Retrieves the security ID of the base process that initiated the sequence of calls from which the call into the current object originated.
Provided By
HRESULT ISecurityProperty::GetOriginalCallerSID (
PSID* ppSid
);
Parameters
ppSid
[out] A reference to the security ID of the base process that initiated the call sequence from which the current method was called.
Return Values
S_OK
The security ID of the base process that originated the call into the current object is returned in the parameter ppSid.
E_INVALIDARG
The argument passed in the ppSid parameter is a NULL pointer.
E_FAIL
An unexpected error occurred.
Remarks
You use the GetOriginalCallerSID method to determine the security ID of the original process that initiated the call sequence from which the current method was called. The following scenario illustrates the functionality of the GetOriginalCallerSID method.
Base process 1, running on server A as user A, creates object X on server B, running as user B. Then base process 1 passes its reference on object X to base process 2, running on server D as user D. Base process 2 uses that reference to call into object X. object X then calls into object Y, running on server C. If object Y then calls GetOriginalCallerSID, the the security ID of user D is returned.
Note Usually, an object's original caller is the same process as its original creator. The only situation in which the original caller and the original creator would be different is one in which the original creator passes a reference to another process, and the other process initiates the call sequence (as in the preceding example).
Note The path to the original caller is broken if any object along the chain was created by some other means than IObjectContext::CreateInstance or ITransactionContext::CreateInstance. For example, if base process 1 uses CoCreateInstance to create X, when Y calls GetOriginalCallerSID, the the security ID it gets back will be the the security ID of user B, not user D. This is because the call sequence is traced back through the objects' context and MTS can only create a context for an object that's created with either IObjectContext::CreateInstance or ITransactionContext::CreateInstance.
You must call ReleaseSID on a security ID when you finish using it.
See Also
Programmatic Security, Advanced Security Methods, IObjectContext Interface