[WiX-users] When are elevated permissions dropped?

[Brownfield, Cory]

To illustrate a problem I'm having with a real project, I created a test script 
that runs a custom action that requires elevated privileges during uninstalls.  
If I configure it to run before "InstallFinalize" (deferred, no impersonation), 
the uninstall fails to complete.  The event log says "A program run as part of 
the setup did not finish as expected" and indicates the program being called by 
the custom action.  Changing it to run after "DeleteServices" works.  I think 
that this indicates a problem with permissions.  Shouldn't the elevated 
permissions remain before "InstallFinalize"?

Here's the script.  The custom actions and the install execute sequence are the 
interesting parts:

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi";>
  <Product Id="*"
           Name="Foo2"
           Language="1033"
           Version="1.0.0.0"
           Manufacturer="Foo"
           UpgradeCode="55369FED-96BF-4D95-99E4-E7D746A54C62">
    <Package InstallerVersion="200"
             Compressed="yes"
             InstallScope="perMachine" />

    <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is 
already installed." />
    <MediaTemplate />
    <Condition Message="You need to be an administrator to install this 
product.">Privileged</Condition>

    <Feature Id="ProductFeature"
             Title="FooInstaller"
             Level="1">
      <ComponentGroupRef Id="ProductComponents" />
    </Feature>

    <CustomAction Id="AddEndpoint"
                  Execute="deferred"
                  Directory="INSTALLFOLDER"
                  ExeCommand="[SystemFolder]netsh.exe http add urlacl 
url=http://+:49260/Foo2/ user=\Everyone"
                  Impersonate="no"
                  Return="check" />
    <CustomAction Id="DeleteEndpoint"
                  Execute="deferred"
                  Directory="INSTALLFOLDER"
                  ExeCommand="[SystemFolder]netsh.exe http delete urlacl 
url=http://+:49260/Foo2/";
                  Impersonate="no"
                  Return="check" />

    <InstallExecuteSequence>
      <!-- Configure http ports -->
      <Custom Action="AddEndpoint"
              Before="InstallFinalize"><![CDATA[NOT Installed]]></Custom>
      <Custom Action="DeleteEndpoint"
              Before="InstallFinalize"><![CDATA[Installed AND NOT 
REINSTALL]]></Custom>
    </InstallExecuteSequence>
  </Product>

  <Fragment>
    <Directory Id="TARGETDIR"
               Name="SourceDir">
      <Directory Id="ProgramFilesFolder">
        <Directory Id="INSTALLFOLDER"
                   Name="Foo2" />
      </Directory>
    </Directory>
  </Fragment>

  <Fragment>
    <ComponentGroup Id="ProductComponents"
                    Directory="INSTALLFOLDER">
      <Component Id="ProductComponent">
        <File Id="HelloFile"
              Name="HelloFile.txt"
              Source="hello.txt" />
      </Component>
    </ComponentGroup>
  </Fragment>
</Wix>
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