Download E-books Android Security Internals: An In-Depth Guide to Android's Security Architecture PDF

By Nikolay Elenkov

"I in truth did not think i would research a lot from the e-book simply because i have been engaged on Android defense for a few years. This trust couldn't were extra fallacious. Android protection Internals has earned an everlasting spot on my place of work bookshelf."—Jon "jcase" Sawyer, from the Foreword

There are multiple billion Android units in use this present day, each a possible goal. regrettably, many primary Android safety features were little greater than a black field to all however the so much elite safety professionals—until now.

In Android protection Internals, most sensible Android protection professional Nikolay Elenkov takes us less than the hood of the Android protection process. Elenkov describes Android safety structure from the ground up, delving into the implementation of significant security-related elements and subsystems, like Binder IPC, permissions, cryptographic services, and machine administration.

You'll learn:

  • How Android permissions are declared, used, and enforced
  • How Android manages software programs and employs code signing to make sure their authenticity
  • How Android implements the Java Cryptography structure (JCA) and Java safe Socket Extension (JSSE) frameworks
  • About Android's credential garage method and APIs, which enable purposes shop cryptographic keys securely
  • About the web account administration framework and the way Google money owed combine with Android
  • About the implementation of established boot, disk encryption, lockscreen, and different equipment protection features
  • How Android's bootloader and restoration OS are used to accomplish complete method updates, and the way to acquire root access

With its unparalleled point of intensity and element, Android safety Internals is a must have for any security-minded Android developer.

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Right here, imposing is both real or fake and is by way of an inventory of SPKI SHA-512 hashes separated through commas. notice that there's no validity interval, so pins are legitimate till deleted. The dossier is used not just through the browser, yet system-wide through advantage of pinning being built-in in libcore. In perform, which means the default (and basically) procedure X509TrustManager implementation (TrustManagerImpl) consults the pin record whilst validating certificates chains. yet there’s a twist: the traditional checkServerTrusted() technique doesn’t seek advice the pin record. therefore, any legacy libraries that don't find out about certificates pinning could proceed to operate precisely as earlier than, whatever the contents of the pin checklist. This has most likely been performed for compatibility purposes and is whatever to pay attention to: operating on Android four. 2 or above doesn’t inevitably suggest that you just get the good thing about system-level certificates pins. The pinning performance is uncovered to third-party libraries and apps through the hot X509TrustManagerExtensions SDK category. It has a unmarried technique, checkServerTrusted() (full signature proven in instance 6-11) that returns a established chain on good fortune or throws a CertificateException if validation fails. instance 6-11. X509TrustManagerExtensions certificates validation strategy List checkServerTrusted(X509Certificate[] chain, String authType, String host) The final parameter, host, is what the underlying implementation (TrustManagerImpl) makes use of to go looking the pin checklist for matching pins. If one is located, the general public keys within the chain being verified could be checked opposed to the hashes within the pin access for that host. If none suits, validation will fail and you'll get a CertificateException. What a part of the approach makes use of the recent pinning performance then? The default SSL engine (JSSE provider), specifically the customer handshake (ClientHandshakeImpl), and SSL socket (OpenSSLSocketImpl) implementations cost their underlying X509TrustManager and if it helps pinning, they practice extra validation opposed to the pin checklist. If validation fails, the relationship won’t be demonstrated, hence imposing pin validation at the TLS layer as required by way of the factors mentioned within the past part. The pins dossier isn't written at once by way of the OS. Its updates are caused by means of a published (android. rationale. motion. UPDATE_PINS) that includes the hot pins in its extras. The extras comprise the trail to the recent pins dossier, its re-creation (stored in /data/misc/keychain/metadata/version/), a hash of the present pins, and a SHA512withRSA signature over all of the above. The receiver of the printed (CertPinInstallReceiver) then verifies the model, hash, and signature, and if legitimate, atomically replaces the present pins dossier with new content material (the similar approach is used for updating the top rate SMS numbers list). Signing the recent pins guarantees that they could basically by means of up to date via whoever controls the non-public signing key. The corresponding public key used for validation is kept as a procedure safe surroundings lower than the config_update_certificate key (usually within the safe desk of the /data/data/com.

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