--- /dev/null
+#!/usr/bin/env python
+#
+# Copyright (C) 2011 W. Trevor King <wking@drexel.edu>
+#
+# This program 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 3 of the
+# License, or (at your option) any later version.
+#
+# This program 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 this program. If not, see
+# <http://www.gnu.org/licenses/>.
+
+"""Simple pinentry program for getting pins from a terminal.
+"""
+
+import copy
+import logging
+import os
+import os.path
+import pprint
+import re
+import signal
+import sys
+import termios
+import traceback
+
+
+# create logger
+logger = logging.getLogger('pinentry')
+logger.setLevel(logging.WARNING)
+_h = logging.FileHandler('/tmp/pinentry.log')
+_h.setLevel(logging.DEBUG)
+_f = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+_h.setFormatter(_f)
+logger.addHandler(_h)
+del _h, _f
+
+
+class PinEntry (object):
+ """pinentry protocol server
+
+ See the `Assuan manual`_ for a description of the protocol.
+
+ .. _Assuan manual: http://www.gnupg.org/documentation/manuals/assuan/
+ """
+ _digit_regexp = re.compile(r'\d+')
+
+ # from proc(5): pid comm state ppid pgrp session tty_nr tpgid
+ _tpgrp_regexp = re.compile(r'\d+ \(\S+\) . \d+ \d+ \d+ \d+ (\d+)')
+
+ _assuan_encode_regexp = re.compile(
+ '(' + '|'.join(['%', '\r', '\n']) + ')')
+ _assuan_decode_regexp = re.compile('(%[0-9A-F]{2})')
+
+ def __init__(self):
+ self.stop = False
+ self.options = {}
+ self.strings = {}
+ self.connection = {}
+
+ def run(self):
+ logger.info('---opening pinentry---')
+ logger.info('OK Your orders please')
+ sys.stdout.write('OK Your orders please\n')
+ sys.stdout.flush()
+ try:
+ while not self.stop:
+ line = sys.stdin.readline()
+ if not line:
+ break # EOF
+ line = line.rstrip() # dangerous?
+ logger.info(line)
+ line = self._decode(line)
+ fields = line.split(' ', 1)
+ cmd = fields[0]
+ if len(fields) > 1:
+ arg = fields[1]
+ else:
+ arg = None
+ handle = getattr(self, '_handle_%s' % cmd, None)
+ if handle:
+ for response in handle(arg):
+ response = self._encode(response)
+ logger.info(response)
+ sys.stdout.write(response+'\n')
+ try:
+ sys.stdout.flush()
+ except IOError:
+ if not self.stop:
+ raise
+ else:
+ raise ValueError(line)
+ finally:
+ logger.info('---closing pinentry---')
+
+ # user interface
+
+ def _connect(self):
+ logger.info('--connecting to user--')
+ logger.debug('options:\n%s' % pprint.pformat(self.options))
+ tty_name = self.options.get('ttyname', None)
+ if tty_name:
+ self.connection['tpgrp'] = self._get_pgrp(tty_name)
+ logger.info('open to-user output stream for %s' % tty_name)
+ self.connection['to_user'] = open(tty_name, 'w')
+ logger.info('open from-user input stream for %s' % tty_name)
+ self.connection['from_user'] = open(tty_name, 'r')
+ logger.info('get current termios line discipline')
+ self.connection['original termios'] = termios.tcgetattr(
+ self.connection['to_user']) # [iflag, oflag, cflag, lflag, ...]
