fix: WeasyPrint URL fetcher + attachment improvements + webhook error propagation + WebSocket conversation check + RLS disabled on system tables (bootstrap fix)

alembic/versions/0067_disable_rls_system_tables.py

@@ -0,0 +1,56 @@
+"""Disable RLS on system identity tables to fix login bootstrap circle.
+
+Revision ID: 0067
+Revises: 0066
+Create Date: 2026-07-29
+
+Problem: users, user_tenants, groups, roles have RLS enabled. The login
+process needs to query these tables BEFORE a tenant context is set
+(bootstrap circle: Login → Membership → Tenant-Context → Login).
+
+RLS on these tables blocks login because there's no tenant context yet.
+
+Solution: Disable RLS on system identity tables. Tenant isolation for
+these tables is enforced at the application level (auth_service always
+filters by user_id + tenant_id in queries).
+"""
+
+from alembic import op
+
+revision = "0067"
+down_revision = "0066"
+branch_labels = None
+depends_on = None
+
+# System identity tables — no RLS (needed for login bootstrap)
+SYSTEM_TABLES = [
+    "users",
+    "user_tenants",
+    "groups",
+    "user_groups",
+    "roles",
+]
+
+
+def upgrade() -> None:
+    for table in SYSTEM_TABLES:
+        # Drop any existing policies
+        op.execute(f"""
+            DO $$
+            DECLARE pol RECORD;
+            BEGIN
+                FOR pol IN
+                    SELECT polname FROM pg_policy
+                    WHERE polrelid = '{table}'::regclass
+                LOOP
+                    EXECUTE format('DROP POLICY IF EXISTS %I ON {table}', pol.polname);
+                END LOOP;
+            END $$;
+        """)
+        # Disable RLS
+        op.execute(f"ALTER TABLE {table} DISABLE ROW LEVEL SECURITY")
+
+
+def downgrade() -> None:
+    for table in SYSTEM_TABLES:
+        op.execute(f"ALTER TABLE {table} ENABLE ROW LEVEL SECURITY")

app/core/webhook_dispatcher.py

@@ -68,7 +68,11 @@ async def _dispatch_single(
     event_name: str,
     data: dict[str, Any],
 ) -> None:
-    """Send a webhook and log the result."""
+    """Send a webhook and log the result. Raises on failure (P1.5 fix).
+
+    Previously errors were swallowed, causing the outbox to mark events
+    as 'published' even when webhook delivery failed.
+    """
     try:
         result = await send_webhook(webhook, event_name, data)
         if result["success"]:
@@ -81,10 +85,12 @@ async def _dispatch_single(
                 f"Webhook {webhook.id} failed for {webhook.url} "
                 f"event {event_name}: {result.get('error')}"
             )
+            raise RuntimeError(f"Webhook {webhook.id} failed: {result.get('error')}")
     except Exception as exc:
         logger.error(
             f"Webhook {webhook.id} dispatch error for {webhook.url}: {exc}"
         )
+        raise  # Re-raise so outbox can retry (P1.5 fix)
 
 
 def register_webhook_event_handlers(event_bus: EventBus | None = None) -> None:

app/plugins/builtins/kommunikation/routes.py

@@ -515,7 +515,23 @@ async def websocket_endpoint(
             elif msg_type == "subscribe":
                 conv_id = msg.get("conversation_id")
                 if conv_id:
-                    ws_manager.subscribe(conv_id, user_id)
+                    # P1.9 fix: Check if user is a participant of this conversation
+                    from app.core.db import async_session_maker
+                    from sqlalchemy import text as sql_text
+                    try:
+                        async with async_session_maker() as db:
+                            await db.execute(sql_text("SELECT set_config('app.current_tenant_id', :tid, true)"), {"tid": tenant_id})
+                            result = await db.execute(
+                                sql_text("SELECT 1 FROM conversation_participants WHERE conversation_id = :cid AND user_id = :uid"),
+                                {"cid": conv_id, "uid": user_id},
+                            )
+                            if result.first():
+                                ws_manager.subscribe(conv_id, user_id)
+                            else:
+                                await ws_manager.send_to_user(user_id, {"type": "error", "message": "Not a participant of this conversation"})
+                    except Exception:
+                        logger.warning("Failed to check conversation participation for %s in %s", user_id, conv_id)
+                        await ws_manager.send_to_user(user_id, {"type": "error", "message": "Cannot verify participation"})
             elif msg_type == "unsubscribe":
                 conv_id = msg.get("conversation_id")
                 if conv_id:

app/plugins/builtins/report_generator/pdf_generator.py

@@ -130,9 +130,23 @@ def render_template_string(template_content: str, data: dict[str, Any]) -> str:
     return template.render(**data)
 
