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0bec96d6 | 1 | #! /usr/bin/env python3 |
ff4136c7 | 2 | # -*- coding: utf-8 -*- |
0bec96d6 AE |
3 | """********************************************************************* |
4 | * Edward is free software: you can redistribute it and/or modify * | |
5 | * it under the terms of the GNU Affero Public License as published by * | |
6 | * the Free Software Foundation, either version 3 of the License, or * | |
7 | * (at your option) any later version. * | |
8 | * * | |
9 | * Edward is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU Affero Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Affero Public License * | |
15 | * along with Edward. If not, see <http://www.gnu.org/licenses/>. * | |
16 | * * | |
17 | * Copyright (C) 2014-2015 Andrew Engelbrecht (AGPLv3+) * | |
18 | * Copyright (C) 2014 Josh Drake (AGPLv3+) * | |
19 | * Copyright (C) 2014 Lisa Marie Maginnis (AGPLv3+) * | |
8bdfb6d4 AE |
20 | * Copyright (C) 2009-2015 Tails developers <tails@boum.org> ( GPLv3+) * |
21 | * Copyright (C) 2009 W. Trevor King <wking@drexel.edu> ( GPLv2+) * | |
0bec96d6 AE |
22 | * * |
23 | * Special thanks to Josh Drake for writing the original edward bot! :) * | |
24 | * * | |
25 | ************************************************************************ | |
26 | ||
a5385c04 | 27 | Code sourced from these projects: |
0bec96d6 | 28 | |
8bdfb6d4 AE |
29 | * http://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz |
30 | * https://git-tails.immerda.ch/whisperback/tree/whisperBack/encryption.py?h=feature/python3 | |
31 | * http://www.physics.drexel.edu/~wking/code/python/send_pgp_mime | |
0bec96d6 AE |
32 | """ |
33 | ||
34 | import sys | |
0bec96d6 AE |
35 | import gpgme |
36 | import re | |
37 | import io | |
40c37ab3 | 38 | import os |
adcef2f7 | 39 | import importlib |
0bec96d6 | 40 | |
8bdfb6d4 AE |
41 | import email.parser |
42 | import email.message | |
43 | import email.encoders | |
44 | ||
45 | from email.mime.multipart import MIMEMultipart | |
46 | from email.mime.application import MIMEApplication | |
47 | from email.mime.nonmultipart import MIMENonMultipart | |
48 | ||
40c37ab3 | 49 | import edward_config |
c96f3837 | 50 | |
adcef2f7 AE |
51 | langs = ["an", "de", "el", "en", "fr", "ja", "pt-br", "ro", "ru", "tr"] |
52 | ||
38738401 AE |
53 | match_types = [('clearsign', |
54 | '-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----'), | |
55 | ('message', | |
56578eaf AE |
56 | '-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----'), |
57 | ('pubkey', | |
58 | '-----BEGIN PGP PUBLIC KEY BLOCK-----.*?-----END PGP PUBLIC KEY BLOCK-----'), | |
59 | ('detachedsig', | |
38738401 | 60 | '-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----')] |
56578eaf AE |
61 | |
62 | ||
63 | class EddyMsg (object): | |
64 | def __init__(self): | |
65 | self.multipart = False | |
66 | self.subparts = [] | |
67 | ||
68 | self.charset = None | |
69 | self.payload_bytes = None | |
70 | self.payload_pieces = [] | |
71 | ||
72 | self.filename = None | |
73 | self.content_type = None | |
