Phase 1: Critical security fixes - 59 permissions, grants, RLS, mass-assignment, ownership, leaks, MIME

app/core/permission_registry.py

@@ -66,6 +66,66 @@ CORE_PERMISSIONS: list[dict[str, str]] = [
     {"key": "workspaces:assign_users", "label": "Workspaces: Assign Users", "category": "core", "module": "workspaces"},
     {"key": "workspaces:configure_modules", "label": "Workspaces: Configure Modules", "category": "core", "module": "workspaces"},
     {"key": "system:admin", "label": "System: Admin (cross-tenant)", "category": "system", "module": "system"},
+    # ── Plugin permissions (registered at startup, but also listed here for completeness) ──
+    {"key": "ai:read", "label": "AI: Read", "category": "core", "module": "ai"},
+    {"key": "ai:write", "label": "AI: Write", "category": "core", "module": "ai"},
+    {"key": "ai:agents", "label": "AI: Agents", "category": "core", "module": "ai"},
+    {"key": "ai:config", "label": "AI: Config", "category": "core", "module": "ai"},
+    {"key": "ai_proactive:read", "label": "AI Proactive: Read", "category": "core", "module": "ai_proactive"},
+    {"key": "ai_proactive:write", "label": "AI Proactive: Write", "category": "core", "module": "ai_proactive"},
+    {"key": "ai_proactive:config", "label": "AI Proactive: Config", "category": "core", "module": "ai_proactive"},
+    {"key": "agents:read", "label": "Agents: Read", "category": "core", "module": "agents"},
+    {"key": "agents:write", "label": "Agents: Write", "category": "core", "module": "agents"},
+    {"key": "agents:delete", "label": "Agents: Delete", "category": "core", "module": "agents"},
+    {"key": "agents:execute", "label": "Agents: Execute", "category": "core", "module": "agents"},
+    {"key": "automation:read", "label": "Automation: Read", "category": "core", "module": "automation"},
+    {"key": "automation:write", "label": "Automation: Write", "category": "core", "module": "automation"},
+    {"key": "automation:delete", "label": "Automation: Delete", "category": "core", "module": "automation"},
+    {"key": "automation:execute", "label": "Automation: Execute", "category": "core", "module": "automation"},
+    {"key": "automation:admin", "label": "Automation: Admin", "category": "core", "module": "automation"},
+    {"key": "automation:configure", "label": "Automation: Configure", "category": "core", "module": "automation"},
+    {"key": "calendar:read", "label": "Calendar: Read", "category": "core", "module": "calendar"},
+    {"key": "calendar:write", "label": "Calendar: Write", "category": "core", "module": "calendar"},
+    {"key": "calendar:delete", "label": "Calendar: Delete", "category": "core", "module": "calendar"},
+    {"key": "calendar:share", "label": "Calendar: Share", "category": "core", "module": "calendar"},
+    {"key": "comm:read", "label": "Comm: Read", "category": "core", "module": "comm"},
+    {"key": "comm:write", "label": "Comm: Write", "category": "core", "module": "comm"},
+    {"key": "comm:delete", "label": "Comm: Delete", "category": "core", "module": "comm"},
+    {"key": "comm:manage", "label": "Comm: Manage", "category": "core", "module": "comm"},
+    {"key": "dashboard:read", "label": "Dashboard: Read", "category": "core", "module": "dashboard"},
+    {"key": "dms:read", "label": "DMS: Read", "category": "core", "module": "dms"},
+    {"key": "dms:write", "label": "DMS: Write", "category": "core", "module": "dms"},
+    {"key": "dms:delete", "label": "DMS: Delete", "category": "core", "module": "dms"},
+    {"key": "dms:share", "label": "DMS: Share", "category": "core", "module": "dms"},
+    {"key": "entity_links:read", "label": "Entity Links: Read", "category": "core", "module": "entity_links"},
+    {"key": "entity_links:write", "label": "Entity Links: Write", "category": "core", "module": "entity_links"},
+    {"key": "entity_links:delete", "label": "Entity Links: Delete", "category": "core", "module": "entity_links"},
+    {"key": "mail:read", "label": "Mail: Read", "category": "core", "module": "mail"},
+    {"key": "mail:write", "label": "Mail: Write", "category": "core", "module": "mail"},
+    {"key": "mail:delete", "label": "Mail: Delete", "category": "core", "module": "mail"},
+    {"key": "mail:send", "label": "Mail: Send", "category": "core", "module": "mail"},
+    {"key": "mail:share", "label": "Mail: Share", "category": "core", "module": "mail"},
+    {"key": "mail:config", "label": "Mail: Config", "category": "core", "module": "mail"},
+    {"key": "mcp:read", "label": "MCP: Read", "category": "core", "module": "mcp"},
+    {"key": "mcp:write", "label": "MCP: Write", "category": "core", "module": "mcp"},
+    {"key": "permissions:admin", "label": "Permissions: Admin", "category": "core", "module": "permissions"},
+    {"key": "permissions:delegations:read", "label": "Permissions: Delegations: Read", "category": "core", "module": "permissions"},
+    {"key": "permissions:delegations:write", "label": "Permissions: Delegations: Write", "category": "core", "module": "permissions"},
+    {"key": "permissions:policies:read", "label": "Permissions: Policies: Read", "category": "core", "module": "permissions"},
+    {"key": "permissions:policies:write", "label": "Permissions: Policies: Write", "category": "core", "module": "permissions"},
+    {"key": "permissions:templates:read", "label": "Permissions: Templates: Read", "category": "core", "module": "permissions"},
+    {"key": "permissions:templates:write", "label": "Permissions: Templates: Write", "category": "core", "module": "permissions"},
+    {"key": "reports:read", "label": "Reports: Read", "category": "core", "module": "reports"},
+    {"key": "reports:generate", "label": "Reports: Generate", "category": "core", "module": "reports"},
+    {"key": "reports:manage_templates", "label": "Reports: Manage Templates", "category": "core", "module": "reports"},
+    {"key": "search:read", "label": "Search: Read", "category": "core", "module": "search"},
+    {"key": "search:admin", "label": "Search: Admin", "category": "core", "module": "search"},
+    {"key": "tags:read", "label": "Tags: Read", "category": "core", "module": "tags"},
+    {"key": "tags:write", "label": "Tags: Write", "category": "core", "module": "tags"},
+    {"key": "tags:delete", "label": "Tags: Delete", "category": "core", "module": "tags"},
+    {"key": "tasks:read", "label": "Tasks: Read", "category": "core", "module": "tasks"},
+    {"key": "tasks:write", "label": "Tasks: Write", "category": "core", "module": "tasks"},
+    {"key": "tasks:delete", "label": "Tasks: Delete", "category": "core", "module": "tasks"},
 ]
 
