Security :: Finding Membership Authentication And ASPXAUTH Cookie Size
Oct 31, 2010
Without reading the whole text below, since this is on the ASP.Net side ... basically I think I need to know if there is a way to reduce the size of the forms authentication cookie. When using a DotNet 2.0 website, the ASPXAUTH cookie is about 232 bytes ... when using the same source code but upgraded to DotNet 4.0. the cookie is approximately 264 bytes, setting the ticketCompatabilityMode does not reduce the size since I think the default setting is Framework20. I length of the cookie, including the its' name can not be larger than 256 bytes in order to use it with the "Client Application Services".
I only did a cursory search of the asp.net forums, but will dilligently look for an existing solution.
----- BACKGROUND AND RESEARCH -----
I have been using all three features of client application services (authentication, profiles, and roles) in my windows app (DotNet 3.5 framework) for almost two years now. Up until now, I have not had any problems. This week I hit a brick wall and am pretty stumped with two seperate but related issues.
Issues:
In development, we decided to upgrade our websites/services to DotNet 4.0. All applications upgraded successfully. However we are unable to log into our application using Client Application services. No matter what user we use, Membership.ValidateUser returns false. Since we know the username and passwords, we thought this was strange. When debugging the application, we found that Membership.ValidateUser was throwing an InvalidOperationException (see below for complete exception) stating that the ASPXAUTH property was too long, longer that the schema created in the SQL/CE database. (See below for things tried).
In production .. A user all of the sudden could no longer gain access to the application. Upon inspection, his ASPXAUTH cookie was 264 characters long (9 characters longer than the schemas nvarchar(256)). Even though the user was being authenticated on the "server side", and the JSON query returned "{"d":true}", Membership.ValidateUser returned false. Again, as in the case above, the actual error was ...
Message=@PropValue : String truncation: max=256, len=264 ...
I am assuming I am missing something very simple or that I overlooked a settings. In development, this is not a huge issue as I can release the Dotnet 4.0 websites when I am ready. But now that this has happened to a client on a production system, it is very worrisome.
[code]....
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[code]....
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IssueDate: #1/21/2010 1:22:27 PM#
Name: "jaymo "
UserData: ""
Version: 2
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