-AGL framework overview
-======================
-
-Foreword
---------
-
-This document describes what we intend to do. It may happen that our
-current implementation and the content of this document differ.
-
-In case of differences, it is assumed that this document is right
-and the implementation is wrong.
-
-
-Introduction
-------------
-
-During the first works in having the security model of Tizen
-integrated in AGL (Automotive Grade Linux) distribution, it became
-quickly obvious that the count of components specific to Tizen
-to integrate was huge.
-
-Here is a minimal list of what was needed:
-
- - platform/appfw/app-installers
- - platform/core/security/cert-svc
- - platform/core/appfw/ail
- - platform/core/appfw/aul-1
- - platform/core/appfw/libslp-db-util
- - platform/core/appfw/pkgmgr-info
- - platform/core/appfw/slp-pkgmgr
-
-But this list isn't complete because many dependencies are hidden.
-Those hidden dependencies are including some common libraries but also many
-tizen specific sub-components (iniparser, bundle, dlog, libtzplatform-config,
-db-util, vconf-buxton, ...).
-
-This is an issue because AGL is not expected to be Tizen. Taking it would
-either need to patch it for removing unwanted components or to take all
-of them.
-
-However, a careful study of the core components of the security framework
-of Tizen showed that their dependencies to Tizen are light (and since some
-of our work, there is no more dependency to tizen).
-Those components are **cynara**, **security-manager**, **D-Bus aware of cynara**.
-
-Luckily, these core security components of Tizen are provided
-by [meta-intel-iot-security][meta-intel], a set of yocto layers.
-These layers were created by Intel to isolate Tizen specific security
-components from the initial port of Tizen to Yocto.
-The 3 layers are providing components for:
-
- * Implementing Smack LSM
- * Implementing Integrity Measurement Architecture
- * Implementing Tizen Security Framework
-
-The figure below shows the history of these layers.
-
-![Security_model_history][Security_model_history]
-
-We took the decision to use these security layers that provide the
-basis of the Tizen security, the security framework.
-
-For the components of the application framework, built top of
-the security framework, instead of pulling the huge set of packages
-from Tizen, we decided to refit it by developing a tiny set of
-components that would implement the same behaviour but without all
-the dependencies and with minor architectural improvements for AGL.
-
-These components are **afm-system-daemon** and **afm-user-daemon**.
-They provides infrastructure for installing, uninstalling,
-launching, terminating, pausing and resuming applications in
-a multi user secure environment.
-
-A third component exists in the framework, the binder **afb-daemon**.
-The binder provides the easiest way to provide secured API for
-any tier. Currently, the use of the binder is not absolutely mandatory.
-
-This documentation explains the framework created by IoT.bzh
-by rewriting the Tizen Application Framework. Be aware of the
-previous foreword.
-
-<!-- pagebreak -->
-Overview
---------
-
-The figure below shows the major components of the framework
-and their interactions going through the following scenario:
-APPLICATION installs an other application and then launch it.
-
-![AppFW-APP_install_sequences][AppFW-APP_install_sequences]{style width:70%}
-
-Let follow the sequence of calls:
-
-1. APPLICATION calls its **binder** to install the OTHER application.
-
-2. The binding **afm-main-binding** of the **binder** calls, through
- **D-Bus** system, the system daemon to install the OTHER application.
-
-3. The system **D-Bus** checks wether APPLICATION has the permission
- or not to install applications by calling **CYNARA**.
-
-4. The system **D-Bus** transmits the request to **afm-system-daemon**.
-
- **afm-system-daemon** checks the application to install, its
- signatures and rights and install it.
-
-5. **afm-system-daemon** calls **SECURITY-MANAGER** for fulfilling
- security context of the installed application.
-
-6. **SECURITY-MANAGER** calls **CYNARA** to install initial permissions
- for the application.
-
-7. APPLICATION call its binder to start the nearly installed OTHER application.
-
-8. The binding **afm-main-binding** of the **binder** calls, through
- **D-Bus** session, the user daemon to launch the OTHER application.
-
-9. The session **D-Bus** checks wether APPLICATION has the permission
- or not to start an application by calling **CYNARA**.
-
-10. The session **D-Bus** transmits the request to **afm-user-daemon**.
-
-11. **afm-user-daemon** checks wether APPLICATION has the permission
- or not to start the OTHER application **CYNARA**.
-
-12. **afm-user-daemon** uses **SECURITY-MANAGER** features to set
- the security context for the OTHER application.
-
-13. **afm-user-daemon** launches the OTHER application.
-
-This scenario does not cover all the features of the frameworks.
-Shortly because details will be revealed in the next chapters,
-the components are:
-
-* ***SECURITY-MANAGER***: in charge of setting Smack contexts and rules,
- of setting groups, and, of creating initial content of *CYNARA* rules
- for applications.
-
-* ***CYNARA***: in charge of handling API access permissions by users and by
- applications.
-
-* ***D-Bus***: in charge of checking security of messaging. The usual D-Bus
- security rules are enhanced by *CYNARA* checking rules.
-
-* ***afm-system-daemon***: in charge of installing and uninstalling applications.
