⚡️(backend) hash application secrets with SHA-256

Application token authentication currently uses Django's default
password hasher. On our production hardware, token requests take
at least ~500 ms. Authentication happens per user of each
application, so this cost accumulates across frequently used
integrations.

Password hashers deliberately make guessing expensive to protect
human-chosen passwords after a database leak. Our application
secrets are generated server-side using a cryptographically secure
random generator, with a default length of 128 alphanumeric
characters. Guessing these secrets is already computationally
infeasible, making password stretching an unnecessary CPU cost.

Switch to SHA-256 for application secrets while retaining
constant-time comparison, and keep user password hashing
unchanged. Existing secrets migrate after successful verification
without requiring key rotation. Conditional updates prevent
migration from overwriting a concurrent rotation.

This assumes securely generated, high-entropy secrets. Deployments
that reduce `APPLICATION_CLIENT_SECRET_LENGTH` or supply
predictable secrets lose the offline guessing protection that the
previous slow hasher provided.

CHANGELOG.md

@@ -8,10 +8,17 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Changed
+
+- 📈(frontend) include LiveKit SIDs in the connection analytics event
+- 🔇(backend) silence expected 401 warnings on /me
+- 🔇(backend) silence noisy request summary info logs
+
 ### Fixed
 
 - 🐛(backend) acknowledge unknown LiveKit webhook events instead of 422
 - 🔒️(backend) enforce display name setting on rename API
+- 🔒️(backend) reject inactive users in resource server backend
 
 ## [1.31.0] - 2026-09-08
 

src/backend/core/external_api/authentication.py

@@ -286,6 +286,10 @@ class ResourceServerBackend(LaSuiteBackend):
         if user is None and settings.OIDC_CREATE_USER:
             user = self.create_user(sub)
 
+        if user is not None and not user.is_active:
+            logger.warning("Inactive user attempted authentication: %s", user.pk)
+            raise SuspiciousOperation("User account is disabled.")
+
         return user
 
     def create_user(self, sub):

src/backend/core/external_api/viewsets.py

@@ -4,7 +4,6 @@ import copy
 from logging import getLogger
 
 from django.conf import settings
-from django.contrib.auth.hashers import check_password
 from django.core.exceptions import ValidationError
 from django.core.validators import validate_email
 
@@ -74,7 +73,7 @@ class ApplicationViewSet(viewsets.ViewSet):
         except models.Application.DoesNotExist as e:
             raise drf_exceptions.AuthenticationFailed("Invalid credentials") from e
 
-        if not check_password(client_secret, application.client_secret):
+        if not application.check_client_secret(client_secret):
             raise drf_exceptions.AuthenticationFailed("Invalid credentials")
 
         if not application.is_active:

src/backend/core/fields.py

@@ -4,9 +4,11 @@ Core application fields
 
 from logging import getLogger
 
-from django.contrib.auth.hashers import identify_hasher, make_password
+from django.contrib.auth.hashers import identify_hasher
 from django.db import models
 
+from .hashers import hash_client_secret
+
 logger = getLogger(__name__)
 
 
@@ -24,6 +26,14 @@ class SecretField(models.CharField):
 
         secret = getattr(model_instance, self.attname)
 
+        if secret.startswith("sha256$"):
+            logger.debug(
+                "%s: %s is already hashed with sha256.",
+                model_instance,
+                self.attname,
+            )
+            return secret
+
         try:
             hasher = identify_hasher(secret)
             logger.debug(
@@ -36,7 +46,7 @@ class SecretField(models.CharField):
             logger.debug(
                 "%s: %s is not hashed; hashing it now.", model_instance, self.attname
             )
-            hashed_secret = make_password(secret)
+            hashed_secret = hash_client_secret(secret)
             setattr(model_instance, self.attname, hashed_secret)
             return hashed_secret
 

src/backend/core/hashers.py

@@ -0,0 +1,24 @@
+"""Application secrets only: keep fast hashing out of PASSWORD_HASHERS.
+
+Secrets must be securely randomly generated, not human-chosen.
+"""
+
+import hashlib
+
+from django.contrib.auth.hashers import check_password
+from django.utils.crypto import constant_time_compare
+from django.utils.encoding import force_bytes
+
+
+def hash_client_secret(raw_secret):
+    """Hash a machine-generated application secret without key stretching."""
+    return f"sha256${hashlib.sha256(force_bytes(raw_secret)).hexdigest()}"
+
+
+def verify_client_secret(raw_secret, encoded):
+    """Verify the application format or a legacy Django password hash."""
+    if raw_secret is None:
+        return False
+    if encoded.startswith("sha256$"):
+        return constant_time_compare(encoded, hash_client_secret(raw_secret))
+    return check_password(raw_secret, encoded)

