diff options
Diffstat (limited to 'synapse')
| -rw-r--r-- | synapse/handlers/auth.py | 64 | ||||
| -rw-r--r-- | synapse/module_api/__init__.py | 41 | ||||
| -rw-r--r-- | synapse/rest/client/login.py | 3 | ||||
| -rw-r--r-- | synapse/rest/client/login_token_request.py | 5 | ||||
| -rw-r--r-- | synapse/storage/databases/main/registration.py | 156 | ||||
| -rw-r--r-- | synapse/storage/schema/main/delta/73/10login_tokens.sql | 35 | ||||
| -rw-r--r-- | synapse/util/macaroons.py | 87 |
7 files changed, 249 insertions, 142 deletions
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index f5f0e0e7a7..8b9ef25d29 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -38,6 +38,7 @@ from typing import ( import attr import bcrypt import unpaddedbase64 +from prometheus_client import Counter from twisted.internet.defer import CancelledError from twisted.web.server import Request @@ -48,6 +49,7 @@ from synapse.api.errors import ( Codes, InteractiveAuthIncompleteError, LoginError, + NotFoundError, StoreError, SynapseError, UserDeactivatedError, @@ -63,10 +65,14 @@ from synapse.http.server import finish_request, respond_with_html from synapse.http.site import SynapseRequest from synapse.logging.context import defer_to_thread from synapse.metrics.background_process_metrics import run_as_background_process +from synapse.storage.databases.main.registration import ( + LoginTokenExpired, + LoginTokenLookupResult, + LoginTokenReused, +) from synapse.types import JsonDict, Requester, UserID from synapse.util import stringutils as stringutils from synapse.util.async_helpers import delay_cancellation, maybe_awaitable -from synapse.util.macaroons import LoginTokenAttributes from synapse.util.msisdn import phone_number_to_msisdn from synapse.util.stringutils import base62_encode from synapse.util.threepids import canonicalise_email @@ -80,6 +86,12 @@ logger = logging.getLogger(__name__) INVALID_USERNAME_OR_PASSWORD = "Invalid username or password" +invalid_login_token_counter = Counter( + "synapse_user_login_invalid_login_tokens", + "Counts the number of rejected m.login.token on /login", + ["reason"], +) + def convert_client_dict_legacy_fields_to_identifier( submission: JsonDict, @@ -883,6 +895,25 @@ class AuthHandler: return True + async def create_login_token_for_user_id( + self, + user_id: str, + duration_ms: int = (2 * 60 * 1000), + auth_provider_id: Optional[str] = None, + auth_provider_session_id: Optional[str] = None, + ) -> str: + login_token = self.generate_login_token() + now = self._clock.time_msec() + expiry_ts = now + duration_ms + await self.store.add_login_token_to_user( + user_id=user_id, + token=login_token, + expiry_ts=expiry_ts, + auth_provider_id=auth_provider_id, + auth_provider_session_id=auth_provider_session_id, + ) + return login_token + async def create_refresh_token_for_user_id( self, user_id: str, @@ -1401,6 +1432,18 @@ class AuthHandler: return None return user_id + def generate_login_token(self) -> str: + """Generates an opaque string, for use as an short-term login token""" + + # we use the following format for access tokens: + # syl_<random string>_<base62 crc check> + + random_string = stringutils.random_string(20) + base = f"syl_{random_string}" + + crc = base62_encode(crc32(base.encode("ascii")), minwidth=6) + return f"{base}_{crc}" + def generate_access_token(self, for_user: UserID) -> str: """Generates an opaque string, for use as an access token""" @@ -1427,16 +1470,17 @@ class AuthHandler: crc = base62_encode(crc32(base.encode("ascii")), minwidth=6) return f"{base}_{crc}" - async def validate_short_term_login_token( - self, login_token: str - ) -> LoginTokenAttributes: + async def consume_login_token(self, login_token: str) -> LoginTokenLookupResult: try: - res = self.macaroon_gen.verify_short_term_login_token(login_token) - except Exception: - raise AuthError(403, "Invalid login token", errcode=Codes.FORBIDDEN) + return await self.store.consume_login_token(login_token) + except LoginTokenExpired: + invalid_login_token_counter.labels("expired").inc() + except LoginTokenReused: + invalid_login_token_counter.labels("reused").inc() + except NotFoundError: + invalid_login_token_counter.labels("not found").inc() - await self.auth_blocking.check_auth_blocking(res.user_id) - return res + raise AuthError(403, "Invalid login token", errcode=Codes.FORBIDDEN) async def delete_access_token(self, access_token: str) -> None: """Invalidate a single access token @@ -1711,7 +1755,7 @@ class AuthHandler: ) # Create a login token - login_token = self.macaroon_gen.generate_short_term_login_token( + login_token = await self.create_login_token_for_user_id( registered_user_id, auth_provider_id=auth_provider_id, auth_provider_session_id=auth_provider_session_id, diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py index 6a6ae208d1..30e689d00d 100644 --- a/synapse/module_api/__init__.py +++ b/synapse/module_api/__init__.py @@ -771,50 +771,11 @@ class ModuleApi: auth_provider_session_id: The session ID got during login from the SSO IdP, if any. """ - # The deprecated `generate_short_term_login_token` method defaulted to an empty - # string for the `auth_provider_id` because of how the underlying macaroon was - # generated. This will change to a proper NULL-able field when the tokens get - # moved to the database. - return self._hs.get_macaroon_generator().generate_short_term_login_token( + return await self._hs.get_auth_handler().create_login_token_for_user_id( user_id, - auth_provider_id or "", - auth_provider_session_id, duration_in_ms, - ) - - def generate_short_term_login_token( - self, - user_id: str, - duration_in_ms: int = (2 * 60 * 1000), - auth_provider_id: str = "", - auth_provider_session_id: Optional[str] = None, - ) -> str: - """Generate a login token suitable for m.login.token authentication - - Added in Synapse v1.9.0. - - This was deprecated in Synapse v1.69.0 in favor of create_login_token, and will - be removed in Synapse 1.71.0. - - Args: - user_id: gives the ID of the user that the token is for - - duration_in_ms: the time that the token will be valid for - - auth_provider_id: the ID of the SSO IdP that the user used to authenticate - to get this token, if any. This is encoded in the token so that - /login can report stats on number of successful logins by IdP. - """ - logger.warn( - "A module configured on this server uses ModuleApi.generate_short_term_login_token(), " - "which is deprecated in favor of ModuleApi.create_login_token(), and will be removed in " - "Synapse 1.71.0", - ) - return self._hs.get_macaroon_generator().generate_short_term_login_token( - user_id, auth_provider_id, auth_provider_session_id, - duration_in_ms, ) @defer.inlineCallbacks diff --git a/synapse/rest/client/login.py b/synapse/rest/client/login.py index f554586ac3..7774f1967d 100644 --- a/synapse/rest/client/login.py +++ b/synapse/rest/client/login.py @@ -436,8 +436,7 @@ class LoginRestServlet(RestServlet): The body of the JSON response. """ token = login_submission["token"] - auth_handler = self.auth_handler - res = await auth_handler.validate_short_term_login_token(token) + res = await self.auth_handler.consume_login_token(token) return await self._complete_login( res.user_id, diff --git a/synapse/rest/client/login_token_request.py b/synapse/rest/client/login_token_request.py index 277b20fb63..43ea21d5e6 100644 --- a/synapse/rest/client/login_token_request.py +++ b/synapse/rest/client/login_token_request.py @@ -57,7 +57,6 @@ class LoginTokenRequestServlet(RestServlet): self.store = hs.get_datastores().main