Method: Win32::Security::SID#initialize

Defined in:

lib/win32/security/sid.rb

#initialize(account = nil, host = Socket.gethostname) ⇒ SID

Creates and returns a new Win32::Security::SID object, based on the account name, which may also be a binary SID. If a host is provided, then the information is retrieved from that host. Otherwise, the local host is used.

If no account is provided then it retrieves information for the user account associated with the calling thread and the host argument is ignored.

Note that this does NOT create a new SID, but merely retrieves information for an existing SID. To create a new SID, use the SID.create method.

Examples:

# Current user
Win32::Security::SID.new

# User 'john' on the localhost
Win32::Security::SID.new('john')

# User 'jane' on a remote machine
Win32::Security::SID.new('jane', 'some_host')

# Binary SID
Win32::Security::SID.new("\001\000\000\000\000\000\001\000\000\000\000")

# File 'lib/win32/security/sid.rb', line 172

def initialize(account=nil, host=Socket.gethostname)
  if account.nil?
    begin
      ptoken = FFI::MemoryPointer.new(:ulong)

      # Try the thread token first, default to the process token.
      bool = OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, true, ptoken)

      if !bool && FFI.errno != ERROR_NO_TOKEN
        raise SystemCallError.new("OpenThreadToken", FFI.errno)
      else
        ptoken = FFI::MemoryPointer.new(:ulong)
        unless OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, ptoken)
          raise SystemCallError.new("OpenProcessToken", FFI.errno)
        end
      end

      token = ptoken.read_ulong
      pinfo = FFI::MemoryPointer.new(:pointer)
      plength = FFI::MemoryPointer.new(:ulong)

      # First pass, just get the size needed (1 is TokenOwner)
      GetTokenInformation(token, 1, pinfo, pinfo.size, plength)

      pinfo = FFI::MemoryPointer.new(plength.read_ulong)
      plength = FFI::MemoryPointer.new(:ulong)

      # Second pass, actual call (1 is TokenOwner)
      unless GetTokenInformation(token, 1, pinfo, pinfo.size, plength)
        raise SystemCallError.new("GetTokenInformation", FFI.errno)
      end

      token_info = pinfo.read_pointer
    ensure
      CloseHandle(token) if token
    end
  end

  if account
    ordinal_val = account[0]
    ordinal_val = ordinal_val.ord if RUBY_VERSION.to_f >= 1.9
  else
    ordinal_val = nil
  end

  sid = FFI::MemoryPointer.new(:uchar, 260)
  sid_size = FFI::MemoryPointer.new(:ulong)
  sid_size.write_ulong(sid.size)

  domain = FFI::MemoryPointer.new(:uchar, 260)
  domain_size = FFI::MemoryPointer.new(:ulong)
  domain_size.write_ulong(domain.size)

  use_ptr = FFI::MemoryPointer.new(:ulong)

  if ordinal_val.nil?
    bool = LookupAccountSid(
      nil,
      token_info,
      sid,
      sid_size,
      domain,
      domain_size,
      use_ptr
    )
    unless bool
      raise SystemCallError.new("LookupAccountSid", FFI.errno)
    end
  elsif ordinal_val < 10 # Assume it's a binary SID.
    account_ptr = FFI::MemoryPointer.from_string(account)
    bool = LookupAccountSid(
      host,
      account_ptr,
      sid,
      sid_size,
      domain,
      domain_size,
      use_ptr
    )
    unless bool
      raise SystemCallError.new("LookupAccountSid", FFI.errno)
    end
  else
    bool = LookupAccountName(
      host,
      account,
      sid,
      sid_size,
      domain,
      domain_size,
      use_ptr
    )
    unless bool
      raise SystemCallError.new("LookupAccountName", FFI.errno)
    end
  end

  # The arguments are flipped depending on which path we took
  if ordinal_val.nil?
    @sid = token_info.read_string
    @account = sid.read_string(sid.size).strip
  elsif ordinal_val < 10
    @sid     = account
    @account = sid.read_string(sid.size).strip
  else
    length = GetLengthSid(sid)
    @sid     = sid.read_string(length)
    @account = account
  end

  @host   = host
  @domain = domain.read_string

  @account_type = get_account_type(use_ptr.read_ulong)
end