forked from Qortal/Brooklyn
206 lines
7.6 KiB
Python
206 lines
7.6 KiB
Python
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"""
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pagent_proxy_to_gpg.py - Connect gpg-agent as Pagent
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Copyright (C) 2013 Free Software Initiative of Japan
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Author: NIIBE Yutaka <gniibe@fsij.org>
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This file is a part of Gnuk, a GnuPG USB Token implementation.
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Gnuk is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gnuk is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import os, sys, re, hashlib, binascii
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from struct import *
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from gpg_agent import gpg_agent
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from sexp import sexp
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# Assume it's only OPENPGP.3 key and it's 2048-bit
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def debug(string):
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print "DEBUG: %s" % string
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sys.stdout.flush()
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def get_keygrip_list(keyinfo_result):
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kl_str = keyinfo_result[0:-1] # Chop last newline
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kl = kl_str.split('\n')
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# filter by "OPENPGP.3", and only keygrip
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return [kg.split(' ')[0] for kg in kl if re.search("OPENPGP\\.3", kg)]
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# Connect GPG-Agent, and get list of KEYGRIPs.
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g = gpg_agent()
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g.read_line() # Greeting message
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g.send_command('KEYINFO --list --data\n')
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keyinfo_result = g.get_response()
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keygrip_list = get_keygrip_list(keyinfo_result)
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debug(keygrip_list)
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keylist = []
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# For each KEYGRIP, get its PUBLIC-KEY.
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for kg in keygrip_list:
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g.send_command('READKEY %s\n' % kg)
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key = sexp(g.get_response())
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# [ "public-key" [ "rsa" [ "n" MODULUS ] [ "e" EXPONENT] ] ]
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n = key[1][1][1]
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e = key[1][2][1]
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debug(binascii.hexlify(n))
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debug(binascii.hexlify(e))
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keylist.append([n, e, kg])
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# FIXME: should handle all keys, not only a single key
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# FIXME: should support different key size
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n = keylist[0][0]
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e = keylist[0][1]
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keygrip = keylist[0][2]
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ssh_rsa_public_blob = "\x00\x00\x00\x07ssh-rsa" + \
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"\x00\x00\x00\x03" + e + "\x00\x00\x01\x01" + n
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ssh_key_comment = "key_on_gpg" # XXX: get login from card for comment?
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import win32con, win32api, win32gui, ctypes, ctypes.wintypes
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# For WM_COPYDATA structure
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class COPYDATA(ctypes.Structure):
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_fields_ = [ ('dwData', ctypes.wintypes.LPARAM),
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('cbData', ctypes.wintypes.DWORD),
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('lpData', ctypes.c_void_p) ]
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P_COPYDATA = ctypes.POINTER(COPYDATA)
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class SSH_MSG_HEAD(ctypes.BigEndianStructure):
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_pack_ = 1
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_fields_ = [ ('msg_len', ctypes.c_uint32),
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('msg_type', ctypes.c_byte) ]
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P_SSH_MSG_HEAD = ctypes.POINTER(SSH_MSG_HEAD)
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class SSH_MSG_ID_ANSWER_HEAD(ctypes.BigEndianStructure):
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_pack_ = 1
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_fields_ = [ ('msg_len', ctypes.c_uint32),
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('msg_type', ctypes.c_byte),
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('keys', ctypes.c_uint32)]
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P_SSH_MSG_ID_ANSWER = ctypes.POINTER(SSH_MSG_ID_ANSWER_HEAD)
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class SSH_MSG_SIGN_RESPONSE_HEAD(ctypes.BigEndianStructure):
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_pack_ = 1
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_fields_ = [ ('msg_len', ctypes.c_uint32),
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('msg_type', ctypes.c_byte),
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('sig_len', ctypes.c_uint32)]
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P_SSH_MSG_SIGN_RESPONSE = ctypes.POINTER(SSH_MSG_SIGN_RESPONSE_HEAD)
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FILE_MAP_ALL_ACCESS=0x000F001F
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class windows_ipc_listener(object):
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def __init__(self):
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message_map = { win32con.WM_COPYDATA: self.OnCopyData }
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wc = win32gui.WNDCLASS()
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wc.lpfnWndProc = message_map
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wc.lpszClassName = 'Pageant'
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hinst = wc.hInstance = win32api.GetModuleHandle(None)
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classAtom = win32gui.RegisterClass(wc)
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self.hwnd = win32gui.CreateWindow (
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classAtom,
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"Pageant",
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0,
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0,
