How Can Non-Administrator Users Start and Stop Windows Services in C ?
Oct 25, 2024 am 04:07 AMStarting Windows Service from Application without Administrator Rights (C )
Question:
How can a user start or stop a Windows service from a non-administrator application without the need for administrator rights?
Answer:
To grant non-administrator users the ability to start and stop a Windows service, modify the service permissions. This process should ideally be performed during service installation.
Use the following steps:
- Obtain the Service Handle: Open a handle to the target service with the WRITE_DAC permission.
- Create the Security Descriptor (SDDL): Construct an SDDL string that specifies the desired permissions for various user groups, such as allowing interactive users to start the service:
<code class="pre">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 ;</code>
- Convert and Set the SD: Convert the SDDL string to a security descriptor and set it on the service object using the SetServiceObjectSecurity function:
<code class="pre">PSECURITY_DESCRIPTOR sd; if (!ConvertStringSecurityDescriptorToSecurityDescriptor(sddl, SDDL_REVISION_1, &sd, NULL)) { fail(); } if (!SetServiceObjectSecurity(service, DACL_SECURITY_INFORMATION, sd)) { fail(); }</code>
To grant non-admin users the right to stop the service as well, include the WP right in the SDDL string:
<code class="pre">L"(A;;RPWP;;;IU)" // added permissions: start service, stop service for interactive users</code>
Refer to Wayne Martin's blog entry for additional SDDL codes for service rights.
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