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apparmor.d/CONTRIBUTING.md
Alexandre Pujol 949d441cfa
Add initial profile guidelines.
2022-01-15 21:20:27 +00:00

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Contributing

You want to contribute to apparmor.d, thank a lot for this. You will find in this page all the useful information needed to contribute.

How to contribute?

  1. If you don't have git on your machine, install it.
  2. Fork this repo by clicking on the fork button on the top of this page.
  3. Clone the repository and go to the directory: 
    git clone  https://github.com/this-is-you/apparmor.d.git
cd apparmor.d
  4. Create a branch: 
    git checkout -b my_contribution
  5. Make the changes and commit: 
    git add <files changed>
git commit -m "A message for sum up my contribution"
  6. Push changes to GitHub: 
    git push origin my_contribution
  7. Submit your changes for review: If you go to your repository on GitHub, you'll see a Compare & pull request button, fill and submit the pull request.

Add a profile

  1. To add a new profile foo, add the file foo in apparmor.d/profile-a-f. If your profile is part of a large group of profiles, it can also go in apparmor.d/groups.

  2. Write the profile content, the rules depend of the confined program, Here is the bare minimum for the program foo:

# apparmor.d - Full set of apparmor profiles
# Copyright (C) 2022 You <your@email>
# SPDX-License-Identifier: GPL-2.0-only

abi <abi/3.0>,

include <tunables/global>

@{exec_path} = /{usr/,}bin/foo
profile foo @{exec_path} {
  include <abstractions/base>

  @{exec_path} mr,

  include if exists <local/foo>
}

  1. You can automatically set the complain flag on your profile by editing the file dists/flags/main.flags and adding a new line with: foo complain

  2. Build & install for your distribution.

Profile Guidelines

In order to ensure a common structure across the profiles, all new profile should try to follow the guideline presented here.

The rules in the profile should be sorted as follow:

  • include
  • capability
  • ptrace
  • signal
  • network
  • mount
  • @{exec_path} mr,
  • The binaries and library required: /{usr/,}bin/, /{usr/,}lib/, /opt/...
  • The shared resources: /usr/share...
  • The system configuration: /etc...
  • The user data: owner @{HOME}/...
  • The user configuration (all dotfiles)
  • Temporary data: /tmp/, @{run}/...
  • Sys files: @{sys}/...
  • Proc files: @{PROC}/...
  • Dev files: /dev/...

Other rules

  • Do not use: /usr/lib or /usr/bin but /{usr/,}bin/ or /{usr/,}lib/.
  • Always use the apparmor variables.
  • In a rule block, the rule shall be alphabetically sorted.
  • When some file access share similar purpose, they shall be sorted together. Eg: 
    /etc/machine-id r,
/var/lib/dbus/machine-id r,

AppArmor variables

Included variables:

  • @{PROC}=/proc/
  • @{run}=/run/ /var/run/
  • @{sys}=/sys/
  • The Home directory: @{HOME}
  • Process id(s): @{pid}, @{pids}
  • User id: @{uid}
  • Thread id: @{tid}
  • Classic XDG user directories:
    • Desktop: @{XDG_DESKTOP_DIR}="Desktop"
    • Download: @{XDG_DOWNLOAD_DIR}="Downloads"
    • Templates: @{XDG_TEMPLATES_DIR}="Templates"
    • Public: @{XDG_PUBLICSHARE_DIR}="Public"
    • Documents: @{XDG_DOCUMENTS_DIR}="Documents"
    • Music: @{XDG_MUSIC_DIR}="Music"
    • Pictures: @{XDG_PICTURES_DIR}="Pictures"
    • Videos: @{XDG_VIDEOS_DIR}="Videos"

Additional variables available with this project:

  • Common mountpoints: @{MOUNTS}=/media/ @{run}/media /mnt
  • Extended XDG user directories:
    • Projects: @{XDG_PROJECTS_DIR}="Projects"
    • Books: @{XDG_BOOKS_DIR}="Books"
    • Wallpapers: @{XDG_WALLPAPERS_DIR}="Pictures/Wallpapers"
    • Sync: @{XDG_SYNC_DIR}="Sync"
    • Vm: @{XDG_VM_DIR}=".vm"
    • SSH: @{XDG_SSH_DIR}=".ssh"
    • GPG: @{XDG_GPG_DIR}=".gnupg"
    • Cache: @{XDG_CACHE_HOME}=".cache"
    • Config: @{XDG_CONFIG_HOME}=".config"
    • Data: @{XDG_DATA_HOME}=".local/share"
    • Bin: @{XDG_BIN_HOME}=".local/bin"
    • Lib: @{XDG_LIB_HOME}=".local/lib"
  • Full path of the user configuration directories
    • Cache: @{user_cache_dirs}=@{HOME}/@{XDG_CACHE_HOME}
    • Config: @{user_config_dirs}=@{HOME}/@{XDG_CONFIG_HOME}
    • Bin: @{user_bin_dirs}=@{HOME}/@{XDG_BIN_HOME}
    • Lib: @{user_lib_dirs}=@{HOME}/@{XDG_LIB_HOME}
  • Other full path user directories
    • Sync: @{user_sync_dirs}=@{HOME}/@{XDG_SYNC_DIR} @{MOUNTS}/*/@{XDG_SYNC_DIR}

Additional documentation