/// <summary>
/// Retrieves a list of the members of a particular local group in the security database.
/// </summary>
/// <param name="GroupName">
/// The name of the local group whose members are to be listed.
/// </param>
/// <returns>
/// Returns an array of security identifiers (SIDs), each representing a group member.
/// </returns>
private static SecurityIdentifier[] GetLocalGroupMembers(string GroupName)
{
SecurityIdentifier[] returnValue = null;
IntPtr buffer = IntPtr.Zero;
IntPtr Resume = IntPtr.Zero;
int val = NativeMethods.NetLocalGroupGetMembers(null, GroupName, 0, out buffer, -1, out int EntriesRead, out int TotalEntries, Resume);
if (EntriesRead > 0)
{
returnValue = new SecurityIdentifier[EntriesRead];
NativeMethods.LOCALGROUP_MEMBERS_INFO_0[] Members = new NativeMethods.LOCALGROUP_MEMBERS_INFO_0[EntriesRead];
IntPtr iter = buffer;
for (int i = 0; i < EntriesRead; i++)
{
Members[i] = (NativeMethods.LOCALGROUP_MEMBERS_INFO_0)System.Runtime.InteropServices.Marshal.PtrToStructure(iter, typeof(NativeMethods.LOCALGROUP_MEMBERS_INFO_0));
iter = (IntPtr)((long)iter + System.Runtime.InteropServices.Marshal.SizeOf(typeof(NativeMethods.LOCALGROUP_MEMBERS_INFO_0)));
if (Members[i].lgrmi0_sid != IntPtr.Zero)
{
SecurityIdentifier sid = new SecurityIdentifier(Members[i].lgrmi0_sid);
returnValue[i] = sid;
}
else
{
returnValue[i] = null;
}
}
NativeMethods.NetApiBufferFree(buffer);
}
return(returnValue);
}
/// <summary>
/// Removes a security identifier (SID) from a local security group.
/// </summary>
/// <param name="GroupName">
/// The name of the group from which the SID is to be removed.
/// </param>
/// <param name="memberSid">
/// The security identifier (SID) to be removed from the local group.
/// </param>
/// <returns>
/// If the removal of the group member is successful, this function returns
/// zero (0). Otherwise, a non-zero value is returned.
/// </returns>
private static int RemoveLocalGroupMembers(string GroupName, SecurityIdentifier memberSid)
{
int returnValue = -1;
NativeMethods.LOCALGROUP_MEMBERS_INFO_0 memberInfo = new NativeMethods.LOCALGROUP_MEMBERS_INFO_0();
byte[] binarySid = new byte[memberSid.BinaryLength];
memberSid.GetBinaryForm(binarySid, 0);
IntPtr unmanagedPointer = System.Runtime.InteropServices.Marshal.AllocHGlobal(binarySid.Length);
System.Runtime.InteropServices.Marshal.Copy(binarySid, 0, unmanagedPointer, binarySid.Length);
memberInfo.lgrmi0_sid = unmanagedPointer;
returnValue = NativeMethods.NetLocalGroupDelMembers(null, GroupName, 0, ref memberInfo, 1);
System.Runtime.InteropServices.Marshal.FreeHGlobal(unmanagedPointer);
return(returnValue);
}