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# Copyright (C) 2005 John Arbash-Meinel <john@arbash-meinel.com>
# Modified up by: Todd Whiteman <ToddW@ActiveState.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
"""
Functions for communicating with Pageant, the basic windows ssh agent program.
"""
import array
import ctypes.wintypes
import platform
import struct
from paramiko.util import *
try:
import _thread as thread # Python 3.x
except ImportError:
import thread # Python 2.5-2.7
from . import _winapi
_AGENT_COPYDATA_ID = 0x804e50ba
_AGENT_MAX_MSGLEN = 8192
# Note: The WM_COPYDATA value is pulled from win32con, as a workaround
# so we do not have to import this huge library just for this one variable.
win32con_WM_COPYDATA = 74
def _get_pageant_window_object():
return ctypes.windll.user32.FindWindowA('Pageant', 'Pageant')
def can_talk_to_agent():
"""
Check to see if there is a "Pageant" agent we can talk to.
This checks both if we have the required libraries (win32all or ctypes)
and if there is a Pageant currently running.
"""
return bool(_get_pageant_window_object())
ULONG_PTR = ctypes.c_uint64 if platform.architecture()[0] == '64bit' else ctypes.c_uint32
class COPYDATASTRUCT(ctypes.Structure):
"""
ctypes implementation of
http://msdn.microsoft.com/en-us/library/windows/desktop/ms649010%28v=vs.85%29.aspx
"""
_fields_ = [
('num_data', ULONG_PTR),
('data_size', ctypes.wintypes.DWORD),
('data_loc', ctypes.c_void_p),
]
def _query_pageant(msg):
"""
Communication with the Pageant process is done through a shared
memory-mapped file.
"""
hwnd = _get_pageant_window_object()
if not hwnd:
# Raise a failure to connect exception, pageant isn't running anymore!
return None
# create a name for the mmap
map_name = 'PageantRequest%08x' % thread.get_ident()
pymap = _winapi.MemoryMap(map_name, _AGENT_MAX_MSGLEN,
_winapi.get_security_attributes_for_user(),
)
with pymap:
pymap.write(msg)
# Create an array buffer containing the mapped filename
char_buffer = array.array("c", b(map_name) + zero_byte)
char_buffer_address, char_buffer_size = char_buffer.buffer_info()
# Create a string to use for the SendMessage function call
cds = COPYDATASTRUCT(_AGENT_COPYDATA_ID, char_buffer_size,
char_buffer_address)
response = ctypes.windll.user32.SendMessageA(hwnd,
win32con_WM_COPYDATA, ctypes.sizeof(cds), ctypes.byref(cds))
if response > 0:
pymap.seek(0)
datalen = pymap.read(4)
retlen = struct.unpack('>I', datalen)[0]
return datalen + pymap.read(retlen)
return None
class PageantConnection(object):
"""
Mock "connection" to an agent which roughly approximates the behavior of
a unix local-domain socket (as used by Agent). Requests are sent to the
pageant daemon via special Windows magick, and responses are buffered back
for subsequent reads.
"""
def __init__(self):
self._response = None
def send(self, data):
self._response = _query_pageant(data)
def recv(self, n):
if self._response is None:
return ''
ret = self._response[:n]
self._response = self._response[n:]
if self._response == '':
self._response = None
return ret
def close(self):
pass
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