74 | self.description_list = None | |
75 | ||
76 | ||
77 | class PayloadPiece (object): | |
78 | def __init__(self): | |
79 | self.piece_type = None | |
80 | self.string = None | |
81 | self.gpg_data = None | |
82 | ||
83 | ||
38738401 AE |
84 | class GPGData (object): |
85 | def __init__(self): | |
86 | self.decrypted = False | |
87 | ||
88 | self.plainobj = None | |
89 | self.sigs = [] | |
90 | self.keys = [] | |
91 | ||
d873ff48 AE |
92 | class ReplyInfo (object): |
93 | def __init__(self): | |
94 | self.replies = None | |
6906d46d AE |
95 | |
96 | self.target_key = None | |
97 | self.fallback_target_key = None | |
d873ff48 AE |
98 | self.msg_to_quote = "" |
99 | ||
100 | self.success_decrypt = False | |
101 | self.failed_decrypt = False | |
102 | self.public_key_received = False | |
103 | self.no_public_key = False | |
104 | self.sig_success = False | |
105 | self.sig_failure = False | |
106 | ||
38738401 | 107 | |
0bec96d6 AE |
108 | def main (): |
109 | ||
20f6e7c5 | 110 | handle_args() |
0bec96d6 | 111 | |
0a064403 AE |
112 | gpgme_ctx = get_gpg_context(edward_config.gnupghome, |
113 | edward_config.sign_with_key) | |
114 | ||
c96f3837 | 115 | email_text = sys.stdin.read() |
adcef2f7 AE |
116 | email_struct = parse_pgp_mime(email_text, gpgme_ctx) |
117 | ||
118 | email_to, email_from, email_subject = email_to_from_subject(email_text) | |
119 | lang = import_lang(email_to) | |
fafa21c3 | 120 | |
d873ff48 AE |
121 | replyinfo_obj = ReplyInfo() |
122 | replyinfo_obj.replies = lang.replies | |
123 | ||
124 | prepare_for_reply(email_struct, replyinfo_obj) | |
013f7cb8 | 125 | encrypt_to_key = get_key_from_fp(replyinfo_obj, gpgme_ctx) |
d873ff48 | 126 | reply_plaintext = write_reply(replyinfo_obj) |
adcef2f7 | 127 | |
adcef2f7 | 128 | print(reply_plaintext) |
6906d46d AE |
129 | debug(replyinfo_obj.target_key) |
130 | debug(replyinfo_obj.fallback_target_key) | |
1fccb295 | 131 | |
bf79a93e AE |
132 | # reply_mime = generate_encrypted_mime(plaintext, email_from, \ |
133 | # email_subject, encrypt_to_key, | |
134 | # gpgme_ctx) | |
c96f3837 | 135 | |
0bec96d6 | 136 | |
0a064403 AE |
137 | def get_gpg_context (gnupghome, sign_with_key_fp): |
138 | ||
139 | os.environ['GNUPGHOME'] = gnupghome | |
140 | ||
141 | gpgme_ctx = gpgme.Context() | |
142 | gpgme_ctx.armor = True | |
143 | ||
144 | try: | |
145 | sign_with_key = gpgme_ctx.get_key(sign_with_key_fp) | |
146 | except: | |
147 | error("unable to load signing key. is the gnupghome " | |
148 | + "and signing key properly set in the edward_config.py?") | |
149 | exit(1) | |
150 | ||
151 | gpgme_ctx.signers = [sign_with_key] | |
152 | ||
153 | return gpgme_ctx | |
154 | ||
155 | ||
38738401 | 156 | def parse_pgp_mime (email_text, gpgme_ctx): |
394a1476 AE |
157 | |
158 | email_struct = email.parser.Parser().parsestr(email_text) | |
159 | ||
928e3819 AE |
160 | eddymsg_obj = parse_mime(email_struct) |
161 | split_payloads(eddymsg_obj) | |
162 | gpg_on_payloads(eddymsg_obj, gpgme_ctx) | |
8bb4b0d5 | 163 | |
928e3819 | 164 | return eddymsg_obj |
0bec96d6 | 165 | |
0bec96d6 | 166 | |
