java barcode reader library open source 4: Windows Mobile Security in Android

Generating Data Matrix ECC200 in Android 4: Windows Mobile Security

4: Windows Mobile Security
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node called a key Each node can have multiple named values There are several possible data types for values, and they are what hold the actual configuration data The tree s root nodes are hives The two main hives are HKEY_LOCAL_MACHINE (HKLM) and HKEY_CURRENT_USER (HKCU) HKLM holds device-wide configuration, and HKCU holds user-specific information It doesn t make much sense to have HKCU on a Windows Mobile device because there is only one user; still, it exists The entire registry is readable by all applications, so it is not possible to hide data within the registry However, certain locations can only be updated by Privileged processes These locations include device configuration information that either mobile operators don t want users to update or that could be leveraged by malicious applications to elevate to Privileged level For example, certificate stores are in the registry and should not be updated by applications running at the Normal privilege level The write permissions on the registry keys are checked when the application calls one of the update registry APIs: RegSetValueEx, RegCreateKeyEx, RegDeleteKey, or RegDeleteValue The following keys are only accessible when running at Privileged level: Registry Keys
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Contains common configuration information for the device The communication components are configured here Also contains the certificate stores Configuration information for drivers Each driver has a unique node containing its settings Blocked from Normal processes because misconfigured drivers would compromise the security of the device Used as a lookup for drivers implementing a certain device class (for example, the touchscreen driver) Device initialization information Used to get the device up and running Contains the path to the registry file; overwriting this would lead to loading of malicious registry data Configuration information for long-lived services that run on the device System-wide configuration information related to the base OS Windows Driver Model (WDM) drivers These drivers conform to the WDM conventions that outline how to write compatible drivers Security-related policies that define the privilege levels and security components, such as certificate enrollment policies Security policies specific to this user Configures the device loader
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HKLM\Services HKLM\SYSTEM HKLM\WDMDrivers
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Stolen Device Protections
As mentioned earlier, Windows Mobile devices can be locked with a PIN that, if misentered, will cause the device to wipe itself Any data on removable storage cards will not be wiped Windows Mobile 6 adds support for encrypting data on removable storage cards; this feature is covered in more detail later in this chapter Enterprise device administrators can also wipe data remotely by pushing out policy through Exchange When the device syncs, it will receive the wipe policy and delete all non-storage card data
Structured Storage
Windows Mobile 6 includes Microsoft Compact SQL Server 35 as part of the OS ROM image Compact SQL Server is a full relational database engine and is file based (SDF files) Users connect to the database using a standard SQL connection string, and the database is manageable using SQL Management Studio SQL Server 35 supports password-based database encryption and integrity protection The entire database file is encrypted using AES 128 and integrity protected using SHA-1 To enable encryption, include Password=password in the database connection string The responsibility for managing the password is placed on the application developer, and the encryption option must be specified at database creation time
Encrypted and Device Secured Storage
Windows Mobile does not support encryption of the entire device However, encryption of removable storage cards is supported starting in Windows Mobile 6 Protection of on-device data is provided by prohibiting access to the device unless the proper unlock code is specified All data is wiped from the device when a hard reset or cold boot is performed, which is the only way to bypass the PIN Therefore, the data is protected while the device is running An attacker could hack the hardware to gain access to in-memory data, a sophisticated attack which is not currently mitigated Encryption of removable cards works by generating a key and storing that key in memory using the Data Protection API (DPAPI), a technology that will be discussed shortly The key is erased upon hard reset, and the card is only usable in that particular device The encryption algorithm used by default is AES 128, although RC4 may be used as well When files are transferred to a desktop PC from the device, they are decrypted before transfer
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