By Nikolay Elenkov
Ci sono quasi un miliardo di dispositivi Android in uso e ognuno è potenzialmente a rischio di violazione informatica, hacking ed make the most. Che piaccia o meno, le conoscenze fondamentali consistent with proteggere un machine basato su Android sono ancora appannaggio di pochi, mentre los angeles diffusione del sistema è ormai oltre phone e pill e riguarda anche television, automobili e dispositivi wearable in genere.
In questo testo l’autore esamina componenti e sottosistemi Android according to guidare verso una profonda e completa comprensione dei meccanismi interni di sicurezza. Viene illustrata l'architettura del sistema con un approccio bottom-up che capitolo dopo capitolo prende in considerazione temi come l'implementazione dei permessi, l. a. gestione delle applicazioni e l. a. firma del codice, l'integrazione di sistemi according to l. a. crittografia, l'amministrazione dei dispositivi e il controllo degli aggiornamenti. los angeles versione di riferimento è Android 4.4 (KitKat) il cui codice sorgente è oggetto di attenta analisi, ma non mancano riferimenti a caratteristiche delle versioni precedenti.
Argomenti in breve
Architettura e modello di sicurezza Android
Gestione dei permessi
Gestione dei package
Gestione degli utenti
Provider di crittografia
Sicurezza di rete e PKI
Archiviazione delle credenziali
Gestione degli account online
Protezione del dispositivo fisico
Comunicazioni NFC ed elementi sicuri
Integrazione di SELinux
Aggiornamenti di sistema e accesso di root
Read or Download Android : guida alla sicurezza per hacker e sviluppatori PDF
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Assegnazione degli attributi di processo Prima di vedere come il kernel e i servizi di sistema di livello inferiore verificano e applicano i permessi, è necessario esaminare il modo in cui vengono avviati i processi applicativi Android e come vengono loro assegnati gli attributi di processo. Come spiegato nel Capitolo 1, le applicazioni Android sono implementate in Java ed eseguite dalla Dalvik VM. Di conseguenza, ogni processo applicativo è in effetti un processo Dalvik VM che esegue il bytecode dell’applicazione.
Inoltre, a ogni applicazione viene assegnata una directory dati dedicata in cui può leggere e scrivere solo l’applicazione specifica. Le applicazioni sono quindi isolate, o in sandbox, sia a livello di processo (ognuna viene eseguita in un processo dedicato) sia a livello di file (ognuna ha una directory dati privata). Si crea così una sandbox delle applicazioni a livello di kernel, che si applica a tutte le applicazioni indipendentemente dalla modalità di esecuzione (processo nativo o di macchina virtuale).
1 Recupero di un elenco di tutti i permessi. permission. permission. launcher3). xml e possono definire nuovi permessi con il tag