src/backend/core/logging_filters.py

@@ -0,0 +1,25 @@
+"""Logging filters for the core application."""
+
+import logging
+
+from django.conf import settings
+
+
+class SilenceExpected401(logging.Filter):
+    """Drop the expected 401 from anonymous hits on the /me endpoint.
+
+    The frontend probes `/users/me/` to check authentication; a 401 for
+    anonymous users is normal, not a warning worth logging.
+    """
+
+    def filter(self, record):
+        """Return False for a 401 on a silenced path, True otherwise."""
+        if getattr(record, "status_code", None) != 401:
+            return True
+
+        request = getattr(record, "request", None)
+        path = getattr(request, "path", None)
+        if not path:
+            return True
+
+        return path not in settings.LOGGING_SILENCED_401_PATHS

src/backend/core/models.py

@@ -25,7 +25,7 @@ from django.utils.translation import gettext_lazy as _
 from lasuite.tools.email import get_domain_from_email
 from timezone_field import TimeZoneField
 
-from . import fields, utils
+from . import fields, hashers, utils
 from .recording.enums import FileExtension
 from .validators import sub_validator
 
@@ -828,6 +828,31 @@ class Application(BaseModel):
     def __str__(self):
         return f"{self.name!s}"
 
+    def check_client_secret(self, raw_secret):
+        """Verify and lazily rehash without overwriting a concurrent rotation."""
+        original_hash = self.client_secret
+        if not hashers.verify_client_secret(raw_secret, original_hash):
+            return False
+
+        if original_hash.startswith("sha256$"):
+            return True
+
+        # Fast hashing assumes securely generated, high-entropy secrets.
+        # APPLICATION_CLIENT_SECRET_LENGTH controls generated length, not randomness.
+        encoded = hashers.hash_client_secret(raw_secret)
+        updated = Application.objects.filter(
+            pk=self.pk, client_secret=original_hash
+        ).update(client_secret=encoded)
+        if updated:
+            self.client_secret = encoded
+            return True
+
+        try:
+            self.refresh_from_db()
+        except type(self).DoesNotExist:
+            return False
+        return hashers.verify_client_secret(raw_secret, self.client_secret)
+
     def can_delegate_email(self, email):
         """Check if this application can delegate the given email."""
 

