute)
return False
# If the requirement is None, the attribute existing is enough.
if req.value is None:
return True
values = attributes[req.attribute]
if req.value in values:
return True
logger.info(
"SSO attribute %s did not match required value '%s' (was '%s')",
req.attribute,
req.value,
values,
)
return False
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