**How Can Non-Administrators Start Windows Services in C ?**

Start Windows Service from Application without Administrator Rights (C )

Starting a Windows service from a separate application without administrator privileges can be a challenge. However, there is a secure and effective solution that allows non-administrators to initiate service actions.

One possible approach entails modifying the permissions associated with the service object during installation. By adjusting the security descriptor, you can grant the necessary permissions to non-admin users, ensuring they can start and stop the service.

Using Windows APIs such as ConvertStringSecurityDescriptorToSecurityDescriptor and SetServiceObjectSecurity, you can modify the service object's security settings as follows:

<code class="c++">wchar_t sddl[] = L"D:"
  L"(A;;CCLCSWRPWPDTLOCRRC;;;SY)"           // default permissions for local system
  L"(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)"   // default permissions for administrators
  L"(A;;CCLCSWLOCRRC;;;AU)"                 // default permissions for authenticated users
  L"(A;;CCLCSWRPWPDTLOCRRC;;;PU)"           // default permissions for power users
  L"(A;;RP;;;IU)"                           // added permission: start service for interactive users
  ;

PSECURITY_DESCRIPTOR sd;

if (!ConvertStringSecurityDescriptorToSecurityDescriptor(sddl, SDDL_REVISION_1, &sd, NULL))
{
   fail();
}

if (!SetServiceObjectSecurity(service, DACL_SECURITY_INFORMATION, sd))
{
   fail();
}</code>

You'll need a service handle with WRITE_DAC permission to perform these operations. By including the (A;;RP;;;IU) statement in the SDDL, non-admin users will be granted the ability to start the service. If you also wish to allow them to stop the service, add the WP right, resulting in the following:

<code class="c++">L"(A;;RPWP;;;IU)"                           
  // added permissions: start service, stop service for interactive users</code>

This approach allows you to empower non-administrators with service control capabilities without compromising system security. By carefully configuring permissions, you can provide the necessary functionality while maintaining appropriate levels of access.

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