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<a name="Application.framework"></a>
<h1>Application framework</h1>
<pre><code>version: 1
Date: 30 mai 2016
Author: José Bollo
</code></pre>
<p><ul>
<li><a href="#Application.framework">Application framework</a>
<ul>
<li><a href="#Foreword">Foreword</a></li>
<li><a href="#Overview">Overview</a></li>
<li><a href="#Comparison.to.other.frameworks">Comparison to other frameworks</a>
<ul>
<li><a href="#Tizen.framework">Tizen framework</a></li>
<li><a href="#xdg-app">xdg-app</a></li>
<li><a href="#ostro">ostro</a>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="#organization.of.directory.of.applications">organization of directory of applications</a>
<ul>
<li><a href="#Identity.of.installed.files">Identity of installed files</a></li>
<li><a href="#labeling.the.directories.of.applications">labeling the directories of applications</a></li>
</ul>
</li>
<li><a href="#organization.of.data">organization of data</a></li>
<li><a href="#Setting.Smack.rules.for.the.application">Setting Smack rules for the application</a></li>
<li><a href="#What.user.can.run.an.application.">What user can run an application?</a></li>
</ul></p>
<a name="Foreword"></a>
<h2>Foreword</h2>
<p>This document describes application framework fundamentals.
FCF (Fully Conform to Specification) implementation is still under development.
It may happen that current implementation somehow diverges with specifications.</p>
<a name="Overview"></a>
<h2>Overview</h2>
<p>The application framework on top of the security framework
provides components to install and uninstall applications
as well as to run them in a secured environment.</p>
<p>The goal of the framework is to manage applications and hide security details
to applications.</p>
<p>For the reasons explained in introduction, it was choose not to reuse Tizen
application framework directly, but to rework a new framework inspired from Tizen.</p>
<p>fundamentals remain identical: the applications are distributed
in a digitally signed container that should match widget specifications
normalized by the W3C. This is described by the technical
recommendations <a href="http://www.w3.org/TR/widgets" title="Packaged Web Apps">widgets</a> and <a href="http://www.w3.org/TR/widgets-digsig" title="XML Digital Signatures for Widgets">widgets-digsig</a> of the W3 consortium.</p>
<p>As today this model allows the distribution of HTML, QML and binary applications
but it could be extended to any other class of applications.</p>
<p>The management of widget package signatures.
Current model is only an initial step, it might be extended in the
future to include new feature (ie: incremental delivery).</p>
<a name="Comparison.to.other.frameworks"></a>
<h2>Comparison to other frameworks</h2>
<a name="Tizen.framework"></a>
<h3>Tizen framework</h3>
<a name="xdg-app"></a>
<h3>xdg-app</h3>
<a name="ostro"></a>
<h3>ostro</h3>
<a name="organization.of.directory.of.applications"></a>
<h1>organization of directory of applications</h1>
<p>The main path for applications are: APPDIR/PKGID/VER.</p>
<p>Where:</p>
<ul>
<li>APPDIR is as defined above</li>
<li>PKGID is a directory whose name is the package identifier</li>
<li>VER is the version of the package MAJOR.MINOR</li>
</ul>
<p>The advantage of such an organization is to allow several versions to live together.
This is required for multiple reasons (ie: roll back) and to comply with developers habits.</p>
<a name="Identity.of.installed.files"></a>
<h2>Identity of installed files</h2>
<p>All the files are installed as user “userapp” and group “userapp”.
All files have rw(x) for user and r-(x) for group and others.</p>
<p>This allows any user to read files.</p>
<a name="labeling.the.directories.of.applications"></a>
<h2>labeling the directories of applications</h2>
<a name="organization.of.data"></a>
<h1>organization of data</h1>
<p>The data of a user are contain within its directory and are labeled using the application labels</p>
<a name="Setting.Smack.rules.for.the.application"></a>
<h1>Setting Smack rules for the application</h1>
<p>For Tizen, the following rules are set by the security manager for each application.</p>
<pre><code>System ~APP~ rwx
System ~PKG~ rwxat
System ~PKG~::RO rwxat
~APP~ System wx
~APP~ System::Shared rxl
~APP~ System::Run rwxat
~APP~ System::Log rwxa
~APP~ _ l
User ~APP~ rwx
User ~PKG~ rwxat
User ~PKG~::RO rwxat
~APP~ User wx
~APP~ User::Home rxl
~APP~ User::App::Shared rwxat
~APP~ ~PKG~ rwxat
~APP~ ~PKG~::RO rxl
</code></pre>
<p>Here, ~PKG~ is the identifier of the package and ~APP~ is the identifier of the application.</p>
<a name="What.user.can.run.an.application."></a>
<h1>What user can run an application?</h1>
<p>Not all user are able to run all applications.
How to manage that?</p>
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