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I'm trying to start BoringTun with setcap in order for it to run unprivileged but still have the ability to fmark:

root@67672793823c:/# setcap cap_net_admin+epi /usr/local/sbin/boringtun --foreground wgnet0
fatal error: Invalid argument
usage: setcap [-q] [-v] (-r|-|<caps>) <filename> [ ... (-r|-|<capsN>) <filenameN> ]

 Note <filename> must be a regular (non-symlink) file.

The man page doesn't seem very helpful and I can't find an option which will allow me to execute a binary with arbitrary arguments.

If I remove the arguments, everything works, but I need to pass these arguments.

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setcap stores the given capabilities in the given file’s metadata (as extended attributes, see the Arch wiki for details):

setcap cap_net_admin+epi /usr/local/sbin/boringtun

means that boringtun will have those capabilities when it’s run thereafter:

/usr/local/sbin/boringtun --foreground wgnet0
  • Oh, fascinating; it actually writes to the file? – Naftuli Kay Apr 4 at 21:56
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    Not to the file itself, to its extended attributes. – Stephen Kitt Apr 5 at 3:41

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