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Application Permissions)
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2 Select the application you want to control permissions for 3 Click the BlackBerry key and choose Edit Permissions The overall device
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permissions can be changed by opening this menu and selecting Edit Default Permissions The default permissions will be applied when an explicit permission definition for an application does not exist
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4 Choose the corresponding permission and set it to Enable/Disable/Prompt If
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Prompt is chosen, you will be shown a prompt the first time the application uses a controlled API that requires the corresponding permission The BlackBerry will remember your choice and not show the prompt again unless the permission policy is changed back to Prompt
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5 If a permission is changed to be more restrictive, the device may reboot to
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The BlackBerry s file system is a virtualized view of flash memory and external media cards Data is saved on the file system using the MIDP2 record store or IOConnector classes, or RIM s proprietary PersistentObject interface The file system is relatively flat, but there are security rules as to which areas of the system signed and unsigned applications can read from and write to For the security nut, almost everything can be encrypted using the BlackBerry locking password
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Mobile Application Security
Files and Permissions
The BlackBerry OS s file system is laid out somewhat like a traditional Unix file system, with the exception that there is no root directory File: URLs are used for referring to individual files, and URLs must contain the physical storage location For example, file:///store/home/user/pictures/pretty_picturepng references an image file within the user s home directory on the device s internal storage, also known as store Other storage locations include SDCard and CFCard The BlackBerry implements simple file-access restrictions, and not all files are readable or writable by all applications For example, unsigned applications can write files under the file:///store/home/user directory but not under the operating system location file:///store/samples To explore the file system, download and install BBFileScout from http://bbemacf1com/bbfilescouthtml BBFileScout is a donation-supported application for browsing the file system and performing basic management tasks, including copying, deleting, and moving files Because BBFileScout is signed, it provides a lot of information about what signed applications are able to do on the file system
Programmatic File System Access
BlackBerry Java applications use the javaxmicroeditioniofileFileConnection API to directly access the file system For security reasons, some file locations are inaccessible by this API, including application private data, system directories and configuration files, and RMS application databases (http://wwwblackberry com/developers/docs/470api/javax/microedition/io/file/FileConnectionhtml) Unsigned applications can browse the file system, but the user will be prompted each time the application accesses the file system To test the ability to read and write individual files, use the following sample code:
try { String fileURL = file:///store/home/user/pictures/my_picpng ; FileConnection fileConn = (FileConnection)Connectoropen(fileURLs[i]); // If no exception is thrown, then the URI is valid, // but the file may or may not exist if (!fileConnexists()) { Systemoutprintln( File does not exist ); fileConncreate(); // create the file if it doesn t exist Systemoutprintln( Was able to create file ); } else {
5: BlackBerry Security
Systemoutprintln( File exists ); if (fileConncanRead()) { Systemoutprintln( File is readable ); } if (fileConncanWrite()) { Systemoutprintln( File is writable ); } } fileConnclose(); } catch (IOException ioe) { Systemoutprintln(ioegetMessage()); }
Structured Storage
The BlackBerry OS provides three forms of structured storage: MIDP2 RecordStores (aka RMS databases) and RIM s proprietary PersistentStore and RuntimeStore RMS databases have the advantage of being MIDP2 platform compatible and usable by unsigned applications The downside is that they can only store 64KB of data per store and require the application to manually marshal objects to and from byte arrays Pretty archaic, but still useful To program RMS, use the javaxmicroedition rmsRecordStore class Each RecordStore is named with a unique identifier that must be local to the MIDlet suite, but does not have to be unique to all applications on the device On other MIDP2 platforms, you can share RMS databases between applications by publishing a RecordStore with a well-known name The BlackBerry only allows sharing between the same MIDlet suite To share data between applications, store more data, and not have to worry about byte array serialization, use RIM s PersistentStore or RuntimeStore classes These are RIM Controlled APIs The PersistentStore is stored in flash memory, but the RuntimeStore lives in RAM and will be erased when the device resets To use the PersistentStore, classes must implement the netrimdeviceapiutilPersistable interface, which describes any special serialization actions required Objects are uniquely identified using a data identifier that is stored as a JME type long By default, objects are readable to anyone who knows the object s data identifier To keep objects private, wrap them in a ControlledAccess access object and associate a CodeSigningKey with the wrapped object Only applications signed with the public key represented by the CodeSigningKey will be allowed to access the persisted object
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