Development Guide

Development

1. Vagrant Environment (Recommended)

Note Skip the steps for the vagrant setup if you're directly compiling KubeArmor on the Linux host. Proceed here to setup K8s on the same host by resolving any dependencies.

• Requirements

  Here is the list of requirements for a Vagrant environment

  Vagrant - v2.2.9
  VirtualBox - v6.1

  Clone the KubeArmor github repository in your system

  $ git clone https://github.com/kubearmor/KubeArmor.git

  Install Vagrant and VirtualBox in your environment, go to the vagrant path and run the setup.sh file

  $ cd KubeArmor/contribution/vagrant
  ~/KubeArmor/contribution/vagrant$ ./setup.sh
  ~/KubeArmor/contribution/vagrant$ sudo reboot

• VM Setup using Vagrant

  Now, it is time to prepare a VM for development.

  To create a vagrant VM

  ~/KubeArmor/KubeArmor$ make vagrant-up

  Output will show up as ...

  Click to expand!

  cd /home/gourav/KubeArmor/contribution/vagrant; NETNEXT=0 DLV_RPORT=2345 vagrant up; true
  Bringing machine 'kubearmor-dev' up with 'virtualbox' provider...
  ==> kubearmor-dev: Importing base box 'ubuntu/bionic64'...
  ==> kubearmor-dev: Matching MAC address for NAT networking...
  ==> kubearmor-dev: Checking if box 'ubuntu/bionic64' version '20220131.0.0' is up to date...
  ==> kubearmor-dev: Setting the name of the VM: kubearmor-dev
  ==> kubearmor-dev: Clearing any previously set network interfaces...
  ==> kubearmor-dev: Preparing network interfaces based on configuration...
      kubearmor-dev: Adapter 1: nat
  ==> kubearmor-dev: Forwarding ports...
      kubearmor-dev: 2345 (guest) => 2345 (host) (adapter 1)
      kubearmor-dev: 22 (guest) => 2222 (host) (adapter 1)
  ==> kubearmor-dev: Running 'pre-boot' VM customizations...
  ==> kubearmor-dev: Booting VM...
  ==> kubearmor-dev: Waiting for machine to boot. This may take a few minutes...
      kubearmor-dev: SSH address: 127.0.0.1:2222
      kubearmor-dev: SSH username: vagrant
      kubearmor-dev: SSH auth method: private key
      kubearmor-dev: Warning: Connection reset. Retrying...
      kubearmor-dev: Warning: Remote connection disconnect. Retrying...
      kubearmor-dev:
      kubearmor-dev: Vagrant insecure key detected. Vagrant will automatically replace
      kubearmor-dev: this with a newly generated keypair for better security.
      kubearmor-dev:
      kubearmor-dev: Inserting generated public key within guest...
      kubearmor-dev: Removing insecure key from the guest if it's present...
      kubearmor-dev: Key inserted! Disconnecting and reconnecting using new SSH key...
  ==> kubearmor-dev: Machine booted and ready!
  ==> kubearmor-dev: Checking for guest additions in VM...
      kubearmor-dev: The guest additions on this VM do not match the installed version of
      kubearmor-dev: VirtualBox! In most cases this is fine, but in rare cases it can
      kubearmor-dev: prevent things such as shared folders from working properly. If you see
      kubearmor-dev: shared folder errors, please make sure the guest additions within the
      kubearmor-dev: virtual machine match the version of VirtualBox you have installed on
      kubearmor-dev: your host and reload your VM.
      kubearmor-dev:
      kubearmor-dev: Guest Additions Version: 5.2.42
      kubearmor-dev: VirtualBox Version: 6.1
  ==> kubearmor-dev: Setting hostname...
  ==> kubearmor-dev: Mounting shared folders...
      kubearmor-dev: /vagrant => /home/gourav/KubeArmor/contribution/vagrant
      kubearmor-dev: /home/vagrant/KubeArmor => /home/gourav/KubeArmor
  ==> kubearmor-dev: Running provisioner: file...
      kubearmor-dev: ~/.ssh/id_rsa.pub => /home/vagrant/.ssh/id_rsa.pub
  ==> kubearmor-dev: Running provisioner: shell...
      kubearmor-dev: Running: inline script
  ==> kubearmor-dev: Running provisioner: file...
      kubearmor-dev: ~/.gitconfig => $HOME/.gitconfig
  ==> kubearmor-dev: Running provisioner: shell...
      kubearmor-dev: Running: /tmp/vagrant-shell20220202-55671-bn8u0f.sh
      ...

  To get into the vagrant VM

  ~/KubeArmor/KubeArmor$ make vagrant-ssh

  Output will show up as ...

  Click to expand!

  d /home/gourav/KubeArmor/contribution/vagrant; NETNEXT=0 DLV_RPORT=2345 vagrant ssh; true
  Welcome to Ubuntu 18.04.6 LTS (GNU/Linux 4.15.0-167-generic x86_64)
  
   * Documentation:  https://help.ubuntu.com
   * Management:     https://landscape.canonical.com
   * Support:        https://ubuntu.com/advantage
  
    System information as of Wed Feb  2 10:35:55 UTC 2022
  
    System load:  0.06               Processes:              128
    Usage of /:   11.1% of 38.71GB   Users logged in:        0
    Memory usage: 10%                IP address for enp0s3:  10.0.2.15
    Swap usage:   0%                 IP address for docker0: 172.17.0.1
  
  
  5 updates can be applied immediately.
  1 of these updates is a standard security update.
  To see these additional updates run: apt list --upgradable
  
  New release '20.04.3 LTS' available.
  Run 'do-release-upgrade' to upgrade to it.
  
  
  vagrant@kubearmor-dev:~$

  To destroy the vagrant VM

  ~/KubeArmor/KubeArmor$ make vagrant-destroy

  • VM Setup using Vagrant with Ubuntu 21.10 (v5.13)

    To use the recent Linux kernel v5.13 for dev env, you can run make with the NETNEXT flag set to 1 for the respective make option.