56578eaf | 167 | def parse_mime(msg_struct): |
0bec96d6 | 168 | |
928e3819 | 169 | eddymsg_obj = EddyMsg() |
8bb4b0d5 | 170 | |
56578eaf AE |
171 | if msg_struct.is_multipart() == True: |
172 | payloads = msg_struct.get_payload() | |
0bec96d6 | 173 | |
928e3819 AE |
174 | eddymsg_obj.multipart = True |
175 | eddymsg_obj.subparts = list(map(parse_mime, payloads)) | |
dd11a483 | 176 | |
56578eaf | 177 | else: |
928e3819 | 178 | eddymsg_obj = get_subpart_data(msg_struct) |
394a1476 | 179 | |
928e3819 | 180 | return eddymsg_obj |
c267c233 | 181 | |
80119cab | 182 | |
56578eaf | 183 | def scan_and_split (payload_piece, match_type, pattern): |
cf75de65 | 184 | |
a5d37d44 AE |
185 | # don't try to re-split pieces containing gpg data |
186 | if payload_piece.piece_type != "text": | |
187 | return [payload_piece] | |
188 | ||
56578eaf AE |
189 | flags = re.DOTALL | re.MULTILINE |
190 | matches = re.search("(?P<beginning>.*?)(?P<match>" + pattern + | |
191 | ")(?P<rest>.*)", payload_piece.string, flags=flags) | |
86663388 | 192 | |
56578eaf AE |
193 | if matches == None: |
194 | pieces = [payload_piece] | |
c96f3837 | 195 | |
56578eaf | 196 | else: |
d437f8b2 | 197 | |
56578eaf AE |
198 | beginning = PayloadPiece() |
199 | beginning.string = matches.group('beginning') | |
200 | beginning.piece_type = payload_piece.piece_type | |
d437f8b2 | 201 | |
56578eaf AE |
202 | match = PayloadPiece() |
203 | match.string = matches.group('match') | |
204 | match.piece_type = match_type | |
d437f8b2 | 205 | |
56578eaf AE |
206 | rest = PayloadPiece() |
207 | rest.string = matches.group('rest') | |
208 | rest.piece_type = payload_piece.piece_type | |
d437f8b2 | 209 | |
56578eaf | 210 | more_pieces = scan_and_split(rest, match_type, pattern) |
4615b156 | 211 | pieces = [beginning, match ] + more_pieces |
d437f8b2 | 212 | |
56578eaf | 213 | return pieces |
d437f8b2 | 214 | |
d437f8b2 | 215 | |
56578eaf | 216 | def get_subpart_data (part): |
0bec96d6 | 217 | |
56578eaf | 218 | obj = EddyMsg() |
0bec96d6 | 219 | |
56578eaf AE |
220 | obj.charset = part.get_content_charset() |
221 | obj.payload_bytes = part.get_payload(decode=True) | |
222 | ||
223 | obj.filename = part.get_filename() | |
224 | obj.content_type = part.get_content_type() | |
225 | obj.description_list = part['content-description'] | |
226 | ||
227 | # your guess is as good as a-myy-ee-ine... | |
228 | if obj.charset == None: | |
229 | obj.charset = 'utf-8' | |
230 | ||
231 | if obj.payload_bytes != None: | |
0eb75d9c AE |
232 | try: |
233 | payload = PayloadPiece() | |
234 | payload.string = obj.payload_bytes.decode(obj.charset) | |
235 | payload.piece_type = 'text' | |
236 | ||
237 | obj.payload_pieces = [payload] | |
238 | except UnicodeDecodeError: | |
239 | pass | |
56578eaf AE |
240 | |
241 | return obj | |
242 | ||
243 | ||
928e3819 | 244 | def do_to_eddys_pieces (function_to_do, eddymsg_obj, data): |
56578eaf | 245 | |
928e3819 AE |
246 | if eddymsg_obj.multipart == True: |
247 | for sub in eddymsg_obj.subparts: | |
d873ff48 | 248 | do_to_eddys_pieces(function_to_do, sub, data) |
394a1476 | 249 | else: |
