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diff --git a/docs/security-blueprint/part-6/0_Abstract.md b/docs/security-blueprint/part-6/0_Abstract.md new file mode 100644 index 0000000..3617dbd --- /dev/null +++ b/docs/security-blueprint/part-6/0_Abstract.md @@ -0,0 +1,80 @@ +# Part 6 - Application + +## Abstract + +**Application Hardening**: Best practices to apply to the build and release of +user space applications, in order to reduce the number of attack surfaces used +by potential attackers. + +The term of Application (App) has a very wide definition in **AGL**. Almost +anything which is not in the core Operating System (OS) is an Application. +Applications can be included in the base software package (image) or can be +added at run-time. + +Application containment is achieved using the following protections: + +- Linux Native protection + - Mandatory Access Control (**MAC**) +- AGL Platform protections + - Origin Tracking and Validation + - Application Privilege Management and Enforcement via Cynara + - Authenticated Transport via D-Bus + +## Application Types + +AGL provides a framework for applications to be written in different forms: + +- Web application: HTML5 + JavaScript +- Qt application: in a QML file +- Native application: in C + +While there is no harm in providing multiple types of applications, from a +security perspective this does increase the attack surface for an intruder. +The application framework (**AppFw**) consists of a number of utilities and +daemons which provide context for the applications. +Isolation is provided through **SMACK** labels. + +## Application Store + +Although the Tizen system has defined a [system of App signing and signing flow](https://wiki.tizen.org/Security/Tizen_3.X_Overview#Application_Singing_and_Certificates) +to avoid the spread of unauthorized Apps that might contain malware. +At this point, it is unclear how much of this flow AGL will adopt. +However, judging from the experience, it is an essential topic. For example, +the Google Play Store controls the authorization of Apps through signing, and still, +there are [many accounts of Apps containing malware on the store](http://www.eweek.com/mobile/researchers-find-132-malware-infected-android-apps-on-google-play). + +Tizen defines 5 levels of certificates and signing at each level, including an author, +testing distributor, public level store distributor, partner level store distributor, +and platform level store distributor. AGL may define a different number of third parties, +but at a minimum an author and store distributor should be defined. + + + +Once the number of signatures has been established, verification of those signatures needs +to be done at a minimum at installation time on the AGL device. It is important to ensure +the robustness/integrity of the public key used for signature verification. If the public key is modified, +then this compromised key can be used to verify an attacker's private key signature. + +Further to this, installation-time verification is limited. Attacks can happen to apps in-memory +at runtime. Any modifications made after installation will be missed by installation-time verification. +Integrity verification that runs during execution makes for a more complete security story. + +-------------------------------------------------------------------------------- + +## Acronyms and Abbreviations + +The following table lists the terms utilized within this part of the document. + +Acronyms or Abbreviations | Description +------------------------- | ---------------------------------------------------- +_3GPP_ | **3**rd **G**eneration **P**artnership **P**roject +_CASB_ | **C**loud **A**ccess **S**ecurity **B**roker +_DAST_ | **D**ynamic **A**pplication **S**ecurity **T**esting +_DPI_ | **D**eep **P**acket **I**nspection +_IDS_ | **I**ntrusion **D**etection **S**ystems +_IPS_ | **I**ntrusion **P**revention **S**ystems +_IPSec_ | **I**nternet **P**rotocol **Sec**urity +_LSM_ | **L**inux **S**ecurity **M**odule +_MITM_ | **M**an **I**n **T**he **M**iddle +_OSI_ | **O**pen **S**ystems **I**nterconnection +_SATS_ | **S**tatic **A**pplication **S**ecurity **T**esting |