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The WS-Secure Conversation specification allows Web services and clients to establish a token-based secure conversation for the duration of a session It is analogous to the SSL protocol that provides on-demand secure communications over the HTTP transport channel Secure conversations are essentially an efficiency mechanism to optimize the secure communication between a service and a client after the initial exchange of security credentials is over; this is known as the handshake Secure conversations reduce the need for frequent authentication between client and service In previous chapters, you saw how the WS-Security and WS-Policy family of specifications combine to provide a comprehensive approach to securing Web services Together these specifications provide an assortment of security options, including digital signatures, encryption algorithms, and custom authorization schemes We discussed these technologies in the context of protective security, meaning that they protect messages in transit and keep unwanted eyes from discovering sensitive information.

Clearly, this is a lot of additional overhead for the Web service to handle, compared to delivering an unsecured response. But keep in mind that encryption-based security generally creates less overhead compared to other types of binary tokens, such as UsernameToken security tokens, because less code is required on the client and Web service combined. And if your Web service implements a WS-Policy framework, then you will need to write even less code. (WS-Policy is the subject of 7.) Listing 6-13 shows the code that is required to accomplish Steps 1 through 4 listed previously. Listing 6-13. Encrypt a SOAP Response Message Based on the Certificate Used to Digitally Sign the Incoming SOAP Request Message

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Thus, if on some line in the /etc/hosts file, the system name stored in the node variable is in field 2, then the third field of that line will be displayed. When I run this command after setting the shell variable $node to casper, the output is the third field of the /etc/ hosts entry for casper: casper.mydomain.com.

using System.Web.Services.Protocols; using System.Web.Services.Description; using System.Xml.Serialization; using Microsoft.Web.Services2; using Microsoft.Web.Services2.Security; using Microsoft.Web.Services2.Security.Tokens; using Microsoft.Web.Services2.Security.X509; using System.Security.Permissions; using StockTraderTypes; [WebMethod()] public Quote RequestQuote(string Symbol) { SoapContext requestContext = RequestSoapContext.Current; SoapContext responseContext = ResponseSoapContext.Current; // Get the signing certificate X509SecurityToken token = GetEncryptionToken(requestContext); if( token != null ) { // Encrypt the response with the key in the request. responseContext.Security.Elements.Add( new EncryptedData( token ) ); } else { throw new ApplicationException("Unable to retrieve the encrypting certificate." ); }

This is certainly an important application of these technologies and it needs no further explanation But for the purpose of this chapter, we need to expand the context within which to view these technologies They are no longer needed just for protective security; in a broader context, they are needed for establishing trusted communications In the discussions so far, we have made the big assumption that the client and the Web service automatically trust each other By this, we mean the assumption that they both have an equivalent confidence in the integrity of the security tokens they are using to sign, encrypt, and otherwise secure their communications For example, if a client and a Web service agree to encrypt their messages using a digital X.

Displaying a Range of Fields (Main Method)

// Step 2: Create a new Quote object, but only populate if signature is valid Quote q = new Quote(); // Generate the quote (code not shown) } return q; // Return a Quote object } private X509SecurityToken GetEncryptionToken(SoapContext requestContext) { X509SecurityToken x509token = null; // Look for a digital signature, which contains the token that the Web Service // will use for encrypting the response if ( requestContext.Security.Tokens.Count > 0 ) { // // Check for a Signature that signed the soap Body and uses an x509 token. // foreach ( ISecurityElement element in requestContext.Security.Elements ) { MessageSignature signature = element as MessageSignature; // The signature we seek signed the soap Body if ( signature != null && (signature.SignatureOptions & SignatureOptions.IncludeSoapBody) != 0 ) { x509token = signature.SigningToken as X509SecurityToken; if ( x509token != null ) { // Return the certificate for encrypting the response // if it is capable of encryption X509Certificate cert = x509token.Certificate; if ( !cert.SupportsDataEncryption ) { // return x509token; // Reset x509token to null, so it does not get used x509token = null; } } } } } return x509token; }

Usually, printing a range of fields from an input line cannot be expressed using simple syntax. Unless the range is fixed, you generally need to have awk loop through a previously specified list of fields, printing each one in turn. In this example, the for loop starts with a fixed field number (here, 3) and ends with the value of the NF variable. You can modify this

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