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Link Time Verification When the COD is loaded onto the BlackBerry, it is linked with the platform APIs If the COD file links against any RIM Controlled APIs and does not have an appropriate signature, then the linker refuses to link the binary The application will still be loaded onto the device, but will fail immediately upon startup (see Figure 5-2)
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Figure 5-2
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Error displayed when loading an unsigned application that uses RIM Controlled APIs
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5: BlackBerry Security
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Run Time Verification Checks are performed whenever the application invokes a RIM Controlled API These checks prevent malicious code, or legitimate code that has been exploited, from accessing RIM Controlled APIs or bypassing the application permissions system The combination of verified Java code, code integrity, and per-API access control is powerful for security These mechanisms enable sandboxed applications and enable users to control how those applications use data on the device Before getting too excited about the BlackBerry s signature-based security architecture, remember that code-signing certificates are cheap and do not require an extensive authentication process Requiring signatures increases accountability and enables code integrity, but a signature does not guarantee the signed code is well written or nonmalicious The only foolproof mechanism to avoid malware is to avoid installing third-party applications altogether Signatures are required for at least one class contained within each of the following RIM packages:
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Signing BlackBerry Applications
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BlackBerry signatures use public key cryptography and a RIM-managed online signing service To sign code, developers must have a public/private keypair and
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Mobile Application Security
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have registered that keypair with RIM The following step-by-step guide describes how to get RIM signing keys and what happens along the way:
1 Go to RIM s code signing website (wwwblackberrycom/go/codesigning) 2 Hidden on the web page is a small link to an order form for requesting keys
3 Fill out the form and provide payment information As part of this registration
process, a PIN will be required This PIN is essentially a password for the user account and will be used by the signing authority to associate cryptographic keys with the account
4 After the form is submitted, a few days will pass while RIM processes your order
Assuming that everything is acceptable, the signing infrastructure will send three e-mails one for each of the RCR, RRT, and RBB signing authorities
5 Attached are CSI files These are text files that include the developer ID, the
nickname of the signing authority (for example, RCR), and the URL for the signing web service If the JDE is installed, CSI files are automatically associated with RIM s Signature Tool Double-clicking on the CSI file will launch the Signature Tool and start the key-registration process These CSI files don t really have any key material in them and are used to tell the Signature Tool about the signing authorities that exist
6 Once the Signature Tool opens the CSI file, it checks to see if the developer
already has a public/private keypair If not, the developer will be asked whether they want to generate one This is pretty fun, because RIM makes you move the mouse and pound the keyboard to collect entropy At the end of the generation process, a password is required This is used to encrypt the keypair and protect it on disk
7 Once the public/private keypair is generated, the signature tool asks for your RIM
signing authority PIN
8 The PIN and the public key are used to create a message that is then sent via HTTP
POST to RIM s signing authority servers This message contains the public key, the developer s signing authority ID, and cryptographic data to ensure the message s integrity The curious can watch these messages in Wireshark The server records the relationship between the user ID and the public key This way, RIM does not need to generate the private key directly The same public/private keypair can be registered with all three signing authorities
9 Steps 5 8 must be repeated for each CSI file until all signing authorities are
5: BlackBerry Security
Getting signing keys is the first step in creating RIM signed applications To actually sign code, use the RIM Signature Tool, which is bundled with the JDE and Eclipse plug-in To run the tool from Eclipse, build the application and then select Request Signatures from the BlackBerry menu This will launch the Signature Tool with the currently selected project already loaded, as shown next If you re not using the Eclipse plug-in, the Signature Tool can be launched as SignatureTooljar from the JDE s bin directory The COD file will have to be loaded manually To do so, click the Add button and browse to the COD file
An individual application may not necessitate code signatures from every signing authority For example, if the application does not use cryptography, then a RIM Cryptographic Runtime (RCR) signature is not required The Signature Tool inspects the application and determines which keys are required To request signatures from the required signing authorities, click the Request button and enter the private key s password Behind the scenes, the private key is used to create a digital signature of the application, which is then sent via HTTP POST to the appropriate signing authorities If they accept the signature, they will sign the response and return a signature of the signature The Signature Tool adds this to the COD file By being online, RIM is able to monitor the signing process and control the number of times an individual signing key may be used RIM can also respond to compromise and refuse signatures if a key is known to be compromised Every time a signature is requested, an e-mail will be sent to the signature key s owner summarizing what was signed and who signed it This e-mail also contains the number of signatures remaining Standard developer keys may be used a little over two billion times
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