Module: Net::SSH::Authentication::Pageant::Win

Extended by:
DL::Importable, DL::Importer
Includes:
DL::Win32Types
Defined in:
lib/net/ssh/authentication/pageant.rb

Overview

The definition of the Windows methods and data structures used in communicating with the pageant process.

Constant Summary collapse

SIZEOF_DWORD = 
DL::SIZEOF_LONG
INVALID_HANDLE_VALUE =

From winbase.h, winnt.h

-1
NULL = 
nil
PAGE_READWRITE = 
0x0004
FILE_MAP_WRITE = 
2
WM_COPYDATA = 
74
SMTO_NORMAL =

From winuser.h

0
TOKEN_QUERY =

Constants needed for security attribute retrieval. Specifies the access mask corresponding to the desired access rights.

0x8
TOKEN_USER_INFORMATION_CLASS =

The value of TOKEN_USER from the TOKEN_INFORMATION_CLASS enum.

1
REVISION =

The initial revision level assigned to the security descriptor.

1
TOKEN_USER =

Structs for security attribute functions. Holds the retrieved user access token.

struct ['void * SID', 'DWORD ATTRIBUTES']
SECURITY_ATTRIBUTES =

Contains the security descriptor, this gets passed to the function that constructs the shared memory map.

struct ['DWORD nLength',
'LPVOID lpSecurityDescriptor',
'BOOL bInheritHandle']
SECURITY_DESCRIPTOR =

The security descriptor holds security information.

struct ['UCHAR Revision', 'UCHAR Sbz1',
'USHORT Control', 'LPVOID Owner',
'LPVOID Group', 'LPVOID Sacl',
'LPVOID Dacl']

Class Method Summary collapse

Class Method Details

.get_cstr(str) ⇒ Object

Get a null-terminated string given a string.



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# File 'lib/net/ssh/authentication/pageant.rb', line 261

def self.get_cstr(str)
  return str + "\000"
end

.get_current_user ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 210

def self.get_current_user
  token_handle = open_process_token(Win.GetCurrentProcess,
                                    Win::TOKEN_QUERY)
  token_user =  get_token_information(token_handle,
                  Win::TOKEN_USER_INFORMATION_CLASS)
  return token_user
end

.get_ptr(data) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 167

def self.get_ptr(data)
  return data.to_ptr
end

.get_security_attributes_for_user ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 188

def self.get_security_attributes_for_user
  user = get_current_user

  psd_information = malloc_ptr(Win::SECURITY_DESCRIPTOR.size)
  raise_error_if_zero(
    Win.InitializeSecurityDescriptor(psd_information,
                                     Win::REVISION))
  raise_error_if_zero(
    Win.SetSecurityDescriptorOwner(psd_information, user.SID,
                                   0))
  raise_error_if_zero(
    Win.IsValidSecurityDescriptor(psd_information))

  nLength = Win::SECURITY_ATTRIBUTES.size
  lpSecurityDescriptor = psd_information
  bInheritHandle = 1
  sa = [nLength, lpSecurityDescriptor.to_i,
        bInheritHandle].pack("LLC")

  return sa
end

.get_token_information(token_handle, token_information_class) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 229

def self.get_token_information(token_handle,
                               token_information_class)
  # Hold the size of the information to be returned
  preturn_length = malloc_ptr(Win::SIZEOF_DWORD)

  # Going to throw an INSUFFICIENT_BUFFER_ERROR, but that is ok
  # here. This is retrieving the size of the information to be
  # returned.
  Win.GetTokenInformation(token_handle,
                          token_information_class,
                          Win::NULL, 0, preturn_length)
  ptoken_information = malloc_ptr(preturn_length.ptr.to_i)

  # This call is going to write the requested information to
  # the memory location referenced by token_information.
  raise_error_if_zero(
    Win.GetTokenInformation(token_handle,
                            token_information_class,
                            ptoken_information,
                            ptoken_information.size,
                            preturn_length))

  return TOKEN_USER.new(ptoken_information)
end

.malloc_ptr(size) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 163

def self.malloc_ptr(size)
  return DL.malloc(size)
end

.open_process_token(process_handle, desired_access) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 218

def self.open_process_token(process_handle, desired_access)
  ptoken_handle = malloc_ptr(Win::SIZEOF_DWORD)

  raise_error_if_zero(
    Win.OpenProcessToken(process_handle, desired_access,
                         ptoken_handle))
  token_handle = ptoken_handle.ptr.to_i

  return token_handle
end

.raise_error_if_zero(result) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 254

def self.raise_error_if_zero(result)
  if result == 0
    raise "Windows error: #{Win.GetLastError}"
  end
end

.set_ptr_data(ptr, data) ⇒ Object 



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# File 'lib/net/ssh/authentication/pageant.rb', line 171

def self.set_ptr_data(ptr, data)
  ptr[0] = data
end