Update slides

images/broker.svg

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images/dacl.svg

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slides.md

@@ -2,37 +2,47 @@
 % Alexandre Janniaux
 % 19 septembre 2018
 
-## Présentation du stage
-
-/!\\ A faire
-
 ## VideoLabs, VLC
 
-mettre logo videolabs
+<img src="images/videolabs.svg" alt="Logo videolabs" width="50%"/>
 
 ## Présentation de l'entreprise
 
 - Créée en 2012
 - Sponsorise le développement de VLC
 - Propose des prestations en :
-    - système embarqué
+    - systèmes embarqués
     - pipeline vidéo
     - multimédia en général
-- Composé d'une quinzaine d'employés
+- Composée d'une quinzaine d'employés
+
+## Présentation du stage
+
++ Principalement de la recherche (4 mois)
++ Utilisation d'une API d'encodage matériel
++ Optimisation d'un moteur de rendu pour la VR
++ Réalisation d'un prototype VLC multiprocessus
 
 ## Sandboxing
 
-Mettre image vlc-sandbox
+- Besoin d'isolation mémoire
+- Besoin de règles par processus
+- Besoin de définir les possibilités pour chaque bout de l'application
 
 ## Conteneurs
 
-flatpack, snap
+<img src="images/flatpak.png" alt="Flatpack">
+<img src="images/logo-baleine-docker.png" alt="Docker">
 
 ## Fined Grained sandboxing
 
-google chrome
+<img src="images/googlechrome.svg" alt="Google Chrome" width="40%">
 
-## Conception de la sandbox
+## Objectifs de la sandbox
+
+- être désactivable au démarrage
+- définir des zones de privilège et d'accès
+- ne pas réécrire les modules
 
 ## Mécanismes de sandboxing sous Linux
 
@@ -43,56 +53,228 @@ google chrome
 
 ## Mécanismes de sandboxing sous Windows
 
-## Architecture multiprocessus
+- Integrity level
+- AppContainer
+- DACL
+
+## Conception de la sandbox
+
+- Réalisation d'un prototype indépendant
+- Intégration dans VLC
+- Choix du modèle
+
+<aside class=notes>
+</aside>
+
+## Modèles de sandbox : orchestrateur
+
+<img src="images/orchestrateur.svg" alt="Orchestrateur">
+
+<aside class=notes>
++ Socket dédié pour chaque lien entre zone
++ Jetons d'accès
++ Moins d'appel système
+
+Mais
+
++ Croissance potentiellement quadratique du nombre de socket
++ Difficile à manipuler
++ Difficile à déboguer
+
+Exemple avec strace
+</aside>
+
+## Modèles de sandbox : broker
+
+<img src="images/broker.svg" alt="Orchestrateur">
+
+<aside class=notes>
++ droits d'accès plus fin, centralisés et personnalisables
++ point de contrôle pour les logs et le debogage
+
+mais
+
++ logique de contrôle et de routage
++ plus d'étape de changement de contexte
+
+</aside>
+
+## Premier prototype
+
+- Créer les processus
+- Établir la communication entre eux
+- Modèle orchestrateur
+<img src="images/Nginx_logo.svg" alt="Logo NGINX" width="50%">
+
+Manipulation de l'interface SCM et de la mémoire partagée
+
+## Modification des variables
+
+- Répartition de l'arbre de variables sur plusieurs processus
+- Très bon test pour la communication interprocessus
+- Devenu gênant dans la suite
 
-## Découpage du projet
+## Deadlock version 1
 
+<img src="images/deadlock_rpc_no_loop.svg" alt="">
 
-#
+## Intégration d'une boucle événementielle
 
-## Architecture de VLC
+<img src="images/eventloop.svg" alt="boucle événementielle">
 
