Reformat GnuPG module
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2 changed files with 145 additions and 117 deletions
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@ -1,22 +1,24 @@
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#
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# gpg-mailgate
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# gpg-mailgate
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#
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# This file is part of the gpg-mailgate source code.
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# This file is part of the gpg-mailgate source code.
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#
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# gpg-mailgate is free software: you can redistribute it and/or modify
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# it 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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# gpg-mailgate is free software: you can redistribute it and/or modify
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# it 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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#
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# gpg-mailgate source code is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# gpg-mailgate source code is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gpg-mailgate source code. If not, see <http://www.gnu.org/licenses/>.
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# You should have received a copy of the GNU General Public License
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# along with gpg-mailgate source code. If not, see <http://www.gnu.org/licenses/>.
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#
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"""GnuPG wrapper module."""
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import os
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import os.path
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import subprocess
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@ -24,6 +26,7 @@ import shutil
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import random
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import string
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import sys
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import logging
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LINE_FINGERPRINT = 'fpr'
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@ -31,136 +34,161 @@ LINE_USER_ID = 'uid'
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POS_FINGERPRINT = 9
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def build_command(key_home, *args, **kwargs):
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cmd = ["gpg", '--homedir', key_home] + list(args)
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return cmd
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LOG = logging.getLogger(__name__)
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def public_keys( keyhome ):
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cmd = build_command(keyhome, '--list-keys', '--with-colons')
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p = subprocess.Popen( cmd, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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p.wait()
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keys = dict()
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fingerprint = None
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email = None
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for line in p.stdout.readlines():
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line = line.decode(sys.getdefaultencoding())
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if line[0:3] == LINE_FINGERPRINT:
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fingerprint = line.split(':')[POS_FINGERPRINT]
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if line[0:3] == LINE_USER_ID:
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if ('<' not in line or '>' not in line):
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continue
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email = line.split('<')[1].split('>')[0]
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if not (fingerprint is None or email is None):
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keys[fingerprint] = email
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fingerprint = None
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email = None
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return keys
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def _build_command(key_home, *args, **kwargs):
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cmd = ["gpg", '--homedir', key_home] + list(args)
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return cmd
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def public_keys(keyhome):
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"""List public keys from keyring KEYHOME."""
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cmd = _build_command(keyhome, '--list-keys', '--with-colons')
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p = subprocess.Popen(cmd, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.wait()
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keys = dict()
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fingerprint = None
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email = None
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for line in p.stdout.readlines():
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line = line.decode(sys.getdefaultencoding())
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if line[0:3] == LINE_FINGERPRINT:
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fingerprint = line.split(':')[POS_FINGERPRINT]
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if line[0:3] == LINE_USER_ID:
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if ('<' not in line or '>' not in line):
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continue
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email = line.split('<')[1].split('>')[0]
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if not (fingerprint is None or email is None):
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keys[fingerprint] = email
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fingerprint = None
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email = None
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return keys
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def _to_bytes(s) -> bytes:
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if isinstance(s, str):
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return bytes(s, sys.getdefaultencoding())
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else:
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return s
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def to_bytes(s) -> bytes:
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if isinstance(s, str):
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return bytes(s, sys.getdefaultencoding())
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else:
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return s
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# Confirms a key has a given email address by importing it into a temporary
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# keyring. If this operation succeeds and produces a message mentioning the
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# expected email, a key is confirmed.
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def confirm_key( content, email ):
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tmpkeyhome = ''
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content = to_bytes(content)
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expected_email = to_bytes(email.lower())
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def confirm_key(content, email):
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"""Verify that the key CONTENT is assigned to identity EMAIL."""
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tmpkeyhome = ''
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content = _to_bytes(content)
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expected_email = _to_bytes(email.lower())
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while True:
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tmpkeyhome = '/tmp/' + ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(12))
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if not os.path.exists(tmpkeyhome):
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break
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while True:
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tmpkeyhome = '/tmp/' + ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(12))
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if not os.path.exists(tmpkeyhome):
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break
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# let only the owner access the directory, otherwise gpg would complain
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os.mkdir(tmpkeyhome, mode=0o700)
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localized_env = os.environ.copy()
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localized_env["LANG"] = "C"
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p = subprocess.Popen( build_command(tmpkeyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=localized_env )
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result = p.communicate(input=content)[1]
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confirmed = False
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# let only the owner access the directory, otherwise gpg would complain
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os.mkdir(tmpkeyhome, mode=0o700)
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localized_env = os.environ.copy()
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localized_env["LANG"] = "C"
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p = subprocess.Popen(_build_command(tmpkeyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=localized_env)
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result = p.communicate(input=content)[1]
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confirmed = False
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for line in result.split(b"\n"):
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if b'imported' in line and b'<' in line and b'>' in line:
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if line.split(b'<')[1].split(b'>')[0].lower() == expected_email:
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confirmed = True
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break
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else:
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break # confirmation failed
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for line in result.split(b"\n"):
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if b'imported' in line and b'<' in line and b'>' in line:
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if line.split(b'<')[1].split(b'>')[0].lower() == expected_email:
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confirmed = True
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break
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else:
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break # confirmation failed
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# cleanup
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shutil.rmtree(tmpkeyhome)
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# cleanup
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shutil.rmtree(tmpkeyhome)
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return confirmed
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return confirmed
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# adds a key and ensures it has the given email address
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def add_key( keyhome, content ):
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if isinstance(content, str):
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content = bytes(content, sys.getdefaultencoding())
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p = subprocess.Popen( build_command(keyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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p.communicate(input=content)
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p.wait()
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def add_key(keyhome, content):
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"""Register new key CONTENT in the keyring KEYHOME."""
