Android : guida alla sicurezza per hacker e sviluppatori by Nikolay Elenkov

By Nikolay Elenkov

Ci sono quasi un miliardo di dispositivi Android in uso e ognuno è potenzialmente a rischio di violazione informatica, hacking ed take advantage of. Che piaccia o meno, le conoscenze fondamentali according to proteggere un gadget basato su Android sono ancora appannaggio di pochi, mentre los angeles diffusione del sistema è ormai oltre cellphone e pill e riguarda anche television, automobili e dispositivi wearable in genere.

In questo testo l’autore esamina componenti e sottosistemi Android in line with 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, los angeles gestione delle applicazioni e los angeles firma del codice, l'integrazione di sistemi in keeping with 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
Sicurezza enterprise
Protezione del dispositivo fisico
Comunicazioni NFC ed elementi sicuri
Integrazione di SELinux
Aggiornamenti di sistema e accesso di root

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Additional resources for Android : guida alla sicurezza per hacker e sviluppatori

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Ly/1nX6vCm). I permessi supplementari, detti permessi personalizzati, possono essere definiti sia dal sistema sia dalle applicazioni installate dall’utente. 1). Per visualizzare ulteriori informazioni sui permessi, compresi il package di definizione, l’etichetta, la descrizione e il livello di protezione, è sufficiente aggiungere il parametro -f al comando. 1 Recupero di un elenco di tutti i permessi. permission. permission. launcher3). xml e possono definire nuovi permessi con il tag .

Come spiegato nel paragrafo “Binder” di questo capitolo, il driver del kernel Binder garantisce che l’UID e il PID dei chiamanti non possano essere falsificati; molti servizi di sistema fanno affidamento su UID e PID forniti da Binder per controllare dinamicamente l’accesso alle API sensibili esposte tramite IPC. 7, il servizio di sistema Bluetooth Manager consente alle applicazioni di sistema di eseguire Bluetooth senza interventi manuali se il chiamante è in esecuzione con l’UID system (1000).

La policy può essere modificata solamente da un amministratore; gli utenti non possono sostituirla o ignorarla, per esempio per concedere l’accesso illimitato ai propri file. Security Enhanced Linux (SELinux) è un’implementazione di MAC per il kernel Linux che è stata integrata nel kernel mainline per oltre dieci anni. org/), migliorata per supportare le funzionalità specifiche per Android come Binder. In Android, SELinux è usato per isolare i daemon del sistema core e le applicazioni utente in diversi domini di protezione e per definire policy di accesso diverse per ogni dominio.

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