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/*
* e-mail-parser-multipart-encrypted.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 _EMailParserMultipartEncrypted {
GObject parent;
} EMailParserMultipartEncrypted;
typedef struct _EMailParserMultipartEncryptedClass {
GObjectClass parent_class;
} EMailParserMultipartEncryptedClass;
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 (
EMailParserMultipartEncrypted,
e_mail_parser_multipart_encrypted,
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/encrypted", NULL };
static GSList *
empe_mp_encrypted_parse (EMailParserExtension *extension,
EMailParser *parser,
CamelMimePart *part,
GString *part_id,
GCancellable *cancellable)
{
CamelCipherContext *context;
const gchar *protocol;
CamelMimePart *opart;
CamelCipherValidity *valid;
CamelMultipartEncrypted *mpe;
GError *local_error = NULL;
GSList *parts;
gint len;
GSList *iter;
if (g_cancellable_is_cancelled (cancellable))
return NULL;
mpe = (CamelMultipartEncrypted *) camel_medium_get_content ((CamelMedium *) part);
if (!CAMEL_IS_MULTIPART_ENCRYPTED (mpe)) {
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;
}
/* Currently we only handle RFC2015-style PGP encryption. */
protocol = camel_content_type_param (
((CamelDataWrapper *)mpe)->mime_type, "protocol");
if (!protocol || g_ascii_strcasecmp (protocol, "application/pgp-encrypted") != 0) {
parts = e_mail_parser_error (
parser, cancellable,
_("Unsupported encryption type for multipart/encrypted"));
parts = g_slist_concat (
parts,
e_mail_parser_parse_part_as (
parser, part, part_id,
"multipart/mixed", cancellable));
return parts;
}
context = camel_gpg_context_new (e_mail_parser_get_session (parser));
opart = camel_mime_part_new ();
valid = camel_cipher_context_decrypt_sync (
context, part, opart, cancellable, &local_error);
e_mail_part_preserve_charset_in_content_type (part, opart);
if (valid == NULL) {
parts = e_mail_parser_error (
parser, cancellable,
_("Could not parse PGP/MIME message: %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 (opart);
g_object_unref (context);
return parts;
}
len = part_id->len;
g_string_append (part_id, ".encrypted");
parts = e_mail_parser_parse_part (
parser, opart, part_id, cancellable);
g_string_truncate (part_id, len);
/* Update validity of all encrypted sub-parts */
for (iter = parts; iter; iter = iter->next) {
EMailPart *mail_part;
mail_part = iter->data;
if (!mail_part)
continue;
e_mail_part_update_validity (mail_part, valid,
E_MAIL_PART_VALIDITY_ENCRYPTED |
E_MAIL_PART_VALIDITY_PGP);
}
/* Add a widget with details about the encryption, but only when
* the decrypted part isn't itself secured, in that case it has created
* the button itself */
if (!e_mail_part_is_secured (opart)) {
GSList *button;
EMailPart *mail_part;
g_string_append (part_id, ".encrypted.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,
E_MAIL_PART_VALIDITY_ENCRYPTED |
E_MAIL_PART_VALIDITY_PGP);
}
parts = g_slist_concat (parts, button);
g_string_truncate (part_id, len);
}
camel_cipher_validity_free (valid);
/* TODO: Make sure when we finalize this part, it is zero'd out */
g_object_unref (opart);
g_object_unref (context);
return parts;
}
static const gchar **
empe_mp_encrypted_mime_types (EMailExtension *extension)
{
return parser_mime_types;
}
static void
e_mail_parser_multipart_encrypted_class_init (EMailParserMultipartEncryptedClass *class)
{
}
static void
e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface)
{
iface->parse = empe_mp_encrypted_parse;
}
static void
e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface)
{
iface->mime_types = empe_mp_encrypted_mime_types;
}
static void
e_mail_parser_multipart_encrypted_init (EMailParserMultipartEncrypted *parser)
{
}
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