-## Modules
+## Deadlock version 2
+
+<img src="images/deadlock_double_rpc.svg" alt="">
+
+<aside class=notes>
+    + impossible à régler sans concepts comme des futures et promesses
+    + vivre avec, éviter de faire des IPC dans des handlers d'IPC
+</aside>
+
+##
+
+<img src="images/sandboxing_cycle.png" alt="Sandbox cycle XKCD" width="60%">
+
+<aside class=notes>
+    + Ressemble beaucoup au XKCD
+</aside>
+
+## Objets proxy
+
+- un identifiant
+- `proxy_SendMsgReply(proxy, msg, &cookie)`
+
+<img src="images/proxy.svg" alt="Création de proxy">
+
+<aside class=notes>
+- nouvel objet proxy par downcasting et aggrégation
+</aside>
 
-Dessin libvlccore
 
 ## Description de l'API
 
+    /* Début du processus */
+    sandbox = vlc_sandbox_Init(&(const struct vlc_sandbox_cfg) {
+        /* parameters and policy */
+    });
+    
+    vlc_sandbox_Start(sandbox);
+
+<aside class=notes>
+</aside>
+
+## Démarrage des processus
+
+    /* vlc_sandbox_Init */
+    const char psz_zygote[] = "--sandbox-zygote=";
+    const char psz_worker[] = "--sandbox-worker=";
+    for(int i=0; i< cfg->argc; ++i)
+    {
+        if(!strncmp(cfg->argv[i], psz_zygote, strlen(psz_zygote)))
+        {
+            // it's a zygote
+        }
+        else if(!strncmp( cfg->argv[i], psz_worker, strlen(psz_worker)))
+        {
+            // it's a worker
+        }
+    }
+
 ## Architecture du projet
 
-## Paradigme proxy
+<aside class=notes>
+- On a fait la partie correspondant à la mise en place du cadre de sandboxing
+- Il faut revenir à VLC
+</aside>
 
 ## Méthode avec les modules de VLC
 
+- Pattern proxy
+- Générer de faux modules se comportant comme les vrais à IPC près
+
 ## Méthode avec les objets de libvlccore
 
+- Pattern strategy sur l'architecture de VLC
+- Implémenter le pattern proxy
+
+## Protocole de communication
+
+    ------------------------------------------------------------
+    | ID d'étage | ID de requête | ID de RPC | Paramètres  RPC |
+    ------------------------------------------------------------
+
++ À qui envoyer ?
++ Comment répondre ?
++ Que faire ?
+
 ## Passage de ressources entre processus
 
-## Conception et inscription dans VLC
+    block_t *block = block_Alloc(size);
+
++ Très peu flexible
++ Devrait être amené à changer pour Windows
+
+## Passage de ressources entre processus
+
+<img src="images/memoire.svg" alt="producteur-consommateur en mémoire partagée" width="100%">
+
+<aside class=notes>
+    Buffer multiplexé pour l'écriture de blocs
+</aside>
+
+## Passage de ressources sous Linux
+
+- On utilise `memfd_create` dans `block_Alloc`
+- Utilisation totalement transparente
+
+Mais plus coûteux que le modèle précédent
+
+## Limitations du travail actuel sous Windows
+
+## Gestion des ressources sous Windows
+
+    BOOL WINAPI DuplicateHandle(
+      _In_  HANDLE   hSourceProcessHandle,
+      _In_  HANDLE   hSourceHandle,
+      _In_  HANDLE   hTargetProcessHandle,
+      _Out_ LPHANDLE lpTargetHandle,
+      _In_  DWORD    dwDesiredAccess,
+      _In_  BOOL     bInheritHandle,
+      _In_  DWORD    dwOptions
+    );
+
+`SourceProcess` et `TargetProcess` doivent avoir `PROCESS_DUP_HANDLE`
+
+## Gestion des droits sous Windows : Jobs
 
-## Implémentation dans Linux
+- Gestion des limitations de ressources dans les processus
+- `JOB_OBJECT_ULIMIT_HANDLES`
+- `UserHandleGrantAccess`
 
-Parler des mécanismes d'héritage et socket unix
+Malheureusement...
 
