path: root/em-format/e-mail-parser-application-smime.c

/*
 * e-mail-parser-application-xpkcs7mime.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 <string.h>
#include <glib/gi18n-lib.h>

#include <e-util/e-util.h>

#include "e-mail-parser-extension.h"
#include "e-mail-part-utils.h"

typedef EMailParserExtension EMailParserApplicationSMIME;
typedef EMailParserExtensionClass EMailParserApplicationSMIMEClass;

GType e_mail_parser_application_smime_get_type (void);

G_DEFINE_TYPE (
    EMailParserApplicationSMIME,
    e_mail_parser_application_smime,
    E_TYPE_MAIL_PARSER_EXTENSION)

static const gchar *parser_mime_types[] = {
    "application/xpkcs7mime",
    "application/x-pkcs7-mime",
    "application/pkcs7-mime",
    "application/pkcs7-signature",
    "application/xpkcs7-signature",
    "application/x-pkcs7-signature",
    NULL
};

static gboolean
empe_app_smime_parse (EMailParserExtension *extension,
                      EMailParser *parser,
                      CamelMimePart *part,
                      GString *part_id,
                      GCancellable *cancellable,
                      GQueue *out_mail_parts)
{
    CamelCipherContext *context;
    CamelMimePart *opart;
    CamelCipherValidity *valid;
    GError *local_error = NULL;
    CamelContentType *ct;

    ct = camel_mime_part_get_content_type (part);
    if (camel_content_type_is (ct, "application", "pkcs7-signature") ||
        camel_content_type_is (ct, "application", "xpkcs7-signature") ||
        camel_content_type_is (ct, "application", "x-pkcs7-signature")) {
        return TRUE;
    }

    context = camel_smime_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 (local_error != NULL) {
        e_mail_parser_error (
            parser, out_mail_parts,
            _("Could not parse S/MIME message: %s"),
            local_error->message);
        g_error_free (local_error);

    } else {
        GQueue work_queue = G_QUEUE_INIT;
        GList *head, *link;
        gint len = part_id->len;

        g_string_append (part_id, ".encrypted");

        e_mail_parser_parse_part (
            parser, opart, part_id, cancellable, &work_queue);

        g_string_truncate (part_id, len);

        head = g_queue_peek_head_link (&work_queue);

        /* Update validity flags of all the involved subp-arts */
        for (link = head; link != NULL; link = g_list_next (link)) {
            EMailPart *mail_part = link->data;

            e_mail_part_update_validity (
                mail_part, valid,
                E_MAIL_PART_VALIDITY_ENCRYPTED |
                E_MAIL_PART_VALIDITY_SMIME);
        }

        e_queue_transfer (&work_queue, out_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 (!e_mail_part_is_secured (opart)) {
            EMailPart *mail_part;

            g_string_append (part_id, ".encrypted.button");

            e_mail_parser_parse_part_as (
                parser, part, part_id,
                "application/vnd.evolution.widget.secure-button",
                cancellable, &work_queue);

            mail_part = g_queue_peek_head (&work_queue);

            if (mail_part != NULL)
                e_mail_part_update_validity (
                    mail_part, valid,
                    E_MAIL_PART_VALIDITY_ENCRYPTED |
                    E_MAIL_PART_VALIDITY_SMIME);

            e_queue_transfer (&work_queue, out_mail_parts);

            g_string_truncate (part_id, len);
        }

        camel_cipher_validity_free (valid);
    }

    g_object_unref (opart);
    g_object_unref (context);

    return TRUE;
}

static void
e_mail_parser_application_smime_class_init (EMailParserExtensionClass *class)
{
    class->mime_types = parser_mime_types;
    class->flags = E_MAIL_PARSER_EXTENSION_INLINE;
    class->parse = empe_app_smime_parse;
}

static void
e_mail_parser_application_smime_init (EMailParserExtension *extension)
{
}