 
+def _safe_url_fetcher(url: str, timeout: int = 10) -> dict:
+    """URL fetcher that only allows data: URIs and blocks external resources.
+
+    Prevents SSRF and local file access via WeasyPrint.
+    """
+    if url.startswith('data:'):
+        from weasyprint import default_url_fetcher
+        return default_url_fetcher(url, timeout)
+    # Block all external URLs (http, https, file, etc.)
+    raise ValueError(f"External resource blocked by URL fetcher: {url}")
+
+
 def generate_pdf(html_content: str) -> bytes:
     """Generate a PDF from HTML content using WeasyPrint.
 
+    Uses a safe URL fetcher that blocks external resources (SSRF protection).
+
     Args:
         html_content: Valid HTML string
 
@@ -141,7 +155,7 @@ def generate_pdf(html_content: str) -> bytes:
     """
     from weasyprint import HTML
 
-    pdf = HTML(string=html_content).write_pdf()
+    pdf = HTML(string=html_content, url_fetcher=_safe_url_fetcher).write_pdf()
     return pdf
 
 

app/routes/attachments.py

@@ -94,13 +94,19 @@ async def download_attachment(
         raise HTTPException(404, detail={"detail": "Attachment not found", "code": "not_found"})
 
     file_path = data["file_path"]
-    if not os.path.isfile(file_path):
+    # Use storage backend instead of os.path.isfile (P1.1 fix)
-        raise HTTPException(404, detail={"detail": "File not found on disk", "code": "file_missing"})
+    from app.core.storage import get_storage_backend
+    storage = get_storage_backend()
+    try:
+        file_bytes = await storage.load(file_path)
+    except Exception:
+        raise HTTPException(404, detail={"detail": "File not found in storage", "code": "file_missing"})
 
-    return FileResponse(
+    from fastapi.responses import Response
-        path=file_path,
+    return Response(
-        filename=data["filename"],
+        content=file_bytes,
         media_type=data["mime_type"],
+        headers={"Content-Disposition": f'attachment; filename="{data["filename"]}"'},
     )
 
 

app/services/attachment_service.py

@@ -50,6 +50,11 @@ async def save_attachment(
     is_system_admin: bool = False,
 ) -> dict[str, Any]:
     """Save a file to storage and create an Attachment record."""
+    # File size limit: 50MB
+    MAX_FILE_SIZE = 50 * 1024 * 1024  # 50 MB
+    if len(file_content) > MAX_FILE_SIZE:
+        raise ValueError(f"File too large: {len(file_content)} bytes (max {MAX_FILE_SIZE})")
+
     # Check access on parent entity
     if not is_system_admin:
         from app.core.visibility import check_single_entity_access
@@ -151,7 +156,7 @@ async def delete_attachment(
     attachment_id: uuid.UUID,
     is_system_admin: bool = False,
 ) -> bool:
-    """Soft-delete an attachment (keeps file on disk for audit trail)."""
+    """Soft-delete an attachment and remove physical file from storage."""
     q = select(Attachment).where(
         Attachment.id == attachment_id,
         Attachment.tenant_id == tenant_id,
@@ -169,6 +174,13 @@ async def delete_attachment(
         if not has_access:
             raise PermissionError("No access")
 
+    # Delete physical file from storage (P1.1 fix)
+    try:
+        storage = get_storage_backend()
+        await storage.delete(attachment.file_path)
+    except Exception as exc:
+        logger.warning("Failed to delete physical file %s: %s", attachment.file_path, exc)
+
     attachment.deleted_at = datetime.now(UTC)
     await db.flush()
     await log_audit(