[Kget] Q What is the best way to implement split knowledge and dual control of keys?

[Cain Ray]

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Active at LogonUAC starts working when a user logs onto a machine. This
will make it easier to determine the state and version of the
application when updating the binaries after a bug fix or to add
functionality. Here you can create a directory specific to your
application and allow users to write to it. When possible, you should
design your apps to limit the need for admin privileges to narrow
sections of code, or communicate to an application started with full
administrator privileges. When you launch this service while running as
an administrator, it works just fine. This takes precedence over any
other type of application marking including an application compatibility
marking or UAC's Installer Detection, which is described later. However,
there are also wildcards that can be used to control how this
prioritization works.
In the enterprise, this lets users run in the Users group rather than as
Administrators, allowing meaningful corporate security policies to be
enforced. UAC doesn't apply to services; there are other security
settings available for Windows services that I'll discuss later.
This indicates to the provider that the user wants to perform an
interactive logon. If the user who attempted to create this process is
not an administrator, he will be presented with the Credential dialog to
input his credentials.
First, the console session LogonUI process is started by winlogon.
Since the hybrid provider concept is user name and password-based, I
started with the stripped-down sample password provider from the
Platform SDK.
When a process is marked as requiring administrator privileges in the
manifest or in the application compatibility settings, UAC will prompt
the user for elevation.
Designing Apps that Require Administrator PrivilegesMy honest advice
about writing applications that require administrator privileges is:
don't do it!
The -u argument is the URL prefix that tells HTTP. And finally, if
there's no default yet, this credential becomes the default. Get the
sample code for this article.
Then I added the PropCert sample from the SDK; this includes the logic
to enumerate smart card readers, cards, and digital certificates.
Note that all credential provider-related interfaces are defined in the
new public header, credentialprovider. SYS does port sharing. The three
choices for run level are: asInvoker, highestAvailable, and
requireAdministrator.
This could be a string, like "Attack at dawn! Because of the commutative
property of XOR, the order in which this happens doesn't matter.
If it finds one, a CHybridCredential is instantiated and associated with
the current CHybridProvider.
This starts with creating a restricted, or filtered, token during
interactive logon for users with elevated privileges. Get the sample
code for this article.
This would require administrator privileges.
But if you lose your smart card and log on with your password, the
password credential provider's tile will win for that session when you
unlock. This is very useful for creating objects that run elevated and
are exposed in your application's UI.
" onto all the thumb drives that are currently plugged into the machine.
I'll discuss Windows Communication Foundation Web services running under
normal user accounts, and the use of split knowledge and dual control of
keys for protecting credit card data. I'll get into that a little later.
Note this one potentially confusing point: the name of the text field is
retrieved via GetFieldDescriptorAt while the current text value in the
field is retrieved via GetStringValue.
For the hybrid credential provider, this results in the creation of a
CHybridProvider. Here you can create a directory specific to your
application and allow users to write to it. The next most important step
is deciding where to save your application binaries and per-user
configuration data. Generally the more explicit registration wins.
Such an environment also keeps users from affecting each other's state
and settings. A Many Web sites accept credit card holder data, including
credit card numbers, billing addresses, and so on.
As I mentioned, one way to solve this problem is to host your service in
IIS.