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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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Labs

Path Info

Level
Clock icon Intermediate
Duration
Clock icon 45m
Last updated
Clock icon Apr 06, 2025

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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
    

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