Improving Web Application Security: Threats and - CGISecurity

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564 Part IV: Securing Your Network, Host, and ApplicationURL AuthorizationAny application can use this gatekeeper. It is configured using elements that control which users and groups of users should have access to theapplication. The default element from Machine.config is shown below:URL Authorization NotesUse the following to help you successfully configure URL Authorization:●●●Authorization settings in Web.config usually refer to all of the files in the currentdirectory and all subdirectories, unless a subdirectory contains its own Web.configwith an element. In this case, the settings in the subdirectoryoverride the parent directory settings.URL authorization only applies to file types that are mapped by IIS to theASP.NET ISAPI extension: Aspnet_isapi.dll.When your application uses Windows authentication, you are authorizing accessto Windows user and group accounts. User names take the form of“authority\WindowsUserName” and role names take the form of“authority\WindowsGroupName”, where authority is either a domain name orthe local machine name depending on the account type.A number of well known accounts are represented with “BUILTIN”strings. For example, the local administrators group is referred to as“BUILTIN\Administrators”. The local users group is referred to as“BUILTIN\Users”.Note With.NET Framework version 1.0, the authority and the group name are case sensitive.The group name must match the group name that appears in Windows exactly.●When your application uses Forms authentication, you authorize the custom userand roles maintained in your custom user store. For example, if you use Forms toauthenticate users against a database, you authorize against the roles retrievedfrom the database.
Chapter 19: Securing Your ASP.NET Application and Web Services 565●You can use the tag to apply authorization settings to an individual fileor directory. The following example shows how you can apply authorization to aspecific file (page.aspx):Session StateApplications that rely on per user session state can store session state in the followinglocations:● In the ASP.NET worker process● In an out-of-process state service, which can run on the Web server, or on aremote server● In a SQL Server data storeThe relevant location, combined with connection details, is stored in the element in Machine.config. This is the default setting:Note If you do not use the ASP.NET state service on the Web server, use the MMC Services snapinto disable it.Securing a SQL Server Session State StoreIf you use a SQL Server session state store, use the following recommendations tohelp secure the session state:● Use Windows authentication to the database● Encrypt sqlConnectionString● Limit the application’s login in the database● Secure the channel
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Contents xxvii.NET Remoting Securit
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Part IIntroduction to Threats andCo
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3Threat ModelingIn This Chapter●
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Chapter 3: Threat Modeling 47Threat
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Part IIDesigning SecureWeb Applicat
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Part IIIBuilding Secure WebApplicat
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8Code Access Security in PracticeIn
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11Building Secure ServicedComponent
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Part IVSecuring Your Network,Host,
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18Securing Your Database ServerIn T
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How To:Use URLScanApplies ToSummary
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patterns & practicesProven practice
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