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Unfortunately, this is where the standardization ends Please consult your container s documentation for how to complete the implementation of client certificate authentication
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Container-Managed Authorization and the Concept of Roles
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Now that we have discussed how users prove their identities to the Web application, let s examine how the Web application designer can restrict access to various parts of the application The <security-constraint> element in the webxml file is used to provide this feature
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<web-app> <!-- intervening elements omitted --> <security-constraint> <web-resource-collection> <web-resource-name>trainer modules</web-resource-name> <url-pattern>/admin/*</url-pattern> </web-resource-collection> <auth-constraint> <role-name>trainer</role-name> </auth-constraint> </security-constraint> <login-config> <auth-method>BASIC</auth-method> <realm-name>UserDatabase</realm-name> </login-config> <!-- intervening elements omitted --> </web-app>
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The preceding XML states the following about the application This Web application may have zero or more security constraints Each security constraint contains zero or more collections of pages, and access to any of the pages is predicated on the user being a member of the specified role A user s membership in a role is determined using some form of authentication method The previous webxml excerpt says, Users that try to access any page inside of the top-level admin directory must be authenticated using basic authentication, with the authentication database being provided by the container-specific UserDatabase Once authenticated, they must be a member of the trainer group in order to be allowed to see the page Each of the elements related to authorization in <security-constraint> is described in Table 15-2 You may ask, if the only interesting element inside of <auth-constraint> is <role-name>, why do we need the <auth-constraint> element This is to distinguish the role from the <user-data-constraint> element, which dictates which transport-level security is to be used to protect the resources in the collection More on <user-data-constraint> in the next section
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Container-Managed Data Security
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The last aspect of Web application security is Data Security Generally, this aspect builds on top of authentication and authorization, but this need not necessarily be the case For example, any user may view the Web page for Sun s JSF implementation on javanet at https://javaserverfacesdevjavanet/, but in order to file issues in the issue tracker, or take any other actions, the user must have the appropriate authentication and authorization As with all aspects of container-managed security, data security is configured using the
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Element Name web-resource-collection
Contained in Element security-constraint
Description A collection of content in your Web application Typically, this means a collection of JSP pages and the images, scripts, and other content used by those pages You must have at least one <web-resource-collection> inside your <security-constraint> element A human-readable name you can attach to the collection There must be exactly one <web-resource-name> per <security-constraint> element A pseudo regular-expression style syntax for grouping pages together For example, the url-pattern /admin/* includes pages inside the admin directory You can also use a file extension as a url-pattern for example, /*jsp is a url-pattern that identifies all JSP files in the root directory of the Web application There may be zero or more <url-pattern> elements in the <webresource-collection> element The absence of a <url-pattern> means the constraint doesn t apply to any resource Contains zero or more <role-name> elements If any of the elements is the asterisk character (*), all users are granted access to the resources defined in the <web-resource-collection> The name of a role defined in a container-specific fashion For example, in elements in the tomcat-usersxml file as described earlier
web-resource-name
web-resource-collection
url-pattern
web-resource-collection
PART III
auth-constraint
security-constraint
role-name
auth-constraint
TABLE 15-2 Elements in <security-constraint>
webxml file Let s complete our example from the trainer by stating that all trainer pages be transmitted between server and client using data security
<web-app> <!-- intervening elements omitted --> <security-constraint> <web-resource-collection> <web-resource-name>trainer modules</web-resource-name> <url-pattern>/admin/*</url-pattern> </web-resource-collection> <auth-constraint>
Part III:
Applying JavaServer Faces
<role-name>trainer</role-name> </auth-constraint> <user-data-constraint> <transport-guarantee>CONFIDENTIAL</transport-guarantee> </user-data-constraint> </security-constraint> <login-config> <auth-method>BASIC</auth-method> <realm-name>UserDatabase</realm-name> </login-config> <!-- intervening elements omitted --> </web-app>
The only new element here is <user-data-constraint> and its child <transport-guarantee> Valid values for <transport-guarantee> are NONE, INTEGRAL, and CONFIDENTIAL Generally, the latter two imply SSL In order to use SSL on your server you must give it an identity certificate and public/private key pair (described earlier in the section titled Certificate Authentication ) using container-specific techniques
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