-
-* ***afm-user-daemon***: in charge of listing applications, querying application details,
- starting, terminating, pausing, resuming applications and their instances
- for a given user context.
-
-* ***afb-binder***: in charge of serving resources and features through an
- HTTP interface.
-
-* ***afm-main-binding***: This binding allows applications to use the API
- of the AGL framework.
-
-
-Links between the "Security framework" and the "Application framework"
-----------------------------------------------------------------------
-
-The security framework refers to the security model used to ensure
-security and to the tools that are provided for implementing that model.
-
-The security model refers to how DAC (Discretionary Access Control),
-MAC (Mandatory Access Control) and Capabilities are used by the system
-to ensure security and privacy. It also includes features of reporting
-using audit features and by managing logs and alerts.
-
-The application framework manages the applications:
-installing, uninstalling, starting, pausing, listing ...
-
-The application framework uses the security model/framework
-to ensure the security and the privacy of the applications that
-it manages.
-
-The application framework must be compliant with the underlying
-security model/framework. But it should hide it to the applications.
-
-
-The security framework
-----------------------
-
-The implemented security model is the security model of Tizen 3.
-This model is described [here][tizen-secu-3].
-
-The security framework then comes from Tizen 3 but through
-the [meta-intel].
-It includes: **Security-Manager**, **Cynara**
-and **D-Bus** compliant to Cynara.
-
-Two patches are applied to the security-manager. The goal of these patches
-is to remove specific dependencies with Tizen packages that are not needed
-by AGL.
-None of these patches adds or removes any behaviour.
-
-**In theory, the security framework/model is an implementation details
-that should not impact the layers above the application framework**.
-
-The security framework of Tizen provides "nice lad" a valuable component to
-scan log files and analyse auditing. This component is still in development.
-
-
-The application framework
--------------------------
-
-The application framework on top of the security framework
-provides the components to install and uninstall applications
-and to run it in a secured environment.
-
-The goal is to manage applications and to hide the details of
-the security framework to the applications.
-
-For the reasons explained in introduction, we did not used the
-application framework of Tizen as is but used an adaptation of it.
-
-The basis is kept identical: the applications are distributed
-in a digitally signed container that must match the specifications
-of widgets (web applications). This is described by the technical
-recommendations [widgets] and [widgets-digsig] of the W3 consortium.
-
-This model allows the distribution of HTML, QML and binary applications.
-
-The management of signatures of the widget packages.
-This basis is not meant as being rigid and it can be extended in the
-future to include for example incremental delivery.
-
-
-[meta-intel]: https://github.com/01org/meta-intel-iot-security "A collection of layers providing security technologies"
-[widgets]: http://www.w3.org/TR/widgets "Packaged Web Apps"
-[widgets-digsig]: http://www.w3.org/TR/widgets-digsig "XML Digital Signatures for Widgets"
-[libxml2]: http://xmlsoft.org/html/index.html "libxml2"
-[openssl]: https://www.openssl.org "OpenSSL"
-[xmlsec]: https://www.aleksey.com/xmlsec "XMLSec"
-[json-c]: https://github.com/json-c/json-c "JSON-c"
-[d-bus]: http://www.freedesktop.org/wiki/Software/dbus "D-Bus"
-[libzip]: http://www.nih.at/libzip "libzip"
-[cmake]: https://cmake.org "CMake"
-[security-manager]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Security_Manager "Security-Manager"
-[app-manifest]: http://www.w3.org/TR/appmanifest "Web App Manifest"
-[tizen-security]: https://wiki.tizen.org/wiki/Security "Tizen security home page"
-[tizen-secu-3]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Overview "Tizen 3 security overview"
-[AppFW-APP_install_sequences]: pictures/AppFW-APP_install_sequences.svg
-[Security_model_history]: pictures/Security_model_history.svg
+Document revisions
+==================
+
+| Date | Version | Designation | Author |
+|--------------|---------|----------------------------------------------|-------------------------------------------------------|
+| 23 May 2016 | 0.9 | Initial release | J. Bollo [ IoT.bzh ] <br/> M. Bachmann [ IoT.bzh ] |
+| 30 May 2016 | 1.0 | Master document edition, final review | S. Desneux [ IoT.bzh ] <br/> F. Ar Foll [ IoT.bzh ] |
+| 21 Sept 2016 | 2.0 | Updated with new sections (events,widgets) | J. Bollo [ IoT.bzh ] <br/> S. Desneux [ IoT.bzh ] |
+| 12 Dec 2016 | 2.1 | Updated for CC Release | S. Desneux [ IoT.bzh ] |
+| 14 Dec 2016 | 3.0 | Minor fixes, alignment with CC version | S. Desneux [ IoT.bzh ] |
+| 20 Mar 2017 | 3.1 | Systemd integration | J. Bollo [ IoT.bzh ] <br/> S. Desneux [ IoT.bzh ] |
+| 21 Jun 2017 | 4.0 | Update for AGL DD | J. Bollo [ IoT.bzh ] <br/> S. Desneux [ IoT.bzh ] |
Code Review / src / app-framework-main.git / blobdiff