420 lines
9.5 KiB
C
420 lines
9.5 KiB
C
/*
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* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
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* Copyright (C) 1999-2006 Hiroyuki Yamamoto & the Claws Mail team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <glib.h>
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#include <glib/gi18n.h>
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#include "privacy.h"
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#include "procmime.h"
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static GSList *systems = NULL;
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static gchar *privacy_last_error = NULL;
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void privacy_set_error(const gchar *format, ...)
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{
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va_list args;
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gchar buf[BUFSIZ];
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va_start(args, format);
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g_vsnprintf(buf, BUFSIZ, format, args);
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va_end(args);
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g_free(privacy_last_error);
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privacy_last_error = g_strdup(buf);
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}
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static gchar tmp_privacy_error[BUFSIZ];
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void privacy_reset_error(void)
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{
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g_free(privacy_last_error);
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privacy_last_error = NULL;
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}
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gboolean privacy_peek_error(void)
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{
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return (privacy_last_error != NULL);
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}
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const gchar *privacy_get_error (void)
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{
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if (privacy_last_error) {
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strncpy2(tmp_privacy_error, privacy_last_error, BUFSIZ-1);
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privacy_reset_error();
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return tmp_privacy_error;
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} else {
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return _("Unknown error");
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}
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}
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PrivacySystem *privacy_data_get_system(PrivacyData *data)
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{
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/* Make sure the cached system is still registered */
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if (data->system && g_slist_find(systems, data->system))
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return data->system;
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else
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return NULL;
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}
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/**
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* Register a new Privacy System
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*
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* \param system The Privacy System that should be registered
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*/
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void privacy_register_system(PrivacySystem *system)
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{
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systems = g_slist_append(systems, system);
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}
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/**
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* Unregister a new Privacy System. The system must not be in
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* use anymore when it is unregistered.
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*
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* \param system The Privacy System that should be unregistered
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*/
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void privacy_unregister_system(PrivacySystem *system)
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{
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systems = g_slist_remove(systems, system);
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}
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/**
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* Free a PrivacyData of a PrivacySystem
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*
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* \param privacydata The data to free
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*/
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void privacy_free_privacydata(PrivacyData *privacydata)
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{
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PrivacySystem *system = NULL;
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g_return_if_fail(privacydata != NULL);
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system = privacy_data_get_system(privacydata);
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if (!system)
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return;
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system->free_privacydata(privacydata);
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}
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/**
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* Check if a MimeInfo is signed with one of the available
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* privacy system. If a privacydata is set in the MimeInfo
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* it will directory return the return value by the system
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* set in the privacy data or check all available privacy
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* systems otherwise.
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*
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* \return True if the MimeInfo has a signature
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*/
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gboolean privacy_mimeinfo_is_signed(MimeInfo *mimeinfo)
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{
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GSList *cur;
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g_return_val_if_fail(mimeinfo != NULL, FALSE);
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if (mimeinfo->privacy != NULL) {
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PrivacySystem *system =
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privacy_data_get_system(mimeinfo->privacy);
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if (system == NULL) {
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mimeinfo->privacy = NULL;
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goto try_others;
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}
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if (system->is_signed != NULL)
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return system->is_signed(mimeinfo);
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else
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return FALSE;
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}
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try_others:
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for(cur = systems; cur != NULL; cur = g_slist_next(cur)) {
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PrivacySystem *system = (PrivacySystem *) cur->data;
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if(system->is_signed != NULL && system->is_signed(mimeinfo))
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Check the signature of a MimeInfo. privacy_mimeinfo_is_signed
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* should be called before otherwise it is done by this function.
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* If the MimeInfo is not signed an error code will be returned.
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*
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* \return Error code indicating the result of the check,
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* < 0 if an error occured
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*/
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gint privacy_mimeinfo_check_signature(MimeInfo *mimeinfo)
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{
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PrivacySystem *system;
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g_return_val_if_fail(mimeinfo != NULL, -1);
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if (mimeinfo->privacy == NULL)
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privacy_mimeinfo_is_signed(mimeinfo);
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if (mimeinfo->privacy == NULL)
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return -1;
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system = privacy_data_get_system(mimeinfo->privacy);
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if (system == NULL)
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return -1;
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if (system->check_signature == NULL)
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return -1;
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return system->check_signature(mimeinfo);
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}
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SignatureStatus privacy_mimeinfo_get_sig_status(MimeInfo *mimeinfo)
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{
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PrivacySystem *system;
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g_return_val_if_fail(mimeinfo != NULL, -1);
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if (mimeinfo->privacy == NULL)
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privacy_mimeinfo_is_signed(mimeinfo);
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if (mimeinfo->privacy == NULL)
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return SIGNATURE_UNCHECKED;
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system = privacy_data_get_system(mimeinfo->privacy);
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if (system == NULL)
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return SIGNATURE_UNCHECKED;
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if (system->get_sig_status == NULL)
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return SIGNATURE_UNCHECKED;
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return system->get_sig_status(mimeinfo);
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}
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gchar *privacy_mimeinfo_sig_info_short(MimeInfo *mimeinfo)
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{
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PrivacySystem *system;
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g_return_val_if_fail(mimeinfo != NULL, NULL);
