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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-1293DE8C-E803-4ADF-9FA8-862519337331" xml:lang="en"><title>Software

    13 installer</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>End users can install new software from a variety of sources: through

    15 e-mail, Internet downloads, multimedia messaging service (MMS) and WAP push

    16 messages, infrared and Bluetooth connections, PC Suite, and removable memory

    17 cards. The diversity of software vendors and delivery channels requires a

    18 sophisticated system for managing installed software.</p>

    19 <p>The Symbian <i>Software Installer</i> uses <i>digital signatures</i> and <i>certificates</i> to

    20 authenticate that the application being installed on a mobile device is from

    21 a known vendor. The signature can be obtained through the <xref href="https://www.symbiansigned.com/app/page" scope="external">Symbian

    22 Signed</xref> process, and the default certificates installed in the mobile

    23 device act as root certificates. During installation the signature is validated

    24 against the certificates. If they match, the application is installed and

    25 the requested <xref href="GUID-6971B0A2-F79B-4E05-8AF3-BB1FC1932A22.dita">capabilities</xref> are

    26 stored in the executable, assuming that the root certificate can grant the

    27 capabilities. Only <i>user capabilities</i> can be granted to unsigned or

    28 self-signed applications, and these are always confirmed by the user. </p>

    29 <note>

    30 <p>The end users have an option to cancel the installation if they detect

    31 that the vendor of the software package and certificate authority are not

    32 trustworthy. This is especially important when installing security-related

    33 components (for example, VPN clients, firewalls and virus scanners) or other

    34 business-related software.</p>

    35 </note>

    36 <p>The Software Installer ensures that no two applications have the same <xref href="GUID-3B6E25F7-C1A8-461F-97F7-421DB559BC98.dita#GUID-3B6E25F7-C1A8-461F-97F7-421DB559BC98/GUID-EEC50FC0-46D5-4ED7-AD95-67430D5EC652">SID</xref> value

    37 on a particular target device. The Software Installer has the <codeph>TCB</codeph> capability

    38 to read and modify content in the <xref href="GUID-B9414AE8-820E-4CA5-A9C4-29560CD6F2EF.dita"><codeph>\sys</codeph> </xref> folder

    39 and all its subfolders, which means that you can write to third-party application

    40 executables in the <codeph>\sys\bin</codeph> folder when they are installed

    41 through the Software Installer.</p>

    42 <p>For more information on the Software Installer, see <xref href="GUID-8E160B29-18C4-574B-9259-9A8E958CDA91.dita">Secure

    43 Software Install Tools</xref>.</p>

    44 <p>The following figure illustrates the steps of software installation:</p>

    45 <fig id="GUID-98820420-7C7A-46EC-9DE4-EA3F5FFD39A8"><title>Installation process for signed packages</title><image href="GUID-85291DF3-C134-4231-938A-C20DD122AB7D_d0e11153_href.png"/></fig>

    46 <p>The Software Installer can install the following types of packages:</p>

    47 <ul>

    48 <li><p>signed <codeph>sis</codeph> packages</p></li>

    49 <li><p>Java archives (JAR) run by a Java virtual machine</p>

    50 </li>

    51 <li><p>Web Runtime widgets</p></li>

    52 </ul>

    53 <p>The Software Installer recognizes different devices, which allows you

    54 to define the platforms and devices to which the software can be installed.</p>

    55 

    56 <p>If you receive an error message when using the Software Installer, see <xref href="http://developer.symbian.org/wiki/index.php/Troubleshooting_Installation_Errors.dita">Troubleshooting

    57 Installation Errors</xref> at the Symbian Foundation.</p>

    58 </conbody></concept>