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gpgit.py
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gpgit.py
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#!/usr/bin/env python3
# GPGIt : Automatically GPG-encrypt incoming email
# Aeris <aeris@imirhil.fr>
# Licensed under AGPLv3 or later
from __future__ import print_function
import email
import sys, os
import re
import gpg
from gpg.core import Data, Context
from email.mime.base import MIMEBase
from email.mime.application import MIMEApplication
import email.encoders
class GPG:
def __init__(self):
gpg.core.check_version(None)
self.__context = Context()
self.__context.set_armor(1)
def __get_keys(self, recipients):
return [self.__context.get_key(recipient, 0) for recipient in recipients]
def encrypt(self, plain, recipients):
cipher = Data()
self.__context.op_encrypt(self.__get_keys(recipients), 1, Data(plain), cipher)
cipher.seek(0,0)
return cipher.read()
def decrypt(self, ciphertext):
plaintext = Data()
self.__context.op_decrypt(Data(ciphertext), plaintext)
plaintext.seek(0,0)
return plaintext.read()
def set_header(message, name, value, **params):
if value is None:
del message[name]
else:
if name in message:
message.replace_header(name, value)
else:
message.add_header(name, value, **params)
class Message:
def __init__(self, message):
self._message = message
def __str__(self):
return self._message.as_string()
def _mime_encrypt(self, payload, gpg, keys):
payload = gpg.encrypt(payload, keys)
self._message.set_type("multipart/encrypted");
self._message.set_param("protocol", "application/pgp-encrypted");
self._message.del_param("micalg");
set_header(self._message, "Content-Transfer-Encoding", None)
set_header(self._message, "X-GPGIt", "true")
self._message.preamble = ""
self._message.set_payload(None)
pgp_encrypted = MIMEApplication("Version: 1", "pgp-encrypted", email.encoders.encode_7or8bit)
set_header(pgp_encrypted, "Content-Disposition", "attachment")
set_header(pgp_encrypted, "MIME-Version", None)
self._message.attach(pgp_encrypted)
octet_stream = MIMEApplication(payload, "octet-stream", email.encoders.encode_7or8bit)
set_header(octet_stream, "Content-Disposition", "inline", filename="msg.asc")
set_header(octet_stream, "MIME-Version", None)
self._message.attach(octet_stream)
class PlainTextMessage(Message):
def __init__(self, message):
Message.__init__(self, message)
self.__content = message.get_payload(decode=True)
def is_encrypted(self):
return re.search(b"-----BEGIN PGP MESSAGE-----", self.__content, flags = re.MULTILINE) is not None
def is_signed(self):
return re.search(b"-----BEGIN PGP SIGNED MESSAGE-----", self.__content, flags = re.MULTILINE) is not None
def encode(self):
encoding = self._message["Content-Transfer-Encoding"]
if encoding is "quoted-printable":
return email.encoders.encode_quopri(self._message)
elif encoding in ["7bit", "8bit"]:
return email.encoders.encode_7or8bit(self._message)
elif encoding is "base64":
return email.encoders.encode_base64(self._message)
def encrypt(self, gpg, keys):
if self.is_encrypted() or self.is_signed():
return
if self._message.get_content_type() == "text/plain":
self._message.set_payload(gpg.encrypt(self.__content, keys))
set_header(self._message, "Content-Transfer-Encoding", None)
set_header(self._message, "X-GPGIt", "true")
else:
payload = email.message.Message()
payload.set_type(self._message.get_content_type())
payload.set_charset(self._message.get_content_charset())
payload.set_payload(self._message.get_payload())
set_header(payload, "Content-Transfer-Encoding", self._message.get("Content-Transfer-Encoding"))
set_header(payload, "MIME-Version", None)
self._mime_encrypt(payload.as_string(), gpg, keys)
class MimeMessage(Message):
def __init__(self, message):
Message.__init__(self, message)
def is_encrypted(self):
return self._message.get_content_type() == "multipart/encrypted"
def is_signed(self):
return self._message.get_content_type() == "multipart/signed"
def encrypt(self, gpg, keys):
if self.is_encrypted():
return
payload = MIMEBase(self._message.get_content_maintype(), self._message.get_content_subtype())
payload.set_charset(self._message.get_charset())
payload.set_payload(self._message.get_payload())
payload.set_boundary(self._message.get_boundary())
self._mime_encrypt(payload.as_string(), gpg, keys)
class WrapperMessage(PlainTextMessage):
def __init__(self, message, plaintext):
self.plaintext = plaintext
PlainTextMessage.__init__(self, message)
def encrypt(self, gpg, keys):
payload = gpg.encrypt(self.plaintext, keys)
self._message.set_payload(payload)
set_header(self._message, "Content-Transfer-Encoding", None)
set_header(self._message, "X-GPGIt-Wrapped", "true")
def decrypt(self, gpg):
assert("X-GPGIt-Wrapped" in self._message)
ciphertext = self._message.get_payload() #.get_payload()
plaintext = gpg.decrypt(ciphertext)
return plaintext
def wrap_message(message_, message, recipients):
gpg = GPG()
m = WrapperMessage(message, message_)
m.encrypt(gpg, recipients)
return(m)
def encrypt_message(message_, message, recipients):
gpg = GPG()
if message.is_multipart():
m = MimeMessage(message)
else:
m = PlainTextMessage(message)
m.encrypt(gpg, recipients)
return(m)
if __name__ == "__main__":
gpg = GPG()
message_ = sys.stdin.read()
message = email.message_from_string(message_)
mode = sys.argv[1]
recipients = sys.argv[2:]
if (mode == "--encrypt"):
if message.is_multipart():
message = MimeMessage(message)
else:
message = PlainTextMessage(message)
message.encrypt(gpg, recipients)
print(message)
elif (mode == "--wrap"):
m = WrapperMessage(message, message_)
m.encrypt(gpg, recipients)
print(m)
elif (mode == "--decrypt"):
try:
m = WrapperMessage(message, message_)
res = m.decrypt(gpg)
print(res.decode("utf-8"),end="")
except:
print(message_,end="")
else:
assert(False)