self.clock = hs.get_clock() self.server_name = hs.config.server.server_name - self.macaroon_gen = hs.get_macaroon_generator() self.auth_handler = hs.get_auth_handler() self.token_timeout = hs.config.experimental.msc3882_token_timeout self.ui_auth = hs.config.experimental.msc3882_ui_auth @@ -76,10 +75,10 @@ class LoginTokenRequestServlet(RestServlet): can_skip_ui_auth=False, # Don't allow skipping of UI auth ) - login_token = self.macaroon_gen.generate_short_term_login_token( + login_token = await self.auth_handler.create_login_token_for_user_id( user_id=requester.user.to_string(), auth_provider_id="org.matrix.msc3882.login_token_request", - duration_in_ms=self.token_timeout, + duration_ms=self.token_timeout, ) return ( diff --git a/synapse/storage/databases/main/registration.py b/synapse/storage/databases/main/registration.py index 2996d6bb4d..0255295317 100644 --- a/synapse/storage/databases/main/registration.py +++ b/synapse/storage/databases/main/registration.py @@ -21,7 +21,13 @@ from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union, cast import attr from synapse.api.constants import UserTypes -from synapse.api.errors import Codes, StoreError, SynapseError, ThreepidValidationError +from synapse.api.errors import ( + Codes, + NotFoundError, + StoreError, + SynapseError, + ThreepidValidationError, +) from synapse.config.homeserver import HomeServerConfig from synapse.metrics.background_process_metrics import wrap_as_background_process from synapse.storage.database import ( @@ -50,6 +56,14 @@ class ExternalIDReuseException(Exception): because this external id is given to an other user.""" +class LoginTokenExpired(Exception): + """Exception if the login token sent expired""" + + +class LoginTokenReused(Exception): + """Exception if the login token sent was already used""" + + @attr.s(frozen=True, slots=True, auto_attribs=True) class TokenLookupResult: """Result of looking up an access token. @@ -115,6 +129,20 @@ class RefreshTokenLookupResult: If None, the session can be refreshed indefinitely.""" +@attr.s(auto_attribs=True, frozen=True, slots=True) +class LoginTokenLookupResult: + """Result of looking up a login token.""" + + user_id: str + """The user this token belongs to.""" + + auth_provider_id: Optional[str] + """The SSO Identity Provider that the user authenticated with, to get this token.""" + + auth_provider_session_id: Optional[str] + """The session ID advertised by the SSO Identity Provider.""" + + class RegistrationWorkerStore(CacheInvalidationWorkerStore): def __init__( self, @@ -1789,6 +1817,109 @@ class RegistrationWorkerStore(CacheInvalidationWorkerStore): "replace_refresh_token", _replace_refresh_token_txn ) + async def add_login_token_to_user( + self, + user_id: str, + token: str, + expiry_ts: int, + auth_provider_id: Optional[str], + auth_provider_session_id: Optional[str], + ) -> None: + """Adds a short-term login token for the given user. + + Args: + user_id: The user ID. + token: The new login token to add. + expiry_ts (milliseconds since the epoch): Time after which the login token + cannot be used. + auth_provider_id: The SSO Identity Provider that the user authenticated with + to get this token, if any + auth_provider_session_id: The session ID advertised by the SSO Identity + Provider, if any. + """ + await self.db_pool.simple_insert( + "login_tokens", + { + "token": token, + "user_id": user_id, + "expiry_ts": expiry_ts, + "auth_provider_id": auth_provider_id, + "auth_provider_session_id": auth_provider_session_id, + }, + desc="add_login_token_to_user", + ) + + def _consume_login_token( + self, + txn: LoggingTransaction, + token: str, + ts: int, + ) -> LoginTokenLookupResult: + values = self.db_pool.simple_select_one_txn( + txn, + "login_tokens", + keyvalues={"token": token}, + retcols=( + "user_id", + "expiry_ts", + "used_ts", + "auth_provider_id", + "auth_provider_session_id", + ), + allow_none=True, + ) + + if values is None: + raise NotFoundError() + + self.db_pool.simple_update_one_txn( + txn, + "login_tokens", + keyvalues={"token": token}, + updatevalues={"used_ts": ts}, + ) + user_id = values["user_id"] + expiry_ts = values["expiry_ts"] + used_ts = values["used_ts"] + auth_provider_id = values["auth_provider_id"] + auth_provider_session_id = values["auth_provider_session_id"] + + # Token was already used + if used_ts is not None: + raise LoginTokenReused() + + # Token expired + if ts > int(expiry_ts): + raise LoginTokenExpired() + + return LoginTokenLookupResult( + user_id=user_id, + auth_provider_id=auth_provider_id, + auth_provider_session_id=auth_provider_session_id, + ) + + async def consume_login_token(self, token: str) -> LoginTokenLookupResult: + """Lookup a login token and consume it. + + Args: + token: The login token. + + Returns: + The data stored with that token, including the `user_id`. Returns `None` if + the token does not exist or if it expired. + + Raises: + NotFound if the login token was not found in database + LoginTokenExpired if the login token expired + LoginTokenReused if the login token was already used + """ + return await self.db_pool.runInteraction( + "consume_login_token", + self._consume_login_token, + token, + self._clock.time_msec(), + ) + @cached() async def is_guest(self, user_id: str) -> bool: res = await self.db_pool.simple_select_one_onecol( @@ -2019,6 +2150,12 @@ class RegistrationStore(StatsStore, RegistrationBackgroundUpdateStore): and hs.config.experimental.msc3866.require_approval_for_new_accounts ) + # Create a background job for removing expired login tokens + if hs.config.worker.run_background_tasks: + self._clock.looping_call( + self._delete_expired_login_tokens, THIRTY_MINUTES_IN_MS + ) + async def add_access_token_to_user( self, user_id: str, @@ -2617,6 +2754,23 @@ class RegistrationStore(StatsStore, RegistrationBackgroundUpdateStore): approved, ) + @wrap_as_background_process("delete_expired_login_tokens") + async def _delete_expired_login_tokens(self) -> None: + """Remove login tokens with expiry dates that have passed.""" + + def _delete_expired_login_tokens_txn(txn: LoggingTransaction, ts: int) -> None: + sql = "DELETE FROM login_tokens WHERE expiry_ts <= ?" + txn.execute(sql, (ts,)) + + # We keep the expired tokens for an extra 5 minutes so we can measure how many + # times a token is being used after its expiry + now = self._clock.time_msec() + await self.db_pool.runInteraction( + "delete_expired_login_tokens", + _delete_expired_login_tokens_txn, + now - (5 * 60 * 1000), + ) + def find_max_generated_user_id_localpart(cur: Cursor) -> int: """ diff --git a/synapse/storage/schema/main/delta/73/10login_tokens.sql b/synapse/storage/schema/main/delta/73/10login_tokens.sql new file mode 100644 index 0000000000..a39b7bcece --- /dev/null +++ b/synapse/storage/schema/main/delta/73/10login_tokens.sql @@ -0,0 +1,35 @@ +/* + * Copyright 2022 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. + */ + +-- Login tokens are short-lived tokens that are used for the m.login.token +-- login method, mainly during SSO logins +CREATE TABLE login_tokens ( + token TEXT PRIMARY KEY, + user_id TEXT NOT NULL, + expiry_ts BIGINT NOT NULL, + used_ts BIGINT, + auth_provider_id TEXT, + auth_provider_session_id TEXT +); + +-- We're sometimes querying them by their session ID we got from their IDP +CREATE INDEX login_tokens_auth_provider_idx + ON login_tokens (auth_provider_id, auth_provider_session_id); + +-- We're deleting them by their expiration time +CREATE INDEX login_tokens_expiry_time_idx + ON login_tokens (expiry_ts); + diff --git a/synapse/util/macaroons.py b/synapse/util/macaroons.py index df77edcce2..5df03d3ddc 100644 --- a/synapse/util/macaroons.py +++ b/synapse/util/macaroons.py @@ -24,7 +24,7 @@ from typing_extensions import Literal from synapse.util import Clock, stringutils -MacaroonType = Literal["access", "delete_pusher", "session", "login"] +MacaroonType = Literal["access", "delete_pusher", "session"] def get_value_from_macaroon(macaroon: pymacaroons.Macaroon, key: str) -> str: @@ -111,19 +111,6 @@ class OidcSessionData: """The session ID of the ongoing UI Auth ("" if this is a login)""" -@attr.s(slots=True, frozen=True, auto_attribs=True) -class LoginTokenAttributes: - """Data we store in a short-term login token""" - - user_id: str - - auth_provider_id: str - """The SSO Identity Provider that the user authenticated with, to get this token.""" - - auth_provider_session_id: Optional[str] - """The session ID advertised by the SSO Identity Provider.""" - - class MacaroonGenerator: def __init__(self, clock: Clock, location: str, secret_key: bytes): self._clock = clock @@ -165,35 +152,6 @@ class MacaroonGenerator: macaroon.add_first_party_caveat(f"pushkey = {pushkey}") return macaroon.serialize() - def generate_short_term_login_token( - self, - user_id: str, - auth_provider_id: str, - auth_provider_session_id: Optional[str] = None, - duration_in_ms: int = (2 * 60 * 1000), - ) -> str: - """Generate a short-term login token used during SSO logins - - Args: - user_id: The user for which the token is valid. - auth_provider_id: The SSO IdP the user used. - auth_provider_session_id: The session ID got during login from the SSO IdP. - - Returns: - A signed token valid for using as a ``m.login.token`` token. - """ - now = self._clock.time_msec() - expiry = now + duration_in_ms - macaroon = self._generate_base_macaroon("login") - macaroon.add_first_party_caveat(f"user_id = {user_id}") - macaroon.add_first_party_caveat(f"time < {expiry}") - macaroon.add_first_party_caveat(f"auth_provider_id = {auth_provider_id}") - if auth_provider_session_id is not None: - macaroon.add_first_party_caveat( - f"auth_provider_session_id = {auth_provider_session_id}" - ) - return macaroon.serialize() - def generate_oidc_session_token( self, state: str, @@ -233,49 +191,6 @@ class MacaroonGenerator: return macaroon.serialize() - def verify_short_term_login_token(self, token: str) -> LoginTokenAttributes: - """Verify a short-term-login macaroon - - Checks that the given token is a valid, unexpired short-term-login token - minted by this server. - - Args: - token: The login token to verify. - - Returns: - A set of attributes carried by this token, including the - ``user_id`` and informations about the SSO IDP used during that - login. - - Raises: - MacaroonVerificationFailedException if the verification failed - """ - macaroon = pymacaroons.Macaroon.deserialize(token) - - v = self._base_verifier("login") - v.satisfy_general(lambda c: c.startswith("user_id = ")) - v.satisfy_general(lambda c: c.startswith("auth_provider_id = ")) - v.satisfy_general(lambda c: c.startswith("auth_provider_session_id = ")) - satisfy_expiry(v, self._clock.time_msec) - v.verify(macaroon, self._secret_key) - - user_id = get_value_from_macaroon(macaroon, "user_id") - auth_provider_id = get_value_from_macaroon(macaroon, "auth_provider_id") - - auth_provider_session_id: Optional[str] = None - try: - auth_provider_session_id = get_value_from_macaroon( - macaroon, "auth_provider_session_id" - ) - except MacaroonVerificationFailedException: - pass - - return LoginTokenAttributes( - user_id=user_id, - auth_provider_id=auth_provider_id, - auth_provider_session_id=auth_provider_session_id, - ) - def verify_guest_token(self, token: str) -> str: """Verify a guest access token macaroon |