sql server 2014 - Application Security Models

Hi experts

what is it the difference between
Trusted Server Application Security Model
and
Impersonation / Delegation Security Model
enrique_aeoAsked:
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plusone3055Commented:
that is a very long answer

this sums it up really well

Taken from
http://www.informit.com/articles/article.aspx?p=169580&seqNum=3

Security models for distributed applications may choose to adopt two different approaches: the Trusted model or the Delegate model. Both models require knowing the identity of the caller on the server side. In the Trusted model, access checks are performed "at the gate" when the remote call hit the application server.

This is typically done using COM+ or .NET role- based security, which performs access checks at the application level semantic. In the Trusted model, the "check at the gate" is considered exhaustive. After the call is allowed to get into the application layer, the work is done using the identity of the process hosting the component (this includes database access).

On the other hand, in the Delegate model "checks at the gate" (if any) are not considered exhaustive; hence, the execution of the remote call is done impersonating the caller identity, so additional access checks at the database level or by other downstream application server can be done against the original caller credentials.

The Trusted model is by far the easiest one to implement and manage, whereas the Delegate model is more difficult to implement properly and requires a much more administrative burden. In some situations, strict requirements dictate the adoption of a Delegate model. Most times, however, a Trusted model coupled with robust auditing will strike the balance between security requirements and ease of management.

 
thankfully the people at microsoft have very rich articles concerning both

Trusted
https://msdn.microsoft.com/en-us/library/aa905320.aspx

Impersonated
https://msdn.microsoft.com/en-us/library/ff647248.aspx

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enrique_aeoAuthor Commented:
what is it the difference between
Trusted Server Application Security Model - SQL Server access is based on application identity
and
Impersonation / Delegation Security Model- SQL Server access is based on user identity
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Microsoft SQL Server 2008

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