Add initial profile guidelines.

CONTRIBUTING.md

@@ -0,0 +1,148 @@
+# 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][git].
+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:
+   ```sh
+   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>
+}
+```
+
+3. 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`
+
+4. 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
+
+* https://gitlab.com/apparmor/apparmor/-/wikis/AppArmor_Core_Policy_Reference
+* https://presentations.nordisch.org/apparmor/#/
+
+[git]: https://help.github.com/articles/set-up-git/

README.md

@@ -138,7 +138,8 @@ Here an overview of the current CI jobs:
 
 ## Contribution
 
-Feedbacks, contributors, pull requests, are all very welcome.
+Feedbacks, contributors, pull requests are all very welcome. Please read the
+[`CONTRIBUTING.md`](CONTRIBUTING.md) file for more details on the contribution process.
 
 
 ## License