#include <windows.h>
#include <stdio.h>

int main() {
    // Initialize a security descriptor
    SECURITY_DESCRIPTOR securityDescriptor;
    if (!InitializeSecurityDescriptor(&securityDescriptor, SECURITY_DESCRIPTOR_REVISION)) {
        fprintf(stderr, "Failed to initialize security descriptor. Error: %lu\n", GetLastError());
        return 1;
    }

    // Create a DACL
    // Allocate memory for the DACL (size must accommodate ACEs and DACL header)
    DWORD daclSize = sizeof(ACL) +
                     3 * (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) + // Size of 3 ACEs
                     3 * SECURITY_MAX_SID_SIZE; // Maximum size for 3 SIDs
    PACL dacl = (PACL)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, daclSize);
    if (!dacl) {
        fprintf(stderr, "Failed to allocate memory for DACL. Error: %lu\n", GetLastError());
        return 1;
    }

    if (!InitializeAcl(dacl, daclSize, ACL_REVISION)) {
        fprintf(stderr, "Failed to initialize DACL. Error: %lu\n", GetLastError());
        HeapFree(GetProcessHeap(), 0, dacl);
        return 1;
    }

    // Define and create well-known SIDs
    BYTE systemSidBuffer[SECURITY_MAX_SID_SIZE];
    BYTE administratorsSidBuffer[SECURITY_MAX_SID_SIZE];
    BYTE ownerSidBuffer[SECURITY_MAX_SID_SIZE];
    DWORD sidSize = SECURITY_MAX_SID_SIZE;

    if (!CreateWellKnownSid(WinLocalSystemSid, NULL, systemSidBuffer, &sidSize) ||
        !CreateWellKnownSid(WinBuiltinAdministratorsSid, NULL, administratorsSidBuffer, &sidSize) ||
        !CreateWellKnownSid(WinCreatorOwnerSid, NULL, ownerSidBuffer, &sidSize)) {
        fprintf(stderr, "Failed to create well-known SIDs. Error: %lu\n", GetLastError());
        HeapFree(GetProcessHeap(), 0, dacl);
        return 1;
    }

    // Add ACEs to the DACL
    if (!AddAccessAllowedAceEx(dacl, ACL_REVISION, OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE, GENERIC_ALL, (PSID)systemSidBuffer) ||
        !AddAccessAllowedAceEx(dacl, ACL_REVISION, OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE, GENERIC_ALL, (PSID)administratorsSidBuffer) ||
        !AddAccessAllowedAceEx(dacl, ACL_REVISION, OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE, GENERIC_ALL, (PSID)ownerSidBuffer)) {
        fprintf(stderr, "Failed to add ACE to DACL. Error: %lu\n", GetLastError());
        HeapFree(GetProcessHeap(), 0, dacl);
        return 1;
    }

    // Set the DACL in the security descriptor
    if (!SetSecurityDescriptorDacl(&securityDescriptor, TRUE, dacl, FALSE)) {
        fprintf(stderr, "Failed to set DACL in security descriptor. Error: %lu\n", GetLastError());
        HeapFree(GetProcessHeap(), 0, dacl);
        return 1;
    }

    // Security descriptor successfully initialized
    printf("Security descriptor successfully initialized.\n");

    // Clean up
    HeapFree(GetProcessHeap(), 0, dacl);

    return 0;
}