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Configure a Custom Seccomp Profile

In this lab, we need to create a custom seccomp profile which has a default action to allow system calls to occur and bans certain listed system calls. After that, we need to run a test container with our seccomp profile. With that, we will need to conduct some tests to see if the calls on the list were banned or not.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 45m
Published
Clock icon Apr 03, 2020

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Table of Contents

  1. Challenge

    Check Seccomp Capabilities

    grep SECCOMP /boot/config-$(uname -r)

    Expected output:

    CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
CONFIG_SECCOMP_FILTER=y
CONFIG_SECCOMP=y

  2. Challenge

    Create Our Own Policy and Override the Default Seccomp Profile

    vim /home/cloud_user/myProfile.json

    {
  "defaultAction": "SCMP_ACT_ALLOW",
  "architectures": [
      "SCMP_ARCH_X86_64"
  ],
  "syscalls": [
    {
      "name": "chmod",
      "action": "SCMP_ACT_ERRNO"
    },
    {
      "name": "fchmod",
      "action": "SCMP_ACT_ERRNO"
    },
    {
      "name": "fchmodat",
      "action": "SCMP_ACT_ERRNO"
    },
    {
      "name": "mkdir",
      "action": "SCMP_ACT_ERRNO"
    }
  ]
}

    ESC
:wq
ENTER

  3. Challenge

    Run a Container with a Custom Seccomp Profile

    sudo docker run --rm -it --security-opt seccomp=/home/cloud_user/myProfile.json debian:jessie sh

  4. Challenge

    Test the Restrictions within the Container

    The following should be denied.

    mkdir test

    Expected output:

    mkdir: cannot create directory 'test': Operation not permitted

    The following should work.

    touch testFile

    The following should be denied.

    chmod +x testFile

    Expected output:

    chmod: changing permissions of 'testFile': Operation not permitted
A Cloud Guru - Labs - Configure a Custom Seccomp Profile
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A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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