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if (mimeinfo->privacy == NULL)
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privacy_mimeinfo_is_signed(mimeinfo);
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if (mimeinfo->privacy == NULL)
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return g_strdup(_("No signature found"));
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system = privacy_data_get_system(mimeinfo->privacy);
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if (system == NULL)
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return g_strdup(_("No signature found"));
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if (system->get_sig_info_short == NULL)
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return g_strdup(_("No information available"));
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return system->get_sig_info_short(mimeinfo);
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}
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gchar *privacy_mimeinfo_sig_info_full(MimeInfo *mimeinfo)
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{
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PrivacySystem *system;
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g_return_val_if_fail(mimeinfo != NULL, NULL);
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if (mimeinfo->privacy == NULL)
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privacy_mimeinfo_is_signed(mimeinfo);
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if (mimeinfo->privacy == NULL)
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return g_strdup(_("No signature found"));
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system = privacy_data_get_system(mimeinfo->privacy);
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if (system == NULL)
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return g_strdup(_("No signature found"));
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if (system->get_sig_info_full == NULL)
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return g_strdup(_("No information available"));
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return system->get_sig_info_full(mimeinfo);
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}
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gboolean privacy_mimeinfo_is_encrypted(MimeInfo *mimeinfo)
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{
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GSList *cur;
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g_return_val_if_fail(mimeinfo != NULL, FALSE);
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for(cur = systems; cur != NULL; cur = g_slist_next(cur)) {
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PrivacySystem *system = (PrivacySystem *) cur->data;
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if(system->is_encrypted != NULL && system->is_encrypted(mimeinfo))
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return TRUE;
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}
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return FALSE;
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}
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static gint decrypt(MimeInfo *mimeinfo, PrivacySystem *system)
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{
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MimeInfo *decryptedinfo, *parentinfo;
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gint childnumber;
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g_return_val_if_fail(system->decrypt != NULL, -1);
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decryptedinfo = system->decrypt(mimeinfo);
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if (decryptedinfo == NULL)
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return -1;
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parentinfo = procmime_mimeinfo_parent(mimeinfo);
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childnumber = g_node_child_index(parentinfo->node, mimeinfo);
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procmime_mimeinfo_free_all(mimeinfo);
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g_node_insert(parentinfo->node, childnumber, decryptedinfo->node);
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return 0;
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}
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gint privacy_mimeinfo_decrypt(MimeInfo *mimeinfo)
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{
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GSList *cur;
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g_return_val_if_fail(mimeinfo != NULL, FALSE);
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for(cur = systems; cur != NULL; cur = g_slist_next(cur)) {
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PrivacySystem *system = (PrivacySystem *) cur->data;
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if(system->is_encrypted != NULL && system->is_encrypted(mimeinfo))
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return decrypt(mimeinfo, system);
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}
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return -1;
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}
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GSList *privacy_get_system_ids()
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{
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GSList *cur;
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GSList *ret = NULL;
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for(cur = systems; cur != NULL; cur = g_slist_next(cur)) {
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PrivacySystem *system = (PrivacySystem *) cur->data;
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ret = g_slist_append(ret, g_strdup(system->id));
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}
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return ret;
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}
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static PrivacySystem *privacy_get_system(const gchar *id)
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{
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GSList *cur;
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g_return_val_if_fail(id != NULL, NULL);
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for(cur = systems; cur != NULL; cur = g_slist_next(cur)) {
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PrivacySystem *system = (PrivacySystem *) cur->data;
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if(strcmp(id, system->id) == 0)
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return system;
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}
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return NULL;
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}
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const gchar *privacy_system_get_name(const gchar *id)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, NULL);
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system = privacy_get_system(id);
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if (system == NULL)
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return NULL;
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return system->name;
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}
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gboolean privacy_system_can_sign(const gchar *id)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, FALSE);
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system = privacy_get_system(id);
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if (system == NULL)
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return FALSE;
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return system->can_sign;
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}
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gboolean privacy_system_can_encrypt(const gchar *id)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, FALSE);
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system = privacy_get_system(id);
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if (system == NULL)
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return FALSE;
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return system->can_encrypt;
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}
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gboolean privacy_sign(const gchar *id, MimeInfo *target, PrefsAccount *account)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, FALSE);
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g_return_val_if_fail(target != NULL, FALSE);
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system = privacy_get_system(id);
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if (system == NULL)
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return FALSE;
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if (!system->can_sign)
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return FALSE;
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if (system->sign == NULL)
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return FALSE;
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return system->sign(target, account);
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}
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gchar *privacy_get_encrypt_data(const gchar *id, GSList *recp_names)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, NULL);
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g_return_val_if_fail(recp_names != NULL, NULL);
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system = privacy_get_system(id);
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if (system == NULL)
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return NULL;
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if (!system->can_encrypt)
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return NULL;
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if (system->get_encrypt_data == NULL)
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return NULL;
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return system->get_encrypt_data(recp_names);
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}
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gboolean privacy_encrypt(const gchar *id, MimeInfo *mimeinfo, const gchar *encdata)
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{
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PrivacySystem *system;
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g_return_val_if_fail(id != NULL, FALSE);
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g_return_val_if_fail(mimeinfo != NULL, FALSE);
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if (encdata == NULL) {
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privacy_set_error(_("No recipient keys defined."));
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return FALSE;
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}
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system = privacy_get_system(id);
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if (system == NULL)
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return FALSE;
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if (!system->can_encrypt)
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return FALSE;
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if (system->encrypt == NULL)
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return FALSE;
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return system->encrypt(mimeinfo, encdata);
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}
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