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Enabling WS-Security

Apr 23, 2013 16:18

Janet Revell

Apr 25, 2013 14:56

Mulesoft Current Mule Documentation

Enabling WS-Security

Mulesoft Documentation Page

Contents

Enabling WS-Security
Enterprise

 Contents

When a Web service exposes private-network data to the outside world, that data travels through 4 - 7 separate protocol layers (see: TCP/IP or OSI) thus introducing potential security vulnerabilities. Implementing security at a higher layer on the protocol stack — the application layer, for instance — generally provides better protection than an implementation at the lower transport layer, which provides only HTTPS security.

To implement application-layer security, enable WS-security (a CXF configuration) on your Web service. WS-security defines a new SOAP header which is capable of carrying various security tokens that systems use to identify a Web service caller's identity and privileges, and can include the following:

  • encryption
  • digital signature
  • time stamp

You can also add custom Token Validators to the SOAP Component.

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Enabling WS-Security

To enable WS-security on a CXF Web service in your application, you must add WS-configurations to the SOAP Component in your flow. This approach enables WS-security locally within your flow, for one Web service only.

To the Mule flow that involves a Web service, add a SOAP Component to publish, consume, or proxy a Web service. Complete the following steps to configure WS-security on the SOAP component.

    1. Open the Pattern Properties panel, then click the Security tab. 



    2. Click the (plus) icon in the Add Configuration Element pane to create a new key-value pair. 




      In XML, this step mirrors the addition of a key-value pair inside the ws-config child element of a ws-security element. By adding configuration elements to your SOAP component, you are creating a map of key-value pairs that correspond to the CXF WSS4J security-configuration text strings in WSHandlerConstants and WSConstants.

    3. Enter a key, such as action, in the open Key field and press Enter.
    4. Double-click the new key-value line item you created to open the Add Configuration Property panel. 



    5. Enter information in either the Value field OR the Value Reference Field according to the table below.

      ValueEnter a WS Constant (a class to define the kind of access the server allows) or a WSHandlerConstant (a class to specify the names, actions, and other strings for data deployment of the WSS handler). For example, enter UsernameToken in the value field.
      Value ReferenceEnter the bean that the key must reference. When the key must reference a bean (for instance, when the key is passwordCallbackRef), enter the name of the bean in the Value Reference field.
    6. Click Finish to save the key-value pair. 

    7. Repeat the steps above to add as many ws-security configurations as you wish to your Web service, then click OK to save your configurations.

     

    1. To your CXF element (i.e. SOAP component), add a child element for cxf:ws-security.
    2. Within the cxf:ws-security child element, add a child element for cxf:ws-config.
    3. Within the cxf:ws-config child element, add a child element for cxf:property.
    4. Add two attributes to the cxf:property child element according to the table below. Be sure to enter either a valueOR a value-ref; the two are mutually exclusive.

      keySpecify a name for the property.
      valueSpecify a WS Constant (a class to define the kind of access the server allows) or a WSHandlerConstant (a class to specify the names, actions, and other strings for data deployment of the WSS handler). For example, enter UsernameToken in the value field.
      value- refSpecify the bean that the key must reference. When the key must reference a bean (for instance, when the key is passwordCallbackRef), specify the name of the bean as the value-ref.
    5. Repeat the preceding step to add as many WS-security configurations as you wish to your Web service. Refer to sample code below.
     View the Namespace


     

    Adding a Token Validator

    If you have enabled WS-Security on your Web service in Mule, you can further configure the SOAP component to delegate authentication of the message credentials it transmits or receives.

    A SOAP component may get bogged down with the tasks of both processing and authenticating messages. To lighten this load, you can instruct WS-security to delegate certain message authentication tasks to a Token Validator, including:

    • validating the UsernameToken in cases where the CallbackHandler implementation does not have access to the password
    • validating the attributes of a received SAML assertion
    • dispatching a received security token to a third-party security service for validation

    Complete the following procedure to add token validators to your Web service.

      1. In the Security tab of your SOAP component, click one or more of the check boxes to delegate message authentication tasks to token validators. Refer to the table below for the activity of each token validator.

        Token Validator

        Purpose

        User Name

        Authenticates the username and password credentials associated with each message in a manner similar to HTTP Digest authentication.

        SAML 1

        Checks messages against SAML 1.1 assertion statements in order to approve or reject access to the Web service.

        SAML 2

        Checks messages against SAML 2.0 assertion statements in order to approve or reject access to the Web service.

        Timestamp

        Examines the timeliness of messages – when they were created and received, and when they expire – to make decisions about which messages to process.

        Signature

        Examines the digital signature attached to messages to make decisions about which messages to process.

        Binary Security Token

        Examines binary encoded security tokens (such as Kerberos) to make decisions about which messages to process.

      2. In the Bean field associated with the token validator you have selected, use the drop-down menu to select an existing bean that your token validator will reference to apply, replace, or extend the default behavior associated with a specific security token. 
         

        If you have not yet created any beans, click the (plus) button to open a new properties panel in which you can create and configure a new bean. The bean imports the Java class you have built to specify the custom validator's override behavior.

         View Java code for Bean Creation
      3. Click OK to save changes.

       

      1. Above all flows in your Mule project, create a global spring:bean element to import the Java class you have built to specify the token validator's behavior. Refer to code sample below.

         View Java code for Bean Creation
      2. To the CXF element in your flow, add a child element (below any cxf:ws-config elements you may have added) for cxf:ws-custom-validator.
      3. To the cxf:ws-custom-validator child element, add a child element according to the type of action you want the validator to perform. Refer to the table below.

        Token Validator

        Purpose

        cxf:username-token-validator

        Authenticates the username and password credentials associated with each message in a manner similar to HTTP Digest authentication.

        cxf:saml1-token-validator

        Checks messages against SAML 1.1 assertion statements in order to approve or reject access to the Web service.

        cxf:saml2-token-validator

        Checks messages against SAML 2.0 assertion statements in order to approve or reject access to the Web service.

        cxf:timestamp-token-validator

        Examines the timeliness of messages – when they were created and received, and when they expire – to make decisions about which messages to process.

        cxf:signature-token-validator

        Examines the digital signature attached to messages to make decisions about which messages to process.

        cxf:bst-token-validator

        Examines binary encoded security tokens (such as Kerberos) to make decisions about which messages to process.

      4. Add a ref attribute to the validator to reference the global spring:bean element which imports the Java class.
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      Complete Code Example

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       View Example Code

       

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