From 4570164f0c90603bd07eb9e7c07e17bbafb5b5da Mon Sep 17 00:00:00 2001
From: Craig Andrews <candrews@integralblue.com>
Date: Wed, 13 Sep 2017 15:23:09 +0200
Subject: [PATCH 2/4] systemd: Add PrivateTmp and NoNewPrivileges options

PrivateTmp makes bluetoothd's /tmp and /var/tmp be inside a different
namespace. This is useful to secure access to temporary files of the
process.

NoNewPrivileges ensures that service process and all its children
can never gain new privileges through execve(), lowering the risk of
possible privilege escalations.
---
 src/bluetooth.service.in | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/bluetooth.service.in b/src/bluetooth.service.in
index f799f65f0..a6f3030f9 100644
--- a/src/bluetooth.service.in
+++ b/src/bluetooth.service.in
@@ -12,8 +12,14 @@ NotifyAccess=main
 #Restart=on-failure
 CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
 LimitNPROC=1
+
+# Filesystem lockdown
 ProtectHome=true
 ProtectSystem=full
+PrivateTmp=true
+
+# Privilege escalation
+NoNewPrivileges=true
 
 [Install]
 WantedBy=bluetooth.target
-- 
2.14.1

