# About SELinux

A few readings from the internet.

## Docker Default Security Option
https://docs.docker.com/engine/security/seccomp/

```bash
# docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.6.1-docker)
  scan: Docker Scan (Docker Inc., v0.8.0)

Server:
 Containers: 17
  Running: 15
  Paused: 0
  Stopped: 2
 Images: 16
 Server Version: 20.10.8
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: runc io.containerd.runc.v2 io.containerd.runtime.v1.linux
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: e25210fe30a0a703442421b0f60afac609f950a3
 runc version: v1.0.1-0-g4144b63
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 3.10.0-1160.42.2.el7.x86_64
 Operating System: Red Hat Enterprise Linux Server 7.9 (Maipo)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 23.39GiB
 Name: gene-k8s-k8sc-node1
 ID: VGBN:P5LX:RTQG:OX67:INYM:ZUHD:W6NQ:FWWL:KUV5:NZ6N:2DKH:ZIYL
 Docker Root Dir: /opt/nsp/docker
 Debug Mode: false
  Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
   127.0.0.0/8
 Live Restore Enabled: false

WARNING: API is accessible on http://0.0.0.0:2375 without encryption.
         Access to the remote API is equivalent to root access on the host. Refer
         to the 'Docker daemon attack surface' section in the documentation for
         more information: https://docs.docker.com/go/attack-surface/
[root@gene-k8s-k8sc-node1 ~]# sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   permissive
Mode from config file:          permissive
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      31
[root@gene-k8s-k8sc-node1 ~]# ps -eZ | grep docker
system_u:system_r:unconfined_service_t:s0 1254 ? 00:00:00 docker
system_u:system_r:container_runtime_t:s0 30862 ? 00:02:10 dockerd
system_u:system_r:container_runtime_t:s0 30976 ? 00:00:00 docker
[root@gene-k8s-k8sc-node1 ~]# docker context ls
NAME        DESCRIPTION                               DOCKER ENDPOINT               KUBERNETES ENDPOINT                ORCHESTRATOR
default *   Current DOCKER_HOST based configuration   unix:///var/run/docker.sock   https://127.0.0.1:6443 (default)   swarm
```

https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html

## What is SELinux
https://www.redhat.com/en/topics/linux/what-is-selinux

## SELinux Cheat Sheet
https://opensource.com/article/18/7/sysadmin-guide-selinux
https://opensource.com/article/18/8/cheat-sheet-selinux

## Reference
https://opensource.com/article/20/11/selinux-containers