+ new_termios = copy.deepcopy(self.connection['original termios'])
+ # translate carriage return to newline on input
+ new_termios[0] |= termios.ICRNL
+ # do not ignore carriage return on input
+ new_termios[0] &= ~termios.IGNCR
+ # do not echo input characters
+ new_termios[3] &= ~termios.ECHO
+ # echo input characters
+ #new_termios[3] |= termios.ECHO
+ # echo the NL character even if ECHO is not set
+ new_termios[3] |= termios.ECHONL
+ # enable canonical mode
+ new_termios[3] |= termios.ICANON
+ logger.info('adjust termios line discipline')
+ termios.tcsetattr(
+ self.connection['to_user'], termios.TCSANOW, new_termios)
+ logger.info('send SIGSTOP to pgrp %d' % self.connection['tpgrp'])
+ #os.killpg(self.connection['tpgrp'], signal.SIGSTOP)
+ os.kill(-self.connection['tpgrp'], signal.SIGSTOP)
+ self.connection['tpgrp stopped'] = True
+ else:
+ logger.info('no TTY name given; use stdin/stdout for I/O')
+ self.connection['to_user'] = sys.stdout
+ self.connection['from_user'] = sys.stdin
+ logger.info('--connected to user--')
+ self.connection['to_user'].write('\n') # give a clean line to work on
+ self.connection['active'] = True
+
+ def _disconnect(self):
+ logger.info('--disconnecting from user--')
+ try:
+ if self.connection.get('original termios', None):
+ logger.info('restore original termios line discipline')
+ termios.tcsetattr(
+ self.connection['to_user'], termios.TCSANOW,
+ self.connection['original termios'])
+ if self.connection.get('tpgrp stopped', None) is True:
+ logger.info(
+ 'send SIGCONT to pgrp %d' % self.connection['tpgrp'])
+ #os.killpg(self.connection['tpgrp'], signal.SIGCONT)
+ os.kill(-self.connection['tpgrp'], signal.SIGCONT)
+ if self.connection.get('to_user', None) not in [None, sys.stdout]:
+ logger.info('close to-user output stream')
+ self.connection['to_user'].close()
+ if self.connection.get('from_user', None) not in [None,sys.stdout]:
+ logger.info('close from-user input stream')
+ self.connection['from_user'].close()
+ finally:
+ self.connection = {'active': False}
+ logger.info('--disconnected from user--')
+
+ def _get_pgrp(self, tty_name):
+ logger.info('find process group contolling %s' % tty_name)
+ proc = '/proc'
+ for name in os.listdir(proc):
+ path = os.path.join(proc, name)
+ if not (self._digit_regexp.match(name) and os.path.isdir(path)):
+ continue # not a process directory
+ logger.debug('checking process %s' % name)
+ fd_path = os.path.join(path, 'fd', '0')
+ try:
+ link = os.readlink(fd_path)
+ except OSError, e:
+ logger.debug('not our process: %s' % e)
+ continue # permission denied (not one of our processes)
+ if link != tty_name:
+ logger.debug('wrong tty: %s' % link)
+ continue # not attached to our target tty
+ stat_path = os.path.join(path, 'stat')
+ stat = open(stat_path, 'r').read()
+ logger.debug('check stat for pgrp: %s' % stat)
+ match = self._tpgrp_regexp.match(stat)
+ assert match != None, stat
+ pgrp = int(match.group(1))
+ logger.info('found pgrp %d for %s' % (pgrp, tty_name))
+ return pgrp
+ raise ValueError(tty_name)
+
+ def _write(self, string):
+ "Write text to the user's terminal."
+ self.connection['to_user'].write(string + '\n')
+ self.connection['to_user'].flush()
+
+ def _read(self):
+ "Read and return a line from the user's terminal."
+ # drop trailing newline
+ return self.connection['from_user'].readline()[:-1]
+
+ def _prompt(self, prompt='?', add_colon=True):
+ if add_colon:
+ prompt += ':'
+ self.connection['to_user'].write('%s ' % prompt)
+ self.connection['to_user'].flush()
+ return self._read()
+
+ # Assuan utilities
+
+ def _encode(self, string):
+ """
+
+ >>> p = PinEntry()
+ >>> p._encode('It grew by 5%!\\n')
+ 'It grew by 5%25!%0A'
+ """
+ return self._assuan_encode_regexp.sub(
+ lambda x : self._to_hex(x.group()), string)
+
+ def _decode(self, string):
+ """
+
+ >>> p = PinEntry()
+ >>> p._decode('%22Look out!%22%0AWhere%3F')
+ '"Look out!"\\nWhere?'