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if isinstance(content, str):
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content = bytes(content, sys.getdefaultencoding())
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p = subprocess.Popen(_build_command(keyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.communicate(input=content)
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p.wait()
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def delete_key( keyhome, email ):
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from email.utils import parseaddr
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result = parseaddr(email)
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if result[1]:
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# delete all keys matching this email address
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p = subprocess.Popen( build_command(keyhome, '--delete-key', '--batch', '--yes', result[1]), stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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p.wait()
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return True
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def delete_key(keyhome, email):
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"""Remove key assigned to identity EMAIL from keyring KEYHOME."""
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from email.utils import parseaddr
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result = parseaddr(email)
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if result[1]:
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# delete all keys matching this email address
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p = subprocess.Popen(_build_command(keyhome, '--delete-key', '--batch', '--yes', result[1]), stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.wait()
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return True
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return False
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return False
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class GPGEncryptor:
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def __init__(self, keyhome, recipients = None, charset = None):
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self._keyhome = keyhome
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self._message = b''
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self._recipients = list()
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self._charset = charset
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if recipients != None:
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self._recipients.extend(recipients)
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"""A wrapper for 'gpg -e' command."""
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def update(self, message):
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self._message += message
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def __init__(self, keyhome, recipients=None, charset=None):
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"""Initialise the wrapper."""
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self._keyhome = keyhome
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self._message = b''
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self._recipients = list()
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self._charset = charset
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if recipients is not None:
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self._recipients.extend(recipients)
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def encrypt(self):
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p = subprocess.Popen( self._command(), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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encdata = p.communicate(input=self._message)[0]
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return (encdata, p.returncode)
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def update(self, message):
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"""Append MESSAGE to buffer about to be encrypted."""
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self._message += message
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def _command(self):
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cmd = build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--pgp7", "--no-secmem-warning", "-a", "-e")
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def encrypt(self):
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"""Feed GnuPG with the message."""
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p = subprocess.Popen(self._command(), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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encdata = p.communicate(input=self._message)[0]
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return (encdata, p.returncode)
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# add recipients
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for recipient in self._recipients:
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cmd.append("-r")
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cmd.append(recipient)
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def _command(self):
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cmd = _build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--pgp7", "--no-secmem-warning", "-a", "-e")
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# add on the charset, if set
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if self._charset:
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cmd.append("--comment")
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cmd.append('Charset: ' + self._charset)
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# add recipients
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for recipient in self._recipients:
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cmd.append("-r")
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cmd.append(recipient)
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# add on the charset, if set
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if self._charset:
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cmd.append("--comment")
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cmd.append('Charset: ' + self._charset)
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LOG.debug(f'Built command: {cmd!r}')
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return cmd
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return cmd
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class GPGDecryptor:
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def __init__(self, keyhome):
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self._keyhome = keyhome
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self._message = ''
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"""A wrapper for 'gpg -d' command."""
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def update(self, message):
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self._message += message
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def __init__(self, keyhome):
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"""Initialise the wrapper."""
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self._keyhome = keyhome
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self._message = ''
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def decrypt(self):
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p = subprocess.Popen( self._command(), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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decdata = p.communicate(input=self._message)[0]
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return (decdata, p.returncode)
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def update(self, message):
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"""Append encrypted content to be decrypted."""
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self._message += message
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def _command(self):
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return build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--no-secmem-warning", "-a", "-d")
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def decrypt(self):
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"""Decrypt the message."""
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p = subprocess.Popen(self._command(), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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decdata = p.communicate(input=self._message)[0]
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return (decdata, p.returncode)
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def _command(self):
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return _build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--no-secmem-warning", "-a", "-d")
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@ -4,11 +4,11 @@ import unittest
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class GnuPGUtilitiesTest(unittest.TestCase):
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def test_build_default_command(self):
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cmd = GnuPG.build_command("test/keyhome")
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cmd = GnuPG._build_command("test/keyhome")
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self.assertEqual(cmd, ["gpg", "--homedir", "test/keyhome"])
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def test_build_command_extended_with_args(self):
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cmd = GnuPG.build_command("test/keyhome", "--foo", "--bar")
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cmd = GnuPG._build_command("test/keyhome", "--foo", "--bar")
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self.assertEqual(cmd, ["gpg", "--homedir", "test/keyhome", "--foo", "--bar"])
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