    ~/KubeArmor/KubeArmor$ make vagrant-up NETNEXT=1

    You can also make the setting static by changing NETNEXT=0 to NETNEXT=1 in the Makefile.

    ~/KubeArmor/KubeArmor$ vi Makefile

2. Self-managed Kubernetes

• Requirements

  Here is the list of minimum requirements for self-managed Kubernetes.

  OS - Ubuntu 18.04
  Kubernetes - v1.19
  Docker - 18.09 or Containerd - 1.3.7
  Linux Kernel - v4.15
  LSM - AppArmor

  KubeArmor is designed for Kubernetes environment. If Kubernetes is not setup yet, please refer to Kubernetes installation guide. KubeArmor leverages CRI (Container Runtime Interfaces) APIs and works with Docker or Containerd or CRIO based container runtimes. KubeArmor uses LSMs for policy enforcement; thus, please make sure that your environment supports LSMs (either AppArmor or bpf-lsm). Otherwise, KubeArmor will operate in Audit-Mode with no policy "enforcement" support.

  Alternative Setup

  You can try the following alternative if you face any difficulty in the above Kubernetes (kubeadm) setup.

  Note Please make sure to set up the alternative k8s environment on the same host where the KubeArmor development environment is running.

  • K3s

    You can also develop and test KubeArmor on K3s instead of the self-managed Kubernetes. Please follow the instructions in K3s installation guide.

  • MicroK8s

    You can also develop and test KubeArmor on MicroK8s instead of the self-managed Kubernetes. Please follow the instructions in MicroK8s installation guide.

  • No Support - Docker Desktops

    KubeArmor does not work with Docker Desktops on Windows and macOS because KubeArmor integrates with Linux-kernel native primitives (including LSMs).

• Development Setup

  In order to install all dependencies, please run the following command.

  $ cd KubeArmor/contribution/self-managed-k8s
  ~/KubeArmor/contribution/self-managed-k8s$ ./setup.sh

  setup.sh will automatically install BCC, Go, Protobuf, and some other dependencies.

  Now, you are ready to develop any code for KubeArmor. Enjoy your journey with KubeArmor.

3. Environment Check

• Compilation

  Check if KubeArmor can be compiled on your environment without any problems.

  $ cd KubeArmor/KubeArmor
  ~/KubeArmor/KubeArmor$ make

  If you see any error messages, please let us know the issue with the full error messages through #kubearmor-development channel on CNCF slack.

• Execution

  In order to directly run KubeArmor in a host (not as a container), you need to run a local proxy in advance.

  $ kubectl proxy &

  Then, run KubeArmor on your environment.

  $ cd KubeArmor/KubeArmor
  ~/KubeArmor/KubeArmor$ make run

  Note If you have followed all the above steps and still getting the warning The node information is not available, then this could be due to the case-sensitivity discrepancy in the actual hostname (obtained by running hostname) and the hostname used by Kubernetes (under kubectl get nodes -o wide).
  K8s converts the hostname to lowercase, which results in a mismatch with the actual hostname.
  To resolve this, change the hostname to lowercase using the command hostnamectl set-hostname <lowercase-hostname>.

• KubeArmor Controller

  Starting from KubeArmor v0.11 - annotations, container policies, and host policies are handled via kubearmor controller, the controller code can be found under pkg/KubeArmorController.

  To install the controller from KubeArmor docker repository run

  $ cd KubeArmor/pkg/KubeArmorController
  ~/KubeArmor/pkg/KubeArmorController$ make deploy

  To install the controller (local version) to your cluster run

  $ cd KubeArmor/pkg/KubeArmorController
  ~/KubeArmor/pkg/KubeArmorController$ make docker-build deploy

  if you need to setup a local registry to push you image, use docker-registry.sh script under ~/KubeArmor/contribution/local-registry directory

Code Directories

Here, we briefly give you an overview of KubeArmor's directories.

• Source code for KubeArmor (/KubeArmor)

  KubeArmor/
    BPF                  - eBPF code for system monitor
    common               - Libraries internally used
    config               - Configuration loader
    core                 - The main body (start point) of KubeArmor
    enforcer             - Runtime policy enforcer (enforcing security policies into LSMs)
    feeder               - gRPC-based feeder (sending audit/system logs to a log server)
    kvmAgent             - KubeArmor VM agent
    log                  - Message logger (stdout)
    monitor              - eBPF-based system monitor (mapping process IDs to container IDs)
    policy               - gRPC service to manage Host Policies for VM environments
    types                - Type definitions
  protobuf/              - Protocol buffer

• Source code for KubeArmor Controller (CRD)

  pkg/KubeArmorController/  - KubeArmorController generated by Kube-Builder for KubeArmor Annotations, KubeArmorPolicy and KubeArmorHostPolicy

• Deployment tools and files for KubeArmor

  deployments/
    <cloud-platform-name>   - Deployments specific to respective cloud platform (deprecated - use karmor install or helm)
    controller              - Deployments for installing KubeArmorController alongwith cert-manager
    CRD                     - KubeArmorPollicy and KubeArmorHostPolicy CRDs
    get                     - Stores source code for deploygen, a tool used for specifying kubearmor deployments
    helm/
        KubeArmor           - KubeArmor's Helm chart
        KubeArmorOperator   - KubeArmorOperator's Helm chart

• Files for testing

  examples/     - Example microservices for testing
  tests/        - Automated test framework for KubeArmor