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The web services architecture consists of three major components: Service provider Service requestor Universal Description, Discovery, and Integration (UDDI) registry The first two components are mandatory. Use of the UDDI registry is optional. The service provider creates a service and publishes it for the use of others. The service requestor requests the service from the service provider and consumes it. The UDDI registry makes available a list of services for service consumers to find. If a service requestor is aware of an existing service, it does not need to use the registry to locate the service. The service registry stores the references to service descriptions, namely WSDL documents. WSDL is discussed later in this chapter. Let s now consider the purpose of each component by walking through the sequence of operations as illustrated in Figure 3-3.

In a similar vein, any file that begins with a dot (.) on Unix servers is probably not intended for user consumption. This includes .htaccess files and user account files such as .cshrc, .login, .history, and .profile. This is the easy way to prevent users seeing these files:

The following example of a Perl script demonstrates how easy it is to create a major security hole with little effort:

#!/usr/bin/perl print "Content-Type: text/html\n\n"; $MAILTO = $ENV{'QUERY_STRING'}; $MAILTO =~ s/\+/ /g; # 'convert pluses to spaces print "<html><head><title>Test</title></head>"; print "<body><h1>Mail sent!</h1></body></html>"; open (MAIL,"|mail $MAILTO"); print MAIL "Hello Email World!\n"; close MAIL;

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xmlreq = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e1) { // Failed to create required ActiveXObject try { // Try version supported by older versions // of Internet Explorer xmlreq = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e2) { // Unable to create an XMLHttpRequest by any means xmlreq = false; } } } return xmlreq; } /* * Returns a function that waits for the specified XMLHttpRequest * to complete, then passes it XML response to the given handler function. * req - The XMLHttpRequest whose state is changing * responseXmlHandler - Function to pass the XML response to */ function getReadyStateHandler(req, responseXmlHandler) { // Return an anonymous function that listens to the XMLHttpRequest instance return function () { // If the request's status is "complete" if (req.readyState == 4) { // Check that we received a successful response from the server if (req.status == 200) { // Pass the XML payload of the response to the handler function. responseXmlHandler(req.responseXML); } else { // An HTTP problem has occurred alert("HTTP error "+req.status+": "+req.statusText); } } } }

This script seems innocuous enough; it receives input from the user, probably via a form, which is relayed to the script by Apache with the QUERY_STRING environment variable. The + signs are converted to spaces because this is how HTML forms encode spaces. The script then opens a connection to the mail system with the contained addresses and sends them a friendly message. There are two problems with this script, both concerning the way it calls the mail program. This script should properly be called with one or several e-mail addresses as arguments, for example:

The following operations take place in the specified sequence throughout the life cycle of a web service, from creation to consumption: 1. Creating the service 2. Publishing the service 3. Locating the service 4. Obtaining the service description 5. Binding the service 6. Invoking the service Each of these operations is explained in detail next.

6

But the CGI script could also encounter the following QUERY_STRING:

This would result in the following call:

function search(searchKey) { var form = document.forms[0]; var keyValue = document.getElementById("getCities").value; keyValue = keyValue.replace(/^\s*|\s*$/g,""); if (keyValue.length > 1) { availableSelectList = document.getElementById("searchResult");

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