Security of HTTP in Java

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1532 Security of HTTP
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Access to the HTTP connection may be restricted by device policy Trusted MIDlet suites request access with the javaxmicroeditionioConnectorhttp permission, as described in Section 183, "Trusted MIDlet Suite Security Model"
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The device may try to authorize the MIDlet when the MIDlet calls the Connectoropen method with a valid URL If
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154 Sample Code (NetClientMIDletjava)
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The following application, NetClientMIDlet, demonstrates how HTTP can be used to log in to a server, send data, and receive a response
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The MIDlet begins by displaying the instructional screen shown in the top figure If the user selects OK, the MIDlet sends a POST request that contains a user identifier and password for a basic authentication scheme It also sends the message Esse quam videri ("To be rather than to seem")
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After sending the message, the MIDlet reads the returned values A screen full of the values are shown in the next figure: a string identifying itself (such as "NetServer Servlet" as shown in the bottom figure), followed by a date string, the original POST message body, the message body reversed, and a complete list of headers read from the POST request (The figure only shows the first header)
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The example consists of three classes The NetClientMIDlet class extends the MIDlet class It implements the MIDlet life cycle methods and has the device display the screens shown in the figures The ConnectionManager class opens the HTTP connection to a server, sends the information, and reads the response The BasicAuth class transforms the user identifier and password into a base64 encoded string
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NetClientMIDletjava
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155 SocketConnection
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The SocketConnection interface extends interface javaxmicroeditionioStreamConnection to define the API to TCP/IP or similar socket streams (Refer to the documentation of interface StreamConnection on page 69) Applications that need to accept connections from other applications must use ServerSocketConnection instead See Section 156, "ServerSocketConnection" for more information
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An application opens a socket on a target host by calling the Connectoropen method The application must provide a URI string that starts with 'socket://' and is followed by a host name and port number separated by a colon For example, 'socket://hostcom:79' has the correct syntax to open a socket connection on the hostcom system at port 79
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In the string the MIDlet can specify the host as a fully qualified host name or IPv4 number Note that RFC1900 [ reference 2] recommends the use of host names rather than IP numbers Using the host name means the MIDlet can still make the connection, even if the host's IP number is reassigned For example, 'socket://hostcom:79' is preferred to 'socket://183206241133:79' If the connection string uses incorrect syntax, Connectoropen throws an IllegalArgumentException exception
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The Connectoropen method returns a SocketConnection instance It has methods that enable the MIDlet to get the local and remote addresses and the local and remote port numbers, and to control socket options
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1551 Getting the Local Address and Port Number
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An application can get the local host address and port number for an open connection (This information is needed primarily by applications that use a ServerSocketConnection to allow clients to make inbound connections to a system-assigned port See Section 156, "ServerSocketConnection" for more information) The getLocalAddress method returns the local IP number to which the socket is bound Calling SystemgetProperty("microeditionhostname") returns the host name of the device, if it is available The getLocalPort method returns the local port to which this socket is bound
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If an application sends address and port information to a remote application so that it can connect to the device, the application should try to send the host name of the device IP addresses can be dynamically assigned, so a remote application with only an IP address will not be able to make contact if the device IP number changes If a host name is available, sending it would help the remote application be more robust