 

app/plugins/builtins/dms/routes.py

@@ -97,6 +97,40 @@ def _sanitize_filename(filename: str) -> str:
 BLOCKED_EXTENSIONS = {
     ".exe", ".bat", ".cmd", ".sh", ".jar", ".com", ".scr", ".msi",
     ".dll", ".vbs", ".ps1", ".app", ".bin", ".reg", ".inf",
+    ".php", ".py", ".pl", ".asp", ".aspx", ".jsp", ".svg", ".htaccess",
+    ".phtml", ".pht", ".cgi", ".cfm", ".erb",
+}
+
+# Allowed MIME types for upload validation
+ALLOWED_MIME_PREFIXES = {
+    "application/pdf",
+    "application/msword",
+    "application/vnd.openxmlformats-officedocument",
+    "application/vnd.oasis.opendocument",
+    "application/vnd.ms-excel",
+    "application/vnd.ms-powerpoint",
+    "application/zip",
+    "application/gzip",
+    "application/x-tar",
+    "application/json",
+    "application/xml",
+    "application/rtf",
+    "application/x-7z-compressed",
+    "application/x-rar-compressed",
+    "text/plain",
+    "text/csv",
+    "text/html",
+    "text/markdown",
+    "image/png",
+    "image/jpeg",
+    "image/gif",
+    "image/webp",
+    "image/bmp",
+    "image/tiff",
+    "image/x-icon",
+    "audio/",
+    "video/",
+    "application/octet-stream",
 }
 
 
@@ -467,6 +501,14 @@ async def upload_file(
             detail={"detail": "File type not allowed", "code": "blocked_filetype"},
         )
 
+    # MIME type validation: verify content_type against allowlist
+    mime_type = file.content_type or "application/octet-stream"
+    if not any(mime_type.startswith(prefix) for prefix in ALLOWED_MIME_PREFIXES):
+        raise HTTPException(
+            400,
+            detail={"detail": f"MIME type '{mime_type}' not allowed", "code": "blocked_mimetype"},
+        )
+
     # Validate folder exists if specified
     if fid is not None:
         folder_result = await db.execute(

app/routes/entity_permissions.py

@@ -86,6 +86,60 @@ async def create_entity_permission(
         raise HTTPException(status_code=400, detail=str(e))
 
