bane

AppArmor profile generator for docker containers. Basically a better AppArmor profile, than creating one by hand, because who would ever do that.

"Reviewing AppArmor profile pull requests is the bane of my existence"

• Jess Frazelle

Table of Contents

• Installation
  • Binaries
  • Via Go
• Usage
  • Config File
    • File Globbing
  • Installing a Profile
  • What does the generated profile look like?
  • Integration with Docker

Installation

Binaries

For installation instructions from binaries please visit the Releases Page.

Via Go

$ go get github.com/genuinetools/bane

Usage

$ bane -h
bane -  Custom AppArmor profile generator for docker containers

Usage: bane <command>

Flags:

  -d            enable debug logging (default: false)
  -profile-dir  directory for saving the profiles (default: /etc/apparmor.d/containers)

Commands:

  version  Show the version information.

Config File

sample.toml is a AppArmor sample config for nginx in a container.

File Globbing

Glob Example	Description
/dir/file	match a specific file
/dir/*	match any files in a directory (including dot files)
/dir/a*	match any file in a directory starting with a
/dir/*.png	match any file in a directory ending with .png
/dir/[^.]*	match any file in a directory except dot files
/dir/	match a directory
/dir/*/	match any directory within /dir/
/dir/a*/	match any directory within /dir/ starting with a
/dir/*a/	match any directory within /dir/ ending with a
/dir/**	match any file or directory in or below /dir/
/dir/**/	match any directory in or below /dir/
/dir/**[^/]	match any file in or below /dir/
/dir{,1,2}/**	match any file or directory in or below /dir/, /dir1/, and /dir2/

Installing a Profile

Now that we have our config file from above let's install it. bane will automatically install the profile in a directory /etc/apparmor.d/containers/ and run apparmor_parser.

$ sudo bane sample.toml
# Profile installed successfully you can now run the profile with
# `docker run --security-opt="apparmor:docker-nginx-sample"`

# now let's run nginx
$ docker run -d --security-opt="apparmor:docker-nginx-sample" -p 80:80 nginx

Using custom AppArmor profiles has never been easier!

Now let's try to do malicious activities with the sample profile:

$ docker run --security-opt="apparmor:docker-nginx-sample" -p 80:80 --rm -it nginx bash
root@6da5a2a930b9:~# ping 8.8.8.8
ping: Lacking privilege for raw socket.

root@6da5a2a930b9:/# top
bash: /usr/bin/top: Permission denied

root@6da5a2a930b9:~# touch ~/thing
touch: cannot touch 'thing': Permission denied

root@6da5a2a930b9:/# sh
bash: /bin/sh: Permission denied

root@6da5a2a930b9:/# dash
bash: /bin/dash: Permission denied

Sample dmesg output when using LogOnWritePaths:

[ 1964.142128] type=1400 audit(1444369315.090:38): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="docker-nginx" pid=3945 comm="apparmor_parser"
[ 1966.620327] type=1400 audit(1444369317.570:39): apparmor="AUDIT" operation="open" profile="docker-nginx" name="/1" pid=3985 comm="nginx" requested_mask="c" fsuid=0 ouid=0
[ 1966.624381] type=1400 audit(1444369317.574:40): apparmor="AUDIT" operation="mkdir" profile="docker-nginx" name="/var/cache/nginx/client_temp/" pid=3985 comm="nginx" requested_mask="c" fsuid=0 ouid=0
[ 1966.624446] type=1400 audit(1444369317.574:41): apparmor="AUDIT" operation="chown" profile="docker-nginx" name="/var/cache/nginx/client_temp/" pid=3985 comm="nginx" requested_mask="w" fsuid=0 ouid=0
[ 1966.624463] type=1400 audit(1444369317.574:42): apparmor="AUDIT" operation="mkdir" profile="docker-nginx" name="/var/cache/nginx/proxy_temp/" pid=3985 comm="nginx" requested_mask="c" fsuid=0 ouid=0
[ 1966.624494] type=1400 audit(1444369317.574:43): apparmor="AUDIT" operation="chown" profile="docker-nginx" name="/var/cache/nginx/proxy_temp/" pid=3985 comm="nginx" requested_mask="w" fsuid=0 ouid=0
[ 1966.624507] type=1400 audit(1444369317.574:44): apparmor="AUDIT" operation="mkdir" profile="docker-nginx" name="/var/cache/nginx/fastcgi_temp/" pid=3985 comm="nginx" requested_mask="c" fsuid=0 ouid=0
[ 1966.624534] type=1400 audit(1444369317.574:45): apparmor="AUDIT" operation="chown" profile="docker-nginx" name="/var/cache/nginx/fastcgi_temp/" pid=3985 comm="nginx" requested_mask="w" fsuid=0 ouid=0
[ 1966.624546] type=1400 audit(1444369317.574:46): apparmor="AUDIT" operation="mkdir" profile="docker-nginx" name="/var/cache/nginx/uwsgi_temp/" pid=3985 comm="nginx" requested_mask="c" fsuid=0 ouid=0
[ 1966.624582] type=1400 audit(1444369317.574:47): apparmor="AUDIT" operation="chown" profile="docker-nginx" name="/var/cache/nginx/uwsgi_temp/" pid=3985 comm="nginx" requested_mask="w" fsuid=0 ouid=0

What does the generated profile look like?

For the above sample.toml the generated profile is available as docker-nginx-sample.

Integration with Docker

This was originally a proof of concept for what will hopefully become a native security profile in the Docker engine. For more information on this, see docker/docker#17142.