-## Implémentation dans Windows
+## Gestion des droits sous Windows : Jobs
 
-Parler des mécanismes d'héritage et DuplicateHandle
+- Un user handle est un objet de l'interface, pas un objet système
+- Les jobs ne sont pas une fonctionnalité de sécurité
 
-## Création des processus
+On peut faire le parallèle entre les Jobs et cgroups, avec un esprit Windows (i.e. GUI)
 
-## ASLR ou exécution complète
+<aside class=notes>
+</aside>
 
-## Gestion de la boucle événementielle
+## Gestion des droits sous Windows : ACL
 
-## Mécanisme de lecture asynchrone
++ PACL, DACL, ACE, SecurityDescriptor, Tokens...
 
-Différents modèles de notification
+##
 
-- notification sur complétion d'une opération
-- notification sur disponibilité des objets
+<img src="images/dacl.svg" alt="Construction avec des ACL">
 
-## Implémentation sous Linux
+# Conclusion
 
-epoll
++ pattern reproductible
++ difficultés à déboguer
++ différences de paradigmes
 
-## Implémentation sous windows
+# Questions

template-revealjs.html

@@ -3,7 +3,7 @@
 <head>
 <meta charset="utf-8">
 
-<title>$title$</title>
+<title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
 
 <meta name="description" content="$title$">
 
@@ -91,6 +91,7 @@ $body$
     progress: true,
     history: true,
     center: false,
+    slideNumber: true,
 
   // available themes are in /css/theme
   $if(theme)$

todolist

@@ -2,24 +2,79 @@
 
 - [ ] Présentation
 - [ ] VideoLabs
+
+// 2 min ici
+
 - [ ] Sandboxing 
     - Expliquer qu'il s'agit de multiprocessing mais avec un esprit de sandboxing derriere
     - [ ] Explication graphique sandboxing
+        - [ ] Flatpack, docker
     - [ ] Explication graphique fined grained sandboxing
-    - [ ] 
+        - [ ] séparation en plusieurs partie
+        - [ ] google chrome
+        - [ ] XKCD => ne pas intégrer la comm comme une feature, transparence
+    - [ ] Mécanismes de sandboxing
+        - [ ] linux capabilities
+        - [ ] seccomp
+        - [ ] linux namespace
+        - [ ] cgroups
+        - [ ] integrity level
+        - [ ] lowbox token
+        - [ ] AppContainer
+        - [ ] PACL
+
+// 5 min
+
 - [ ] Conception
     - Expliquer que je vais détailler les différentes parties 
-    - [ ] Mécanismes de sandboxing
+    - [ ] Objectifs
     - [ ] Présentation du projet / découpage
+
+// 2 min
+
+- [ ] Réalisation du proto-ipc en orchestrateur
+    - [ ] Création des processus
+    - [ ] Passage de ressources entre processus
+
+// 4 min
+
+- [ ] Réécriture des variables
+    - [ ] Pattern proxy
+    - [ ] Boucle événementielle pour éviter les blocages
+    - [ ] Toujours des blocages
+
+// 6 min
+
+- [ ] Injection de la sandbox dans l'architecture
+    - [ ] Création du décodeur
+    - [ ] Création des objets proxy
+    - [ ] Création du lien entre les processus
+
+- [ ] Conversion entre broker et orchestrateur
+
+// 6 min
+
 - [ ] Présentation de l'API
     - [ ] Architecture du projet
-    - [ ] Proxy
     - [ ] Methode entre libvlccore et modules
-- [ ] Passage de ressources entre processus
-- [ ] Création des processus
-- [ ] Boucle événementielle
+
+- [ ] Démonstration
 
 ? Séparer par theme plutot que par implémentation ? => permet de tout décrire 
 => expliquer des mécanismes de software engineering qui permettent cette transformation
 
 => bien expliquer les limitations 
+
+
++ objet libvlc
++ libvlccore/libvlc : placement de la partie sandbox
++ ASLR, fork, déplacer dans description de l'API cliente
++ architecture proxy : plus de maniabilité, peut être retravaillée plus tard (pas de changement d'interface)
++ architecture proxy : pattern strategy aussi
++ Politiques de sandboxing
+
++ présentation du PoC seccomp et mise en parallèle
++ écriture du PoC pour tester les concepts (windows, linux)
++ écriture des premiers points
+
++ parler lien