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At this level, one needs a Symbian Signed account, a valid Publisher ID, the purchase of a Content ID, as well as a paid independent validation
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Application packages can be installed onto SymbianOS devices through several vectors namely MMS, Bluetooth, HTTP/S, IRdA, and USB tethering No matter the route, all installation is handled through the SWInstall process SWInstall acts as the gatekeeper for a SymbianOS device It has sufficient capabilities to access the necessary file system paths It validates all installation packages to ensure that they meet the signing requirements for the requested capabilities, that the binaries within the package have not been modified, and that the installer is not overwriting an existing application Validation occurs in several steps: To begin, SWInstall identifies the files to be installed (remembering that a single installation package can include binaries for multiple platforms) Then it enumerates the capabilities requested by the listed executable images (DLLs and EXEs) SWInstall proceeds to chain the signatures on the SIS file back to trusted SymbianOS code-signing CAs generally Symbian Signed or a device manufacturer Each CA may only certify particular capabilities If the set of requested capabilities is not a subset of the certifiable capabilities, then one of two things occurs If the requested capabilities are system level or higher, the installation will fail If the requested capabilities are user level, the device owner will be asked whether installation should continue SWInstall also ensures that the SID is unique on the phone, that installers with protected range SIDs are appropriately signed, and that a Vendor ID is only specified with signed applications After validation, SWInstall copies the contained resources to the required destinations Binaries are placed in \sys\bin, resources are written to \resource, and the associated private directories are determined from an applications SID The installer will also write files into the import directory of another executable (\private\<SID>\import) to allow for delivering data to other applications Installing into this import directory must happen at installation; most applications will not have the necessary capabilities to write to this directory When applications are installed to removable media, the SWInstall process will record the SHA-1 hash of the binaries to a private location on internal media This prevents an individual from installing an application, removing the media, and modifying the binary to increase capabilities Remember that capabilities are only checked against the signature at install time
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7: SymbianOS Security
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Symbian is a single-user operating system This makes sense considering the use case of a mobile phone A small embedded device that a single user carries with them on their person Because there is only one user, permissions must be enforced elsewhere There is no concept of a root user or an unprivileged user Rather, each process has an immutable set of capabilities indicating what actions the process is allowed to perform
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Twenty capabilities are defined within the Symbian platform These are maintained within a 64-bit-wide field in the executable image header, thus allowing for future expansion These capabilities can be divided into four categories: User, System, Restricted, and Manufacturer User capabilities are directly meaningful to the user of the mobile phone A mobile phone user is expected to be able to make reasonable decisions regarding these capabilities Users can grant untrusted applications (unsigned, self-signed, or not chained to a trust root) the ability to make use of these capabilities These are listed in Table 7-5 System capabilities may be of use to a wide variety of potential distributed applications However, they are not directly meaningful to end users What is the difference between SurroundingsDD and Location or UserEnvironment As such, these capabilities cannot be granted by a user to untrusted applications An installer must be signed through the Symbian Signed program Any of the available signing
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