systemd: tight sandboxing #103
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wireproxy needs very little permissions, we can restrict it to basically nothing. DynamicUser means the system will generate a UID on demand for service, also CAP_NET_BIND_SERVICE can be used to allow this user to bind to a port < 1024 if desired. Also LoadCredential lets us read a file with tight permissions i.e. root:root 0400 and pass it to only wireproxy in an ephemeral and constrained manner. Signed-off-by: J. Dekker <[email protected]>
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This is interesting, for OpenBSD wireproxy would automatically use |
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Thanks for these improvements! I'm not a pro with systemd units so I'm glad someone took a look |
Choraden
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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
Choraden
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Apr 8, 2024
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
mmatczuk
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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
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wireproxy needs very little permissions, we can restrict it to basically nothing.
DynamicUsermeans the system will generate a UID on demand for service, alsoCAP_NET_BIND_SERVICEcan be used to allow this user to bind to a port < 1024 if desired.LoadCredentiallets us read a file with tight permissions i.e.root:root 0400and pass it to only wireproxy in an ephemeral and constrained manner.