systemd: restrict permissions #778
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Forwarder does not need that many permissions, we can restrict it to minimum. CAP_NET_BIND_SERVICE can be used to allow this user to bind to a port < 1024 if desired. The work is based on wireproxy's systemd configuration[1]. Also I found systemd service hardening doc[2] helpful. DynamicUser/Strict system protection didn't work as package installs forwarder binary at /usr/bin. [1] pufferffish/wireproxy#103. [2] https://gist.github.com/ageis/f5595e59b1cddb1513d1b425a323db04
Running systemd service in a container is not very common. We use it for testing, however it has its disadvantages. Some container runtimes prohibit creating UTS namespaces. That leads to a warning: "forwarder.service: ProtectHostname=yes is configured, but UTS namespace setup is prohibited (container manager?), ignoring namespace setup." Giving a container privileged mode fixes this issue.
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Forwarder does not need that many permissions, we can restrict it to minimum.
CAP_NET_BIND_SERVICE can be used to allow this user to bind to a port < 1024 if desired.
The work is based on wireproxy's systemd configuration[1]. Also I found systemd service hardening doc[2] helpful.
DynamicUser/Strict system protection didn't work as package installs forwarder binary at /usr/bin.
[1] pufferffish/wireproxy#103.
[2] https://gist.github.com/ageis/f5595e59b1cddb1513d1b425a323db04