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The next level of security above the transport level is message-level security, where the security protections are provided by the WS-Security framework and associated specifications The WS-Security framework defines SOAP headers that include the necessary information to protect messages The WS-Security specification defines the security header for SOAP messages and what can be included within the header Associated specifications define the contents of the SOAP security header and the processing rules associated with those contents Because Web services expose access to programs and data stores, their use creates additional requirements for security protection Furthermore, complex Web services may span multiple network locations discovered dynamically or composed into a larger interaction such as a process flow Web services need an end-to-end security model for the entire conversation because sensitive information could be passed from service to service A Web service interaction also may potentially involve multiple parties using different security-related technologies
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The WS-Security Framework
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WS-Security (Web Services Security) is the name of a set of specifications[3] that augment SOAP message headers to incorporate solutions to many common security threats, in particular those related to the requirements of Web services messaging [3] See http://wwwoasis-openorg/committees/tc_homephp wg_abbrev=wss Because SOAP is a particular form of an XML document designed for messaging and interoperability, WS-Security needs to define how XML Encryption and XML Signature should be used with SOAPthis is one of the major motivations for WS-Security The WS-Security specifications protect against: Message alteration By including digital signatures for all or parts of the SOAP body and the SOAP header Message disclosure By supporting message encryption The WS-Security framework can also be used to: Preserve message integrity through the use of strong key algorithms Authenticate messages through the use of various token mechanisms such as Kerberos and X509 The specifications are divided between the core framework and profiles of other technologies that are defined to fit within the framework Much of the work of the WS-Security Technical Committee at OASIS is involved in adding profiles to the WS-Security suite of specifications At the time of writing, the WS-Security framework consists of the following specifications: Web Services Security: SOAP Message Security Web Services Security: User name Token Profile
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XML Signature and XML Encryption are fundamental security specifications for protecting Web services data Because Web services specifications are all applications of XML, the specifications themselves can be protected using these core XML technologies For example, if you want to protect your WSDL files against unauthorized access, you can encrypt them If you want to protect your WSDL files against tampering, you can sign them These specifications, along with SAML, XACML, and XKMS, are not specific to Web services because they are general to XML and are not specifically adapted to SOAP and WSDL the way the other specifications in this chapter are XML Signature defines how to verify that the contents of an XML document have not been tampered with and arrived unchanged from the way they were sent XML Encryption describes how to encrypt all or part of any XML document so that only the intended recipient can understand it It's especially important to consider using these XML security technologies when the XML data needs to be protected outside the context of a SOAP message and when the Web services metadata needs to be protected from unauthorized access WS-Security uses XML Signature and XML Encryption to help ensure confidentiality and integrity of SOAP messages, but it does not describe how to use these XML technologies outside the context of SOAP and WSDL, which may be important for some applications, especially those storing XML in a kind of intermediate format between transmissions If a purchase order (PO) has to be stored in the middle of a business process, for example, XML Encryption can be used to guard against unauthorized access to its contents, and XML Signature can be used by the next step in the business process to ensure that the PO has not been tampered with
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