src/backend/core/tests/test_application_secret_hashers.py

@@ -0,0 +1,146 @@
+"""Application hashing and migration of existing credentials."""
+
+import hashlib
+from unittest import mock
+
+from django.contrib.auth.hashers import check_password, identify_hasher, make_password
+from django.db import connection
+from django.test.utils import CaptureQueriesContext
+from django.utils.crypto import get_random_string
+
+import pytest
+from rest_framework.test import APIClient
+
+from core import hashers
+from core.factories import ApplicationFactory, UserFactory
+from core.models import Application
+
+pytestmark = pytest.mark.django_db
+
+
+@pytest.mark.parametrize("secret", ["short", "a" * 128, b"byte-secret"])
+def test_application_hash(secret):
+    """Application hashes verify correctly but are not accepted for user passwords."""
+    encoded = hashers.hash_client_secret(secret)
+    raw = secret.encode() if isinstance(secret, str) else secret
+    assert encoded == f"sha256${hashlib.sha256(raw).hexdigest()}"
+    assert hashers.verify_client_secret(secret, encoded)
+    assert not hashers.verify_client_secret("wrong", encoded)
+    assert not hashers.verify_client_secret(None, encoded)
+    assert not hashers.verify_client_secret(secret, "sha256$invalid")
+    assert not check_password(secret, encoded)
+    with pytest.raises(ValueError):
+        identify_hasher(encoded)
+    assert not make_password(raw.decode()).startswith("sha256$")
+
+
+@pytest.mark.parametrize("algorithm", ["pbkdf2_sha256", "md5"])
+def test_token_migrates_legacy_secret_once(algorithm):
+    """The same client secret works before and after migration, with no later writes."""
+    secret = get_random_string(128)
+    user = UserFactory()
+    legacy = make_password(secret, hasher=algorithm)
+    app = ApplicationFactory(client_secret=legacy)
+    app.refresh_from_db()
+
+    assert app.client_secret == legacy
+    payload = {
+        "client_id": app.client_id,
+        "client_secret": secret,
+        "grant_type": "client_credentials",
+        "scope": user.email,
+    }
+    client = APIClient()
+    response = client.post(
+        "/external-api/v1.0/application/token/", payload, format="json"
+    )
+    assert response.status_code == 200
+    app.refresh_from_db()
+    migrated = app.client_secret
+    assert migrated == hashers.hash_client_secret(secret)
+    with CaptureQueriesContext(connection) as queries:
+        response = client.post(
+            "/external-api/v1.0/application/token/", payload, format="json"
+        )
+    assert response.status_code == 200
+    assert not any(q["sql"].lstrip().startswith("UPDATE") for q in queries)
+    app.refresh_from_db()
+    assert app.client_secret == migrated
+
+
+def test_wrong_secret_does_not_migrate():
+    """Failed authentication leaves a production PBKDF2 hash untouched."""
+    user = UserFactory()
+    legacy = make_password(get_random_string(128), hasher="pbkdf2_sha256")
+    app = ApplicationFactory(client_secret=legacy)
+    response = APIClient().post(
+        "/external-api/v1.0/application/token/",
+        {
+            "client_id": app.client_id,
+            "client_secret": "wrong",
+            "grant_type": "client_credentials",
+            "scope": user.email,
+        },
+        format="json",
+    )
+    assert response.status_code == 401
+    app.refresh_from_db()
+    assert app.client_secret == legacy
+
+
+def test_migration_preserves_concurrent_rotation():
+    """Migration must not restore a secret rotated after verification."""
+    secret = get_random_string(128)
+    app = ApplicationFactory(
+        client_secret=make_password(secret, hasher="pbkdf2_sha256")
+    )
+    replacement = hashers.hash_client_secret(get_random_string(128))
+
+    def verify_then_rotate(raw, encoded):
+        verified = check_password(raw, encoded)
+        Application.objects.filter(pk=app.pk).update(client_secret=replacement)
+        return verified
+
+    with mock.patch.object(hashers, "check_password", side_effect=verify_then_rotate):
+        assert app.check_client_secret(secret) is False
+
+    app.refresh_from_db()
+    assert app.client_secret == replacement
+
+
+def test_migration_preserves_concurrent_migration():
+    """Authentication succeeds when another request migrates the same secret."""
+    secret = get_random_string(128)
+    app = ApplicationFactory(
+        client_secret=make_password(secret, hasher="pbkdf2_sha256")
+    )
+    migrated = hashers.hash_client_secret(secret)
+
+    def verify_then_migrate(raw, encoded):
+        verified = check_password(raw, encoded)
+        Application.objects.filter(pk=app.pk).update(client_secret=migrated)
+        return verified
+
+    with mock.patch.object(hashers, "check_password", side_effect=verify_then_migrate):
+        assert app.check_client_secret(secret) is True
+
+    app.refresh_from_db()
+    assert app.client_secret == migrated
+
+
+def test_migration_preserves_concurrent_deletion():
+    """Authentication fails when the application is deleted after verification."""
+    secret = get_random_string(128)
+    app = ApplicationFactory(
+        client_secret=make_password(secret, hasher="pbkdf2_sha256")
+    )
+
+    def verify_then_delete(raw, encoded):
+        verified = check_password(raw, encoded)
+        Application.objects.filter(pk=app.pk).delete()
+        return verified
+
+    with mock.patch.object(hashers, "check_password", side_effect=verify_then_delete):
+        assert app.check_client_secret(secret) is False
+
+    assert not Application.objects.filter(pk=app.pk).exists()

