Improving Web Application Security: Threats and - CGISecurity

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554 Part IV: Securing Your Network, Host, and Application●Hosting scenario. Hosting companies need to constrain applications so theycannot access each other’s resources and so that they have limited access to criticalsystem resources. To do so, you can configure all applications to run at a partialtrustlevel. For example, the medium-trust level constrains an application so that itcan only access files within its own virtual directory hierarchy and restricts accessto other types of resources. For more information, see Chapter 9, “Using CodeAccess Security with ASP.NET.” To apply a medium-trust policy for allapplications on your server, use the following configuration:
Chapter 19: Securing Your ASP.NET Application and Web Services 555Web.configThe .NET Framework does not install any Web.config files. If you install anapplication that supplies its own Web.config, it usually inherits its ACL from theinetpub directory, which by default grants read access to members of the Everyonegroup. To lock down an application-specific Web.config, use one the following ACLs.For .NET Framework version 1.0:Administrators: Full controlSystem: Full controlASP.NET process identity: ReadUNC Identity: ReadImpersonated Identity (Fixed Identity): ReadImpersonated Identity (Original Caller): ReadFor .NET Framework version 1.1:Administrators: Full controlSystem: Full controlASP.NET process identity: ReadUNC Identity: ReadImpersonated Identity (Fixed Identity): ReadIf your applications use impersonation of an explicit account (that is, if theyimpersonate a a fixed identity), such as , then both thataccount (WebUser, in this case) and the process need Read access.If your code base is on a Universal Naming Convention (UNC) share, you must grantread access to the IIS-provided UNC token identity.If you are impersonating but not using explicit credentials, such as , and no UNC, then only the process should need access in the.NET Framework 1.1. For the .NET Framework 1.0, you must additionally configurethe ACL to grant read access to any identity that will be impersonated (that is, youmust grant read access to the original caller).Trust Levels in ASP.NETAn application’s trust level determines the permissions it is granted by CAS policy.This determines the extent to which the application can access secure resources andperform privileged operations.
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Contents xxvii.NET Remoting Securit
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Contents xxixStaying Secure (contin
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Contents xxxiASP.NET Architecture o
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xxxviiChecklistSecuring Da
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Contents xxxixHow ToIndex 743How To
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Forewords xlvForeword by Joel Scamb
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Forewords xlviiFinally, techniques
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Fast Track — How To Implementthe
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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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Chapter 3: Threat Modeling 61Note I
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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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21Code ReviewIn This Chapter●●
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Chapter 21: Code Review 607For exam
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22Deployment ReviewIn This Chapter
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Related Security ResourcesRelated M
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patterns & practicesProven practice
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