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Symbolic links and Chroot

Started by johnblade · 8 months ago

Found this awesome little tip in the proftpd manual on how to work around symoblic links issues.
There are two types of links in Unix: hard and symbolic.
A hard link is a file that is, for all intents and purposes, the file to which it is linked. The difference between a hardlink and the l ... Continue reading »

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4 years ago

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Chris
4 years ago

I've been through a hundred threads saying there is no way around the chroot symlink problem. This page is incredibly helpful. OpenBSD doesn't have "mount -bind", but I believe there is a "mount_union" command which may work. I am investigating it now. I hope someone finds this as helpful as I did.

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4 years ago

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Kasper
4 years ago

Thanks for the tip. Here is my two cents.
I'm planning to run several Chrooted services on a single host. Evry service needs some executables, some libs etc., but i have only limmited storage capacity available. I don't want to break chrooting by mounting /bin, /usr/lib etc. in each service jail.
So i intend to do this:
- Copy every file, needed by more than one service, to its own directory.
- For alll services make mountpoints for each file the service needs in its jail.
- Mount --bind everything
- Use symlinks to get the structure needed in each service jail.
I might use LIDS (to restrict capabilities of root) for further security.

reply