src/backend/core/tests/test_external_api_authentication.py

@@ -0,0 +1,96 @@
+"""Tests for the external API ResourceServerBackend."""
+
+from django.core.exceptions import SuspiciousOperation
+
+import pytest
+import responses
+from rest_framework.test import APIClient
+
+from core.external_api.authentication import ResourceServerBackend
+from core.factories import UserFactory
+from core.models import User
+
+pytestmark = pytest.mark.django_db
+
+
+def _payload(sub):
+    return {"sub": sub, "active": True, "scope": "lasuite_meet", "client_id": "app"}
+
+
+def test_resource_server_backend_get_or_create_user_active():
+    """An existing active user matching the sub should be returned."""
+
+    user = UserFactory()
+
+    result = ResourceServerBackend().get_or_create_user(
+        access_token="token", id_token=None, payload=_payload(user.sub)
+    )
+
+    assert result == user
+
+
+def test_resource_server_backend_get_or_create_user_inactive():
+    """An inactive user should be rejected even with a valid token."""
+
+    user = UserFactory(is_active=False)
+
+    with pytest.raises(SuspiciousOperation, match="User account is disabled."):
+        ResourceServerBackend().get_or_create_user(
+            access_token="token", id_token=None, payload=_payload(user.sub)
+        )
+
+
+def test_resource_server_backend_get_or_create_user_creates(settings):
+    """An unknown sub should create an active user when OIDC_CREATE_USER is set."""
+
+    settings.OIDC_CREATE_USER = True
+
+    result = ResourceServerBackend().get_or_create_user(
+        access_token="token", id_token=None, payload=_payload("new-sub")
+    )
+
+    assert result.sub == "new-sub"
+    assert result.is_active is True
+    assert User.objects.filter(sub="new-sub").exists()
+
+
+def test_resource_server_backend_get_or_create_user_no_creation(settings):
+    """An unknown sub should return None when OIDC_CREATE_USER is unset."""
+
+    settings.OIDC_CREATE_USER = False
+
+    result = ResourceServerBackend().get_or_create_user(
+        access_token="token", id_token=None, payload=_payload("new-sub")
+    )
+
+    assert result is None
+    assert not User.objects.filter(sub="new-sub").exists()
+
+
+@responses.activate
+def test_api_rooms_list_resource_server_inactive_user(settings):
+    """End to end: a valid introspected token for an inactive user should get 401."""
+
+    settings.OIDC_OP_INTROSPECTION_ENDPOINT = "https://oidc.example.com/introspect"
+    settings.OIDC_OP_URL = "https://oidc.example.com"
+
+    user = UserFactory(is_active=False)
+
+    responses.add(
+        responses.POST,
+        "https://oidc.example.com/introspect",
+        json={
+            "iss": "https://oidc.example.com",
+            "active": True,
+            "sub": user.sub,
+            "scope": "openid lasuite_meet rooms:list",
+            "client_id": "app",
+        },
+    )
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION="Bearer rs-token")
+    response = client.get("/external-api/v1.0/rooms/")
+
+    assert response.status_code == 401
+    assert "login failed" in str(response.data).lower()

src/backend/core/tests/test_models_applications.py

@@ -6,12 +6,12 @@ Unit tests for the Application and ApplicationDomain models
 
 from unittest import mock
 
-from django.contrib.auth.hashers import check_password
 from django.core.exceptions import ValidationError
 
 import pytest
 
 from core.factories import ApplicationDomainFactory, ApplicationFactory
+from core.hashers import verify_client_secret
 from core.models import Application, ApplicationDomain, ApplicationScope
 
 pytestmark = pytest.mark.django_db
@@ -98,8 +98,8 @@ def test_models_application_client_secret_hashed_on_save():
 
     # Secret should be hashed, not plain
     assert application.client_secret != plain_secret
-    # Should verify with check_password
-    assert check_password(plain_secret, application.client_secret) is True
+    # Should verify with the application credential policy
+    assert verify_client_secret(plain_secret, application.client_secret) is True
 
 
 def test_models_application_client_secret_preserves_existing_hash():

src/backend/meet/settings.py

@@ -469,6 +469,9 @@ class Base(Configuration):
 
     # Sentry
     SENTRY_DSN = values.Value(None, environ_name="SENTRY_DSN")
+    SENTRY_TRACES_SAMPLE_RATE = values.FloatValue(
+        0.0, environ_name="SENTRY_TRACES_SAMPLE_RATE", environ_prefix=None
+    )
 
     # Easy thumbnails
     THUMBNAIL_EXTENSION = "webp"
@@ -1110,6 +1113,12 @@ class Base(Configuration):
         environ_prefix=None,
     )
 
+    LOGGING_SILENCED_401_PATHS = values.ListValue(
+        default=["/api/v1.0/users/me/"],
+        environ_name="LOGGING_SILENCED_401_PATHS",
+        environ_prefix=None,
+    )
+
     # Logging
     # We want to make it easy to log to console but by default we log production
     # to Sentry and don't want to log to console.
@@ -1122,10 +1131,16 @@ class Base(Configuration):
                 "style": "{",
             },
         },
+        "filters": {
+            "silence_expected_401": {
+                "()": "core.logging_filters.SilenceExpected401",
+            },
+        },
         "handlers": {
             "console": {
                 "class": "logging.StreamHandler",
                 "formatter": "simple",
+                "filters": ["silence_expected_401"],
             },
         },
         # Override root logger to send it to console
@@ -1136,6 +1151,13 @@ class Base(Configuration):
             ),
         },
         "loggers": {
+            "request.summary": {
+                "level": values.Value(
+                    "WARNING",
+                    environ_name="LOGGING_LEVEL_REQUEST_SUMMARY",
+                    environ_prefix="",
+                )
+            },
             "core": {
                 "handlers": ["console"],
                 "level": values.Value(
@@ -1211,7 +1233,14 @@ class Base(Configuration):
                 dsn=cls.SENTRY_DSN,
                 environment=cls.__name__.lower(),  # build, test, development, production
                 release=get_release(),
-                integrations=[DjangoIntegration()],
+                traces_sample_rate=cls.SENTRY_TRACES_SAMPLE_RATE,
+                integrations=[
+                    DjangoIntegration(
+                        transaction_style="url",
+                        middleware_spans=True,
+                        cache_spans=True,
+                    )
+                ],
             )
             sentry_sdk.set_tag("application", "backend")
 
