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string PolicyRequest = new UTF8Encoding(). GetString(e.Buffer, 0, e.BytesTransferred); //check for valid format if (PolicyRequest.CompareTo(ValidPolicyRequest) == 0) //valid request-send policy SendPolicy(e.UserToken as Socket); } }); return ClientSocket.ReceiveAsync(sockEvtArgs); } private void SendPolicy(Socket ClientSocket) { //read the policy file FileStream fs = new FileStream("clientaccesspolicy.xml", FileMode.Open); byte[] PolicyBuffer = new byte[(int)fs.Length]; fs.Read(PolicyBuffer, 0, (int)fs.Length); fs.Close(); SocketAsyncEventArgs sockEvtArgs = new SocketAsyncEventArgs { UserToken = ClientSocket }; //send the policy sockEvtArgs.SetBuffer(PolicyBuffer, 0, PolicyBuffer.Length); sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>( delegate(object Sender, SocketAsyncEventArgs e) { //close this connection if (e.SocketError == SocketError.Success) (e.UserToken as Socket).Close(); }); ClientSocket.SendAsync(sockEvtArgs); } } } After a connection request is accepted by the policy server, it attempts to receive a policy request from the client and checks it for validity by comparing it to the string literal <policy-file-request/>. If valid, the policy file is read into memory and sent back to the client through the connected client socket. When the send is completed, the socket connection is closed, and the policy server keeps listening for more policy requests.

You need your Silverlight client to access resources or services in a domain different from the one from which it originated.

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Attacks where malicious code may make unauthorized calls to a remote services domain or flood the network with a large number of calls to effect denial of service are common threats on the Internet. To prevent this, Silverlight requires an explicit opt-in for a target remote domain to allow a Silverlight application to access network resources in that domain. The domain from which the Silverlight application is served is also called the site of origin, and a remote domain is any network location other than the site of origin. This opt-in is implemented by way of a policy file that is downloaded by the Silverlight runtime and evaluated for access permissions. The policy file is defined in an XML syntax and must be named clientaccesspolicy.xml. For HTTP-based communication (which includes the WebClient and the other HTTP communication classes, as well as the Silverlight WCF client proxy implementation), the owner of the target domain needs to place such a policy file at the root of the target site. When your Silverlight application makes the first HTTP request to the target domain in question, the Silverlight runtime tries to download the policy file from the site s root. If the download is successful, the runtime then evaluates the policy settings in the file to determine whether appropriate access has been granted to the resources being requested by the client application. On successful evaluation and the presence of appropriate permissions, the application is allowed to continue with the network call. Otherwise, the network call fails. Figure 7-8 shows the sequence of calls for cross-domain access over HTTP.

Figure 7-8. Call sequence for cross-domain access over HTTP Also note that Silverlight supports the Flash cross-domain access policy format as well. In the previous scenario, if a clientaccesspolicy.xml is not found, the runtime tries to download a Flash policy file named crossdomain.xml and base resource access on the policy specified there. For sockets-based communication, a similar policy file is used, but there are a few more details. For Silverlight applications using sockets, the cross-domain policy requirements apply to crossdomain calls as well as those back to the site of origin. On the first attempt to open a connection to a TCP endpoint from a Silverlight application, the runtime attempts to open another TCP connection to the target server (cross-domain or site of origin) at port 943. If this connection succeeds, the runtime then tries to download the policy file over this connection. If the download succeeds, the connection is closed and the downloaded policy file is used for the rest of the session. Figure 7-9 shows the sequence of calls for cross-domain access over TCP sockets.

<zscript> void go(String catid) { if (catid != null) { if ("BIGBIRDS".equals(catid)) catid = "BIRDS"; Executions.sendRedirect("catalog.zul catid="+catid+"#0"); } } </zscript>

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