aboutsummaryrefslogtreecommitdiffstats
path: root/em-format/e-mail-parser-multipart-signed.c
blob: bd6e1e29708b487323f4ccc1e6addc8efb6658de (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/*
 * e-mail-parser-multipart-signed.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-format-extensions.h"

#include <em-format/e-mail-parser-extension.h>
#include <em-format/e-mail-parser.h>
#include <em-format/e-mail-part-utils.h>

#include <glib/gi18n-lib.h>
#include <camel/camel.h>

typedef struct _EMailParserMultipartSigned {
    GObject parent;
} EMailParserMultipartSigned;

typedef struct _EMailParserMultipartSignedClass {
    GObjectClass parent_class;
} EMailParserMultipartSignedClass;

static void e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface);
static void e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface);

G_DEFINE_TYPE_EXTENDED (
    EMailParserMultipartSigned,
    e_mail_parser_multipart_signed,
    G_TYPE_OBJECT,
    0,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_MAIL_EXTENSION,
        e_mail_parser_mail_extension_interface_init)
    G_IMPLEMENT_INTERFACE (
        E_TYPE_MAIL_PARSER_EXTENSION,
        e_mail_parser_parser_extension_interface_init));

static const gchar * parser_mime_types[] = { "multipart/signed",
                        "application/pgp-signature",
                        NULL };

static GSList *
empe_mp_signed_parse (EMailParserExtension *extension,
                      EMailParser *parser,
                      CamelMimePart *part,
                      GString *part_id,
                      GCancellable *cancellable)
{
    CamelMimePart *cpart;
    CamelMultipartSigned *mps;
    CamelCipherContext *cipher = NULL;
    CamelSession *session;
    guint32 validity_type;
    GSList *parts;
    CamelCipherValidity *valid;
    GError *local_error = NULL;
    gint i, nparts, len;
    gboolean secured;

    if (g_cancellable_is_cancelled (cancellable))
        return NULL;

    /* If the part is application/pgp-signature sub-part then skip it. */
    if (!CAMEL_IS_MULTIPART (part)) {
        CamelContentType *ct;
        ct = camel_mime_part_get_content_type (CAMEL_MIME_PART (part));
        if (camel_content_type_is (ct, "application", "pgp-signature")) {
            return g_slist_alloc ();
        }
    }

    mps = (CamelMultipartSigned *) camel_medium_get_content ((CamelMedium *) part);
    if (!CAMEL_IS_MULTIPART_SIGNED (mps)
        || (cpart = camel_multipart_get_part ((CamelMultipart *) mps,
        CAMEL_MULTIPART_SIGNED_CONTENT)) == NULL) {
        parts = e_mail_parser_error (
                parser, cancellable,
                _("Could not parse MIME message. "
                "Displaying as source."));

        parts = g_slist_concat (parts,
                e_mail_parser_parse_part_as (
                    parser, part, part_id,
                    "application/vnd.evolution.source",
                    cancellable));
        return parts;
    }

    session = e_mail_parser_get_session (parser);
    /* FIXME: Should be done via a plugin interface */
    /* FIXME: duplicated in em-format-html-display.c */
    if (mps->protocol) {
#ifdef ENABLE_SMIME
        if (g_ascii_strcasecmp ("application/x-pkcs7-signature", mps->protocol) == 0
            || g_ascii_strcasecmp ("application/pkcs7-signature", mps->protocol) == 0) {
            cipher = camel_smime_context_new (session);
            validity_type = E_MAIL_PART_VALIDITY_SMIME;
        } else {
#endif
            if (g_ascii_strcasecmp ("application/pgp-signature", mps->protocol) == 0) {
                cipher = camel_gpg_context_new (session);
                validity_type = E_MAIL_PART_VALIDITY_PGP;
            }
#ifdef ENABLE_SMIME
        }
#endif
    }

    if (cipher == NULL) {
        parts = e_mail_parser_error (
                parser, cancellable,
                _("Unsupported signature format"));

        parts = g_slist_concat (parts,
                e_mail_parser_parse_part_as (
                    parser, part, part_id,
                    "multipart/mixed", cancellable));

        return parts;
    }

    valid = camel_cipher_context_verify_sync (
        cipher, part, cancellable, &local_error);
    if (valid == NULL) {
        parts = e_mail_parser_error (
                parser, cancellable,
                _("Error verifying signature: %s"),
                local_error->message ?
                    local_error->message :
                    _("Unknown error"));

        g_clear_error (&local_error);

        parts = g_slist_concat (parts,
                e_mail_parser_parse_part_as (
                    parser, part, part_id,
                    "multipart/mixed", cancellable));

        g_object_unref (cipher);
        return parts;
    }

    nparts = camel_multipart_get_number (CAMEL_MULTIPART (mps));
    secured = FALSE;
    len = part_id->len;
    parts = NULL;
    for (i = 0; i < nparts; i++) {
        CamelMimePart *subpart;
        GSList *mail_parts, *iter;
        subpart = camel_multipart_get_part (CAMEL_MULTIPART (mps), i);

        g_string_append_printf (part_id, ".signed.%d", i);

        mail_parts = e_mail_parser_parse_part (
                parser, subpart, part_id, cancellable);

        g_string_truncate (part_id, len);

        if (!secured)
            secured = e_mail_part_is_secured (subpart);

        for (iter = mail_parts; iter; iter = iter->next) {
            EMailPart *mail_part;

            mail_part = iter->data;
            if (!mail_part)
                continue;

            e_mail_part_update_validity (mail_part, valid,
                validity_type | E_MAIL_PART_VALIDITY_SIGNED);
        }

        parts = g_slist_concat (parts, mail_parts);
    }

    /* Add a widget with details about the encryption, but only when
        * the encrypted isn't itself secured, in that case it has created
        * the button itself */
    if (!secured) {
        GSList *button;
        EMailPart *mail_part;
        g_string_append (part_id, ".signed.button");

        button = e_mail_parser_parse_part_as (
                parser, part, part_id,
                "application/vnd.evolution.widget.secure-button",
                cancellable);
        if (button && button->data) {
            mail_part = button->data;

            e_mail_part_update_validity (mail_part, valid,
                validity_type | E_MAIL_PART_VALIDITY_SIGNED);
        }

        parts = g_slist_concat (parts, button);

        g_string_truncate (part_id, len);
    }

    camel_cipher_validity_free (valid);

    g_object_unref (cipher);

    return parts;
}

static const gchar **
empe_mp_signed_mime_types (EMailExtension *extension)
{
    return parser_mime_types;
}

static void
e_mail_parser_multipart_signed_class_init (EMailParserMultipartSignedClass *class)
{
}

static void
e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface)
{
    iface->parse = empe_mp_signed_parse;
}

static void
e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface)
{
    iface->mime_types = empe_mp_signed_mime_types;
}

static void
e_mail_parser_multipart_signed_init (EMailParserMultipartSigned *parser)
{

}