 
+async def _check_entity_ownership(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    user_id: uuid.UUID,
+    entity_type: str,
+    entity_id: str,
+    is_system_admin: bool,
+) -> None:
+    """Verify that the current user owns the entity or is system admin.
+
+    Raises 403 if the user is neither owner nor system admin.
+    """
+    if is_system_admin:
+        return
+
+    from app.models.entity_permission import ENTITY_MODELS
+    from sqlalchemy import select
+
+    model_info = ENTITY_MODELS.get(entity_type)
+    if model_info is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail={"detail": f"Unknown entity type: {entity_type}", "code": "not_found"},
+        )
+
+    model = model_info["model"]
+    try:
+        eid = uuid.UUID(entity_id)
+    except ValueError:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail={"detail": "Invalid entity_id", "code": "invalid_id"},
+        ) from None
+
+    result = await db.execute(
+        select(model.owner_id).where(
+            model.id == eid,
+            model.tenant_id == tenant_id,
+        )
+    )
+    row = result.first()
+    if row is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail={"detail": "Entity not found", "code": "not_found"},
+        )
+    owner_id = row[0]
+    if owner_id is not None and owner_id != user_id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail={"detail": "Only the entity owner or system admin can modify permissions", "code": "forbidden"},
+        )
+
+
 @router.put("/{entity_type}/{entity_id}/{permission_id}")
 async def update_entity_permission(
     entity_type: str,
@@ -103,6 +157,11 @@ async def update_entity_permission(
         _PERM_RATE_LIMIT_MAX,
         _PERM_RATE_LIMIT_WINDOW,
     )
+    # Ownership check: only owner or system admin can update permissions
+    await _check_entity_ownership(
+        db, tenant_id, user_id, entity_type, entity_id,
+        current_user.get("is_system_admin", False),
+    )
     try:
         return await entity_permission_service.update_permission(
             db,

app/routes/system_settings.py

@@ -20,11 +20,24 @@ async def get_system_settings(
     db: AsyncSession = Depends(get_db),
     current_user: dict = Depends(require_permission("settings:read")),
 ):
-    """Get system settings for the current tenant."""
+    """Get system settings for the current tenant.
+
+    Sensitive fields (tax_number, iban, bic) are masked for non-admin users.
+    """
     tenant_id = uuid.UUID(current_user["tenant_id"])
     result = await system_settings_service.get_system_settings(db, tenant_id)
     if result is None:
         return SystemSettingsResponse()
+
+    # Mask sensitive fields for non-admin users
+    if not current_user.get("is_system_admin"):
+        if hasattr(result, "tax_number") and result.tax_number:
+            result.tax_number = "********"
+        if hasattr(result, "iban") and result.iban:
+            result.iban = "********"
+        if hasattr(result, "bic") and result.bic:
+            result.bic = "********"
+
     return result
 
 

app/routes/users.py

@@ -63,6 +63,14 @@ async def create_user(
     user_id = uuid.UUID(current_user["user_id"])
     role_id = _parse_role_id(body.role_id)
 
+    # Mass-Assignment protection: only system admin can create admin users
+    role = body.role
+    if role == "admin" and not current_user.get("is_system_admin"):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail={"detail": "Only system admin can create admin users", "code": "role_escalation_forbidden"},
+        )
+
     try:
         user = await user_service.create_user(
             db,
@@ -70,7 +78,7 @@ async def create_user(
             body.email,
             body.name,
             body.password,
-            body.role,
+            role,
             role_id,
             body.is_active,
         )
@@ -190,6 +198,13 @@ async def update_user(
                 detail={"detail": "Cannot modify your own role or active status", "code": "self_modification_forbidden"},
             )
 
+    # Mass-Assignment protection: only system admin can change roles to admin
+    if body.role == "admin" and not current_user.get("is_system_admin"):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail={"detail": "Only system admin can assign admin role", "code": "role_escalation_forbidden"},
+        )
+
     # Determine if role_id was explicitly sent (Pydantic v2)
     role_id_sent = "role_id" in body.model_fields_set
 

app/schemas/attachment.py

@@ -10,7 +10,6 @@ class AttachmentResponse(BaseModel):
     entity_type: str
     entity_id: str
     filename: str
-    file_path: str
     mime_type: str
     file_size: int
     uploaded_by: str | None = None

app/schemas/system_settings.py

@@ -41,6 +41,11 @@ class SystemSettingsResponse(BaseModel):
     company_legal_form: str | None = None
     company_street: str = ""
     company_city: str = ""
+    # Sensitive fields — masked in API response, only visible to system admin
+    tax_number: str | None = None
+    vat_id: str | None = None
+    iban: str | None = None
+    bic: str | None = None
     company_zip: str = ""
     company_country: str = ""
     tax_number: str | None = None