From 8893d389a8294edf2a6354365b89da8da8eda417 Mon Sep 17 00:00:00 2001
From: Florian Klink <flokli@flokli.de>
Date: Tue, 23 Apr 2024 16:06:30 +0300
Subject: [PATCH] nsncd.service: run as non-root

This updates the nsncd.service systemd unit file to run nsncd as a
`nscd` user and group, and enables sandboxing.

Fixes #14.
---
 README.md     |  4 ++++
 nsncd.service | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/README.md b/README.md
index 83351f7..6715c8b 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,10 @@ and mailing lists.
 Just run the `nsncd` binary and it will listen at `/var/run/nscd/socket`.
 There's a simple `systemd` unit file, too.
 
+It will run `nsncd` as the `nscd` user and group, and apply some sandboxing.
+It also relies on the systemd `RuntimeDirectory=` functionality to create the
+directory at `/var/run/nscd` with appropriate permissions.
+
 If you're on a Debian-based system, you can use the provided Debian package to
 install `nsncd` to run under `systemd`. See `debian/README.source` for how to
 build it - we use a few Rust crates that aren't packaged for stable Debian
diff --git a/nsncd.service b/nsncd.service
index 99af01d..cc95625 100644
--- a/nsncd.service
+++ b/nsncd.service
@@ -17,6 +17,16 @@ Description=name-service non-caching daemon
 
 [Service]
 ExecStart=/usr/lib/nsncd
+User=nscd
+Group=nscd
+RemoveIPC=true
+PrivateTmp=true
+NoNewPrivileges=true
+RestrictSUIDSGID=true
+ProtectSystem=strict
+ProtectHome=read-only
+Restart=always
+RuntimeDirectory=nscd
 Restart=always
 Type=notify