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POHow to make Custom PrincipalPermissionAttribute handle user or role changes
 

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  1. POHow to make Custom PrincipalPermissionAttribute handle user or role changes
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    <p>I have written a custom PrincipalPermissionAttribute that uses an AuthenticationService instead of Thread.CurrentPrincipal as PrincipalPermissionAttribute does. </p> <p>It works as I like, but if the user logs out and back in, or if the user's roles were to change, the attribute code is never called a second time. I suspect I've not informed the attribute it needs to recheck the permission? Breakpoint set on the CreatePermission method only ever hits once. </p> <p>Is an attribute code only ever evaluated once? The attribute is currently decorating an event handler for a button click on my View's codebehind.</p> <p>If I change my method back to use the PrincipalPermissionAttribute then it does work as I expect, logging out and back in as a user without the right role throws the SecurityException I expect. Have I missed overriding a property perhaps?</p> <pre><code>[Serializable] [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, AllowMultiple = true, Inherited = false)] public sealed class RolePermissionAttribute : CodeAccessSecurityAttribute { private readonly PrincipalPermission _revoke = new PrincipalPermission(PermissionState.None); private readonly PrincipalPermission _allow = new PrincipalPermission(PermissionState.Unrestricted); private IList&lt;string&gt; _roles; private readonly IAuthenticationService _authorisationService; public RolePermissionAttribute(SecurityAction action) : this(action, ServiceLocator.Current.GetInstance&lt;IAuthenticationService&gt;()) { } public RolePermissionAttribute(SecurityAction action, IAuthenticationService authorisationService) : base(action) { _authorisationService = authorisationService; } public string Roles { get; set; } public bool Authenticated { get; set; } public override IPermission CreatePermission() { _roles = (this.Roles ?? string.Empty).Split(',', ';') .Select(s =&gt; s.Trim()) .Where(s =&gt; s.Length &gt; 0) .Distinct() .ToList(); bool result = false; if (_authorisationService != null) { var principal = _authorisationService.ClientSecurityPrincipal; if (principal == null) { throw new SecurityException("Access Denied. You are not logged in"); } // If Authenticated is enforced then revoke if user is not authenticated if (Authenticated &amp;&amp; !_authorisationService.IsAuthenticated) { throw new SecurityException("Access Denied. You are not authenticated"); } // Allow if the principal is in any of the roles result = _roles.Any(principal.IsInRole); if (!result) { throw new SecurityException("Access Denied. You are not in an allowed Role"); } } return result ? _allow : _revoke; } } </code></pre> <p>}</p> <p>Here's the method with the attribute</p> <pre><code>[RolePermission(SecurityAction.Demand, Authenticated = true, Roles = "Admin")] private void barButtonItemConfig_ItemClick(object sender, ItemClickEventArgs e) { // Do stuff } </code></pre>
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    1. PTQuestion
    1. USStephen Price
    1. USStephen Price
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    1. COCould you please include the code for the attribute you have added to your view's button click handler?
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      1. POHow to make Custom PrincipalPermissionAttribute handle user or role changes
      1. USNicole Calinoiu
 

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