diff options
Diffstat (limited to 'em-format/e-mail-parser-multipart-encrypted.c')
| -rw-r--r-- | em-format/e-mail-parser-multipart-encrypted.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/em-format/e-mail-parser-multipart-encrypted.c b/em-format/e-mail-parser-multipart-encrypted.c new file mode 100644 index 0000000000..f03588ac82 --- /dev/null +++ b/em-format/e-mail-parser-multipart-encrypted.c @@ -0,0 +1,220 @@ +/* + * 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 *klass) +{ + e_mail_parser_multipart_encrypted_parent_class = g_type_class_peek_parent (klass); +} + +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) +{ + +} |