@@ -1283,6 +1312,7 @@ class Test(Base):
     )
     PASSWORD_HASHERS = [
         "django.contrib.auth.hashers.MD5PasswordHasher",
+        "django.contrib.auth.hashers.PBKDF2PasswordHasher",
     ]
     USE_SWAGGER = True
     EXTERNAL_API_ENABLED = True

src/frontend/src/features/rooms/livekit/components/ConnectionObserver.tsx

@@ -71,20 +71,30 @@ export const ConnectionObserver = () => {
   useEffect(() => {
     if (!isAnalyticsEnabled) return
 
-    const handleConnection = () => {
+    const handleConnection = async () => {
       // Preserve original connection timestamp across reconnections to measure
       // total session duration from first connect to final disconnect.
       if (connectionStartTimeRef.current != null) return
       connectionStartTimeRef.current = Date.now()
-      void captureMediaEvent('connection-event', {})
+      const participantSid = room.localParticipant.sid
+      const roomSid = await room.getSid().catch(() => undefined)
+      void captureMediaEvent('connection-event', {
+        livekit_room_sid: roomSid,
+        livekit_participant_sid: participantSid,
+      })
     }
 
     const handleReconnect = () => {
       captureEvent('reconnect-event')
     }
 
-    const handleReconnected = () => {
-      captureEvent('reconnected-event')
+    const handleReconnected = async () => {
+      const participantSid = room.localParticipant.sid
+      const roomSid = await room.getSid().catch(() => undefined)
+      captureEvent('reconnected-event', {
+        livekit_room_sid: roomSid,
+        livekit_participant_sid: participantSid,
+      })
     }
 
     const handleSignalingConnect = () => {

src/frontend/src/locales/de/rooms.json

@@ -480,7 +480,7 @@
       "destination": "Ein neues Dokument wird erstellt auf",
       "destinationUnknown": "Ein neues Dokument wird erstellt",
       "language": "Meeting-Sprache:",
-      "recording": "Auch eine Aufzeichnung starten"
+      "recording": "Auch eine Videoaufzeichnung starten"
     },
     "button": {
       "start": "Meeting-Transkription starten",

src/frontend/src/locales/en/rooms.json

@@ -480,7 +480,7 @@
       "destination": "A new document will be created on",
       "destinationUnknown": "A new document will be created",
       "language": "Meeting language:",
-      "recording": "Also start a recording"
+      "recording": "Also start a video recording"
     },
     "button": {
       "start": "Start transcribing the meeting",

src/frontend/src/locales/es/rooms.json

@@ -479,7 +479,7 @@
       "destination": "Se creará un nuevo documento en",
       "destinationUnknown": "Se creará un nuevo documento",
       "language": "Idioma de la reunión:",
-      "recording": "Iniciar también una grabación"
+      "recording": "Iniciar también una grabación de vídeo"
     },
     "button": {
       "start": "Empezar a transcribir la reunión",

src/frontend/src/locales/fr/rooms.json

@@ -480,7 +480,7 @@
       "destination": "Un nouveau document sera créé sur",
       "destinationUnknown": "Un nouveau document sera créé",
       "language": "Langue de la réunion :",
-      "recording": "Démarrer aussi un enregistrement"
+      "recording": "Démarrer aussi un enregistrement vidéo"
     },
     "button": {
       "start": "Commencer à transcrire la réunion",

src/frontend/src/locales/nl/rooms.json

@@ -480,7 +480,7 @@
       "destination": "Er wordt een nieuw document aangemaakt op",
       "destinationUnknown": "Een nieuw document wordt aangemaakt",
       "language": "Vergadertalen:",
-      "recording": "Start ook een opname"
+      "recording": "Start ook een video-opname"
     },
     "button": {
       "start": "Begin met het transcriberen van de vergadering",