1 /* notmuch - Not much of an email program, (just index and search)
3 * Copyright © 2019 Daniel Kahn Gillmor
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see https://www.gnu.org/licenses/ .
18 * Authors: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
26 _notmuch_crypto_payload_has_legacy_display (GMimeObject *payload)
28 GMimeMultipart *mpayload;
29 const char *protected_header_parameter;
32 if (! g_mime_content_type_is_type (g_mime_object_get_content_type (payload),
33 "multipart", "mixed"))
35 protected_header_parameter = g_mime_object_get_content_type_parameter (payload, "protected-headers");
36 if ((! protected_header_parameter) || strcmp (protected_header_parameter, "v1"))
38 if (! GMIME_IS_MULTIPART (payload))
40 mpayload = GMIME_MULTIPART (payload);
43 if (g_mime_multipart_get_count (mpayload) != 2)
45 first = g_mime_multipart_get_part (mpayload, 0);
46 /* Early implementations that generated "Legacy Display" parts used
47 Content-Type: text/rfc822-headers, but text/plain is more widely
48 rendered, so it is now the standard choice. We accept either as a
49 Legacy Display part. */
50 if (! (g_mime_content_type_is_type (g_mime_object_get_content_type (first),
52 g_mime_content_type_is_type (g_mime_object_get_content_type (first),
53 "text", "rfc822-headers")))
55 protected_header_parameter = g_mime_object_get_content_type_parameter (first, "protected-headers");
56 if ((! protected_header_parameter) || strcmp (protected_header_parameter, "v1"))
58 if (! GMIME_IS_TEXT_PART (first))
65 _notmuch_repair_crypto_payload_skip_legacy_display (GMimeObject *payload)
67 if (_notmuch_crypto_payload_has_legacy_display (payload)) {
68 return g_mime_multipart_get_part (GMIME_MULTIPART (payload), 1);
75 * https://tools.ietf.org/html/draft-dkg-openpgp-pgpmime-message-mangling-00#section-4.1.1 */
77 _notmuch_is_mixed_up_mangled (GMimeObject *part)
79 GMimeMultipart *mpart = NULL;
80 GMimeObject *parts[3] = {NULL, NULL, NULL};
81 GMimeContentType *type = NULL;
82 char *prelude_string = NULL;
83 bool prelude_is_empty;
87 type = g_mime_object_get_content_type (part);
90 if (! g_mime_content_type_is_type (type, "multipart", "mixed"))
92 if (! GMIME_IS_MULTIPART (part)) /* probably impossible */
94 mpart = GMIME_MULTIPART (part);
97 if (g_mime_multipart_get_count (mpart) != 3)
99 parts[0] = g_mime_multipart_get_part (mpart, 0);
100 if (! g_mime_content_type_is_type (g_mime_object_get_content_type (parts[0]),
103 if (! GMIME_IS_TEXT_PART (parts[0]))
105 parts[1] = g_mime_multipart_get_part (mpart, 1);
106 if (! g_mime_content_type_is_type (g_mime_object_get_content_type (parts[1]),
107 "application", "pgp-encrypted"))
109 parts[2] = g_mime_multipart_get_part (mpart, 2);
110 if (! g_mime_content_type_is_type (g_mime_object_get_content_type (parts[2]),
111 "application", "octet-stream"))
114 /* Is parts[0] length 0? */
115 prelude_string = g_mime_text_part_get_text (GMIME_TEXT_PART (parts[0]));
116 prelude_is_empty = (prelude_string[0] == '\0');
117 g_free (prelude_string);
118 if (! prelude_is_empty)
121 /* FIXME: after decoding and stripping whitespace, is parts[1]
122 * subpart just "Version: 1" ? */
124 /* FIXME: can we determine that parts[2] subpart is *only* PGP
125 * encrypted data? I tried g_mime_part_get_openpgp_data () but
126 * found https://github.com/jstedfast/gmime/issues/60 */
133 * https://tools.ietf.org/html/draft-dkg-openpgp-pgpmime-message-mangling-00#section-4.1.2 */
135 _notmuch_repair_mixed_up_mangled (GMimeObject *part)
137 GMimeMultipart *mpart = NULL, *mpart_ret = NULL;
138 GMimeObject *ret = NULL;
140 if (! _notmuch_is_mixed_up_mangled (part))
142 mpart = GMIME_MULTIPART (part);
143 ret = GMIME_OBJECT (g_mime_multipart_encrypted_new ());
146 mpart_ret = GMIME_MULTIPART (ret);
147 if (mpart_ret == NULL) {
148 g_object_unref (ret);
151 g_mime_object_set_content_type_parameter (ret, "protocol", "application/pgp-encrypted");
153 g_mime_multipart_insert (mpart_ret, 0, g_mime_multipart_get_part (mpart, 1));
154 g_mime_multipart_insert (mpart_ret, 1, g_mime_multipart_get_part (mpart, 2));