[Container Detection] inode

by skyper 4 years ago

GNU/Linux ◆ screen-256color ◆ bash 278 views

Container technologies (chroot, LXC, …) are very common these days, especially since the massive adoption of Docker.

One of the use cases of container technologies is to isolate services from each others and from the host system. As a result, in case of an intrusion the attacker is in theory trapped inside a container. From the attacker’s perspective, it is important to be able to detect if a compromised service lives in a restricted environment such as a Docker container or if it runs directly on the host operating system.

One way to do so is to have a look at the inode of the / mount point (ls -id /). On the host system it will be very low (generally 1 or 2) whereas in a container it will generally be quite high (4851522 in the asciicast).

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