928e3819 | 250 | function_to_do(eddymsg_obj, data) |
dd11a483 AE |
251 | |
252 | ||
928e3819 | 253 | def split_payloads (eddymsg_obj): |
a5d37d44 AE |
254 | |
255 | for match_type in match_types: | |
928e3819 | 256 | do_to_eddys_pieces(split_payload_pieces, eddymsg_obj, match_type) |
a5d37d44 | 257 | |
a5d37d44 | 258 | |
928e3819 | 259 | def split_payload_pieces (eddymsg_obj, match_type): |
a5d37d44 AE |
260 | |
261 | (match_name, pattern) = match_type | |
262 | ||
263 | new_pieces_list = [] | |
928e3819 | 264 | for piece in eddymsg_obj.payload_pieces: |
a5d37d44 AE |
265 | new_pieces_list += scan_and_split(piece, match_name, pattern) |
266 | ||
928e3819 | 267 | eddymsg_obj.payload_pieces = new_pieces_list |
a5d37d44 AE |
268 | |
269 | ||
928e3819 | 270 | def gpg_on_payloads (eddymsg_obj, gpgme_ctx, prev_parts=[]): |
38738401 | 271 | |
928e3819 | 272 | if eddymsg_obj.multipart == True: |
101d54a8 | 273 | prev_parts=[] |
928e3819 | 274 | for sub in eddymsg_obj.subparts: |
101d54a8 AE |
275 | gpg_on_payloads (sub, gpgme_ctx, prev_parts) |
276 | prev_parts += [sub] | |
38738401 | 277 | |
d873ff48 | 278 | return |
38738401 | 279 | |
928e3819 | 280 | for piece in eddymsg_obj.payload_pieces: |
38738401 AE |
281 | |
282 | if piece.piece_type == "text": | |
283 | # don't transform the plaintext. | |
284 | pass | |
285 | ||
286 | elif piece.piece_type == "message": | |
7e18f14d | 287 | (plaintext, sigs) = decrypt_block(piece.string, gpgme_ctx) |
38738401 AE |
288 | |
289 | if plaintext: | |
290 | piece.gpg_data = GPGData() | |
b23e171d | 291 | piece.gpg_data.decrypted = True |
38738401 AE |
292 | piece.gpg_data.sigs = sigs |
293 | # recurse! | |
294 | piece.gpg_data.plainobj = parse_pgp_mime(plaintext, gpgme_ctx) | |
129543c3 | 295 | |
8f61c66a | 296 | elif piece.piece_type == "pubkey": |
f8ee6bd3 | 297 | key_fps = add_gpg_key(piece.string, gpgme_ctx) |
8f61c66a | 298 | |
f8ee6bd3 | 299 | if key_fps != []: |
8f61c66a | 300 | piece.gpg_data = GPGData() |
f8ee6bd3 | 301 | piece.gpg_data.keys = key_fps |
129543c3 AE |
302 | |
303 | elif piece.piece_type == "clearsign": | |
f8ee6bd3 | 304 | (plaintext, sig_fps) = verify_clear_signature(piece.string, gpgme_ctx) |
129543c3 | 305 | |
f8ee6bd3 | 306 | if sig_fps != []: |
129543c3 | 307 | piece.gpg_data = GPGData() |
f8ee6bd3 | 308 | piece.gpg_data.sigs = sig_fps |
129543c3 AE |
309 | piece.gpg_data.plainobj = parse_pgp_mime(plaintext, gpgme_ctx) |
310 | ||
101d54a8 AE |
311 | elif piece.piece_type == "detachedsig": |
312 | for prev in prev_parts: | |
313 | payload_bytes = prev.payload_bytes | |
6d240f68 | 314 | sig_fps = verify_detached_signature(piece.string, payload_bytes, gpgme_ctx) |
101d54a8 | 315 | |
6d240f68 AE |
316 | if sig_fps != []: |
317 | piece.gpg_data = GPGData() | |
318 | piece.gpg_data.sigs = sig_fps | |
319 | piece.gpg_data.plainobj = prev | |
320 | break | |
7e18f14d | 321 | |
38738401 AE |
322 | else: |
323 | pass | |
324 | ||
325 | ||
928e3819 | 326 | def prepare_for_reply (eddymsg_obj, replyinfo_obj): |
dd11a483 | 327 | |
928e3819 | 328 | do_to_eddys_pieces(prepare_for_reply_pieces, eddymsg_obj, replyinfo_obj) |
