[PATCH 3/4] systemd: Add more filesystem lockdown

[Bastien Nocera <hadess@hadess.net>]

We can only access the configuration file as read-only and read-write
to the Bluetooth cache directory and sub-directories.
---
 Makefile.am              | 3 +++
 src/bluetooth.service.in | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 2ba25e687..82125c482 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -622,6 +622,9 @@ MAINTAINERCLEANFILES = Makefile.in \
 
 SED_PROCESS = $(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
 		$(SED) -e 's,@pkglibexecdir\@,$(pkglibexecdir),g' \
+		       -e 's,@libexecdir\@,$(libexecdir),g' \
+		       -e 's,@statedir\@,$(statedir),g' \
+		       -e 's,@confdir\@,$(confdir),g' \
 		< $< > $@
 
 if RUN_RST2MAN
diff --git a/src/bluetooth.service.in b/src/bluetooth.service.in
index 7c2f60bb4..4daedef2a 100644
--- a/src/bluetooth.service.in
+++ b/src/bluetooth.service.in
@@ -17,6 +17,10 @@ LimitNPROC=1
 ProtectHome=true
 ProtectSystem=full
 PrivateTmp=true
+ProtectKernelTunables=true
+ProtectControlGroups=true
+ReadWritePaths=@statedir@
+ReadOnlyPaths=@confdir@
 
 # Privilege escalation
 NoNewPrivileges=true
-- 
2.34.1