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## common/GnuPG.py
##
## Contributors for this file:
## - Yann Le Boulanger <asterix@lagaule.org>
## - Nikos Kouremenos <nkour@jabber.org>
##
## Copyright (C) 2003-2005 Gajim Team
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 2 only.
##
## 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 General Public License for more details.
##
from os import tmpfile
from common import helpers
USE_GPG = True
try:
import GnuPGInterface # Debian package doesn't distribute 'our' file
except ImportError:
try:
from common import GnuPGInterface # use 'our' file
except ImportError:
USE_GPG = False # user can't do OpenGPG only if he or she removed the file!
else:
class GnuPG(GnuPGInterface.GnuPG):
def __init__(self):
GnuPGInterface.GnuPG.__init__(self)
self._setup_my_options()
def _setup_my_options(self):
self.options.armor = 1
self.options.meta_interactive = 0
self.options.extra_args.append('--no-secmem-warning')
# Nolith's patch - prevent crashs on non fully-trusted keys
self.options.extra_args.append('--always-trust')
def _read_response(self, child_stdout):
# Internal method: reads all the output from GPG, taking notice
# only of lines that begin with the magic [GNUPG:] prefix.
# (See doc/DETAILS in the GPG distribution for info on GPG's
# output when --status-fd is specified.)
#
# Returns a dictionary, mapping GPG's keywords to the arguments
# for that keyword.
resp = {}
while 1:
line = helpers.temp_failure_retry(child_stdout.readline)
if line == "": break
line = line.rstrip()
if line[0:9] == '[GNUPG:] ':
# Chop off the prefix
line = line[9:]
L = line.split(None, 1)
keyword = L[0]
if len(L) > 1:
resp[ keyword ] = L[1]
else:
resp[ keyword ] = ""
return resp
def encrypt(self, str, recipients):
if not USE_GPG:
return str
self.options.recipients = recipients # a list!
proc = self.run(['--encrypt'], create_fhs=['stdin', 'stdout'])
proc.handles['stdin'].write(str)
proc.handles['stdin'].close()
output = proc.handles['stdout'].read()
proc.handles['stdout'].close()
try: proc.wait()
except IOError: pass
return self._stripHeaderFooter(output)
def decrypt(self, str, keyID):
if not USE_GPG:
return str
proc = self.run(['--decrypt', '-q', '-u %s'%keyID], create_fhs=['stdin', 'stdout'])
enc = self._addHeaderFooter(str, 'MESSAGE')
proc.handles['stdin'].write(enc)
proc.handles['stdin'].close()
output = proc.handles['stdout'].read()
proc.handles['stdout'].close()
try: proc.wait()
except IOError: pass
return output
def sign(self, str, keyID):
if not USE_GPG:
return str
proc = self.run(['-b', '-u %s'%keyID], create_fhs=['stdin', 'stdout', 'status', 'stderr'])
proc.handles['stdin'].write(str)
try:
proc.handles['stdin'].close()
except IOError:
pass
output = proc.handles['stdout'].read()
try:
proc.handles['stdout'].close()
proc.handles['stderr'].close()
except IOError:
pass
stat = proc.handles['status']
resp = self._read_response(stat)
try:
proc.handles['status'].close()
except IOError:
pass
try: proc.wait()
except IOError: pass
if resp.has_key('GOOD_PASSPHRASE') or resp.has_key('SIG_CREATED'):
return self._stripHeaderFooter(output)
return 'BAD_PASSPHRASE'
def verify(self, str, sign):
if not USE_GPG:
return str
if not str:
return ''
f = tmpfile()
fd = f.fileno()
f.write(str)
f.seek(0)
proc = self.run(['--verify', '--enable-special-filenames', '-', '-&%s'%fd], create_fhs=['stdin', 'status', 'stderr'])
f.close()
sign = self._addHeaderFooter(sign, 'SIGNATURE')
proc.handles['stdin'].write(sign)
proc.handles['stdin'].close()
proc.handles['stderr'].close()
stat = proc.handles['status']
resp = self._read_response(stat)
proc.handles['status'].close()
try: proc.wait()
except IOError: pass
keyid = ''
if resp.has_key('GOODSIG'):
keyid = resp['GOODSIG'].split()[0]
return keyid
def get_keys(self, secret = False):
if not USE_GPG:
return {}
if secret:
opt = '--list-secret-keys'
else:
opt = '--list-keys'
proc = self.run(['--with-colons', opt],
create_fhs=['stdout'])
output = proc.handles['stdout'].read()
proc.handles['stdout'].close()
keys = {}
lines = output.split('\n')
for line in lines:
sline = line.split(':')
if (sline[0] == 'sec' and secret) or \
(sline[0] == 'pub' and not secret):
# make it unicode instance
keys[sline[4][8:]] = helpers.decode_string(sline[9])
return keys
try: proc.wait()
except IOError: pass
def get_secret_keys(self):
return self.get_keys(True)
def _stripHeaderFooter(self, data):
"""Remove header and footer from data"""
if not data: return ''
lines = data.split('\n')
while lines[0] != '':
lines.remove(lines[0])
while lines[0] == '':
lines.remove(lines[0])
i = 0
for line in lines:
if line:
if line[0] == '-': break
i = i+1
line = '\n'.join(lines[0:i])
return line
def _addHeaderFooter(self, data, type):
"""Add header and footer from data"""
out = "-----BEGIN PGP %s-----\n" % type
out = out + "Version: PGP\n"
out = out + "\n"
out = out + data + "\n"
out = out + "-----END PGP %s-----\n" % type
return out
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