56578eaf | 329 | |
013f7cb8 AE |
330 | if replyinfo_obj.target_key == None: |
331 | replyinfo_obj.target_key = replyinfo_obj.fallback_target_key | |
332 | ||
333 | if replyinfo_obj.target_key == None: | |
334 | replyinfo_obj.no_public_key = True | |
335 | ||
56578eaf | 336 | |
928e3819 | 337 | def prepare_for_reply_pieces (eddymsg_obj, replyinfo_obj): |
56578eaf | 338 | |
928e3819 | 339 | for piece in eddymsg_obj.payload_pieces: |
38738401 | 340 | if piece.piece_type == "text": |
d873ff48 AE |
341 | # don't quote the plaintext part. |
342 | pass | |
343 | ||
38738401 | 344 | elif piece.piece_type == "message": |
d873ff48 AE |
345 | if piece.gpg_data == None: |
346 | replyinfo_obj.failed_decrypt = True | |
347 | else: | |
348 | replyinfo_obj.success_decrypt = True | |
d873ff48 | 349 | |
6906d46d AE |
350 | if replyinfo_obj.target_key != None: |
351 | continue | |
352 | if piece.gpg_data.sigs != []: | |
353 | replyinfo_obj.target_key = piece.gpg_data.sigs[0] | |
354 | replyinfo_obj.msg_to_quote = flatten_payloads(piece.gpg_data.plainobj) | |
355 | ||
356 | # to catch public keys in encrypted blocks | |
d873ff48 AE |
357 | prepare_for_reply(piece.gpg_data.plainobj, replyinfo_obj) |
358 | ||
8f61c66a | 359 | elif piece.piece_type == "pubkey": |
d873ff48 AE |
360 | if piece.gpg_data == None: |
361 | replyinfo_obj.no_public_key = True | |
362 | else: | |
363 | replyinfo_obj.public_key_received = True | |
364 | ||
365 | elif (piece.piece_type == "clearsign") \ | |
366 | or (piece.piece_type == "detachedsig"): | |
367 | if piece.gpg_data == None: | |
368 | replyinfo_obj.sig_failure = True | |
369 | else: | |
370 | replyinfo_obj.sig_success = True | |
371 | ||
6906d46d AE |
372 | if replyinfo_obj.target_key == None: |
373 | replyinfo_obj.fallback_target_key = piece.gpg_data.sigs[0] | |
374 | ||
375 | ||
d873ff48 | 376 | |
928e3819 | 377 | def flatten_payloads (eddymsg_obj): |
d873ff48 AE |
378 | |
379 | flat_string = "" | |
380 | ||
0aa88c27 AE |
381 | if eddymsg_obj == None: |
382 | return "" | |
383 | ||
928e3819 AE |
384 | if eddymsg_obj.multipart == True: |
385 | for sub in eddymsg_obj.subparts: | |
d873ff48 AE |
386 | flat_string += flatten_payloads (sub) |
387 | ||
388 | return flat_string | |
389 | ||
6906d46d | 390 | # todo: don't include nested decrypted messages. |
928e3819 | 391 | for piece in eddymsg_obj.payload_pieces: |
d873ff48 AE |
392 | if piece.piece_type == "text": |
393 | flat_string += piece.string | |
0aa88c27 AE |
394 | elif piece.piece_type == "message": |
395 | flat_string += flatten_payloads(piece.plainobj) | |
396 | elif ((piece.piece_type == "clearsign") \ | |
397 | or (piece.piece_type == "detachedsig")) \ | |
398 | and (piece.gpg_data != None): | |
399 | flat_string += flatten_payloads (piece.gpg_data.plainobj) | |
400 | ||
d873ff48 AE |
401 | |
402 | return flat_string | |
403 | ||
404 | ||
013f7cb8 AE |
405 | def get_key_from_fp (replyinfo_obj, gpgme_ctx): |
406 | ||
407 | if replyinfo_obj.target_key != None: | |
408 | try: | |
409 | encrypt_to_key = gpgme_ctx.get_key(replyinfo_obj.target_key) | |
