feat: add audit logging to grant_sudo_mode/1

lib/towerops/accounts.ex

@@ -15,6 +15,7 @@ defmodule Towerops.Accounts do
   alias Towerops.Accounts.UserRecoveryCode
   alias Towerops.Accounts.UserToken
   alias Towerops.Accounts.UserTotpDevice
+  alias Towerops.Admin.AuditLogger
   alias Towerops.GeoIP
   alias Towerops.Repo
 
@@ -633,9 +634,19 @@ defmodule Towerops.Accounts do
   def grant_sudo_mode(%User{} = user) do
     now = DateTime.utc_now()
 
-    user
-    |> User.sudo_changeset(%{last_sudo_at: now})
-    |> Repo.update()
+    with {:ok, _updated_user} = result <-
+           user
+           |> User.sudo_changeset(%{last_sudo_at: now})
+           |> Repo.update() do
+      # Log sudo mode grant for security auditing
+      AuditLogger.log_event("sudo_mode_granted", nil,
+        actor_id: user.id,
+        target_user_id: user.id,
+        metadata: %{granted_at: now}
+      )
+
+      result
+    end
   end
 
   @doc """

lib/towerops/admin/audit_log.ex

@@ -61,7 +61,8 @@ defmodule Towerops.Admin.AuditLog do
       "monitoring_data_queried",
       # Security events
       "failed_access_attempt",
-      "privilege_escalation"
+      "privilege_escalation",
+      "sudo_mode_granted"
     ])
   end
 end

test/towerops/accounts/grant_sudo_mode_test.exs

@@ -5,6 +5,7 @@ defmodule Towerops.Accounts.GrantSudoModeTest do
 
   alias Towerops.Accounts
   alias Towerops.Accounts.User
+  alias Towerops.Admin
 
   describe "grant_sudo_mode/1" do
     test "updates user's last_sudo_at timestamp" do
@@ -40,5 +41,30 @@ defmodule Towerops.Accounts.GrantSudoModeTest do
       refute changeset.valid?
       assert "can't be blank" in errors_on(changeset).last_sudo_at
     end
+
+    test "creates audit log entry when sudo mode is granted" do
+      user = user_fixture()
+
+      # Verify no audit logs exist before
+      logs_before = Admin.list_audit_logs_for_user(user.id)
+      assert Enum.empty?(logs_before)
+
+      # Grant sudo mode
+      {:ok, updated_user} = Accounts.grant_sudo_mode(user)
+
+      # Verify audit log was created
+      logs_after = Admin.list_audit_logs_for_user(user.id)
+      assert length(logs_after) == 1
+
+      [log] = logs_after
+      assert log.action == "sudo_mode_granted"
+      assert log.superuser_id == user.id
+      assert log.target_user_id == user.id
+      assert log.metadata["granted_at"]
+
+      # Verify the granted_at timestamp matches the user's last_sudo_at
+      granted_at = log.metadata["granted_at"] |> DateTime.from_iso8601() |> elem(1)
+      assert DateTime.diff(granted_at, updated_user.last_sudo_at, :second) == 0
+    end
   end
 end