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host-sflow agent
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cannot start hsflowd on /proc hardened folder #37

Closed bigHosting closed 4 years ago

bigHosting commented 4 years ago

I was testing hsflowd on one of my CentOS VMs, and it seems that service cannot be started on systems where /proc is not the usual 0755 . On public-facing servers, the procedure is to harden folders and files to break kernel exploits.

When I started hsflowd with /proc 0550, it crashed and strace showed that is was trying to use user nobody and process wanted to read interface information from /proc

Is there an ( easy ) way to change the user through the /etc/ config ? If not, I'll live with it as I realize my environment is not a typical one :)

Feel free to close this ticket is the answer is no :)

Thank you!

sflow commented 4 years ago

You could add "-P" to the command line that invokes hsflowd (e.g. in /lib/systemd/system/hsflowd.service). That stops it from dropping privileges from root->nobody.

Maybe we should automatically avoid dropping privileges if we discover that /proc would become unreadable?

Another approach might be to run hsflowd as a container and then you can control how (and where) the server's /proc appears to it.

bigHosting commented 4 years ago

My bad, I should have checked switches. That works perfectly fine. Thank you