410 | return encrypt_to_key | |
411 | ||
412 | except: | |
413 | pass | |
414 | ||
415 | # no available key to use | |
416 | replyinfo_obj.target_key = None | |
417 | replyinfo_obj.fallback_target_key = None | |
418 | ||
419 | replyinfo_obj.no_public_key = True | |
420 | replyinfo_obj.public_key_received = False | |
421 | ||
422 | return None | |
423 | ||
424 | ||
d873ff48 AE |
425 | def write_reply (replyinfo_obj): |
426 | ||
427 | reply_plain = "" | |
428 | ||
429 | if replyinfo_obj.success_decrypt == True: | |
430 | quoted_text = email_quote_text(replyinfo_obj.msg_to_quote) | |
431 | reply_plain += replyinfo_obj.replies['success_decrypt'] | |
432 | reply_plain += quoted_text | |
433 | ||
434 | elif replyinfo_obj.failed_decrypt == True: | |
435 | reply_plain += replyinfo_obj.replies['failed_decrypt'] | |
436 | ||
437 | ||
438 | if replyinfo_obj.sig_success == True: | |
439 | reply_plain += "\n\n" | |
440 | reply_plain += replyinfo_obj.replies['sig_success'] | |
441 | ||
442 | elif replyinfo_obj.sig_failure == True: | |
443 | reply_plain += "\n\n" | |
444 | reply_plain += replyinfo_obj.replies['sig_failure'] | |
445 | ||
446 | ||
447 | if replyinfo_obj.public_key_received == True: | |
448 | reply_plain += "\n\n" | |
449 | reply_plain += replyinfo_obj.replies['public_key_received'] | |
450 | ||
451 | elif replyinfo_obj.no_public_key == True: | |
452 | reply_plain += "\n\n" | |
453 | reply_plain += replyinfo_obj.replies['no_public_key'] | |
454 | ||
455 | ||
456 | reply_plain += "\n\n" | |
457 | reply_plain += replyinfo_obj.replies['signature'] | |
56578eaf | 458 | |
d873ff48 | 459 | return reply_plain |
56578eaf AE |
460 | |
461 | ||
8f61c66a | 462 | def add_gpg_key (key_block, gpgme_ctx): |
c267c233 | 463 | |
8f61c66a | 464 | fp = io.BytesIO(key_block.encode('ascii')) |
c267c233 | 465 | |
8f61c66a AE |
466 | result = gpgme_ctx.import_(fp) |
467 | imports = result.imports | |
c267c233 | 468 | |
f8ee6bd3 | 469 | key_fingerprints = [] |
c267c233 | 470 | |
8f61c66a AE |
471 | if imports != []: |
472 | for import_ in imports: | |
473 | fingerprint = import_[0] | |
f8ee6bd3 | 474 | key_fingerprints += [fingerprint] |
c267c233 | 475 | |
e49673aa | 476 | debug("added gpg key: " + fingerprint) |
ec1e779a | 477 | |
f8ee6bd3 | 478 | return key_fingerprints |
ec1e779a AE |
479 | |
480 | ||
129543c3 | 481 | def verify_clear_signature (sig_block, gpgme_ctx): |
cf75de65 | 482 | |
129543c3 AE |
483 | # FIXME: this might require the un-decoded bytes |
484 | # or the correct re-encoding with the carset of the mime part. | |
485 | msg_fp = io.BytesIO(sig_block.encode('utf-8')) | |
486 | ptxt_fp = io.BytesIO() | |
cf75de65 | 487 | |
129543c3 | 488 | result = gpgme_ctx.verify(msg_fp, None, ptxt_fp) |
cf75de65 | 489 | |
129543c3 AE |
490 | # FIXME: this might require using the charset of the mime part. |
491 | plaintext = ptxt_fp.getvalue().decode('utf-8') | |
cf75de65 | 492 | |
f8ee6bd3 | 493 | sig_fingerprints = [] |
129543c3 | 494 | for res_ in result: |
f8ee6bd3 | 495 | sig_fingerprints += [res_.fpr] |
cf75de65 | 496 | |
f8ee6bd3 | 497 | return plaintext, sig_fingerprints |