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0,
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win32con.CW_USEDEFAULT,
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win32con.CW_USEDEFAULT,
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0,
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0,
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hinst,
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None
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)
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debug("created: window=%08x" % self.hwnd)
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def OnCopyData(self, hwnd, msg, wparam, lparam):
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debug("WM_COPYDATA message")
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debug(" window=%08x" % hwnd)
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debug(" msg =%08x" % msg)
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debug(" wparam=%08x" % wparam)
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pCDS = ctypes.cast(lparam, P_COPYDATA)
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debug(" dwData=%08x" % (pCDS.contents.dwData & 0xffffffff))
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debug(" len=%d" % pCDS.contents.cbData)
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mapname = ctypes.string_at(pCDS.contents.lpData)
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debug(" mapname='%s'" % ctypes.string_at(pCDS.contents.lpData))
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hMapObject = ctypes.windll.kernel32.OpenFileMappingA(FILE_MAP_ALL_ACCESS, 0, mapname)
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if hMapObject == 0:
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debug("error on OpenFileMapping")
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return 0
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pBuf = ctypes.windll.kernel32.MapViewOfFile(hMapObject, FILE_MAP_ALL_ACCESS, 0, 0, 0)
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if pBuf == 0:
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ctypes.windll.kernel32.CloseHandle(hMapObject)
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debug("error on MapViewOfFile")
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return 0
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pSshMsg = ctypes.cast(pBuf, P_SSH_MSG_HEAD)
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debug(" ssh_msg_len: %d" % pSshMsg.contents.msg_len)
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debug(" ssh_msg_type: %d" % pSshMsg.contents.msg_type)
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if pSshMsg.contents.msg_type == 11: # SSH2_AGENT_REQUEST_IDENTITIES
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blob_len = len(ssh_rsa_public_blob)
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cmnt_len = len(ssh_key_comment)
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pAns = ctypes.cast(pBuf, P_SSH_MSG_ID_ANSWER)
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pAns.contents.msg_len = 1+4+4+blob_len+4+cmnt_len
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pAns.contents.msg_type = 12 # SSH2_AGENT_IDENTITIES_ANSWER
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pAns.contents.keys = 1
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ctypes.memmove(pBuf+4+1+4, pack('>I', blob_len), 4)
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ctypes.memmove(pBuf+4+1+4+4, ssh_rsa_public_blob, blob_len)
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ctypes.memmove(pBuf+4+1+4+4+blob_len, pack('>I', cmnt_len), 4)
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ctypes.memmove(pBuf+4+1+4+4+blob_len+4, ssh_key_comment, cmnt_len)
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debug("answer is:")
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debug(" ssh_msg_len: %d" % pSshMsg.contents.msg_len)
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debug(" ssh_msg_type: %d" % pSshMsg.contents.msg_type)
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elif pSshMsg.contents.msg_type == 13: # SSH2_AGENT_SIGN_REQUEST
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req_blob_len = unpack(">I", ctypes.string_at(pBuf+5, 4))[0]
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req_blob = ctypes.string_at(pBuf+5+4, req_blob_len)
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req_data_len = unpack(">I", ctypes.string_at(pBuf+5+4+req_blob_len,4))[0]
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req_data = ctypes.string_at(pBuf+5+4+req_blob_len+4,req_data_len)
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debug(" blob_len=%d" % req_blob_len)
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debug(" data_len=%d" % req_data_len)
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hash = hashlib.sha1(req_data).hexdigest()
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debug(" hash=%s" % hash)
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g.send_command('SIGKEY %s\n' % keygrip)
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g.send_command('SETHASH --hash=sha1 %s\n' % hash)
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g.send_command('PKSIGN\n')
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sig = sexp(g.get_response())
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# [ "sig-val" [ "rsa" [ "s" "xxx" ] ] ]
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sig = sig[1][1][1]
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sig = "\x00\x00\x00\x07" + "ssh-rsa" + "\x00\x00\x01\x00" + sig # FIXME: should support different key size
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siglen = len(sig)
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debug("sig_len=%d" % siglen)
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debug("sig=%s" % binascii.hexlify(sig))
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pRes = ctypes.cast(pBuf, P_SSH_MSG_SIGN_RESPONSE)
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pRes.contents.msg_len = 1+4+siglen
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pRes.contents.msg_type = 14 # SSH2_AGENT_SIGN_RESPONSE
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pRes.contents.sig_len = siglen
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ctypes.memmove(pBuf+4+1+4, sig, siglen)
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debug("answer is:")
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debug(" ssh_msg_len: %d" % pSshMsg.contents.msg_len)
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debug(" ssh_msg_type: %d" % pSshMsg.contents.msg_type)
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else:
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exit(0)
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ctypes.windll.kernel32.UnmapViewOfFile(pBuf)
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ctypes.windll.kernel32.CloseHandle(hMapObject)
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debug(" ssh_msg: done")
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return 1
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l = windows_ipc_listener()
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win32gui.PumpMessages()
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