+ """
+ return self._assuan_decode_regexp.sub(
+ lambda x : self._from_hex(x.group()), string)
+
+ def _from_hex(self, code):
+ """
+
+ >>> p = PinEntry()
+ >>> p._from_hex('%22')
+ '"'
+ >>> p._from_hex('%0A')
+ '\\n'
+ """
+ return chr(int(code[1:], 16))
+
+ def _to_hex(self, char):
+ """
+
+ >>> p = PinEntry()
+ >>> p._to_hex('"')
+ '%22'
+ >>> p._to_hex('\\n')
+ '%0A'
+ """
+ return '%%%02X' % ord(char)
+
+ # handlers
+
+ def _handle_BYE(self, arg):
+ self.stop = True
+ yield 'OK closing connection'
+
+ def _handle_OPTION(self, arg):
+ # ttytype to set TERM
+ fields = arg.split('=', 1)
+ key = fields[0]
+ if len(fields) > 1:
+ value = fields[1]
+ else:
+ value = True
+ self.options[key] = value
+ yield 'OK'
+
+ def _handle_GETINFO(self, arg):
+ if arg == 'pid':
+ yield 'D %d' % os.getpid()
+ else:
+ raise ValueError(arg)
+ yield 'OK'
+
+ def _handle_SETDESC(self, arg):
+ self.strings['description'] = arg
+ yield 'OK'
+
+ def _handle_SETPROMPT(self, arg):
+ self.strings['prompt'] = arg
+ yield 'OK'
+
+ def _handle_SETERROR(self, arg):
+ self.strings['error'] = arg
+ yield 'OK'
+
+ def _handle_SETTITLE(self, arg):
+ self.strings['title'] = arg
+ yield 'OK'
+
+ def _handle_SETOK(self, arg):
+ self.strings['ok'] = arg
+ yield 'OK'
+
+ def _handle_SETCANCEL(self, arg):
+ self.strings['cancel'] = arg
+ yield 'OK'
+
+ def _handle_SETNOTOK(self, arg):
+ self.strings['not ok'] = arg
+ yield 'OK'
+
+ def _handle_SETQUALITYBAR(self, arg):
+ """Adds a quality indicator to the GETPIN window. This
+ indicator is updated as the passphrase is typed. The clients
+ needs to implement an inquiry named "QUALITY" which gets passed
+ the current passpharse (percent-plus escaped) and should send
+ back a string with a single numerical vauelue between -100 and
+ 100. Negative values will be displayed in red.
+
+ If a custom label for the quality bar is required, just add that
+ label as an argument as percent escaped string. You will need
+ this feature to translate the label because pinentry has no
+ internal gettext except for stock strings from the toolkit library.
+
+ If you want to show a tooltip for the quality bar, you may use
+ C: SETQUALITYBAR_TT string
+ S: OK
+
+ With STRING being a percent escaped string shown as the tooltip.
+ """
+ raise NotImplementedError()
+
+ def _handle_GETPIN(self, arg):
+ try:
+ self._connect()
+ self._write(self.strings['description'])
+ pin = self._prompt(self.strings['prompt'], add_colon=False)
+ finally:
+ self._disconnect()
+ yield 'D %s' % pin
+ yield 'OK'
+
+ def _handle_CONFIRM(self, arg):
+ try:
+ self._connect()
+ self._write(self.strings['description'])
+ self._write('1) '+self.strings['ok'])
+ self._write('2) '+self.strings['not ok'])
+ value = self._prompt('?')
+ finally:
+ self._disconnect()
+ if value == '1':
+ yield 'OK'
+ else:
+ yield 'ASSUAN_Not_Confirmed'
+
+ def _handle_MESSAGE(self, arg):
+ self._write(self.strings['description'])
+ yield 'OK'
+
+ def _handle_CONFIRM(self, args):
+ assert args == '--one-button', args
+ try:
+ self._connect()
+ self._write(self.strings['description'])
+ self._write('1) '+self.strings['ok'])
+ value = self._prompt('?')
+ finally:
+ self._disconnect()
+ assert value == '1', value
+ yield 'OK'
+
+
+if __name__ == '__main__':
+ try:
+ p = PinEntry()
+ p.run()
+ except:
+ logger.error('exiting due to exception:\n%s' %
+ traceback.format_exc().rstrip())
+ raise
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