cf75de65 AE |
498 | |
499 | ||
101d54a8 AE |
500 | def verify_detached_signature (detached_sig, plaintext_bytes, gpgme_ctx): |
501 | ||
502 | detached_sig_fp = io.BytesIO(detached_sig.encode('ascii')) | |
503 | plaintext_fp = io.BytesIO(plaintext_bytes) | |
504 | ptxt_fp = io.BytesIO() | |
505 | ||
506 | result = gpgme_ctx.verify(detached_sig_fp, plaintext_fp, None) | |
507 | ||
508 | sig_fingerprints = [] | |
509 | for res_ in result: | |
510 | sig_fingerprints += [res_.fpr] | |
511 | ||
512 | return sig_fingerprints | |
513 | ||
514 | ||
5b3053c1 | 515 | def decrypt_block (msg_block, gpgme_ctx): |
0bec96d6 | 516 | |
5b3053c1 | 517 | block_b = io.BytesIO(msg_block.encode('ascii')) |
0bec96d6 AE |
518 | plain_b = io.BytesIO() |
519 | ||
afc1f64c AE |
520 | try: |
521 | sigs = gpgme_ctx.decrypt_verify(block_b, plain_b) | |
522 | except: | |
523 | return ("",[]) | |
0bec96d6 | 524 | |
6aa41372 | 525 | plaintext = plain_b.getvalue().decode('utf-8') |
cbdf22c1 AE |
526 | |
527 | fingerprints = [] | |
528 | for sig in sigs: | |
529 | fingerprints += [sig.fpr] | |
530 | return (plaintext, fingerprints) | |
0bec96d6 AE |
531 | |
532 | ||
d0489345 | 533 | def choose_reply_encryption_key (gpgme_ctx, fingerprints): |
fafa21c3 AE |
534 | |
535 | reply_key = None | |
d0489345 AE |
536 | for fp in fingerprints: |
537 | try: | |
538 | key = gpgme_ctx.get_key(fp) | |
539 | ||
540 | if (key.can_encrypt == True): | |
541 | reply_key = key | |
542 | break | |
543 | except: | |
544 | continue | |
545 | ||
fafa21c3 | 546 | |
216708e9 | 547 | return reply_key |
fafa21c3 AE |
548 | |
549 | ||
d65993b8 AE |
550 | def email_to_from_subject (email_text): |
551 | ||
552 | email_struct = email.parser.Parser().parsestr(email_text) | |
553 | ||
554 | email_to = email_struct['To'] | |
555 | email_from = email_struct['From'] | |
556 | email_subject = email_struct['Subject'] | |
557 | ||
558 | return email_to, email_from, email_subject | |
559 | ||
560 | ||
adcef2f7 AE |
561 | def import_lang(email_to): |
562 | ||
5250b3b8 AE |
563 | if email_to != None: |
564 | for lang in langs: | |
565 | if "edward-" + lang in email_to: | |
566 | lang = "lang." + re.sub('-', '_', lang) | |
567 | language = importlib.import_module(lang) | |
adcef2f7 | 568 | |
5250b3b8 | 569 | return language |
adcef2f7 AE |
570 | |
571 | return importlib.import_module("lang.en") | |
572 | ||
573 | ||
bf79a93e | 574 | def generate_encrypted_mime (plaintext, email_from, email_subject, encrypt_to_key, |
0a064403 | 575 | gpgme_ctx): |
1da9b527 | 576 | |
8bdfb6d4 | 577 | |
1da9b527 AE |
578 | reply = "To: " + email_from + "\n" |
579 | reply += "Subject: " + email_subject + "\n" | |
216708e9 AE |
580 | |
581 | if (encrypt_to_key != None): | |
582 | plaintext_reply = "thanks for the message!\n\n\n" | |
583 | plaintext_reply += email_quote_text(plaintext) | |
584 | ||
8bdfb6d4 AE |
585 | # quoted printable encoding lets most ascii characters look normal |
586 | # before the decrypted mime message is decoded. | |
587 | char_set = email.charset.Charset("utf-8") | |
