在做文件過濾驅動的時候,經常會想知道這個文件訪問請求是來自本地還是網絡的,這樣就可以根據自己制定的安全策略,決定是否允許這些請求完成,因此,成功的判斷來自網絡的文件訪問就十分必要了。剛剛從驅網bmyyyud的Blog那裏看到的一篇相關文章,還沒有來得及測試,先轉載過來吧,有空試試。
//---------------------------------------------------
//從IrpStackLocation中判斷來自網絡的文件訪問
BOOLEAN SfIsFromNetAccess(
PIO_STACK_LOCATION IrpSp
)
{
NTSTATUS status;
PACCESS_TOKEN pToken = NULL;
PTOKEN_SOURCE pTokenSrc = NULL ;
PSECURITY_SUBJECT_CONTEXT secSubCtx;
//PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
secSubCtx = &(IrpSp->Parameters.Create.SecurityContext->AccessState->SubjectSecurityContext);
if (secSubCtx->ClientToken != NULL || secSubCtx->PrimaryToken != NULL)
{
pToken = SeQuerySubjectContextToken(secSubCtx);
}
if (pToken == NULL)
{
//KdPrint(("SeQuerySubjectContextToken Errorn"));
return FALSE;
}
//
// Get TokenSource Name If SourceName is "NtLmSsp" it was logged-in via Lanmanager,
// "User32" represents localy logged-in users.
//
__try
{
status = SeQueryInformationToken(pToken,TokenSource,&pTokenSrc);
if (NT_SUCCESS(status))
{
pTokenSrc->SourceName[TOKEN_SOURCE_LENGTH-1] = 0x00;
KdPrint(("Token Name :%s Len:%dn",pTokenSrc->SourceName,strlen(pTokenSrc->SourceName)));
if (_stricmp(pTokenSrc->SourceName,"NtLmSsp") == 0 )
{
KdPrint(("NetWork Access Token Findn"));
return TRUE;
}
}
else
{
KdPrint(("SeQueryInformationToken Error:0x%xn",status));
}
}
__finally
{
ExFreePool(pTokenSrc);
}
return FALSE;
}