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Principal principal_class_name вЂњprincipal_nameвЂќ, principal principal_class_name вЂњprincipal_nameвЂќ, Grant signedBy вЂњsigner_namesвЂќ, codeBase вЂњURLвЂќ, The basic format looks like the following: The grant keyword is used to start a grant section, followed by zero or more optional elements: signedBy, codeBase, and principal.

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The policy file contains a list of grant sections that grant permissions to code or principals.

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Consult the documentation for this class for a full list of permissions that it provides. The class exists to guard access to the Policy, Subject, LoginContext, and Configuration objects, providing a layer of security on these classes as well. The policy file provides a way to grant permissions to both code and principals. Each application can use a policy file that contains a list of permissions for various targets. JAAS provides authorization for granting degrees of access to an entity. The user (or other entity) is either authenticated or not. The LoginContext retrieves the set of LoginModules to execute from the configuration under the name BasicConsoleLogin.ДЄuthentication provides for more of a black-and-white approach to security. LoginContext.login() // utilizes callbacks Subject subject = loginContext.getSubject() LoginContext loginContext = new LoginContext(вЂњBasicConsoleLoginвЂќ) The logout method removes credentials/principals from the authenticated subject.Д®ssentially, the code used for an application to log in, obtain an authenticated subject, and then log out looks like the following snippet of code: Public void logout() throws LoginException The subject may have revised credentials and principals after all authentication is performed: If authentication succeeds, you can retrieve the subject via getSubject(). This method causes all configured LoginModules to authenticate the subject. Public void login() throws LoginException The LoginContext also provides login and logout methods:

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One or more callbacks can be specified, allowing you to separate username and password entries into two separate callbacks all managed by a single CallbackHandler. Throws java.io.IOException, UnsupportedCallbackException The CallbackHandler interface defines a single method: For example, if a username and password are required, a class can inherit from .CallbackHandler and retrieve the information from the user. If a LoginModule has to communicate with the user, it can do so through a CallbackHandler. The first and third forms of the constructor create an empty subject because one isnвЂ™t passed in. The name parameter corresponds to an entry in the configuration used for the application. Public LoginContext(String name, Subject subject, CallbackHandler callbackHandler) Public LoginContext(String name, Subject subject) throws LoginException public LoginContext(String name, CallbackHandler callbackHandler) Public LoginContext(String name) throws LoginException The LoginContext class provides the following constructors: This makes it easy to change the configuration for an application by adding or removing a LoginModule. The LoginContext class provides a clean approach to authenticating subjects while leaving the authentication details to LoginModules. The ModuleOptions is a space-separated list of login module-specific name=value pairs. The LoginModule is not required to succeed, and control passes down the list List of LoginModules even if this one fails. If the LoginModule succeeds,Д¬ontrol is immediately returned to the application. The LoginModule is not required to succeed. If it fails, control returns to the appli-Д¬ation. Specified after the current one still execute. The LoginModule is required to succeed however, if it fails, LoginModules The FLAG can be one of the values in the following table. The LoginModuleClass is the fully qualified name of a LoginModule.

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