588 | char_set.body_encoding = email.charset.QP | |
589 | ||
590 | # MIMEText doesn't allow setting the text encoding | |
591 | # so we use MIMENonMultipart. | |
592 | plaintext_mime = MIMENonMultipart('text', 'plain') | |
593 | plaintext_mime.set_payload(plaintext_reply, charset=char_set) | |
594 | ||
595 | encrypted_text = encrypt_sign_message(plaintext_mime.as_string(), | |
596 | encrypt_to_key, | |
40c37ab3 | 597 | gpgme_ctx) |
8bdfb6d4 AE |
598 | |
599 | control_mime = MIMEApplication("Version: 1", | |
600 | _subtype='pgp-encrypted', | |
601 | _encoder=email.encoders.encode_7or8bit) | |
602 | control_mime['Content-Description'] = 'PGP/MIME version identification' | |
603 | control_mime.set_charset('us-ascii') | |
604 | ||
605 | encoded_mime = MIMEApplication(encrypted_text, | |
606 | _subtype='octet-stream; name="encrypted.asc"', | |
607 | _encoder=email.encoders.encode_7or8bit) | |
608 | encoded_mime['Content-Description'] = 'OpenPGP encrypted message' | |
609 | encoded_mime['Content-Disposition'] = 'inline; filename="encrypted.asc"' | |
610 | encoded_mime.set_charset('us-ascii') | |
611 | ||
612 | message_mime = MIMEMultipart(_subtype="encrypted", protocol="application/pgp-encrypted") | |
613 | message_mime.attach(control_mime) | |
614 | message_mime.attach(encoded_mime) | |
615 | message_mime['Content-Disposition'] = 'inline' | |
216708e9 | 616 | |
8bdfb6d4 | 617 | reply += message_mime.as_string() |
216708e9 AE |
618 | |
619 | else: | |
8bdfb6d4 | 620 | reply += "\n" |
216708e9 AE |
621 | reply += "Sorry, i couldn't find your key.\n" |
622 | reply += "I'll need that to encrypt a message to you." | |
1da9b527 AE |
623 | |
624 | return reply | |
625 | ||
626 | ||
f87041f8 AE |
627 | def email_quote_text (text): |
628 | ||
629 | quoted_message = re.sub(r'^', r'> ', text, flags=re.MULTILINE) | |
630 | ||
631 | return quoted_message | |
632 | ||
633 | ||
0a064403 | 634 | def encrypt_sign_message (plaintext, encrypt_to_key, gpgme_ctx): |
897cbaf6 | 635 | |
6aa41372 | 636 | plaintext_bytes = io.BytesIO(plaintext.encode('ascii')) |
1da9b527 AE |
637 | encrypted_bytes = io.BytesIO() |
638 | ||
897cbaf6 | 639 | gpgme_ctx.encrypt_sign([encrypt_to_key], gpgme.ENCRYPT_ALWAYS_TRUST, |
1da9b527 AE |
640 | plaintext_bytes, encrypted_bytes) |
641 | ||
6aa41372 | 642 | encrypted_txt = encrypted_bytes.getvalue().decode('ascii') |
1da9b527 AE |
643 | return encrypted_txt |
644 | ||
645 | ||
0a064403 AE |
646 | def error (error_msg): |
647 | ||
e4fb2ab2 | 648 | sys.stderr.write(progname + ": " + str(error_msg) + "\n") |
0a064403 AE |
649 | |
650 | ||
5e8f9094 AE |
651 | def debug (debug_msg): |
652 | ||
653 | if edward_config.debug == True: | |
0a064403 | 654 | error(debug_msg) |
5e8f9094 AE |
655 | |
656 | ||
20f6e7c5 AE |
657 | def handle_args (): |
658 | if __name__ == "__main__": | |
659 | ||
660 | global progname | |
661 | progname = sys.argv[0] | |
662 | ||
663 | if len(sys.argv) > 1: | |
664 | print(progname + ": error, this program doesn't " \ | |
665 | "need any arguments.", file=sys.stderr) | |
666 | exit(1) | |
667 | ||
668 | ||
0bec96d6 AE |
669 | main() |
670 |