- 1 year ago
Modify DACL to prevent everybody kill process without Debug Priveleges
To modify the Discretionary Access Control List (DACL) in Windows to prevent everybody from killing a process without debug privileges, you can use the Windows API functions and structures. Here's an example of how you can achieve this in C++ using the Windows API:
cpp#include <iostream>
#include <windows.h>
#include <sddl.h>
int main()
{
DWORD processId = 1234; // Replace with the actual process ID
HANDLE processHandle = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_SET_INFORMATION, FALSE, processId);
if (processHandle == NULL)
{
std::cout << "Failed to open process. Error code: " << GetLastError() << std::endl;
return 1;
}
// Get the current process DACL
PACL oldDacl;
PSECURITY_DESCRIPTOR securityDescriptor;
if (!GetSecurityInfo(processHandle, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION,
NULL, NULL, &oldDacl, NULL, &securityDescriptor))
{
std::cout << "Failed to get security information. Error code: " << GetLastError() << std::endl;
CloseHandle(processHandle);
return 1;
}
// Create a new DACL that allows only debug privileges to terminate the process
PACL newDacl;
if (!InitializeAcl(&newDacl, sizeof(ACL), ACL_REVISION))
{
std::cout << "Failed to initialize new DACL. Error code: " << GetLastError() << std::endl;
LocalFree(securityDescriptor);
CloseHandle(processHandle);
return 1;
}
// Add an ACE that allows debug privileges to the new DACL
SID_IDENTIFIER_AUTHORITY authority = SECURITY_NT_AUTHORITY;
PSID debugSid;
if (!AllocateAndInitializeSid(&authority, 2, SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &debugSid))
{
std::cout << "Failed to allocate and initialize SID. Error code: " << GetLastError() << std::endl;
LocalFree(securityDescriptor);
CloseHandle(processHandle);
return 1;
}
if (!AddAccessAllowedAce(newDacl, ACL_REVISION, PROCESS_TERMINATE, debugSid))
{
std::cout << "Failed to add access allowed ACE. Error code: " << GetLastError() << std::endl;
LocalFree(debugSid);
LocalFree(securityDescriptor);
CloseHandle(processHandle);
return 1;
}
// Set the new DACL on the process
if (!SetSecurityInfo(processHandle, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION,
NULL, NULL, newDacl, NULL))
{
std::cout << "Failed to set security information. Error code: " << GetLastError() << std::endl;
LocalFree(debugSid);
LocalFree(securityDescriptor);
CloseHandle(processHandle);
return 1;
}
std::cout << "DACL modified successfully." << std::endl;
// Clean up resources
LocalFree(debugSid);
LocalFree(securityDescriptor);
CloseHandle(processHandle);
return 0;
}
In this example, replace 1234
with the actual process ID of the process for which you want to modify the DACL. The code opens a handle to the process using the OpenProcess
function with the necessary access rights (PROCESS_QUERY_INFORMATION
and PROCESS_SET_INFORMATION
).
Then, it uses the GetSecurityInfo
function to retrieve the current security descriptor and DACL of the process.
Next, a new DACL is created using the InitializeAcl
function. It allocates and initializes a security identifier (SID) for the debug privileges group using the AllocateAndInitializeSid
function. The debug SID is then added to the new DACL as an access-allowed ACE using the AddAccessAllowedAce
function.
Finally, the new DACL is set on the process using the SetSecurityInfo
function.
Note that modifying the DACL of a process requires appropriate permissions. Ensure that you are running the program with administrative privileges or as a user with the necessary permissions.
This example demonstrates how to modify the DACL using the Windows API in C++. The approach may differ depending on the programming language and platform you are using.